SMD code 99
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.
3 parts are printed 99
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.
DTA115TMSOT-723Digital transistor (PNP, resistors built in), 3 pins, JSCJDigital transistor (PNP, resistors built in)SOT-7233 pinsJSCJ
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- JSCJ
- Package
- SOT-723
- Pins
- 3
- Details
- Digital transistor (bias resistors built in), PNP
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Digital transistor.
2 more parts have no package on record
BAR90-099LRHPIN diode, InfineonPIN diodeNot recordedNot recordedInfineon
- What it is
- PIN diode
- Maker
- Infineon
- Package
- Not recorded
- Pins
- Not recorded
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: PIN diode or varicap.
DTA115TEDigital transistor (PNP, resistors built in), JSCJDigital transistor (PNP, resistors built in)Not recordedNot recordedJSCJ
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- JSCJ
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Digital transistor (bias resistors built in), PNP
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Digital transistor.
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.
PIN diode or varicap
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.6 to 0.9 V anode to cathode, and open the other way.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- Open both ways: failed open.
- 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.
- Watch for:
- A varicap that has drifted in capacitance reads normal on a meter. Only a capacitance meter or the tuning itself shows it.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Digital transistor
Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.
Working, it reads
Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.
Dead, it reads
- Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
- From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
- Base to emitter near 0 Ω: failed short.
- 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:
- The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
- Watch for:
- On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Codes that begin with 99
For a marking with its end worn or burnt off. Each code has a page of its own.
Open this in the search to correct a character or try another package.