SMD code 1243
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.
1243 on a chip resistor
124 kΩ
124 kΩ resistor, 1%
124 followed by 3 zeros. Four digits is normally the 1% series.
Check it with a meter
Lift one end and measure across it. A good one reads 124 kΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 124 kΩ on the board is a fault. Open, or well above 124 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 124 kΩ. 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 (SOIC-8, SOT-23, USP-6B), 1243 is a part code instead. Those parts are listed below.
Not sure which one you have?
Answer up to 4 quick questions and these 3 parts are ranked, with a meter test that settles it. It works on a dead part too.
The only part printed 1243 in our tables
LT1243CS8
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- SOIC-8
- Pins
- 8
- Details
- equivalent LT1243CN8
- Source
- Published code list
Is it dead?
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.
Was it this one?
Printed with a code easy to misread as 1243
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with 1243
For a marking with its end worn or burnt off. 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.