SMD resistors. SMD resistor markings, sizes, online calculator

Enter the resistor marking directly into the image of its body below and you will see the value of this SMD resistor below it. I also have a resistor color coding calculator on my website. The SMD resistor marking calculator accepts the following values:

• Three digits (123)
• Two digits separated by the letter R (4R7)
• Of four digits (1234)
• Three digits separated by the letter R (4R37)
• Designation from the EIA-96 table of two numbers and one Latin letter from the series “ZYRXSABHCDEF” (02A)

Resistor value:

Examples of resistor decodings

Resistors with two numbers and a separator (4R7 1R0 2R2)

In this case, "R" acts as a decimal point. Thus:

• 2R2 - 2.2 Ohm
• 1R0 - 1 Ohm
• 4R7 - 4.7 Ohm

Three-digit resistors (103 102 100)

For such resistors, the first two digits are the value, and the third digit indicates the number of zeros after the value.

• 100 — 10 Ohm
• 102 — 1,000 Ohm or 1 KOhm
• 103 — 10,000 Ohm or 10 KOhm

Four-digit resistors (0805 1206 2512)

As in previous examples, the first digits are directly the value, and the last digit indicates the number of zeros after the value:

• 0805 — 8,000,000 Ohm or 8 MOhm
• 1206 — 120,000,000 Ohm or 120 MOhm
• 2512 — 25 100 Ohm or 25.1 KOhm

Resistor 000

There are SMD resistors with zero resistance. They are designated by zeros (0, 00 or 000), or may have a longitudinal line on the body. Such resistors are often used as fuses. Since, despite almost zero resistance, they still have a certain power, which depends on the size of the resistor. I will write about this below.

Marking table for SMD constant resistance resistors

Code	Meaning	Code	Meaning	Code	Meaning	Code	Meaning
R10	0.1 Ohm	1R0	1 ohm	100	10 ohm	101	100 Ohm
R11	0.11 Ohm	1R1	1.1 Ohm	110	11 ohm	111	110 Ohm
R12	0.12 Ohm	1R2	1.2 Ohm	120	12 ohm	121	120 Ohm
R13	0.13 Ohm	1R3	1.3 Ohm	130	13 ohm	131	130 Ohm
R15	0.15 Ohm	1R5	1.5 Ohm	150	15 ohm	151	150 Ohm
R16	0.16 Ohm	1R6	1.6 Ohm	160	16 ohm	161	160 Ohm
R18	0.18 Ohm	1R8	1.8 Ohm	180	18 ohm	181	180 Ohm
R20	0.2 Ohm	2R0	2 ohm	200	20 ohm	201	200 Ohm
R22	0.22 Ohm	2R2	2.2 Ohm	220	22 Ohm	221	220 Ohm
R24	0.24 Ohm	2R4	2.4 Ohm	240	24 ohm	241	240 Ohm
R27	0.27 Ohm	2R7	2.7 Ohm	270	27 Ohm	271	270 Ohm
R30	0.3 ohm	3R0	3 ohm	300	30 ohm	301	300 Ohm
R33	0.33 Ohm	3R3	3.3 Ohm	330	33 Ohm	331	330 Ohm
R36	0.36 Ohm	3R6	3.6 Ohm	360	36 Ohm	361	360 Ohm
R39	0.39 Ohm	3R9	3.9 Ohm	390	39 Ohm	391	390 Ohm
R43	0.43 Ohm	4R3	4.3 Ohm	430	43 Ohm	431	430 Ohm
R47	0.47 Ohm	4R7	4.7 Ohm	470	47 Ohm	471	470 Ohm
R51	0.51 Ohm	5R1	5.1 Ohm	510	51 Ohm	511	510 Ohm
R56	0.56 Ohm	5R6	5.6 Ohm	560	56 Ohm	561	560 Ohm
R62	0.62 Ohm	6R2	6.2 Ohm	620	62 Ohm	621	620 Ohm
R68	0.68 Ohm	6R8	6.8 Ohm	680	68 Ohm	681	680 Ohm
R75	0.75 Ohm	7R5	7.5 Ohm	750	75 Ohm	751	750 Ohm
R82	0.82 Ohm	8R2	8.2 Ohm	820	82 Ohm	821	820 Ohm
R91	0.91 Ohm	9R1	9.1 Ohm	910	91 Ohm	911	910 Ohm
102	1 kOhm	103	10 kOhm	104	100 kOhm	105	1 mOhm
112	1.1 kOhm	113	11 kOhm	114	110 kOhm	115	1.1 mOhm
122	1.2 kOhm	123	12 kOhm	124	120 kOhm	125	1.2 mOhm
132	1.3 kOhm	133	13 kOhm	134	130 kOhm	135	1.3 mOhm
152	1.5 kOhm	153	15 kOhm	154	150 kOhm	155	1.5 mOhm
162	1.6 kOhm	163	16 kOhm	164	160 kOhm	165	1.6 mOhm
182	1.8 kOhm	183	18 kOhm	184	180 kOhm	185	1.8 mOhm
202	2 kOhm	203	20 kOhm	204	200 kOhm	205	2 mOhm
222	2.2 kOhm	223	22 kOhm	224	220 kOhm	225	2.2 mOhm
242	2.4 kOhm	243	24 kOhm	244	240 kOhm	245	2.4 mOhm
272	2.7 kOhm	273	27 kOhm	274	270 kOhm	275	2.7 mOhm
302	3 kOhm	303	30 kOhm	304	300 kOhm	305	3 mOhm
332	3.3 kOhm	333	33 kOhm	334	330 kOhm	335	3.3 mOhm
362	3.6 kOhm	363	36 kOhm	364	360 kOhm	365	3.6 mOhm
392	3.9 kOhm	393	39 kOhm	394	390 kOhm	395	3.9 mOhm
432	4.3 kOhm	433	43 kOhm	434	430 kOhm	435	4.3 mOhm
472	4.7 kOhm	473	47 kOhm	474	470 kOhm	475	4.7 mOhm
512	5.1 kOhm	513	51 kOhm	514	510 kOhm	515	5.1 mOhm
562	5.6 kOhm	563	56 kOhm	564	560 kOhm	565	5.6 mOhm
622	6.2 kOhm	623	62 kOhm	624	620 kOhm	625	6.2 mOhm
682	6.8 kOhm	683	68 kOhm	684	680 kOhm	685	6.8 mOhm
752	7.5 kOhm	753	75 kOhm	754	750 kOhm	755	7.5 mOhm
822	8.2 kOhm	823	82 kOhm	824	820 kOhm	815	8.2 mOhm
912	9.1 kOhm	913	91 kOhm	914	910 kOhm	915	9.1 mOhm

You can always buy SMD resistors inexpensively and without unnecessary hassles on Aliexpress, but you need to pay attention to reviews, since there is always a risk of ending up with an unscrupulous seller.

What is an SMD resistor - internal structure

This device consists of a ceramic substrate coated with a resistive layer of a certain material and contact pads, as well as a protective coating (polymer, resin, glass). The layer resistance depends on the type of material and its thickness. Various constituent elements can be made of chromium, nickel, tin, ruthenium, silver or palladium oxides, as well as various alloys.

The design of the SMD resistor includes:

• A substrate made of a dielectric with good thermal conductivity – aluminum oxide.
• The resistive layer is a thin metal (chromium) or oxide film (ruthenium oxide) up to 10 microns thick. The material of the resistive layer has a low TCR, which ensures stability of parameters when temperature changes and the ability to produce precision resistors. To produce parts with a nominal resistance of less than 100 ohms, constantan is used for the resistive layer. The resistive element determines most of the electrical properties of an SMD resistor.
• Contact areas. They are formed from several layers. The inner layer is made of precious metals - palladium or silver. The intermediate layer is nickel, the outer layer is lead-tin. The use of these materials ensures ideal connectivity of the layers, which determines the reliability of contacts and the noise level.

The composition of the resistive layer, the nature of its processing, and the technology of application to the substrate are most often the know-how of the manufacturer and are kept in the strictest confidence.

Color coding of resistors

On the one hand, the multi-colored stripes (or rings) present on the parts made the process of factory marking easier. On the other hand, this often confuses novice radio amateurs.

However, you can figure it out if you want. It is enough to understand the principle of color marking once and no further problems will arise.

Before you begin to “decipher” the resistor, you need to position it in front of your eyes so that the colored rings are located on the left side.

Please note: gold or silver stripes are usually not taken into account when decoding. We simply skip them.

Next it reads the number by stripes:

• 0 - black;
• 1- brown;
• 2 - Red;
• 3 - Orange;
• 4 - Yellow;
• 5 - Green;
• 6 - Blue;
• 7 - Purple;
• 8 - Gray;
• 9 - White.

The third colored stripe on the resistor is responsible for the number of zeros that need to be added to the resulting value. To do this, you will need a plate that contains the values ​​​​for each specific color.

The names and types of SMD resistor housings may vary. For example, the symbol in square brackets is used in accordance with the accepted standards of the JEDEC Engineering Standards Committee (USA), and the curly braces refer to JEITA (Japan).

Also, sometimes there may be designations enclosed in parentheses - this is how resistor cases are usually designated, which are accepted as a standard in a particular company.

2 outputs		3 pins		4 pins		5 pins		6 pins		>8 pins
smcj [do214ab] 7.0x6.0x2.6mm	d2pak [to263] 9.8x8.8x4.0mm	mbs [to269aa] 4.8x3.9x2.5mm	d2pak5 [to263-5] 9.8x8.8x4.0mm	mlp2x3 [mo229] (dfn2030-6) (lfcsp6) 3.0x2.0x0.75mm	tssop8 [mo153] 4.4x3.0x1.0mm
smbj [do214aa] 4.6x3.6x2.3mm	dpak [to252aa] 6.6x6.1x2.3mm	sop4 4.4x4.1x2.0mm	dpak5 [to252-5] 6.6x6.1x2.3mm	ssot6 [mo193] 3.0x1.7x1.1mm	chipfet 3.05x1.65x1.05mm
(gf1) [do214ba] 4.5x1.4x2.5mm	(smpc) [to277a] 6.5x4.6x1.1mm	ssop4 4.4x2.6x2.0mm	sot223-5 6.5x3.5x1.8mm	dfn2020-6 [sot1118] (wson6 | llp6) 2.0x2.0x0.75mm	tdfn8 (wson8) (lfcsp8) 3.0x3.0x0.9mm
smaj [do214ac] 4.5x2.6x2.0mm	sot223 [to261aa] {sc73} 6.5x3.5x1.8mm	sot223-4 6.5x3.5x1.8mm	mo240 (pqfn8l) 3.3x3.3x1.0mm	sot23-6 [mo178ab] {sc74} 2.9x1.6x1.1mm	(mlf8) 2.0x2.0x0.85mm
sod123 [do219ab] 2.6x1.6x1.1mm	sot89 [to243aa] {sc62} 4.7x2.5x1.7mm	sot143 2.9x1.3x1.0mm	sot89-5 4.5x2.5x1.5mm	tsot6 [mo193] 2.9x1.6x0.9mm	msop8 [mo187aa] 3.0x3.0x1.1mm
sod123f 2.6x1.6x1.1mm	sot23f 2.9x1.8x0.8mm	sot343 2.0x1.3x0.9mm	sot23-5 [mo193ab|mo178aa] {sc74a} (tsop5/sot753) 2.9x1.6x1.1mm	sot363 [mo203ab|ttsop6] {sc88|sc70-6} (us6) 2.0x1.25x1.1mm	vssop8 3.0x3.0x0.75mm
sod110 2.0x1.3x1.6mm	sot346 [to236aa] {sc59a} (smini) 2.9x1.5x1.1mm	sot543 1.6x1.2x0.5mm	sct595 2.9x1.6x1.0mm	sot563f {sc89-6|sc170c} [sot666] 1.6x1.2x0.6mm	sot23-8 2.9x1.6x1.1mm
sod323 {sc76} 1.7x1.25x0.9mm	sot23 [to236ab] 2.9x1.3x1.0mm	(tsfp4-1) 1.4x0.8x0.55mm	sot353 [mo203aa] {sc88a|sc70-5} (tssop5) 2.0x1.25x0.95mm	sot886 [mo252] (xson6/mp6c) 1.45x1.0x0.55mm	sot765 [mo187ca] (us8) 2.0x2.3x0.7mm
sod323f {sc90a} 1.7x1.25x0.9mm	dfn2020 (sot1061) 2.0x2.0x0.65mm	(tslp4) 1.2x0.8x0.4mm	sot553 (sot665|esv) {sc107} 1.6x1.2x0.6mm	wlcsp6 1.2x0.8x0.4mm	usoic10 (rm10|micro10) 3.0x3.0x1.1mm

dfn1608 (sod1608) 1.6x0.8x0.4mmsot323 {sc70} (usm) 2.0x1.25x0.9mmdfn4 1.0x1.0x0.6mmsot1226 (x2son5) 0.8x0.8x0.35mmtdfn10 (vson10|dfn10) 3.0x3.0x0.9mmsod523f {sc79} 1.2x0.8x0.6mmsot523 (sot416) {sc75a} 1.6x0.8x0.7mm(dsbga4|wlcsp) 0.75x0.75x0.63mm(wson10) 3.0x3.0x0.8mmsod822 (tslp2) 1.0x0.6x0.45mmsot523f (sot490) {sc89-3} 1.6x0.8x0.7mmmsop10 [mo187da] 2.9x2.5x1.1mmdfn1412 {sot8009} 1.4x1.2x0.5mm(uqfn10) 1.8x1.4x0.5mmsot723 {sc105aa} (tsfp-3) 1.2x0.8x0.5mmbga9 (9pin flip-chip) 1.45x1.45x0.6mmdfn1110 {mo340ba} (sot8015) 1.1x1.0x0.5mmsot883 {sc101} (tslp3-1) 1.0x0.6x0.5mmsot1123 0.8x0.6x0.37mm

Characteristics

These miniature resistors are perfect for surface mounting. Marking allows you to find out the size, power and resistance of the product.

The shape of SMD resistors is rectangular, square, round, oval, the profile is low. Low-profile elements are placed on the board very compactly and significantly save usable space.

SMD resistors are classified according to a number of parameters, such as:

• Nominal resistance
  . This value is measured under certain environmental parameters, the most important of which is temperature. Usually the nominal resistance is considered to be measured at a temperature of +20 °C and normal atmospheric pressure.
• Tolerance on nominal resistance
  . Possible tolerances are from 0.05 to +5%. The most popular and affordable parts with tolerances of +/-1% and +/-5%. More accurate models must be pre-ordered, and they are much more expensive than less accurate analogues.
• Temperature coefficient of resistance change (TCC)
  . This parameter characterizes the reversible relative change in the resistance of the part when the temperature fluctuates by 1 °C. Temperature changes in the part are possible due to changes in ambient temperature or self-heating of the resistor. The unit of measurement for this value is ppm. Modern SMD resistors are produced with TCR, the value of which is in the range of +/-5...+/-200 ppm. If parts from the same manufacturer are used to create a circuit, then the values ​​of their nominal resistances and TCR are closer to each other than is reflected in the passport for each part. Therefore, using parts from the same manufacturer allows you to improve the accuracy of the circuit both at a constant temperature and when it changes.
• Power dissipation
  . This parameter depends on the size and is determined from the table.

Dimensions of SMD parts housings

SMD resistors

TYPE:	Type Explanation:
S.R.	Resistor Chip Resistor chip
Size (inches)	Size(mm)	Component Thickness	Tape width	Component pitch in the ribbon	Quantity in standard packaging (180 mm/7 inches) paper tape	Qty per standard package (180 mm/7 inches) plastic tape
01005	0402	0.12 mm ± 0.02	8 mm	2 mm	20000	–
0201	0603	0.23 mm ± 0.03	8 mm	2 mm	15000	–
0402	1005	0.35 mm ± 0.05	8 mm	2 mm	10000	–
0603	1608	0.45 mm ± 0.1	8 mm	4 mm	5000	–
0805	2012	0.55 mm ± 0.1	8 mm	4 mm	5000	–
1206	3216	0.55 mm ± 0.15	8 mm	4 mm	5000	–
1210	3225	0.55 mm ± 0.15	8 mm	4 mm	5000	4000
2010	5025	0.55 mm ± 0.15	8/12 mm	4/8 mm	–	4000
2512	6332	0.55 mm ± 0.15	12 mm	4/8 mm	–	4000/2000

TYPE:	Type Explanation:
SRM	Melf Resistor Melf resistor (round)
Size (inches)	Name	Component size	Tape width	Component pitch in the ribbon	Qty per standard package (180 mm/7 inches) plastic tape
0604	–	1.6 mm X 1.0 mm	8 mm	4 mm	3000
0805	Micro	2.2 mm X 1.1 mm	8 mm	4 mm	3000
1206	Mini	3.2 mm X 1.6 mm	8 mm	4 mm	3000
1406	Mini	3.5 mm X 1.4 mm	8 mm	4 mm	3000
2308	Melf	5.9 mm X 2.2 mm	12 mm	4 mm	1500

SMD capacitors

TYPE:	Type Explanation:
S.C.	Ceramic Chip Capacitor Ceramic chip capacitor
Size (inches)	Size(mm)	Component Thickness	Tape width	Component pitch in the ribbon	Quantity in standard packaging (180 mm/7 inches) paper tape	Qty per standard package (180 mm/7 inches) plastic tape
01005	0402	0.2 mm ± 0.03	8 mm	2 mm	20000	–
0201	0603	0.3 mm ± 0.03	8 mm	2 mm	15000	–
0402	1005	0.5 mm ± 0.1	8 mm	2 mm	10000	–
0603	1608	0.8 mm ± 0.1	8 mm	4 mm	4000	–
0805	2012	0.6 – 1.25 mm	8 mm	4 mm	4000	3000
1206	3216	0.6 – 1.25 mm	8 mm	4 mm	4000	3000
1210	3225	1.25 mm – 1.5 mm	8 mm	4 mm	–	3000
1812	4532	2 mm (Max.)	12 mm	8 mm	–	1000
2225	5664	2 mm (Max.)	12 mm	8 mm	–	1000

Tantalum capacitors SMD

TYPE:	Type Explanation:
SD	Molded Tantalum Tantalum capacitor (polar component)
Size (inches)	Code	Component Thickness	Component size	Tape width	Component pitch in the ribbon	Qty per standard package (180 mm/7 inches) plastic tape
3216	A	1.6 mm	3.2 mm X 1.6 mm	8 mm	4 mm	2000
3528	B	1.9 mm	3.5 mm X 2.8 mm	8 mm	4 mm	2000
6032	C	2.5 mm	6.0 mm X 3.2 mm	12 mm	8 mm	500
7343	D	2.8 mm	7.3 mm X 4.3 mm	12 mm	8 mm	500
1608	J	0.8 mm	1.6 mm X 0.8 mm	8 mm	4 mm	4000
2012	P/R	1.2 mm	2.0 mm X 1.2 mm	8 mm	4 mm	2500/3000

Electrolytic capacitors SMD

TYPE:	Type Explanation:
S.E.	Aluminum Capacitor Aluminum capacitor (polar component)
Case diameter	Case height	Tape width	Component pitch in the ribbon	Qty per standard package (180 mm/7 inches) plastic tape	Qty per standard pack (330 mm/13 inches) plastic tape
3 mm	5.5 mm	12 mm	8 mm	100	2000
4 mm	5.5 mm	12 mm	8 mm	100	2000
5 mm	5.5 mm	12 mm	12 mm	100	1000
6.3 mm	5.5 mm	16 mm	12 mm	100	1000
8 mm	6 mm	16 mm	12 mm	100	1000
8 mm	10 mm	24 mm	16 mm	100	500
10 mm	10 mm	24 mm	16 mm	100	300 – 500
10 mm	14 – 22 mm	32 mm	20 mm	–	250 – 300
12.5 mm	14 mm	32 mm	24 mm	–	200 – 250
12.5 mm	17 mm	32 mm	24 mm	–	150 – 200
12.5 mm	22 mm	32 mm	24 mm	–	125 – 150
16 mm	17 mm	44 mm	28 mm	–	125 – 150
16 mm	22 mm	44 mm	28 mm	–	75 – 100
18 mm	17 mm	44 mm	32 mm	–	125 – 150
18 mm	22 mm	44 mm	32 mm	–	75 – 100
20 mm	17 mm	44 mm	36 mm	–	50

SMD transistors

TYPE:	Type Explanation:
SOT	SOT Transistor SOT transistor
Type of shell	Number of pins	Tape width	Component pitch in the ribbon	Case size A (mm)	Case size B (mm)	Case size S (mm)	Case height H (mm)	Qty per standard package (180 mm/7 inches) plastic tape
SOT723	3	8 mm	4 mm	1.2	0.8	1.2	0.5	8000
SOT346	3	8 mm	4 mm	2.9	1.6	2.8	1.1	3000
SOT323	3	8 mm	4 mm	2.0	1.25	2.1	0.9	3000
SOT416	3	8 mm	4 mm	1.6	0.8	1.6	0.7	3000
SOT523F	3	8 mm	4 mm	1.6	0.8	1.6	0.7	3000
SOT23	3	8 mm	4 mm	2.9	1.3	2.4	0.95	3000
SOT23-5	5	8 mm	4 mm	2.9	1.6	2.8	1.1	3000
SOT23-6	6	8 mm	4 mm	2.9	1.6	2.8	1.1	3000
SOT89	3	12 mm	8 mm	4.5	2.5	4.0	1.5	1000
SOT143	4	8 mm	4 mm	2.9	1.6	2.8	0.95	3000
SOT223	3	16 mm	8 mm	6.5	3.6	7.0	1.6	2500
SOT323	3	8 mm	4 mm	2.0	1.25	2.1	0.9	3000
SOT343	4	8 mm	4 mm	2.0	1.25	2.1	0.9	3000
SOT353	5	8 mm	4 mm	2.0	1.25	2.1	0.9	3000
SOT363	6	8 mm	4 mm	2.0	1.25	2.1	0.9	3000
SOT23-8	8	8 mm	4 mm	2.9	1.6	2.9	1.2	3000

Power transistors SMD

TYPE:	Type Explanation:
DPAK	DPAK Transistor DPAK Transistor
Type of shell	Number of pins	Tape width	Component pitch in the ribbon	Case size L (mm)	Case size W (mm)	Case height H (mm)	Case size S (mm)	Qty per standard pack (330 mm/13 inches) plastic tape
DPAK	3	16 mm	8 mm	6	6.5	2.3	10	2500
D2PAK	3	24 mm	16 mm	9.2	10	4.4	15	500 – 800
D2PAK-5	5	24 mm	16 mm	9.2	10	4.4	15	500 – 800
D2PAK-7	7	24 mm	16 mm	9.2	10	4.4	15	500 – 800
D3PAK	3	24 mm	24 mm	14	16	4.7	18.8	500

MELF SMD diodes

TYPE:	Type Explanation:
SOD	SOD, SM, Melf Diode/Rectifier SOD, SM, Melf diodes (round)
Component type	Component size (diameter X length)	Tape width	Component pitch in the ribbon	Qty per standard package (180 mm/7 inches) plastic tape
MiniMELF/SOD-80 (LL34)	1.6 mm X 3.5 mm	8 mm	4 mm	2500
MELF (LL35/LL41)	2.5 mm X 5.0 mm	12 mm	4 mm	1500
MELF (SM1)	2.5 mm X 5.0 mm	12 mm	4 mm	1750

SOD SMD diodes

TYPE:	Type Explanation:
S.M.	Rectangular Diode Gull Wing Lead
Type of shell	Tape width	Component pitch in the ribbon	Case size L (mm)	Case size W (mm)	Case height H (mm)	Case size S (mm)	Case size B (mm)	Qty per standard package (170 mm/7 inches) plastic tape
SOD923	8 mm	2 mm	0.8	0.6	0.4	1.0	0.2	8000
SOD723	8 mm	2 mm	1.0	0.6	0.5	1.4	0.3	8000
SOD523	8 mm	4 mm	1.2	0.8	0.6	1.6	0.3	3000
SOD323	8 mm	4 mm	1.7	1.25	0.7	2.5	0.3	3000
SOD123	8 mm	4 mm	2.7	1.5	1.3	3.6	0.7	3000
DO215AC	12 mm	4 mm	4.3	2.6	2.2	6.1	1.4	1800
DO215AA	12 mm	8 mm	4.3	3.6	2.3	6.2	2.0	1000
DO215AB	16 mm	8 mm	7.0	6.0	2.3	1 0	3.0	900

SM SMD Diodes

TYPE:	Type Explanation:
S.M.	Rectangular Diode C-Bend Lead (Modified J-Lead)
Type of shell	Tape width	Component pitch in the ribbon	Case size L (mm)	Case size W (mm)	Case height H (mm)	Case size S (mm)	Case size B (mm)	Qty per standard package (170 mm/7 inches) plastic tape
S.M.A.J.	12 mm	4 mm	4.3	2.6	2.2	5.0	1.5	1800
SMBJ	12 mm	8 mm	4.3	3.6	2.3	5.4	2.0	750
SMCJ	16 mm	8 mm	7.0	6.0	2.3	8.0	3.0	850

Surface Mount Technology of SMD Resistors

Installation of surface resistors in amateur workshops is carried out using a hair dryer, and in production conditions it occurs in special ovens.

Stages of mounting parts on a board in serial and mass production:

• Small spacers made of silver or gold, lead-tin plates are placed on the board, on which SMD components will be fixed.
• Using the machine, solder paste and a mixture consisting of flux and solder are applied to the prepared mounting pads.
• After preparing the printed circuit board, components are fed into the device (Pick machine) in trays, on rolls of tape or in tubes. The machines then place them on the board. Equipment productivity can reach 60,000 elements per hour.
• The assembled board enters the oven at a temperature sufficient to melt the solder.
• After removal from the oven, the boards are cooled and cleared of loose solder particles.

Quality is checked by visual inspection, during which missing parts and the degree of cleaning are determined.

The development and implementation of surface mount technology (SMT) has made it possible to automate the board assembly process and make it faster, simpler, cheaper and more efficient. In practice, a hybrid of surface-mount and through-hole mounting technologies may be encountered.

The use of surface-mount resistors has a positive effect on the weight and size of radio-electronic devices and their frequency parameters.

Coding table for planar SMD parts

The first 2 characters of the chip element are indicated. By clicking on them you will be taken to a page with another table, which shows various options for the remaining symbols with a brief description of the functions and parameters for each.

00

01

02

03

04

05

06

07

08

09

0A

0B

0C

0D

0E

0F

0G

0H

0I

0J

0K

0L

0M

0N

0P

0Q

0R

0S

0T

0U

0V

0W

0X

0Y

0Z

10

11

12

13

14

15

16

17

18

19

1A

1B

1C

1D

1E

1F

1G

1H

1I

1J

1K

1L

1M

1N

1P

1Q

1R

1S

1T

1U

1V

1W

1X

1Y

1Z

20

21

22

23

24

25

26

27

28

29

2A

2B

2C

2D

2E

2F

2G

2H

2I

2J

2K

2L

2M

2N

2P

2Q

2R

2S

2T

2U

2V

2W

2X

2Y

2Z

30

31

32

33

34

35

36

37

38

39

3A

3B

3C

3D

3E

3F

3G

3H

3I

3J

3K

3L

3M

3N

3P

3Q

3R

3S

3T

3U

3V

3W

3X

3Y

3Z

40

41

42

43

44

45

46

47

48

49

4A

4B

4C

4D

4E

4F

4G

4H

4I

4J

4K

4L

4M

4N

4P

4Q

4R

4S

4T

4U

4V

4W

4X

4Y

4Z

50

51

52

53

54

55

56

57

58

59

5A

5B

5C

5D

5E

5F

5G

5H

5I

5J

5K

5L

5M

5N

5P

5Q

5R

5S

5T

5U

5V

5W

5X

5Y

5Z

60

61

62

63

64

65

66

67

68

69

6A

6B

6C

6D

6E

6F

6G

6H

6I

6J

6K

6L

6M

6N

6P

6Q

6R

6S

6T

6U

6V

6W

6X

6Y

6Z

70

71

72

73

74

75

76

77

78

79

7A

7B

7C

7D

7E

7F

7G

7H

7I

7J

7K

7L

7M

7N

7P

7Q

7R

7S

7T

7U

7V

7W

7X

7Y

7Z

80

81

82

83

84

85

86

87

88

89

8A

8B

8C

8D

8E

8F

8G

8H

8I

8J

8K

8L

8M

8N

8P

8Q

8R

8S

8T

8U

8V

8W

8X

8Y

8Z

90

91

92

93

94

95

96

97

98

99

9A

9B

9C

9D

9E

9F

9G

9H

9I

9J

9K

9L

9M

9N

9P

9Q

9R

9S

9T

9U

9V

9W

9X

9Y

9Z

A0

A1

A2

A3

A4

A5

A6

A7

A8

A9

A.A.

AB

A.C.

AD

A.E.

A.F.

A.G.

A.H.

A.I.

A.J.

A.K.

AL

A.M.

AN

AP

AQ

AR

AS

AT

AU

AV

A.W.

AX

AY

AZ

B0

B1

B2

B3

B4

B5

B6

B7

B8

B9

B.A.

BB

B.C.

BD

BE

B.F.

B.G.

B.H.

B.I.

B.J.

B.K.

B.L.

B.M.

BN

B.P.

BQ

BR

B.S.

BT

B.U.

B.V.

B.W.

BX

BY

BZ

C0

C1

C2

C3

C4

C5

C6

C7

C8

C9

C.A.

C.B.

CC

CD

C.E.

CF

C.G.

CH

C.I.

C.J.

CK

C.L.

C.M.

CN

C.P.

C.Q.

CR

C.S.

C.T.

C.U.

CV

CW

CX

C.Y.

CZ

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

D.A.

D.B.

DC

DD

DE

DF

DG

D.H.

D.I.

DJ

DK

D.L.

DM

DN

D.P.

DQ

D.R.

D.S.

D.T.

D.U.

D.V.

DW

DX

DY

DZ

E0

E1

E2

E3

E4

E5

E6

E7

E8

E9

E.A.

E.B.

E.C.

ED

E.E.

E.F.

E.G.

E.H.

EI

EJ

E.K.

EL

E.M.

EN

E.P.

EQ

ER

ES

ET

EU

EV

E.W.

EX

EY

EZ

F0

F1

F2

F3

F4

F5

F6

F7

F8

F9

F.A.

FB

F.C.

FD

F.E.

FF

FG

FH

FI

F.J.

FK

FL

FM

FN

FP

FQ

FR

FS

F.T.

F.U.

F.V.

FW

FX

FY

FZ

G0

G1

G2

G3

G4

G5

G6

G7

G8

G9

GA

G.B.

G.C.

G.D.

G.E.

GF

GG

G.H.

G.I.

G.J.

GK

G.L.

G.M.

GN

G.P.

GQ

GR

G.S.

GT

G.U.

G.V.

G.W.

GX

G.Y.

GZ

H0

H1

H2

H3

H4

H5

H6

H7

H8

H9

H.A.

HB

HC

HD

HE

HF

HG

HH

HI

H.J.

H.K.

H.L.

H.M.

HN

HP

HQ

HR

H.S.

HT

HU

H.V.

HW

HX

HY

HZ

I0

I1

I2

I3

I4

I5

I6

I7

I8

I9

I.A.

I.B.

IC

ID

I.E.

IF

I.G.

IH

II

IJ

IK

IL

I.M.

IN

IP

IQ

IR

IS

IT

IU

IV

IW

IX

IY

IZ

J0

J1

J2

J3

J4

J5

J6

J7

J8

J9

JA

JB

JC

JD

JE

JF

JG

JH

JI

JJ

JK

JL

J.M.

JN

J.P.

J.Q.

JR

JS

JT

J.U.

JV

JW

JX

JY

JZ

K0

K1

K2

K3

K4

K5

K6

K7

K8

K9

K.A.

K.B.

KC

KD

KE

KF

KG

KH

KI

KJ

KK

KL

K.M.

KN

KP

KQ

KR

KS

KT

KU

KV

KW

KX

KY

KZ

L0

L1

L2

L3

L4

L5

L6

L7

L8

L9

L.A.

LB

L.C.

LD

L.E.

LF

LG

L.H.

LI

L.J.

L.K.

LL

L.M.

LN

LP

L.Q.

LR

L.S.

LT

L.U.

LV

LW

LX

LY

LZ

M0

M1

M2

M3

M4

M5

M6

M7

M8

M9

M.A.

M.B.

M.C.

M.D.

M.E.

M.F.

MG

M.H.

MI

MJ

MK

M.L.

MM

MN

MP

MQ

M.R.

MS

M.T.

M.U.

MV

M.W.

MX

M.Y.

MZ

N0

N1

N2

N3

N4

N5

N6

N7

N8

N9

N.A.

N.B.

NC

ND

NE

NF

NG

N.H.

NI

NJ

N.K.

NL

N.M.

NN

NP

N.Q.

NR

N.S.

NT

NU

N.V.

NW

NX

NY

NZ

P0

P1

P2

P3

P4

P5

P6

P7

P8

P9

PA

P.B.

PC

P.D.

P.E.

PF

PG

PH

P.I.

P.J.

PK

P.L.

P.M.

PN

PP

PQ

PR

PS

P.T.

P.U.

PV

PW

PX

PY

PZ

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Q8

Q9

QA

QB

QC

QD

QE

QF

QG

QH

QI

Q.J.

QK

QL

QM

QN

QP

QQ

QR

QS

QT

QU

QV

QW

QX

QY

QZ

R0

R1

R2

R3

R4

R5

R6

R7

R8

R9

R.A.

R.B.

R.C.

R.D.

RE

RF

RG

RH

R.I.

R.J.

RK

R.L.

R.M.

RN

R.P.

RQ

R.R.

R.S.

RT

RU

RV

RW

RX

R.Y.

RZ

S0

S1

S2

S3

S4

S5

S6

S7

S8

S9

S.A.

S.B.

S.C.

SD

S.E.

SF

S.G.

SH

S.I.

S.J.

S.K.

SL

S.M.

SN

SP

S.Q.

S.R.

SS

ST

S.U.

SV

S.W.

SX

S.Y.

SZ

T0

T1

T2

T3

T4

T5

T6

T7

T8

T9

T.A.

TB

TC

T.D.

T.E.

TF

TG

T.H.

T.I.

T.J.

TK

TL

TM

TN

TP

T.Q.

TR

T.S.

TT

T.U.

TV

TW

TX

T.Y.

TZ

U0

U1

U2

U3

U4

U5

U6

U7

U8

U9

U.A.

UB

U.C.

UD

UE

U.F.

U.G.

UH

UI

U.J.

UK

UL

U.M.

UN

U.P.

UQ

UR

US

UT

UU

UV

U.W.

UX

UY

UZ

V0

V1

V2

V3

V4

V5

V6

V7

V8

V9

V.A.

VB

V.C.

V.D.

V.E.

VF

VG

VH

VI

V.J.

VK

VL

V.M.

VN

V.P.

VQ

VR

VS

VT

VU

V.V.

VW

VX

VY

VZ

W0

W1

W2

W3

W4

W5

W6

W7

W8

W9

W.A.

W.B.

W.C.

W.D.

WE

W.F.

W.G.

W.H.

WI

W.J.

W.K.

W.L.

W.M.

WN

W.P.

W.Q.

WR

W.S.

W.T.

W.U.

W.V.

WW

W.X.

W.Y.

WZ

X0

X1

X2

X3

X4

X5

X6

X7

X8

X9

XA

XB

XC

XD

XE

XF

XG

XH

XI

XJ

XK

XL

XM

XN

XP

XQ

XR

XS

XT

XU

XV

XW

XX

XY

XZ

Y0

Y1

Y2

Y3

Y4

Y5

Y6

Y7

Y8

Y9

YA

YB

YC

YD

YE

YF

YG

YH

YI

YJ

YK

YL

YM

YN

YP

YQ

YR

YS

YT

YU

YV

YW

YX

YY

YZ

Z0

Z1

Z2

Z3

Z4

Z5

Z6

Z7

Z8

Z9

ZA

ZB

ZC

ZD

ZE

ZF

ZG

ZH

ZI

ZJ

ZK

ZL

ZM

ZN

ZP

ZQ

ZR

ZS

ZT

ZU

ZV

ZW

ZX

ZY

ZZ

Three-digit resistor numbering with 1% tolerance

Resistors with a tolerance of 1% of size 0603 are marked using three-digit numbering. The first two characters are numbers indicating the resistance value in Ohms, taken from the table below. The last character is a letter indicating the value of the multiplier: S=0.1; R=1; B=10; C=100; D=1000; E=10000; F=100000. For example, the marking 28C means that the resistor has a value of 191 × 100 ohms = 19.1 kOhms.

= 19.1 KOhm

Code	Meaning	Code	Meaning	Code	Meaning	Code	Meaning
01	100	25	178	49	316	73	562
02	102	26	182	50	326	74	576
03	105	27	187	51	332	75	590
04	107	28	191	52	340	76	604
05	110	29	196	53	348	77	619
06	113	30	200	54	357	78	634
07	115	31	205	55	365	79	649
08	118	32	210	56	374	80	665
09	121	33	215	57	383	81	681
10	124	34	221	58	392	82	698
11	127	35	226	59	402	83	715
12	130	36	232	60	412	84	732
13	133	37	237	61	422	85	750
14	137	38	243	62	432	86	768
15	140	39	249	63	442	87	787
16	143	40	255	64	453	88	806
17	147	41	261	65	464	89	825
18	150	42	267	66	475	90	845
19	154	43	274	67	487	91	866
20	158	44	280	68	499	92	887
21	162	45	287	69	511	93	909
22	165	46	294	70	523	94	931
23	169	47	301	71	536	95	953
24	174	48	309	72	549	96	976

Online calculator for color resistor markings

Due to the miniature size of low-power resistors and to facilitate readability, color markings of resistors were introduced, applied to them in the form of 3, 4 or 5 stripes (rings). To use the calculator, the resistor must be placed in such a way that the strip closest to the resistor terminal is on the left or the widest strip, which is always the first when determining the value, is placed on the left.

The resistance value is always determined by the first three bands. The first two stripes of marking are numbers, and the third is the multiplier. The fourth ring shows the permissible error in resistance accuracy from the nominal value of the resistor.

Resistors with an accuracy of up to 20% are marked with three rings, with an accuracy of 10% and 5% - with four, for all other more accurate ones, markings with five or six rings are used.

To determine the resistor value using our online calculator, you need to select the colors of all rings - the program will automatically determine and display the value.

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Ring 1

Ring 1

Ring 2

Factor

Tolerance in %

2W resistors with a resistance of less than 0.01 Ohm

	0.001Ω ± 1%	±50 ppm/°C	2 W	LR2512-22 R001 F2
2512	0.005Ω ± 1%	±25 ppm/°C	2 W	LR2512-22 R005 F4
2512	0.01Ω ± 1%	±15 ppm/°C	2 W	LR2512-22 R010 F2
2512	0.025Ω ± 2%	±15 ppm/°C	2 W	LR2512-FMF25GPJR025
2512	0.05Ω ± 1%	±15 ppm/°C	2 W	LR2512-22 R050 F4

Prices in .pdf, .xls format

Packaging: In blister tape on a reel with a diameter of 180 mm, 2000 pieces LR2512