SMD code FZ 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 FZ

Not sure which one you have?

Answer up to 4 quick questions and these 24 parts are ranked, with a meter test that settles it. It works on a dead part too.

BZT52B3V9WTSOD-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: 3.822..3.978V, Izt=5.0mA, 200mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
MM5Z3B9HSOD-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: 3.822..3.978V, Zzt=130, Izt=5mA, 200mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
RL52Z3V9SOD-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: 3.822..3.978V, Zzt=130, 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.
- MM3Z10VBW-CZener diode, SeCoSZener diodeNot recordedSeCoS
  What it is
  Zener diode
  Maker
  SeCoS
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Manufacturer datasheet
  Is it dead? The meter test is below: Zener diode.
  Datasheetfor MM3Z10VBW-C, opens in a new tab
- MM5Z3V9BZener 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 MM5Z3V9B, opens in a new tab
- MM5Z3V9B-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 MM5Z3V9B-Q1, opens in a new tab
- 1P2GU04QDRYTexas InstrumentsNot recordedNot recordedTexas Instruments
  What it is
  Not recorded
  Maker
  Texas Instruments
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS logic IC: Dual unbuffered inverter
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- 2SD27013 pins, ROHMNot recorded3 pinsROHM
  What it is
  Not recorded
  Maker
  ROHM
  Package
  Not recorded
  Pins
  3
  Source
  Published code list
  Is it dead? The meter test is below: This part.
- FP6121-BVSPLDO regulator, FitipowerLDO regulatorNot recordedFitipower
  What it is
  LDO regulator
  Maker
  Fitipower
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=3.3V/2.5V±2%, 150mA, +CE
  Source
  Published code list
  Is it dead? The meter test is below: Voltage regulator.
- IXD5127C54ANRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 5.4V±0.8%, -Reset PPO, -MR, 50ms Rt delay
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- IXD5127N54FNRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 5.4V±0.8%, +Reset ODO, -MR, 50ms Rt delay
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- RP300K29AA3Voltage supervisor, RicohVoltage supervisorNot recordedRicoh
  What it is
  Voltage supervisor
  Maker
  Ricoh
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 2.93V±1%, +Reset ODO, -MR, Rdt=50ms
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- XC6127C54ANRVoltage supervisor, TorexVoltage supervisorNot recordedTorex
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 5.4V±0.8%, -Reset PPO, -MR, Rdt=50ms
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- XC6127N54FNRVoltage supervisor, TorexVoltage supervisorNot recordedTorex
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 5.4V±0.8%, +Reset ODO, -MR, Rdt=50ms
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- XC6129C54C9R-GVoltage supervisor, TorexVoltage supervisorNot recordedTorex
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 5.4V±0.8%, -Reset PPO, Detect Delay
  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.

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.

Voltage regulator

Voltage, board powered, black probe on ground. Then ohms with the power off.

Working, it reads

Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.

Dead, it reads

Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.

On the board:: An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:: The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:: Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.

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 FZ

One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.

F253

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