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.
S-LBAS21HT1G-SSOD-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.
S-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.
S-LBAS21LT1G-SSOT-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.
S-LBAS321HT1GSOD-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 250 mA, VF Max 1 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-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.
S-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.
SBAS21DW5SOT-23-5Switching diode, 5 pins, onsemiSwitching diodeSOT-23-55 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOT-23-5
- Pins
- 5
- Details
- High Voltage Switching Diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SBAS21LSOT-23Switching diode, 3 pins, onsemiSwitching diodeSOT-233 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- High Voltage Switching Diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SMMSD103SOD-123Switching diode, 2 pins, onsemiSwitching diodeSOD-1232 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOD-123
- Pins
- 2
- Details
- High Voltage Switching Diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
TBAS21SOT-23Switching diode, 3 pins, Galaxy MicroelectronicsSwitching diodeSOT-233 pinsGalaxy Microelectronics
- What it is
- Switching diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 0.2A, 250V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
TBAS21HSOD-323Switching diode, 2 pins, Galaxy MicroelectronicsSwitching diodeSOD-3232 pinsGalaxy Microelectronics
- What it is
- Switching diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-323
- 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.
TMMSD103SOD-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.
TPS3703A5075DSEWSONVoltage supervisor, 6 pins, Texas InstrumentsVoltage supervisorWSON6 pinsTexas Instruments
- What it is
- Voltage supervisor
- Maker
- Texas Instruments
- Package
- WSON
- Pins
- 6
- Details
- High Accuracy Overvoltage and Undervoltage Reset IC With Time Delay and Manual Reset
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
TS5204CX33SOT-23LDO regulator, 3 pins, Taiwan SemiconductorLDO regulatorSOT-233 pinsTaiwan Semiconductor
- What it is
- LDO regulator
- Maker
- Taiwan Semiconductor
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
BAS21C2SOD-523Switching diode, 2 pins, CYStekSwitching diodeSOD-5232 pinsCYStek
- What it is
- Switching diode
- Maker
- CYStek
- Package
- SOD-523
- Pins
- 2
- Details
- 300 V switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon 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.
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.
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.
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.
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