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WhatSMDSign in

SMD code RY in DFN

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 DFN are printed RY

Not sure which one you have?

Answer up to 4 quick questions and these 15 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • R3116L291CDFNVoltage supervisor, RicohVoltage supervisorRicoh
    What it is
    Voltage supervisor
    Maker
    Ricoh
    Package
    DFN
    Pins
    Not recorded
    Details
    Voltage detector IC: 2.9V±0.8%, -Reset PPO
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • RP130K321ADFNLDO regulator, RicohLDO regulatorRicoh
    What it is
    LDO regulator
    Maker
    Ricoh
    Package
    DFN
    Pins
    Not recorded
    Details
    Low Noise 150mA LDO Regulator
    Source
    Published code list

    Is it dead? The meter test is below: Voltage regulator.

  • RP152L047ADFNLDO regulator, RicohLDO regulatorRicoh
    What it is
    LDO regulator
    Maker
    Ricoh
    Package
    DFN
    Pins
    Not recorded
    Details
    Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=2.5V/2.8V±1%, 150mA, +CE
    Source
    Published code list

    Is it dead? The meter test is below: Voltage regulator.

  • 12 more parts have no package on record. Nothing rules them out, so they stay.
    • 2SC3898Digital transistor (NPN, resistors built in), Sanyo ElectricDigital transistor (NPN, resistors built in)Sanyo Electric
      What it is
      Digital transistor (NPN, resistors built in)
      Maker
      Sanyo Electric
      Package
      Not recorded
      Pins
      Not recorded
      Details
      NPN transistor: Sw, 50V, 100mA, 200mW, 250MHz, B>100, R1=47k
      Source
      Published code list

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

    • 2SC5541Sanyo ElectricNot recordedSanyo Electric
      What it is
      Not recorded
      Maker
      Sanyo Electric
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Si-npn: UHF-S-Band, LN, 9V, 30mA, 100mW, B=90..200, 13GHz
      Source
      Published code list

      Is it dead? The meter test is below: This part.

    • BD53E56G-MVoltage supervisor, ROHMVoltage supervisorROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 5.6V±1%, -Reset PPO
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • IXD5127C52FNRVoltage 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, 50ms Rt delay
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • KDZ8.2VVYZener diode, KECZener diodeKEC
      What it is
      Zener diode
      Maker
      KEC
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Zener diode: 8.02..8.36V, Izt=5mA, Zzt=20, 100mW
      Source
      Published code list

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

    • XC6127C52FNRVoltage supervisor, TorexVoltage supervisorTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 5.2V±0.8%, +Reset PPO, -MR, Rdt=50ms
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • XC6129C52L9R-GVoltage supervisor, TorexVoltage supervisorTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 5.2V±0.8%, +Reset PPO, Releas. Delay, Det. Delay
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • XC6129C52LNR-GVoltage supervisor, TorexVoltage supervisorTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 5.2V±0.8%, +Reset PPO, Releas. Delay, Det. Delay
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • XC6129N52L9R-GVoltage supervisor, TorexVoltage supervisorTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 5.2V±0.8%, +Reset ODO, Releas. Delay, Det. Delay
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • XC6129N52LNR-GVoltage supervisor, TorexVoltage supervisorTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 5.2V±0.8%, +Reset ODO, Releas. Delay, Det. Delay
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

    • XC6224B28BNRLDO regulator, TorexLDO regulatorTorex
      What it is
      LDO regulator
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, 2.85V±1.5%, 150mA, +CE, PDR
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

    • XC6501C211NR-GLDO regulator, TorexLDO regulatorTorex
      What it is
      LDO regulator
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, 2.1V±1%, 200mA, +CE, PDR
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

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.

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.

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.

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.

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.

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.

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