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SMD code R in SOD-923

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.

8 parts in SOD-923 are printed R

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.

  • CDZCV5.1BSOD-923ESD protection diode, ROHMESD protection diodeROHM
    What it is
    ESD protection diode
    Maker
    ROHM
    Package
    SOD-923
    Pins
    2
    Details
    Transient Voltage Suppressor
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: TVS or ESD protection diode.

    Datasheetfor CDZCV5.1B, opens in a new tab
  • ESD9C3.3SSOD-923ESD protection diode, onsemiESD protection diodeonsemi
    What it is
    ESD protection diode
    Maker
    onsemi
    Package
    SOD-923
    Pins
    2
    Details
    ESD Protection Diode SERIES
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: TVS or ESD protection diode.

    Datasheetfor ESD9C3.3S, opens in a new tab
  • LNZ9F16VT5GSOD-923Zener diode, LRCZener diodeLRC
    What it is
    Zener diode
    Maker
    LRC
    Package
    SOD-923
    Pins
    2
    Details
    Zener diode, VZ Min 15.2 V, VZ Nom 16 V, VZ Max 16.8 V
    Source
    Manufacturer datasheet

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

    Datasheetfor LNZ9F16VT5G, opens in a new tab
  • NSR0340P2SOD-923Schottky diode, onsemiSchottky diodeonsemi
    What it is
    Schottky diode
    Maker
    onsemi
    Package
    SOD-923
    Pins
    2
    Details
    Schottky Barrier Diode
    Source
    Manufacturer datasheet

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

    Datasheetfor NSR0340P2, opens in a new tab
  • ESD9C3.3ST5GSOD-923TVS diode, onsemiTVS diodeonsemi
    What it is
    TVS diode
    Maker
    onsemi
    Package
    SOD-923
    Pins
    2
    Details
    3.3V Unidirectional TVS Diode
    Source
    Published code list

    Is it dead? The meter test is below: TVS or ESD protection diode.

  • MM9D16VSOD-923Zener diode, Weitron TechnologyZener diodeWeitron Technology
    What it is
    Zener diode
    Maker
    Weitron Technology
    Package
    SOD-923
    Pins
    2
    Details
    Zener diode: 15.20..16.80V, Izt=5mA, Zzt=50, 200mW
    Source
    Published code list

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

  • NZ9F9V1STSOD-923Zener diode, onsemiZener diodeonsemi
    What it is
    Zener diode
    Maker
    onsemi
    Package
    SOD-923
    Pins
    2
    Details
    Zener diode: 8.85..9.23V, Izt=5mA, Zzt=30, 200mW
    Source
    Published code list

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

  • NZ9F16VTSOD-923Zener diode, onsemiZener diodeonsemi
    What it is
    Zener diode
    Maker
    onsemi
    Package
    SOD-923
    Pins
    2
    Details
    Zener diode: 15.20..16.80V, Izt=5mA, Zzt=50, 200mW
    Source
    Published code list

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

  • 7 more parts have no package on record. Nothing rules them out, so they stay.

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.

TVS or ESD protection diode

Diode range, from the protected line to ground, part lifted if you can.

Working, it reads

A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.

Dead, it reads

  • From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
  • A reading both ways on a one-way part: leaky.
  • A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.

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.

Schottky diode

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

Working, it reads

About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, 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.
  • A reading the wrong way round as well: leaky.
  • 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.

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

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.

Codes that begin with R

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 982 more parts.

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