SMD code JSs
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.
The last letter, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and JS was searched.
96 parts are printed JSs
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.
BAV23N3SOT-23Switching diode, 3 pins, CYStekSwitching diodeSOT-233 pinsCYStek
- What it is
- Switching diode
- Maker
- CYStek
- Package
- SOT-23
- Pins
- 3
- Details
- 250 V switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
CH501H-40GPSOD-323Schottky diode, 2 pins, ChenmkoSchottky diodeSOD-3232 pinsChenmko
- What it is
- Schottky diode
- Maker
- Chenmko
- Package
- SOD-323
- Pins
- 2
- Details
- SCHOTTKY BARRIER DIODE, 45 V, 0.1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
CH801H-30GPSOD-323Schottky diode, 2 pins, ChenmkoSchottky diodeSOD-3232 pinsChenmko
- What it is
- Schottky diode
- Maker
- Chenmko
- Package
- SOD-323
- Pins
- 2
- Details
- SCHOTTKY BARRIER DIODE, 30 V, 0.1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
GSBAS21HSOD-323Switching diode, 2 pins, Good-ArkSwitching diodeSOD-3232 pinsGood-Ark
- What it is
- Switching diode
- Maker
- Good-Ark
- Package
- SOD-323
- Pins
- 2
- Details
- Switching diode, 250 V, 200 mA
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
LBAS21HT1GSOD-323Switching diode, 2 pins, LRCSwitching diodeSOD-3232 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOD-323
- Pins
- 2
- Details
- Switching diode, VR 250 V, IF 200 mA, VF Max 1.25 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
LBAS21HT3GSOD-323Switching diode, 2 pins, LeiditechSwitching diodeSOD-3232 pinsLeiditech
- What it is
- Switching diode
- Maker
- Leiditech
- Package
- SOD-323
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
LBAS21LT1GSOT-23Switching diode, 3 pins, LRCSwitching diodeSOT-233 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Switching diode, VR 250 V, IF 225 mA, VF Max 1 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
LBAS521T1GSOD-523Switching diode, 2 pins, LRCSwitching diodeSOD-5232 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOD-523
- Pins
- 2
- Details
- Switching diode, VR 300 V, IF 250 mA, VF Max 1.1 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
LBAV21T1GSOD-123Switching diode, 2 pins, LRCSwitching diodeSOD-1232 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOD-123
- Pins
- 2
- Details
- Switching diode, VR 250 V, IF 200 mA, VF Max 1.25 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
MMSD103SOD-123Switching diode, 2 pins, Galaxy MicroelectronicsSwitching diodeSOD-1232 pinsGalaxy Microelectronics
- What it is
- Switching diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-123
- Pins
- 2
- Details
- 0.2A, 250V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
MMSD103-HFSOD-123Switching diode, 2 pins, ComchipSwitching diodeSOD-1232 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOD-123
- Pins
- 2
- Details
- 250 V, 200 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
NSVBAS21HSOD-323Switching diode, 2 pins, onsemiSwitching diodeSOD-3232 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOD-323
- Pins
- 2
- Details
- High Voltage Switching Diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-LBAS21HT1GSOD-323Switching diode, 2 pins, LRCSwitching diodeSOD-3232 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOD-323
- Pins
- 2
- Details
- Switching diode, VR 250 V, IF 200 mA, VF Max 1.25 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
2 more parts have no package on record
RQ5E025ATP-channel MOSFET, ROHMP-channel MOSFETNot recordedNot recordedROHM
- What it is
- P-channel MOSFET
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Pch -30V -2.5A Middle Power MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
RQ6E030ATP-channel MOSFET, ROHMP-channel MOSFETNot recordedNot recordedROHM
- What it is
- P-channel MOSFET
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Pch -30V -3.0A Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
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.
Silicon diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
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: failed open.
- A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
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.
P-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 drain, black on the source: 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. 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.
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