SMD code FR in SOD-523

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.

3 parts in SOD-523 are printed FR

Not sure which one you have?

Answer up to 4 quick questions and these 33 parts are ranked, with a meter test that settles it. It works on a dead part too.

BZT52B3V0WTSOD-523Zener diode, 2 pins, Taitron ComponentsZener diode2 pinsTaitron Components
What it is
Zener diode
Maker
Taitron Components
Package
SOD-523
Pins
2
Details
Zener diode: 2.940..3.060V, Izt=5.0mA, 200mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
MM5Z3B0HSOD-523Zener diode, 2 pins, Zowie TechnologyZener diode2 pinsZowie Technology
What it is
Zener diode
Maker
Zowie Technology
Package
SOD-523
Pins
2
Details
Zener diode: 2.94..3.06V, Zzt=120, Izt=5mA, 200mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
RL52Z3V0SOD-523Zener diode, 2 pins, Ruilong Yuan ElectronicsZener diode2 pinsRuilong Yuan Electronics
What it is
Zener diode
Maker
Ruilong Yuan Electronics
Package
SOD-523
Pins
2
Details
Zener diode: 2.94..3.06V, Zzt=120, Izt=5mA, 200mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
12 more parts have no package on record. Nothing rules them out, so they stay.
- L2SA1774RT1GPNP transistor, LRCPNP transistorNot recordedLRC
  What it is
  PNP transistor
  Maker
  LRC
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Bipolar transistor, PNP, IC 150 mA, VCEO 50 V
  Source
  Manufacturer datasheet
  Is it dead? The meter test is below: PNP transistor.
  Datasheetfor L2SA1774RT1G, opens in a new tab
- MM5Z3V0BZener diode, Formosa MicrosemiZener diodeNot recordedFormosa Microsemi
  What it is
  Zener diode
  Maker
  Formosa Microsemi
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Manufacturer datasheet
  Is it dead? The meter test is below: Zener diode.
  Datasheetfor MM5Z3V0B, opens in a new tab
- MM5Z3V0B-Q1Zener diode, Formosa MicrosemiZener diodeNot recordedFormosa Microsemi
  What it is
  Zener diode
  Maker
  Formosa Microsemi
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Manufacturer datasheet
  Is it dead? The meter test is below: Zener diode.
  Datasheetfor MM5Z3V0B-Q1, opens in a new tab
- S-L2SA1774RT1GPNP transistor, LRCPNP transistorNot recordedLRC
  What it is
  PNP transistor
  Maker
  LRC
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Bipolar transistor, PNP, IC 150 mA, VCEO 50 V
  Source
  Manufacturer datasheet
  Is it dead? The meter test is below: PNP transistor.
  Datasheetfor S-L2SA1774RT1G, opens in a new tab
- 2SA1576UBPNP transistorPNP transistorNot recordedNot recorded
  What it is
  PNP transistor
  Maker
  Not recorded
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Published code list
  Is it dead? The meter test is below: PNP transistor.
- 2SA1577QNot recordedNot recordedNot recorded
  What it is
  Not recorded
  Maker
  Not recorded
  Package
  Not recorded
  Pins
  Not recorded
  Details
  see 2SA1037K above
  Source
  Published code list
  Is it dead? The meter test is below: This part.
- 2SA1774EBPNP transistor, ROHMPNP transistorNot recordedROHM
  What it is
  PNP transistor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Published code list
  Is it dead? The meter test is below: PNP transistor.
- 2SA1774EBR3 pins, ROHMNot recorded3 pinsROHM
  What it is
  Not recorded
  Maker
  ROHM
  Package
  Not recorded
  Pins
  3
  Details
  equivalent 2SA933ASR
  Source
  Published code list
  Is it dead? The meter test is below: This part.
- BD48L29GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage Detector
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- BD4935FVEVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 3,5V, Reset Push-pull output
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- BD4935GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 3,5V, Reset Push-pull output
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- BU46K474GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.7V±1%, -Reset PPO, Rdt=400ms
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.

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.

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.

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.

Codes that begin with FR

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 19 more parts.

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