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SMD code HT in SMAF

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.

1 part in SMAF is printed HT

Not sure which one you have?

Answer up to 4 quick questions and these 24 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • P4SMAFJ8.5ASMAFTVS diode, 2 pins, Blue RocketTVS diode2 pinsBlue Rocket
    What it is
    TVS diode
    Maker
    Blue Rocket
    Package
    SMAF
    Pins
    2
    Details
    TVS diode, unidirectional
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: TVS or ESD protection diode.

    Datasheetfor P4SMAFJ8.5A, opens in a new tab
  • 14 more parts have no package on record. Nothing rules them out, so they stay.
    • RQ5E065AJN-channel MOSFET, ROHMN-channel MOSFETNot recordedROHM
      What it is
      N-channel MOSFET
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Nch 30V 6.5A Small Signal MOSFET
      Source
      Manufacturer datasheet

      Is it dead? The meter test is below: N-channel MOSFET.

      Datasheetfor RQ5E065AJ, opens in a new tab
    • BU46L332GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 3.3V±1%, -Reset PPO, Rdt=200ms
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • BU4826FVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS-IC: Voltage Detector 2,6V, -Reset Open drain output
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • BU4826FWEVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS-IC: Voltage Detector 2,6V, -Reset Open drain output
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • BU4826GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS-IC: Voltage Detector 2,6V, -Reset Open drain output
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • IXD5127C44BNRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
      What it is
      Voltage supervisor
      Maker
      IXYS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.4V±0.8%, -Reset PPO, -MR, 100ms Rt delay
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • IXD5127N44GNRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
      What it is
      Voltage supervisor
      Maker
      IXYS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.4V±0.8%, +Reset ODO, -MR, 100ms Rt delay
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • LT4ME8.5ATVS diode, Lite-On SemiconductorTVS diodeNot recordedLite-On Semiconductor
      What it is
      TVS diode
      Maker
      Lite-On Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Transient voltage supressor: Vrwm=8.5V, Vbr=9.44..10.43V, Ipp=27.7A, 400W(1ms)
      Source
      Published code list

      Is it dead? The meter test is below: TVS or ESD protection diode.

    • P2SMSJ8.5ATVS diode, YeashinTVS diodeNot recordedYeashin
      What it is
      TVS diode
      Maker
      Yeashin
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Transient voltage supressor: Vrwm=8.5V, Vbr=9.44..10.4V, Ipp=13.9A, 200W(1ms)
      Source
      Published code list

      Is it dead? The meter test is below: TVS or ESD protection diode.

    • RP300K46BBVoltage supervisor, RicohVoltage supervisorNot recordedRicoh
      What it is
      Voltage supervisor
      Maker
      Ricoh
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.6V±1%, -Reset ODO, -MR, Rdt=100ms
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • SMF4L8.5AQTVS diode, Diodes IncorporatedTVS diodeNot recordedDiodes Incorporated
      What it is
      TVS diode
      Maker
      Diodes Incorporated
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Transient voltage supressor: Vrwm=8.5V, Vbr=9.44..10.43V, Ipp=27.7A, 400W(1ms)
      Source
      Published code list

      Is it dead? The meter test is below: TVS or ESD protection diode.

    • XC6127C44BNRVoltage supervisor, TorexVoltage supervisorNot recordedTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.4V±0.8%, -Reset PPO, -MR, Rdt=100ms
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • XC6127N44GNRVoltage supervisor, TorexVoltage supervisorNot recordedTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.4V±0.8%, +Reset ODO, -MR, Rdt=100ms
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • XC6129C44D9R-GVoltage supervisor, TorexVoltage supervisorNot recordedTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.4V±0.8%, -Reset PPO, Det. Delay, Undef. Protect
      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.

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.

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.

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 HT

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 HT

For a marking with its end worn or burnt off. Each code has a page of its own.

Codes not listed here are printed on 83 more parts.

Did you find your part?

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