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SMD code ZZ in SOD-323

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.

7 parts in SOD-323 are printed ZZ

Not sure which one you have?

Answer up to 4 quick questions and these 42 parts are ranked, with a meter test that settles it. It works on a dead part too.

15 parts have no package on record. Nothing rules them out, so they stay.

  • ESDSU5V0AE1ESD protection diode, JSCJESD protection diodeNot recordedJSCJ
    What it is
    ESD protection diode
    Maker
    JSCJ
    Package
    Not recorded
    Pins
    Not recorded
    Details
    ESD protection diode, VRWM 5 V
    Source
    Manufacturer datasheet

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

    Datasheetfor ESDSU5V0AE1, opens in a new tab
  • LL15BT1006AESD protection diode, Formosa MicrosemiESD protection diodeNot recordedFormosa Microsemi
    What it is
    ESD protection diode
    Maker
    Formosa Microsemi
    Package
    Not recorded
    Pins
    Not recorded
    Source
    Manufacturer datasheet

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

    Datasheetfor LL15BT1006A, opens in a new tab
  • NC7S86L6Logic gate, onsemiLogic gateNot recordedonsemi
    What it is
    Logic gate
    Maker
    onsemi
    Package
    Not recorded
    Pins
    Not recorded
    Details
    TinyLogic HS 2-Input Exclusive-OR Gate
    Source
    Manufacturer datasheet

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

    Datasheetfor NC7S86L6, opens in a new tab
  • PS05CBUL2ESD protection diode, KECESD protection diodeNot recordedKEC
    What it is
    ESD protection diode
    Maker
    KEC
    Package
    Not recorded
    Pins
    Not recorded
    Source
    Manufacturer datasheet

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

    Datasheetfor PS05CBUL2, opens in a new tab
  • SGM13001BYUER6G6 pins, SG MicroNot recorded6 pinsSG Micro
    What it is
    Not recorded
    Maker
    SG Micro
    Package
    Not recorded
    Pins
    6
    Details
    Low Noise Amplifier for GNSS
    Source
    Manufacturer datasheet

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

    Datasheetfor SGM13001BYUER6G, opens in a new tab
  • SMAFJ100CATVS diode, Blue RocketTVS diodeNot recordedBlue Rocket
    What it is
    TVS diode
    Maker
    Blue Rocket
    Package
    Not recorded
    Pins
    Not recorded
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAFJ100CA, opens in a new tab
  • SMAHFL100CATVS diode, Formosa MicrosemiTVS diodeNot recordedFormosa Microsemi
    What it is
    TVS diode
    Maker
    Formosa Microsemi
    Package
    Not recorded
    Pins
    Not recorded
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAHFL100CA, opens in a new tab
  • SMF100CA-MFLTVS diode, Formosa MicrosemiTVS diodeNot recordedFormosa Microsemi
    What it is
    TVS diode
    Maker
    Formosa Microsemi
    Package
    Not recorded
    Pins
    Not recorded
    Source
    Manufacturer datasheet

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

    Datasheetfor SMF100CA-MFL, opens in a new tab
  • ULC0521CESD protection diode, LeiditechESD protection diodeNot recordedLeiditech
    What it is
    ESD protection diode
    Maker
    Leiditech
    Package
    Not recorded
    Pins
    Not recorded
    Details
    ESD protection diode, VRWM 5 V, Cj 0.26 pF
    Source
    Manufacturer datasheet

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

    Datasheetfor ULC0521C, opens in a new tab
  • 2SB1628ZZ3 pins, RenesasNot recorded3 pinsRenesas
    What it is
    Not recorded
    Maker
    Renesas
    Package
    Not recorded
    Pins
    3
    Source
    Published code list

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

  • BU4316FVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
    What it is
    Voltage supervisor
    Maker
    ROHM
    Package
    Not recorded
    Pins
    Not recorded
    Details
    CMOS-IC: Voltage Detector 1,6V, Reset Push-pull output
    Source
    Published code list

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

  • BU4316FWEVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
    What it is
    Voltage supervisor
    Maker
    ROHM
    Package
    Not recorded
    Pins
    Not recorded
    Details
    CMOS-IC: Voltage Detector 1,6V, Reset Push-pull output
    Source
    Published code list

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

  • BU4316GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
    What it is
    Voltage supervisor
    Maker
    ROHM
    Package
    Not recorded
    Pins
    Not recorded
    Details
    CMOS-IC: Voltage Detector 1,6V, Reset Push-pull output
    Source
    Published code list

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

  • CD-0603-Z39BournsNot recordedNot recordedBourns
    What it is
    Not recorded
    Maker
    Bourns
    Package
    Not recorded
    Pins
    Not recorded
    Details
    Z-diode: 37.05..40.95V, 5mA, Zzt=90Ω, 150mW
    Source
    Published code list

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

  • CD-1005-Z39BournsNot recordedNot recordedBourns
    What it is
    Not recorded
    Maker
    Bourns
    Package
    Not recorded
    Pins
    Not recorded
    Details
    Z-diode: 37.05..40.95V, 5mA, Zzt=90Ω, 200mW
    Source
    Published code list

    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.

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.

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.

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.

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