SMD code EO
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.
18 parts are printed EO
Not sure which one you have?
Answer up to 4 quick questions and these 18 parts are ranked, with a meter test that settles it. It works on a dead part too.
2SC3265-OSOT-23Transistor, 3 pins, YFWTransistorSOT-233 pinsYFW
- What it is
- Transistor
- Maker
- YFW
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
2SC282OSOT-893 pins, ToshibaNot recordedSOT-893 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- npn power amp hfe 70-140 comp 2SA1002
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC2882-OSOT-89NPN transistor, 3 pins, ToshibaNPN transistorSOT-893 pinsToshiba
- What it is
- NPN transistor
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn: GP, 80V, 400mA, 500mW, B=70..140, 120MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC2882OSOT-893 pins, ToshibaNot recordedSOT-893 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- npn gp amp hfe 100-200 comp 2SA1203
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC3265OSOT-233 pins, ToshibaNot recordedSOT-233 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC5097OSOT-1434 pins, ToshibaNot recordedSOT-1434 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-143
- Pins
- 4
- Source
- Published code list
Is it dead? The meter test is below: This part.
HAC3265OSOT-23NPN transistor, 3 pins, Hottech ElectronicsNPN transistorSOT-233 pinsHottech Electronics
- What it is
- NPN transistor
- Maker
- Hottech Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- NPN transistor: AF-Amp, 35V, 800mA, 200mW, B=100..200, 120MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
HE6239P5SOT-89-5LDO regulator, 5 pins, Heermicr SemicconductorLDO regulatorSOT-89-55 pinsHeermicr Semicconductor
- What it is
- LDO regulator
- Maker
- Heermicr Semicconductor
- Package
- SOT-89-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.9V±2%, 500mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
HM7839P5RSOT-89-5LDO regulator, 5 pins, Huamei SemiconductorLDO regulatorSOT-89-55 pinsHuamei Semiconductor
- What it is
- LDO regulator
- Maker
- Huamei Semiconductor
- Package
- SOT-89-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.9V±2%, 500mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
HM7839PRSOT-89LDO regulator, 3 pins, Huamei SemiconductorLDO regulatorSOT-893 pinsHuamei Semiconductor
- What it is
- LDO regulator
- Maker
- Huamei Semiconductor
- Package
- SOT-89
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.9V±2%, 500mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
KTC3265SOT-23NPN transistor, 3 pinsNPN transistorSOT-233 pinsNot recorded
- What it is
- NPN transistor
- Maker
- Not recorded
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
KTC3265-OSOT-23NPN transistor, 3 pins, KECNPN transistorSOT-233 pinsKEC
- What it is
- NPN transistor
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: AF, 35V, 800mA, 200mW, B=100..200, 120MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
KTC4374-OSOT-89NPN transistor, 3 pins, KECNPN transistorSOT-893 pinsKEC
- What it is
- NPN transistor
- Maker
- KEC
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn: GP, AF, 80V, 400mA, 500mW, B=70..140, 120MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
MAX6314US31D3SOT-1434 pins, Analog DevicesNot recordedSOT-1434 pinsAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- SOT-143
- Pins
- 4
- Source
- Published code list
Is it dead? The meter test is below: This part.
1 more part has no package on record
2SC5097-ORF transistor, ToshibaRF transistorNot recordedNot recordedToshiba
- What it is
- RF transistor
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: VHF/UHF, LN, 20V, 15mA, 150mW, 10GHz, B=80..160
- Source
- Published code list
Is it dead? The meter test is below: Bipolar 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.
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.
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.
NPN transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red probe on the base 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 EO
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 7 more parts.
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