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SMD code H2

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.

25 parts are printed H2

Not sure which one you have?

Answer up to 4 quick questions and these 25 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • AO6802SOT-23-6MOSFET, 6 pins, Alpha & Omega Semiconductor
    What it is
    MOSFET
    Maker
    Alpha & Omega Semiconductor
    Package
    SOT-23-6
    Pins
    6
    Details
    Low-voltage (12-30 V) MOSFET
    Source
    From the manufacturer's datasheet

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

    Datasheetfor AO6802, opens in a new tab
  • AO6802LSOT-23-6MOSFET, 6 pins, Alpha & Omega Semiconductor
    What it is
    MOSFET
    Maker
    Alpha & Omega Semiconductor
    Package
    SOT-23-6
    Pins
    6
    Details
    Low-voltage (12-30 V) MOSFET
    Source
    From the manufacturer's datasheet

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

    Datasheetfor AO6802L, opens in a new tab
  • BAV20WSOD-123FSwitching diode, 2 pins, Taiwan Semiconductor
    What it is
    Switching diode
    Maker
    Taiwan Semiconductor
    Package
    SOD-123F
    Pins
    2
    Source
    From the manufacturer's datasheet

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

    Datasheetfor BAV20W, opens in a new tab
  • BZD27C200PSOD-123FZener diode, 2 pins, Vishay
    What it is
    Zener diode
    Maker
    Vishay
    Package
    SOD-123F
    Pins
    2
    Source
    From the manufacturer's datasheet

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

    Datasheetfor BZD27C200P, opens in a new tab
  • BZX384C6V2SOD-323Zener diode, 2 pins, Vishay
    What it is
    Zener diode
    Maker
    Vishay
    Package
    SOD-323
    Pins
    2
    Details
    6.2 V Zener diode
    Source
    From the manufacturer's datasheet

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

    Datasheetfor BZX384C6V2, opens in a new tab
  • BZX585-C6V8SOD-523Zener diode, 2 pins, Nexperia
    What it is
    Zener diode
    Maker
    Nexperia
    Package
    SOD-523
    Pins
    2
    Pinout
    • 1 cathode
    • 2 anode
    Details
    6.8 V approx. ±5% voltage regulator (Zener) diode
    Source
    From the manufacturer's datasheet

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

    Datasheetfor BZX585-C6V8, opens in a new tab
  • EMH2SOT-563Digital transistor (NPN, resistors built in), 6 pins, JSCJ
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    JSCJ
    Package
    SOT-563
    Pins
    6
    Details
    Digital transistor (bias resistors built in), NPN, 100 mA
    Source
    From the manufacturer's datasheet

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

    Datasheetfor EMH2, opens in a new tab
  • MMBZ5242ASOT-23Zener diode, 3 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOT-23
    Pins
    3
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMBZ5242A, opens in a new tab
  • MMBZ5242AWSOT-323Zener diode, 3 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOT-323
    Pins
    3
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMBZ5242AW, opens in a new tab
  • MMBZ5242BSOT-23Zener diode, 3 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOT-23
    Pins
    3
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMBZ5242B, opens in a new tab
  • MMBZ5242B-AUSOT-23Zener diode, 3 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOT-23
    Pins
    3
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMBZ5242B-AU, opens in a new tab
  • MMBZ5242BTWSOT-363Zener diode, 6 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOT-363
    Pins
    6
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMBZ5242BTW, opens in a new tab
  • MMBZ5242BWSOT-323Zener diode, 3 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOT-323
    Pins
    3
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMBZ5242BW, opens in a new tab
  • MMSZ5242ASOD-123Zener diode, 2 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOD-123
    Pins
    2
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMSZ5242A, opens in a new tab
  • MMSZ5242ASSOD-323Zener diode, 2 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOD-323
    Pins
    2
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMSZ5242AS, opens in a new tab
  • MMSZ5242AS-AUSOD-323Zener diode, 2 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOD-323
    Pins
    2
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMSZ5242AS-AU, opens in a new tab
  • MMSZ5242BSOD-123Zener diode, 2 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOD-123
    Pins
    2
    Details
    SMD Planar Zener Diodes
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMSZ5242B, opens in a new tab
  • MMSZ5242B-AUSOD-123Zener diode, 2 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOD-123
    Pins
    2
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMSZ5242B-AU, opens in a new tab
  • MMSZ5242BSSOD-323Zener diode, 2 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOD-323
    Pins
    2
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMSZ5242BS, opens in a new tab
  • MMSZ5242BS-AUSOD-323Zener diode, 2 pins, Panjit
    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOD-323
    Pins
    2
    Source
    From the manufacturer's datasheet

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

    Datasheetfor MMSZ5242BS-AU, opens in a new tab
  • PUMH1SOT-363Digital transistor (NPN, resistors built in), 6 pins, Nexperia
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    Nexperia
    Package
    SOT-363
    Pins
    6
    Details
    NPN/NPN resistor-equipped double transistor; R1 = 22 kΩ, R2 = 22 kΩ
    Source
    From the manufacturer's datasheet

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

    Datasheetfor PUMH1, opens in a new tab
  • PUMH15SOT-363Digital transistor (NPN, resistors built in), 6 pins, Nexperia
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    Nexperia
    Package
    SOT-363
    Pins
    6
    Details
    50 V, 100 mA NPN/NPN resistor-equipped double transistor; R1 = 4.7 kΩ, R2 = 4.7 kΩ
    Source
    From the manufacturer's datasheet

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

    Datasheetfor PUMH15, opens in a new tab
  • UMH2NSOT-363Digital transistor (NPN, resistors built in), 6 pins, JSCJ
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    JSCJ
    Package
    SOT-363
    Pins
    6
    Details
    Digital transistor (bias resistors built in), NPN, 30 mA
    Source
    From the manufacturer's datasheet

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

    Datasheetfor UMH2N, opens in a new tab
  • 2 more parts have no package on record
    • BB814Infineon
      What it is
      Not recorded
      Maker
      Infineon
      Package
      Not recorded
      Pins
      Not recorded
      Source
      From the manufacturer's datasheet

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

      Datasheetfor BB814, opens in a new tab
    • BGH181BRF amplifier (MMIC), Infineon
      What it is
      RF amplifier (MMIC)
      Maker
      Infineon
      Package
      Not recorded
      Pins
      Not recorded
      Source
      From the manufacturer's datasheet

      Is it dead? The meter test is below: RF amplifier.

      Datasheetfor BGH181B, opens in a new tab

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.

MOSFET

Diode range, part lifted. Test drain to source first, then short gate to source and test again.

Working, it reads

One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.

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.
  • No body diode at all: failed open.
On the board
the gate usually has a resistor to the source, which reads as that resistor and 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.

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.

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.

RF amplifier

Voltage, board powered, on the output pin that the bias resistor or choke feeds.

Working, it reads

The output pin sits at the device voltage the datasheet gives, a few volts, below the supply.

Dead, it reads

  • Output pin at 0 V, or near 0 Ω to ground with the power off: shorted inside.
  • Output pin at the full supply voltage: open inside, no current flowing.
On the board:
Measured on the board with power on; the bias network is part of the reading.
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 figures depend on the part and its bias resistor. The datasheet gives both.

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.

Digital transistor

Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.

Working, it reads

Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.

Dead, it reads

  • Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
  • From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
  • Base to emitter near 0 Ω: failed short.
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:
The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
Watch for:
On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.

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 H2

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 H2

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

Open this in the search to correct a character or try another package.