SMD code HY 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.

5 parts in SOD-523 are printed HY

Not sure which one you have?

Answer up to 4 quick questions and these 28 parts are ranked, with a meter test that settles it. It works on a dead part too.

SMV1236-079LFSOD-523Varicap diode, SkyworksVaricap diodeSkyworks
What it is
Varicap diode
Maker
Skyworks
Package
SOD-523
Pins
2
Details
SMV123x Series: Hyperabrupt Junction Tuning Varactors
Source
Manufacturer datasheet
Is it dead? The meter test is below: PIN diode or varicap.
Datasheetfor SMV1236-079LF, opens in a new tab
BZT52B16WTSOD-523Zener diode, Taitron ComponentsZener diodeTaitron Components
What it is
Zener diode
Maker
Taitron Components
Package
SOD-523
Pins
2
Details
Zener diode: 15.68..16.32V, Izt=5.0mA, 200mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
DDZ9705TSOD-523Zener diode, Diodes IncorporatedZener diodeDiodes Incorporated
What it is
Zener diode
Maker
Diodes Incorporated
Package
SOD-523
Pins
2
Details
Zener diode: 18V±1%, If=10mA, 150mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
MM5ZB16HSOD-523Zener diode, Zowie TechnologyZener diodeZowie Technology
What it is
Zener diode
Maker
Zowie Technology
Package
SOD-523
Pins
2
Details
Zener diode: 15.68..16.32V, Zzt=40, Izt=5mA, 200mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
RL52Z16SOD-523Zener diode, Ruilong Yuan ElectronicsZener diodeRuilong Yuan Electronics
What it is
Zener diode
Maker
Ruilong Yuan Electronics
Package
SOD-523
Pins
2
Details
Zener diode: 15.68..16.32V, Zzt=40, Izt=5mA, 200mW
Source
Published code list
Is it dead? The meter test is below: Zener diode.
10 more parts have no package on record. Nothing rules them out, so they stay.
- MM5Z16VBZener diode, Formosa MicrosemiZener diodeFormosa 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 MM5Z16VB, opens in a new tab
- MM5Z16VB-Q1Zener diode, Formosa MicrosemiZener diodeFormosa 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 MM5Z16VB-Q1, opens in a new tab
- BD48L58GVoltage supervisor, ROHMVoltage supervisorROHM
  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.
- BU46L362GVoltage supervisor, ROHMVoltage supervisorROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 3.6V±1%, -Reset PPO, Rdt=200ms
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- BU4831FVoltage supervisor, ROHMVoltage supervisorROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 3,1V, -Reset Open drain output
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- BU4831FWEVoltage supervisor, ROHMVoltage supervisorROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 3,1V, -Reset Open drain output
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- BU4831GVoltage supervisor, ROHMVoltage supervisorROHM
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 3,1V, -Reset Open drain output
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- IXD5127C52BNRVoltage supervisor, IXYSVoltage supervisorIXYS
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 5.2V±0.8%, -Reset PPO, -MR, 100ms Rt delay
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- IXD5127N52GNRVoltage supervisor, IXYSVoltage supervisorIXYS
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 5.2V±0.8%, +Reset ODO, -MR, 100ms Rt delay
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- KDZ3.9VVYZener diode, KECZener diodeKEC
  What it is
  Zener diode
  Maker
  KEC
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Zener diode: 3.89..4.16V, Izt=5mA, Zzt=130, 100mW
  Source
  Published code list
  Is it dead? The meter test is below: Zener diode.

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.

PIN diode or varicap

Diode range, part lifted or one leg off the pad. Red probe on the anode.

Working, it reads

About 0.6 to 0.9 V anode to cathode, and open the other way.

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.

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 varicap that has drifted in capacitance reads normal on a meter. Only a capacitance meter or the tuning itself shows it.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

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.

Codes that begin with HY

For a marking with its end worn or burnt off. Each code has a page of its own.

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