SMD code EU in SOT-143

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.

2 parts in SOT-143 are printed EU

Not sure which one you have?

Answer up to 4 quick questions and these 25 parts are ranked, with a meter test that settles it. It works on a dead part too.

MAX6314US27D3-TSOT-1434 pins, Analog DevicesNot recorded4 pinsAnalog Devices
What it is
Not recorded
Maker
Analog Devices
Package
SOT-143
Pins
4
Details
CMOS-IC: Voltage Detector 2.7V, -MR, -Reset Bidir. PPO, 140ms
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
R3112Q481CSOT-1434 pins, Nisshinbo Micro DevicesNot recorded4 pinsNisshinbo Micro Devices
What it is
Not recorded
Maker
Nisshinbo Micro Devices
Package
SOT-143
Pins
4
Details
CMOS-IC: Voltage Detector 4,8V, Reset Open drain output
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
13 more parts have no package on record. Nothing rules them out, so they stay.
- DBTC-12-4X+RF coupler, Mini-CircuitsRF couplerNot recordedMini-Circuits
  What it is
  RF coupler
  Maker
  Mini-Circuits
  Package
  Not recorded
  Pins
  Not recorded
  Details
  RF directional coupler, 5-1000 MHz
  Source
  Manufacturer datasheet
  Is it dead? The meter test is below: This part.
  Datasheetfor DBTC-12-4X+, opens in a new tab
- NCP161BMX350LDO regulator, onsemiLDO regulatorNot recordedonsemi
  What it is
  LDO regulator
  Maker
  onsemi
  Package
  Not recorded
  Pins
  Not recorded
  Details
  LDO Regulator for RF and Analog Circuits - Ultra-Low Noise and High PSRR
  Source
  Manufacturer datasheet
  Is it dead? The meter test is below: Voltage regulator.
  Datasheetfor NCP161BMX350, opens in a new tab
- 2SD27033 pins, ROHMNot recorded3 pinsROHM
  What it is
  Not recorded
  Maker
  ROHM
  Package
  Not recorded
  Pins
  3
  Source
  Published code list
  Is it dead? The meter test is below: This part.
- BD4858FVEVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 5,8V, Reset Open drain output
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- BD4858GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 5,8V, Reset Open drain output
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- IXD5109C45ANVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.5V±2%, +Reset PPO
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- IXD5127C45KNRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.5V±0.8%, +Reset PPO, -MR, 800ms Rt delay
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- IXD5127N46ENRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.6V±0.8%, -Reset ODO, -MR, 800ms Rt delay
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- RP300K23DC2Voltage supervisor, RicohVoltage supervisorNot recordedRicoh
  What it is
  Voltage supervisor
  Maker
  Ricoh
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 2.32V±1%, +Reset PPO, -MR, Rdt=200ms
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- RP602Z360CDC-DC converter, RicohDC-DC converterNot recordedRicoh
  What it is
  DC-DC converter
  Maker
  Ricoh
  Package
  Not recorded
  Pins
  Not recorded
  Details
  DC/DC voltage converter IC: PWM/VFM B-boost, 3.6V±1.5%, 1.5A, 2.6MHz, +CE, CL, Reset-pr.
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- SS1030LHEWSSchottky diode, PanjitSchottky diodeNot recordedPanjit
  What it is
  Schottky diode
  Maker
  Panjit
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Diode: SBR, 30V, 1A, Vf<0.39V(1A)
  Source
  Published code list
  Is it dead? The meter test is below: Schottky diode.
- XC6109C45ANVoltage supervisor, TorexVoltage supervisorNot recordedTorex
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 4,5V, Reset Push-pull output
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- XC6119C45ANRVoltage supervisor, TorexVoltage supervisorNot recordedTorex
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.5V±2%, -Reset PPO
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.

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.

Integrated circuit

Voltage with the board powered; ohms from each pin to ground with it off.

Working, it reads

Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

Dead, it reads

A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.

On the board:: A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:: The surest reference is the same IC on a working board, measured pin by pin.
Watch for:: Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

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.

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.

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.

Codes that begin with EU

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 10 more parts.

Did you find your part?

Open this in the search to correct a character or try another package.