SMD code EJ-
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.
65 parts are printed EJ-
Not sure which one you have?
Answer up to 4 quick questions and these 50 parts are ranked, with a meter test that settles it. It works on a dead part too.
AMMSZ4717-HFSOD-123Zener diode, 2 pins, ComchipZener diodeSOD-1232 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SOD-123
- Pins
- 2
- Details
- 43 V 500 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZX84B33SOT-23Zener diode, 3 pins, DiotecZener diodeSOT-233 pinsDiotec
- What it is
- Zener diode
- Maker
- Diotec
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZX84B33ASOT-23Zener diode, 3 pins, Formosa MicrosemiZener diodeSOT-233 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZX84B33A-Q1SOT-23Zener diode, 3 pins, Formosa MicrosemiZener diodeSOT-233 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZX84C4V7WSOT-323Zener diode, 3 pins, Formosa MicrosemiZener diodeSOT-3233 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZX84C4V7W-Q1SOT-323Zener diode, 3 pins, Formosa MicrosemiZener diodeSOT-3233 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
FP6311FSDBSOT-563DC-DC converter, 6 pins, FitipowerDC-DC converterSOT-5636 pinsFitipower
- What it is
- DC-DC converter
- Maker
- Fitipower
- Package
- SOT-563
- Pins
- 6
- Details
- High Efficiency 5.5V 1A Synchronous Step Down Converter
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
MM3Z8B2SOD-323Zener diode, 2 pins, DiotecZener diodeSOD-3232 pinsDiotec
- What it is
- Zener diode
- Maker
- Diotec
- Package
- SOD-323
- Pins
- 2
- Details
- SMD Planar Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MM5Z4717-CSOD-523Zener diode, 2 pins, SeCoSZener diodeSOD-5232 pinsSeCoS
- What it is
- Zener diode
- Maker
- SeCoS
- Package
- SOD-523
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMSZ4717SOD-123Zener diode, 2 pins, Taitron ComponentsZener diodeSOD-1232 pinsTaitron Components
- What it is
- Zener diode
- Maker
- Taitron Components
- Package
- SOD-123
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMSZ4717-FLSOD-123FZener diode, 2 pins, Formosa MicrosemiZener diodeSOD-123F2 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMSZ4717-FL-Q1SOD-123FZener diode, 2 pins, Formosa MicrosemiZener diodeSOD-123F2 pinsFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMSZ4717-HFSOD-123Zener diode, 2 pins, ComchipZener diodeSOD-1232 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SOD-123
- Pins
- 2
- Details
- 43 V 0.5 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
2 more parts have no package on record
DBTC-9-4-75LX+RF coupler, Mini-CircuitsRF couplerNot recordedNot recordedMini-Circuits
- What it is
- RF coupler
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- RF directional coupler, 5-1200 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
LFCN-1500D+RF filter, Mini-CircuitsRF filterNot recordedNot recordedMini-Circuits
- What it is
- RF filter
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LTCC filter, DC-1500 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
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.
Zener diode
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
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, forward too: failed open.
- Holds well off its rated voltage on the supply test: drifted.
- A soft knee, or a voltage that creeps on the supply test: 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 meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
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.
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.
Printed with a code easy to misread as EJ-
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 EJ-
For a marking with its end worn or burnt off. Each code has a page of its own.
- EJ0P202
- EJF4
- EJLW2
- EJS2
- EJE5
- EJG5
- EJK3
- EJM3
- EJP3
- EJR2
- EJT2
- EJV2
- EJX2
- EJZ2
- EJ31
- EJ41
- EJ51
- EJ61
- EJL2
- EJA3
- EJAA2
- EJJ2
- EJB2
- EJC2
- EJD2
- EJH1
Codes not listed here are printed on 3 more parts.
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