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WhatSMDSign in

SMD code DS-

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.

82 parts are printed DS-

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.

  • UDZ36BSOD-323Zener diode, 2 pins, Formosa MicrosemiZener diodeSOD-3232 pinsFormosa Microsemi
    What it is
    Zener diode
    Maker
    Formosa Microsemi
    Package
    SOD-323
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor UDZ36B, opens in a new tab
  • UDZ36B-FLSOD-323Zener diode, 2 pins, Formosa MicrosemiZener diodeSOD-3232 pinsFormosa Microsemi
    What it is
    Zener diode
    Maker
    Formosa Microsemi
    Package
    SOD-323
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor UDZ36B-FL, opens in a new tab
  • UDZ36B-FL-Q1SOD-323Zener diode, 2 pins, Formosa MicrosemiZener diodeSOD-3232 pinsFormosa Microsemi
    What it is
    Zener diode
    Maker
    Formosa Microsemi
    Package
    SOD-323
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor UDZ36B-FL-Q1, opens in a new tab
  • UDZ36B-Q1SOD-323Zener diode, 2 pins, Formosa MicrosemiZener diodeSOD-3232 pinsFormosa Microsemi
    What it is
    Zener diode
    Maker
    Formosa Microsemi
    Package
    SOD-323
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor UDZ36B-Q1, opens in a new tab
  • UDZS36BSOD-323Zener diode, 2 pins, Taiwan SemiconductorZener diodeSOD-3232 pinsTaiwan Semiconductor
    What it is
    Zener diode
    Maker
    Taiwan Semiconductor
    Package
    SOD-323
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor UDZS36B, opens in a new tab
  • 2P710ASSOT-233 pins, PhiNot recordedSOT-233 pinsPhi
    What it is
    Not recorded
    Maker
    Phi
    Package
    SOT-23
    Pins
    3
    Details
    gp pnp hfe 170-340
    Source
    Published code list

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

  • 2PB710ASSOT-233 pins, NXPNot recordedSOT-233 pinsNXP
    What it is
    Not recorded
    Maker
    NXP
    Package
    SOT-23
    Pins
    3
    Details
    Si-pnp: GP, 60V, 500mA, 250mW, B=170..340, >140MHz
    Source
    Published code list

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

  • 2PB1219ASSOT-3233 pins, PhilipsNot recordedSOT-3233 pinsPhilips
    What it is
    Not recorded
    Maker
    Philips
    Package
    SOT-323
    Pins
    3
    Details
    Si-pnp: GP, 60V, 150mA, 200mW, B=170..340, 100MHz
    Source
    Published code list

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

  • 2SA1037AK-LNSSOT-233 pins, ROHMNot recordedSOT-233 pinsROHM
    What it is
    Not recorded
    Maker
    ROHM
    Package
    SOT-23
    Pins
    3
    Details
    Si-pnp: AF, 50V, 150mA, 200mW, B=270..560, >140MHz
    Source
    Published code list

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

  • 2SB0710A-SSOT-23PNP transistor, 3 pins, PanasonicPNP transistorSOT-233 pinsPanasonic
    What it is
    PNP transistor
    Maker
    Panasonic
    Package
    SOT-23
    Pins
    3
    Details
    PNP transistor: GP, AF, 60V, 500mA, 200mW, B=170..340, 200MHz
    Source
    Published code list

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

  • 2SB710A-SSOT-233 pins, PanNot recordedSOT-233 pinsPan
    What it is
    Not recorded
    Maker
    Pan
    Package
    SOT-23
    Pins
    3
    Details
    Si-pnp: GP, AF, 60V, 500mA, 200mW, B=170..340, 200MHz
    Source
    Published code list

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

  • 2SB789-SSOT-893 pins, PanNot recordedSOT-893 pinsPan
    What it is
    Not recorded
    Maker
    Pan
    Package
    SOT-89
    Pins
    3
    Details
    Si-pnp: AF-Drv, 100V, 1A, 1W, B=170..340, 120MHz
    Source
    Published code list

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

  • 2SB1219A-SSOT-3233 pins, PanNot recordedSOT-3233 pinsPan
    What it is
    Not recorded
    Maker
    Pan
    Package
    SOT-323
    Pins
    3
    Details
    Si-pnp: GP, 60V, 500mA, 150mW, B=170..340, 20MHz
    Source
    Published code list

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

  • 2SB1582-SSOT-4163 pins, PanasonicNot recordedSOT-4163 pinsPanasonic
    What it is
    Not recorded
    Maker
    Panasonic
    Package
    SOT-416
    Pins
    3
    Details
    Si-pnp: GP, 30V, 500mA, 200MHz, B=170..340
    Source
    Published code list

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

  • 2SD1946SOT-89NPN transistor, 3 pins, RenesasNPN transistorSOT-893 pinsRenesas
    What it is
    NPN transistor
    Maker
    Renesas
    Package
    SOT-89
    Pins
    3
    Details
    Si-npn: Hi-beta, 15V, 1A, B=800
    Source
    Published code list

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

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.

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.

PNP transistor

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

Working, it reads

Black probe on the base 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.

NPN transistor

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

Working, it reads

Red probe on the base 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.

Did you find your part?

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