SMD code K81
Marking codes are not standardised, and the same code is reused by unrelated makers for unrelated parts. Below is every part in our tables printed with it, and any printed with a code that is easy to misread as it, from the manufacturers' own marking tables and published code lists.
K81 on a chip resistor
810 Ω
810 Ω resistor
The K is both the decimal point and the multiplier: 810 Ω.
Check it with a meter
Lift one end and measure across it. A good one reads 810 Ω. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 810 Ω on the board is a fault. Open, or well above 810 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 810 Ω. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (SOT-23-5, USP-6C, SOT-23), K81 is a part code instead. Those parts are listed below.
2 parts are printed K81
Not sure which one you have?
Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.
all SOT-23, 3 pins. What differs:
BCV72RSOT-23STMicroelectronicsSTMicroelectronics
- What it is
- Not recorded
- Maker
- STMicroelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- equivalent BC546B
- Source
- Published code list
Is it dead? The meter test is below: This part.
DNBT8105SOT-23Diodes IncorporatedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- npn med pwr amp/sw 60V 1A comp DPBT8105
- Source
- Published code list
Is it dead? The meter test is below: This part.
Is it dead? One meter test per kind
Parts of the same kind are tested the same way, so each test is here once. Each part above points to its own.
This part
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
- Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
- Open between every pair of pins: failed open, or a part that reads open when working.
- On the board
- this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed with a code easy to misread as K81
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Did you find your part?
Open this in the search to correct a character or try another package.