SMD code T83
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.
9 parts are printed T83
Not sure which one you have?
Answer up to 4 quick questions and these 9 parts are ranked, with a meter test that settles it. It works on a dead part too.
LBAT68LT1GSOT-23Schottky diode, 3 pins, LRCSchottky diodeSOT-233 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Schottky diode, VR 8 V, IF 0.13 A, VF Max 0.34 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
2SC4955SOT-233 pins, NEC ElectronicsNot recordedSOT-233 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- npn RF fT 12GHz @3V 10mA
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC4957SOT-1434 pins, NEC ElectronicsNot recordedSOT-1434 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-143
- Pins
- 4
- Details
- npn RF fT 12GHz @3V 10mA
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC4959SOT-3233 pins, NEC ElectronicsNot recordedSOT-3233 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-323
- Pins
- 3
- Details
- npn RF fT 12GHz @3V 10mA
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC5015SOT-3434 pins, RenesasNot recordedSOT-3434 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-343
- Pins
- 4
- Details
- npn RF fT 12GHz @3V 10mA
- Source
- Published code list
Is it dead? The meter test is below: This part.
uPA806T-KBSOT-3636 pins, NEC ElectronicsNot recordedSOT-3636 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-363
- Pins
- 6
- Details
- NPN transistor: Dual, VHF/UHF, 9V, 30mA, 150mW, 12GHz, B=75..150
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
µPA806T-KBSOT-3636 pins, RenesasNot recordedSOT-3636 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-363
- Pins
- 6
- Details
- Si-npn: Dual, VHF/UHF, 9V, 30mA, 150mW, 12GHz, B=75..150
- Source
- Published code list
Is it dead? The meter test is below: This part.
2 more parts have no package on record
2SC5015-KBRF transistor, NEC ElectronicsRF transistorNot recordedNot recordedNEC Electronics
- What it is
- RF transistor
- Maker
- NEC Electronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: HF, LN, 9V, 30mA, 150mW, B=75..150, 12GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
XC6218P34HLDO regulator, TorexLDO regulatorNot recordedNot recordedTorex
- What it is
- LDO regulator
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.4V±2%, 200mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, 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.
- A reading the wrong way round as well: leaky.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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.
Bipolar transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: leaky.
- 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Voltage regulator
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
- Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
- Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
- Power off, input to output near 0 Ω: shorted.
- On the board:
- An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
- Compare:
- The same regulator on another rail or another board shows the right voltages and the right resistances.
- Watch for:
- Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
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 T83
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 T83
For a marking with its end worn or burnt off. Each code has a page of its own.
Codes not listed here are printed on 43 more parts.
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