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WhatSMDSign in

SMD code 04

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.

12 parts are printed 04

Not sure which one you have?

Answer up to 4 quick questions and these 12 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • BZX84-A11SOT-23Zener diode, 3 pins, Nexperia
    What it is
    Zener diode
    Maker
    Nexperia
    Package
    SOT-23
    Pins
    3
    Pinout
    • 1 anode
    • 2 not connected
    • 3 cathode
    Details
    11 V ±1% voltage regulator (Zener) diode
    Source
    From the manufacturer's datasheet

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

    Datasheetfor BZX84-A11, opens in a new tab
  • DTC114TCASOT-23Digital transistor (NPN, resistors built in), 3 pins, JSCJ
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    JSCJ
    Package
    SOT-23
    Pins
    3
    Details
    Digital transistor (bias resistors built in), NPN
    Source
    From the manufacturer's datasheet

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

    Datasheetfor DTC114TCA, opens in a new tab
  • DTC114TE3SOT-416Digital transistor (NPN, resistors built in), 3 pins, ROHM
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    ROHM
    Package
    SOT-416
    Pins
    3
    Details
    NPN digital transistor (bias resistor built-in); R1 = 10kOhm
    Source
    From the manufacturer's datasheet

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

    Datasheetfor DTC114TE3, opens in a new tab
  • DTC114TEBSOT-416Digital transistor (NPN, resistors built in), 3 pins, ROHM
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    ROHM
    Package
    SOT-416
    Pins
    3
    Details
    NPN digital transistor (bias resistor built-in); R1 = 10kOhm
    Source
    From the manufacturer's datasheet

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

    Datasheetfor DTC114TEB, opens in a new tab
  • DTC114TKASOT-23Digital transistor (NPN, resistors built in), 3 pins, ROHM
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    ROHM
    Package
    SOT-23
    Pins
    3
    Details
    NPN digital transistor (bias resistor built-in); R1 = 10kOhm
    Source
    From the manufacturer's datasheet

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

    Datasheetfor DTC114TKA, opens in a new tab
  • DTC114TMSOT-723Digital transistor (NPN, resistors built in), 3 pins, ROHM
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    ROHM
    Package
    SOT-723
    Pins
    3
    Details
    Digital transistor (bias resistors built in), NPN
    Source
    From the manufacturer's datasheet

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

    Datasheetfor DTC114TM, opens in a new tab
  • DTC114TU3SOT-323Digital transistor (NPN, resistors built in), 3 pins, ROHM
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    ROHM
    Package
    SOT-323
    Pins
    3
    Details
    NPN digital transistor (bias resistor built-in); R1 = 10kOhm
    Source
    From the manufacturer's datasheet

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

    Datasheetfor DTC114TU3, opens in a new tab
  • DTC114TUASOT-323Digital transistor (NPN, resistors built in), 3 pins, JSCJ
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    JSCJ
    Package
    SOT-323
    Pins
    3
    Details
    Digital transistor (bias resistors built in), NPN
    Source
    From the manufacturer's datasheet

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

    Datasheetfor DTC114TUA, opens in a new tab
  • DTC114TUBSOT-323Digital transistor (NPN, resistors built in), 3 pins, ROHM
    What it is
    Digital transistor (NPN, resistors built in)
    Maker
    ROHM
    Package
    SOT-323
    Pins
    3
    Details
    NPN digital transistor (bias resistor built-in); R1 = 10kOhm
    Source
    From the manufacturer's datasheet

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

    Datasheetfor DTC114TUB, opens in a new tab
  • PMSS3904SOT-323NPN transistor, 3 pins, Nexperia
    What it is
    NPN transistor
    Maker
    Nexperia
    Package
    SOT-323
    Pins
    3
    Details
    NPN switching transistor
    Source
    From the manufacturer's datasheet

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

    Datasheetfor PMSS3904, opens in a new tab
  • EIA-96:040603Precision resistor (EIA-96 code), 2 pins
    What it is
    Precision resistor (EIA-96 code)
    Maker
    Not recorded
    Package
    0603
    Pins
    2
    Details
    EIA-96 precision chip resistor, significand 10.7; the printed mark adds a multiplier letter (04A = 107 Ohm, 04B = 1.07 kOhm)
    Source
    Added by hand from a published table

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

    Datasheetfor EIA-96:04, opens in a new tab
  • 1 more part has no package on record
    • DTC114TEDigital transistor (NPN, resistors built in), JSCJ
      What it is
      Digital transistor (NPN, resistors built in)
      Maker
      JSCJ
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Digital transistor (bias resistors built in), NPN
      Source
      From the manufacturer's datasheet

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

      Datasheetfor DTC114TE, 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.

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.

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.

Resistor

Ohms range, across it, power off.

Working, it reads

Its marked value, within tolerance. On the board it reads the same or lower, because everything around it sits in parallel.

Dead, it reads

  • Open: burnt, cracked, or eaten through by sulphur. The commonest failure.
  • Well above its marked value: drifted high.
  • On the board, clearly higher than its marked value: it has failed, since the board can only pull a reading down.
On the board:
A reading lower than marked on the board proves nothing; lift one end. A reading higher than marked is a fault even on the board.
Compare:
The same position on another channel usually carries the same value, and so does the matching part on another board.
Watch for:
A burnt resistor usually means the part it feeds pulled too much. Find that before fitting a new one, or it burns too. The marking, not the reading, says what to fit.

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 04

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 04

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 15 more parts.

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