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WhatSMDSign in

SMD code -KB

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.

91 parts are printed -KB

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.

  • EM6354XSC4B-4.6+SOT-3434 pins, EM Microelectronic-Marin SANot recordedSOT-3434 pinsEM Microelectronic-Marin SA
    What it is
    Not recorded
    Maker
    EM Microelectronic-Marin SA
    Package
    SOT-343
    Pins
    4
    Source
    Published code list

    Is it dead? The meter test is below: This part.

  • FP6811-26NC4PSOT-343Voltage supervisor, 4 pins, FitipowerVoltage supervisorSOT-3434 pinsFitipower
    What it is
    Voltage supervisor
    Maker
    Fitipower
    Package
    SOT-343
    Pins
    4
    Details
    Voltage detector IC: 2.63V±1.5%, -Reset ODO, -MR
    Source
    Published code list

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

  • KTK211BSOT-233 pins, KECNot recordedSOT-233 pinsKEC
    What it is
    Not recorded
    Maker
    KEC
    Package
    SOT-23
    Pins
    3
    Details
    VHF n-ch FET Idss 9-15
    Source
    Published code list

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

  • MMBT8099LT1GSOT-233 pins, onsemiNot recordedSOT-233 pinsonsemi
    What it is
    Not recorded
    Maker
    onsemi
    Package
    SOT-23
    Pins
    3
    Details
    TRANS NPN 80V 500MA SOT23-3
    Source
    Published code list

    Is it dead? The meter test is below: This part.

  • PT7M6221CLC3ESOT-323Voltage supervisor, 3 pins, Pericom TechnologyVoltage supervisorSOT-3233 pinsPericom Technology
    What it is
    Voltage supervisor
    Maker
    Pericom Technology
    Package
    SOT-323
    Pins
    3
    Details
    Voltage detector IC: 2.1V±1.5%, -Reset PPO, L-free
    Source
    Published code list

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

  • PT7M6221CLC4SOT-23-5Voltage supervisor, 5 pins, Pericom TechnologyVoltage supervisorSOT-23-55 pinsPericom Technology
    What it is
    Voltage supervisor
    Maker
    Pericom Technology
    Package
    SOT-23-5
    Pins
    5
    Details
    Voltage detector IC: 2.1V±1.5%, -Reset PPO
    Source
    Published code list

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

  • PT7M6221CLC4ESOT-23-5Voltage supervisor, 5 pins, Pericom TechnologyVoltage supervisorSOT-23-55 pinsPericom Technology
    What it is
    Voltage supervisor
    Maker
    Pericom Technology
    Package
    SOT-23-5
    Pins
    5
    Details
    Voltage detector IC: 2.1V±1.5%, -Reset PPO, Lead free
    Source
    Published code list

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

  • PT7M6221CLTA3ESOT-23Voltage supervisor, 3 pins, Pericom TechnologyVoltage supervisorSOT-233 pinsPericom Technology
    What it is
    Voltage supervisor
    Maker
    Pericom Technology
    Package
    SOT-23
    Pins
    3
    Details
    Voltage detector IC: 2.1V±1.5%, -Reset PPO, L-free
    Source
    Published code list

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

  • 7 more parts have no package on record
    • FP6811-26NC8PVoltage supervisor, FitipowerVoltage supervisorNot recordedNot recordedFitipower
      What it is
      Voltage supervisor
      Maker
      Fitipower
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 2.63V±1.5%, -Reset ODO, -MR
      Source
      Published code list

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

    • FP6812-40CC8PVoltage supervisor, FitipowerVoltage supervisorNot recordedNot recordedFitipower
      What it is
      Voltage supervisor
      Maker
      Fitipower
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.0V±1.5%, +Reset PPO, -MR
      Source
      Published code list

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

    • IXD5120C112NR-GVoltage supervisor, IXYSVoltage supervisorNot recordedNot recordedIXYS
      What it is
      Voltage supervisor
      Maker
      IXYS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.1V±2% -Reset PPO
      Source
      Published code list

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

    • IXD5127C18CNRVoltage supervisor, IXYSVoltage supervisorNot recordedNot recordedIXYS
      What it is
      Voltage supervisor
      Maker
      IXYS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.8V±0.8%, -Reset PPO, -MR, 200ms Rt delay
      Source
      Published code list

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

    • IXD5127N18HNRVoltage supervisor, IXYSVoltage supervisorNot recordedNot recordedIXYS
      What it is
      Voltage supervisor
      Maker
      IXYS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.8V±0.8%, +Reset ODO, -MR, 200ms Rt delay
      Source
      Published code list

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

    • KDZ4.7BZener diode, ROHMZener diodeNot recordedNot recordedROHM
      What it is
      Zener diode
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Z-diode: 4,7V±2,5%, 40mA, 1W
      Source
      Published code list

      Is it dead? The meter test is below: Zener diode.

    • KRA752FKECNot recordedNot recordedNot recordedKEC
      What it is
      Not recorded
      Maker
      KEC
      Package
      Not recorded
      Pins
      Not recorded
      Details
      PNP transistor: Dual, Sw, 20V, 50mA, 50mW, R1/R2=10k/10k
      Source
      Published code list

      Is it dead? The meter test is below: Bipolar transistor.

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.

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.

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.

Bipolar transistor

Diode range, part lifted or its base leg off the pad.

Working, it reads

From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.

Dead, it reads

  • Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
  • The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
  • Only one junction reads, or none: a junction has failed open. It then looks like a diode.
  • A reading the wrong way round, where it should be open: 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.

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.

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