SMD code Y6s

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.

The last letter, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and Y6 was searched.

78 parts are printed Y6s

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.

ACZRT55C18-GSOT-23Zener diode, 3 pins, ComchipZener diodeSOT-233 pinsComchip
What it is
Zener diode
Maker
Comchip
Package
SOT-23
Pins
3
Details
Zener diode: 16.8..19.1V, Izt=5.0mA, Zzt=45, 350mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
APX809-29SRSOT-23Voltage supervisor, 3 pins, Diodes IncorporatedVoltage supervisorSOT-233 pinsDiodes Incorporated
What it is
Voltage supervisor
Maker
Diodes Incorporated
Package
SOT-23
Pins
3
Details
Voltage detector IC: 2.93V±1.5%, -Reset PPO
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
APX809S-29SR-7SOT-23Voltage supervisor, 3 pins, Diodes IncorporatedVoltage supervisorSOT-233 pinsDiodes Incorporated
What it is
Voltage supervisor
Maker
Diodes Incorporated
Package
SOT-23
Pins
3
Details
Voltage detector IC: 2.93V±1.5%, -Reset PPO, Rdt=240ms
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
BZF10C12SOD-123FZener diode, 2 pins, Diodesemi TechnologyZener diodeSOD-123F2 pinsDiodesemi Technology
What it is
Zener diode
Maker
Diodesemi Technology
Package
SOD-123F
Pins
2
Details
Zener diode: 11.4..12.6V, Izt=21mA, Zzt=9, 1W
Source
Published code list
Is it dead? The meter test is below: Zener diode.
BZT52-C18TSOD-5232 pins, Micro Commercial ComponentsNot recordedSOD-5232 pinsMicro Commercial Components
What it is
Not recorded
Maker
Micro Commercial Components
Package
SOD-523
Pins
2
Details
Z-diode: 18V±5%, Izt=5mA, Zzt=45Ω, 100mW
Source
Published code list
Is it dead? The meter test is below: Silicon diode.
BZT52C3V9-V-GSOD-123Zener diode, 2 pins, VishayZener diodeSOD-1232 pinsVishay
What it is
Zener diode
Maker
Vishay
Package
SOD-123
Pins
2
Details
Zener diode: 3.9V±5%, Izt=5mA, Zzt=90, 500mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
BZT52C18TSOD-523Zener diode, 2 pins, Micro Commercial ComponentsZener diodeSOD-5232 pinsMicro Commercial Components
What it is
Zener diode
Maker
Micro Commercial Components
Package
SOD-523
Pins
2
Details
Z-diode: 18V±5%, Izt=5mA, Zzt=45Ω, 150mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
BZV49-C18SOT-893 pins, InfineonNot recordedSOT-893 pinsInfineon
What it is
Not recorded
Maker
Infineon
Package
SOT-89
Pins
3
Details
Z-diode: 18V±5%, Izt=5mA, 1W
Source
Published code list
Is it dead? The meter test is below: Silicon diode.
BZX84-A18SOT-23Zener diode, 3 pins, Central SemiconductorZener diodeSOT-233 pinsCentral Semiconductor
What it is
Zener diode
Maker
Central Semiconductor
Package
SOT-23
Pins
3
Details
18 V ±1% voltage regulator (Zener) diode
Source
Published code list
Is it dead? The meter test is below: Zener diode.
Datasheetfor BZX84-A18, opens in a new tab
BZX84-B18SOT-23Zener diode, 3 pins, Central SemiconductorZener diodeSOT-233 pinsCentral Semiconductor
What it is
Zener diode
Maker
Central Semiconductor
Package
SOT-23
Pins
3
Details
18 V ±2% voltage regulator (Zener) diode
Source
Published code list
Is it dead? The meter test is below: Zener diode.
Datasheetfor BZX84-B18, opens in a new tab
5 more parts have no package on record
- ZGFM1012B-MSZener diode, Formosa MicrosemiZener diodeNot recordedNot 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 ZGFM1012B-MS, opens in a new tab
- ZGFM1012B-MS-Q1Zener diode, Formosa MicrosemiZener diodeNot recordedNot 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 ZGFM1012B-MS-Q1, opens in a new tab
- ZGFM1012B-MSTZener diode, Formosa MicrosemiZener diodeNot recordedNot 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 ZGFM1012B-MST, opens in a new tab
- ZGFM1012B-MST-Q1Zener diode, Formosa MicrosemiZener diodeNot recordedNot 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 ZGFM1012B-MST-Q1, opens in a new tab
- BD46E392G-MVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 3.9V±1%, -MR, -Reset PPO, Rdt=200ms
  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.

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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