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SMD code 37R

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.

37R on a chip resistor

37 Ω

37 Ω resistor

A trailing R marks the value in ohms, with nothing after the decimal point. The same marking also reads as 2.37 Ω, and nothing in the code says which; the body of the part does.

Other readings of the same characters, most likely first

  • 2.37 Ω resistor, 1%

Check it with a meter

Lift one end and measure across it. A good one reads 37 Ω. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 37 Ω on the board is a fault. Open, or well above 37 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 37 Ω. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.

On a transistor or diode body (SOT-23-5, SOT-23-6), 37R is a part code instead. Those parts are listed below.

4 parts are printed 37R

Not sure which one you have?

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

  • LD7537RGLSOT-23-6AC-DC controller, 6 pins, LeadtrendAC-DC controllerSOT-23-66 pinsLeadtrend
    What it is
    AC-DC controller
    Maker
    Leadtrend
    Package
    SOT-23-6
    Pins
    6
    Details
    Multi-Mode PWM Controller of Flyback with Integrated BNI/BNO and Protection
    Source
    Manufacturer datasheet

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

    Datasheetfor LD7537RGL, opens in a new tab
  • XC6104B323MRSOT-23-5Voltage supervisor, 5 pins, TorexVoltage supervisorSOT-23-55 pinsTorex
    What it is
    Voltage supervisor
    Maker
    Torex
    Package
    SOT-23-5
    Pins
    5
    Details
    CMOS-IC: VDet 2.3V, 5%, Hst, ±Reset PPO, Wt=100ms, Rt=25ms
    Source
    Published code list

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

  • 2 more parts have no package on record
    • 2SC4094RFB4 pins, RenesasNot recordedNot recorded4 pinsRenesas
      What it is
      Not recorded
      Maker
      Renesas
      Package
      Not recorded
      Pins
      4
      Source
      Published code list

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

    • GR8837RCGNot recordedNot recordedNot recordedNot recorded
      What it is
      Not recorded
      Maker
      Not recorded
      Package
      Not recorded
      Pins
      Not recorded
      Details
      PWM controller
      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.

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.

Printed with a code easy to misread as 37R

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

Codes that begin with 37R

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

Did you find your part?

Open this in the search to correct a character or try another package.