SMD Resistor markings

S

Scarr

Member

• Mar 24, 2011

• #1

Hi all,

I have two resistors, can anyone tell what tolerances they are, they have the markings

102
10B (that is a B not eight)

Or can you not determine it?

Thanks

Steve

 

Reloadron

Well-Known Member

Most Helpful Member

• Mar 24, 2011

• #2

If the first is a resistor it should be 1K as in One-Zero and two zeros. I am not sure about the second one.

Ron

 

S

Scarr

Member

• Mar 24, 2011

• #3

Pictures

I have attached some pictures to help with my question.

Thanks

Steve

 

Attachments

• 01B.jpg

  14.8 KB · Views: 602
• 102.jpg

  15.1 KB · Views: 332

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Dean Huster

Well-Known Member

• Mar 24, 2011

• #4

Three figures on an SMT resistor indicate the value -- first sig digit, second sig digit, power of 10 multiplier -- of a 5% device.
Four figures on an SMT resistor indicate the value -- first sig digit, second sig digit, third sig digit, power of 10 multiplier -- of a 1% device.

The letter "R" is a decimal point indicator for low values, e.g., 1R8 for 1.8 ohms, 49R9 for 49.9 ohms (1%).

However, I'm no SMT guru, so resistors with better than 1% tolerance? Don't know.
10B? Dunno, either. What does your ohmmeter say about this part? That's the first step in analyzing a part with an unknown value.

 

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shuiping56

New Member

• Mar 24, 2011

• #5

you can try hhe

 

davenn

Active Member

• Mar 25, 2011

• #6

and its NOT 10B its 01B not that it helps I havent seen a resistor marked as such
definately needs to be measured to find out

Dave

 

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Dean Huster

Well-Known Member

• Mar 26, 2011

• #7

Oops. Went by the text in the OP and didn't check the pics. Measure the thing with an ohmmeter and see if there's low resistance or an open. If open, I'd suspect a cap, value of 0.01µF. However, in most cases it would be marked as "104".

 

Mr RB

Well-Known Member

• Mar 26, 2011

• #8

Low ohms resistor.

 

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Diver300

Well-Known Member

Most Helpful Member

• Mar 27, 2011

• #9

01S

The 01B is 1kΩ

So is the one labelled 102

They use different marking schemes.

The tolerance isn't marked. You have to guess. However, 1% ones aren't expensive.

 

davenn

Active Member

• Mar 27, 2011

• #10

Diver300 said:

01S
The 01B is 1kΩ
So is the one labelled 102
They use different marking schemes.
The tolerance isn't marked. You have to guess. However, 1% ones aren't expensive.

Click to expand...

Outstanding Diver !!
havent seen that list before, has now been saved to component data folder

cheers
Dave

 

Mr RB

Well-Known Member

• Mar 28, 2011

• #11

Interesting! Thanks for the info.