SMD code LFs
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 LF was searched.
98 parts are printed LFs
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-8052ALR-LFSOT-893 pins, ABLICNot recordedSOT-893 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SOT-89
- Pins
- 3
- Details
- equivalent S-8052ALR
- Source
- Published code list
Is it dead? The meter test is below: This part.
Si1307EDLSOT-323P-channel MOSFET, 3 pins, VishayP-channel MOSFETSOT-3233 pinsVishay
- What it is
- P-channel MOSFET
- Maker
- Vishay
- Package
- SOT-323
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: P-channel MOSFET.
SM6T7V5CSMB2 pins, SGS-Thomson MicroelectronicsNot recordedSMB2 pinsSGS-Thomson Microelectronics
- What it is
- Not recorded
- Maker
- SGS-Thomson Microelectronics
- Package
- SMB
- Pins
- 2
- Details
- TVS: 7,5V, 51A, 600W(1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMBG13SMBGTVS diode, 2 pins, VishayTVS diodeSMBG2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMBG
- Pins
- 2
- Details
- TVS: 13V, 25.2A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMBG13CSMBG2 pins, VishayNot recordedSMBG2 pinsVishay
- What it is
- Not recorded
- Maker
- Vishay
- Package
- SMBG
- Pins
- 2
- Details
- TVS: 13V, 25.2A, 600W(1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMBJ13CSMBTVS diode, 2 pins, VishayTVS diodeSMB2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMB
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TPSMZ20ATGSOD-128TVS diode, 2 pins, Fagor ElectronicaTVS diodeSOD-1282 pinsFagor Electronica
- What it is
- TVS diode
- Maker
- Fagor Electronica
- Package
- SOD-128
- Pins
- 2
- Details
- Transient voltage supressor: Vrm=17.1V, Vbr=19.0..21.0V, Ipp=22A, 600W
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TSMB20SMBTVS diode, 2 pins, VishayTVS diodeSMB2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=18.0..22.0V, Vrwm=16.2V, Ipp=21A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV06B130KSMB2 pins, ComchipNot recordedSMB2 pinsComchip
- What it is
- Not recorded
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- TVS: 13V, 10%, 25.2A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV06B130K-GSMBTVS diode, 2 pins, ComchipTVS diodeSMB2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=13.0V, Vbr=14.40..17.60V, Ipp=25.21A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
5 more parts have no package on record
XC6120C45NVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 4.5V±2%, CMOS +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6127N26JNRVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±0.8%, +Reset ODO, -MR, Rdt=400ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6129C26G9R-GVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±0.8%, +Reset PPO, Releasy Delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6129C26GNR-GVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±0.8%, +Reset PPO, Releasy Delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6129N26G9R-GVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.6V±0.8%, +Reset ODO, Releasy Delay
- 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.
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.
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.
TVS or ESD protection diode
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
- From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
- A reading both ways on a one-way part: leaky.
- A one-way part open both ways: failed open.
- On the board
- , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
- Compare:
- The same part on the next line or connector pin is the healthy reading to compare with.
- Watch for:
- A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
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.
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