Explanation of the Marking Method for Chip Resistance Value
Time:2023-04-15
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Labeling method for resistance values of SMD resistors
1. E-24 annotation method
The E-24 annotation method has two significant digits with an accuracy of ± 2% (- G), ± 5% (- J), and ± 10% (- K)
(1) Common resistance labels
XXY XX represents the base number, Y represents the index
for example
470 = 47Ω
103 = 10kΩ
224 = 220kΩ
(2) Marking of Resistance Less than 10 Ohms
R represents the decimal point of resistance in ohms, and m represents the decimal point of resistance in milliohms
for example
1R0 = 1.0Ω
R20 = 0.20Ω
5R1 = 5.1Ω
R007 = 7.0mΩ
4m7 = 4.7mΩ
2. E-96 annotation method
The E-96 annotation method has three significant digits with an accuracy of ± 1% (- F)
(1) Common resistance labels
XXXY XXX represents the base number, Y represents the index
for example
4700 = 470Ω
1003 = 100kΩ
2203 = 220kΩ
(2) Marking of Resistance Less than 10 Ohms
R represents the decimal point of resistance in ohms, and m represents the decimal point of resistance in milliohms
for example
1R00 = 1.00Ω
R200 = 0.200Ω
R200 = 0.200Ω
5R10 = 5.10Ω
R007 = 7.00mΩ
4m70 = 4.70mΩ
(3) E-96 Multiplier Code annotation method
XXY
XX represents the code of the base number, and the specific value can be found in the Multiplier Code table
Y represents the code of the index, and the specific value should also be found in the Multiplier Code table
For example:
18A = 150Ω
02C = 10.2kΩ
E96 series resistor specification sheet (Multiplier Code)
Source: Novice Electronic Website Author: Original Editor of this website Editing Time: June 22, 2007 Click: 650 times
Keywords: E96 series resistance specification table, accuracy error ± 1%
E represents the meaning of exponential interval, and 96 represents the existence of 96 series of numbers
The resistance grid error of the E96 series is relatively small, with 96 basic numbers. This specification is commonly used in situations with high accuracy requirements
E96 series resistor specification table
E96 numerical series
Explanation of allowable deviation of basic values
100±1%
High precision and cost
For example, if 01C is written on a chip resistor, it is 102 * 10 ^ 2, which is 10K
A=10； B=100； C=1000； And so on
01=100； 02=102； 03=105；…… 22= 165； successively
100 01
102 02
105 03
107 04
110
113
115
118
121
124
127
130
133
137
140
143
147
150
154
158
162
165 22
169
174
178
182
187
191
196
200
205
210
215
221
226
232
237
243
249
255
261
267
274
280
287
294
301
309
316
324
332
340
348
357
365
374
383
392
402
412
422
432
442
453
464
475
487
499
511
523
536
549
562
576
590
604
619
634
649
665
681
698
715
732
750
768
787
806
825
845
866
887
909
931
953
976 096
E6, E12, E24, E48, E96, E192 series resistor description
Keywords: E6 E12 E24 E48 E96 E192 Resistance Meaning
E6, E12, E24, E48, E96, E192 series resistor description
‘E‘ represents‘ Exponential Spacing ‘
Its foundation is to tolerate a certain amount of error and use exponential spacing as the standard specification.
This standard has been widely adopted internationally, and this series of resistance values is called the nominal resistance value of the resistance.
The nominal resistance values of resistors are divided into six series: E6, E12, E24, E48, E96, and E192, which are respectively applicable to resistors with allowable deviations of ± 20%, ± 10%, ± 5%, ± 2%, ± 1%, and ± 0.5%. The E24 series is a commonly used numerical system, while the E48, E96, and E192 series are high-precision resistance numerical systems
The nominal resistance value of the E6 series resistor corresponds to a permissible deviation of ± 20%
The nominal resistance value of the E12 series resistor corresponds to a permissible deviation of ± 10%
The nominal resistance value of the E24 series resistor corresponds to a permissible deviation of ± 5%
The nominal resistance value of the E48 series resistor corresponds to a permissible deviation of ± 2%
The nominal resistance value of the E96 series resistor corresponds to a permissible deviation of ± 1%
The nominal resistance value of the E192 series resistor, with corresponding allowable deviations of ± 0.5%, ± 0.25%, ± 0.1%
In the era of electronic tubes in the 20th century, electronic component manufacturers negotiated and adopted a unified standard for the composition of component values in order to facilitate the management and selection of component specifications, meet the requirements of standardization for large-scale production of resistors, and ensure that the specifications of resistors were not too many.
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