# Unclear marking on a surface mount resistor

I have this resistor on a board.

Can someone can help me determine the value from the photo?

• Why 22k cannot be right? Commented Aug 10, 2020 at 17:16
• SMT resistors (at least the smaller packages) do not directly specify Ohms - there's not enough room. They use some specific code that (I believe) is unique to the vendor. Commented Aug 10, 2020 at 17:17
• @td127 there's a canonical coding for SMD resistors. it's two digits of mantissa, and one for the exponent. The value is mantissa · 10^(exponent) Ω. Commented Aug 10, 2020 at 17:26
• You didn't happen to measure the resistor in the circuit, did you, mnemonic? Commented Aug 10, 2020 at 17:27

SMT resistors have gotten so small, they are often now coded with a scheme that does NOT show the actual resistance value. (Not enough space to print the traditional code)

It's called the EIA-96 system.

https://www.hobby-hour.com/electronics/eia96-smd-resistors.php

• I did not know this. Thanks. Commented Aug 10, 2020 at 19:30
• Cool, I did not know this either (that the code was standardized). Commented Aug 10, 2020 at 21:36
1. You can't measure the value of a resistor with it in the circuit. You must remove it from the board.
2. Surface mount resistors are usually marked with a 3 or 4 digit code.

For a 3 digit code, the two left digits are a number and the right most digit is the number of zeros to append to the value. 103 is the value 10 with three more zeroes appended - total value is 10000, or 10 kiloohms.

A four digit code has three value digits to the left and one digit for the number of zeroes. 1002 is 100 with 2 zeroes appended - that's 10000, or 10 kiloohms.

The code on your resistor is a little unclear.

It is a 3 digit code. The left most digit is either 6 or 8. 624 would be 620 kiloohms, 824 would be 820 kiloohms.

You'll have to take it out and measure it if you can't get a better look at the left most digit.

• @Passerby: It's a surface mount part. You can't practically disconnect one side.
– JRE
Commented Aug 10, 2020 at 18:01
• although looking at those indents, an attempt was made
– user16222
Commented Aug 10, 2020 at 18:52
• Hey guys. I am just replying to say I know exactly how the marking works on these resistors, and yes, I did measure in circuit as the rest reflected their markings correctly. I know a parallel combination of circuits can throw the expected value of, but as said I was wondering why the marking looks like that. I dont own a hot reflow system, so regular soldering and wick is what I use. Desoldering gun I have yes, with a silicone tube made on top of teflon piece to suck, but doesnt work all the time. I mean for instance a marking of 103 will mean 10K resistor. So I understand all this perfectly Commented Aug 10, 2020 at 19:18
• And a 0 alone marking could mean a sensing resistor. So what is the first character in there, IN CASE, its a bad resistor when I managed to lift the one side from the board at least? Or will circuit analysis be my only way to get a estimate. Commented Aug 10, 2020 at 19:24
• – JRE
Commented Aug 10, 2020 at 19:34