SMD code J1-
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.
180 parts are printed J1-
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.
LBSS138LT1GSOT-23N-channel MOSFET, 3 pins, LeiditechN-channel MOSFETSOT-233 pinsLeiditech
- What it is
- N-channel MOSFET
- Maker
- Leiditech
- Package
- SOT-23
- Pins
- 3
- Details
- N-channel MOSFET, 50 V, 0.2 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
LBSS138LT3GSOT-23N-channel MOSFET, 3 pins, LeiditechN-channel MOSFETSOT-233 pinsLeiditech
- What it is
- N-channel MOSFET
- Maker
- Leiditech
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
LM4003SOT-23N-channel MOSFET, 3 pins, LeiditechN-channel MOSFETSOT-233 pinsLeiditech
- What it is
- N-channel MOSFET
- Maker
- Leiditech
- Package
- SOT-23
- Pins
- 3
- Details
- N-channel MOSFET, 30 V, 0.4 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
LMSZ5246BT1GSOD-123Zener diode, 2 pins, LRCZener diodeSOD-1232 pinsLRC
- What it is
- Zener diode
- Maker
- LRC
- Package
- SOD-123
- Pins
- 2
- Details
- Zener diode, VZ Min 15.2 V, VZ Nom 16 V, VZ Max 16.8 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MM3Z3V9BWSOD-323Zener diode, 2 pins, YFWZener diodeSOD-3232 pinsYFW
- What it is
- Zener diode
- Maker
- YFW
- Package
- SOD-323
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5246ASOT-23Zener diode, 3 pins, PanjitZener diodeSOT-233 pinsPanjit
- What it is
- Zener diode
- Maker
- Panjit
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5246A-HFSOT-23Zener diode, 3 pins, ComchipZener diodeSOT-233 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 16 V 0.35 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5246AWSOT-323Zener diode, 3 pins, PanjitZener diodeSOT-3233 pinsPanjit
- What it is
- Zener diode
- Maker
- Panjit
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5246BSOT-23Zener diode, 3 pins, DC ComponentsZener diodeSOT-233 pinsDC Components
- What it is
- Zener diode
- Maker
- DC Components
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5246B-AUSOT-23Zener diode, 3 pins, PanjitZener diodeSOT-233 pinsPanjit
- What it is
- Zener diode
- Maker
- Panjit
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5246BTWSOT-363Zener diode, 6 pins, PanjitZener diodeSOT-3636 pinsPanjit
- What it is
- Zener diode
- Maker
- Panjit
- Package
- SOT-363
- Pins
- 6
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5246BWSOT-323Zener diode, 3 pins, DC ComponentsZener diodeSOT-3233 pinsDC Components
- What it is
- Zener diode
- Maker
- DC Components
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMSZ5246ASOD-123Zener diode, 2 pins, Galaxy MicroelectronicsZener diodeSOD-1232 pinsGalaxy Microelectronics
- What it is
- Zener diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-123
- Pins
- 2
- Details
- 16V, 500mW, Surface Mount Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMSZ5246A-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.
1 more part has no package on record
MMBZ5246BWSZener diode, Taitron ComponentsZener diodeNot recordedNot recordedTaitron Components
- What it is
- Zener diode
- Maker
- Taitron Components
- Package
- Not recorded
- Pins
- Not recorded
- Details
- SMD Zener Diodes (Three Terminals) - 200mW
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
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.
N-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. Lift a leg to be sure.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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.
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