SMD code R1M
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.
R1M is an inductor marking
0.1 µH
0.1 µH inductor, 20%
The R stands in for the decimal point, in microhenries: 0.1 µH. SMD power inductors below 10 µH are printed this way. M is the tolerance, ±20%.
Check it with a meter
Measure it on an LCR meter, out of circuit. A good one reads close to 0.1 µH. An ohmmeter only shows the winding resistance, which is a fraction of an ohm on a good part and says nothing about the value; open circuit means the winding has failed. Shorted turns still read near 0 Ω on an ohmmeter, so only the LCR meter, or an identical part beside it, shows them. A failed reading does not change what to fit: the marking still says 0.1 µH.
On a transistor or diode body (SOT-23, SMA, SOT-89-5), R1M is a part code instead. Those parts are listed below.
9 parts are printed R1M
Not sure which one you have?
Answer up to 4 quick questions and these 9 parts are ranked, with a meter test that settles it. It works on a dead part too.
2SD2142SOT-23Transistor, 3 pins, SeCoSTransistorSOT-233 pinsSeCoS
- What it is
- Transistor
- Maker
- SeCoS
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
2SD2142KSOT-23Darlington transistor, 3 pins, ROHMDarlington transistorSOT-233 pinsROHM
- What it is
- Darlington transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- High-gain Amplifier Transistor (30V, 300mA)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Darlington transistor.
ADR06BKSZ-REEL7SOT-3535 pins, Analog DevicesNot recordedSOT-3535 pinsAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- SOT-353
- Pins
- 5
- Source
- Published code list
Is it dead? The meter test is below: This part.
CD214A-R11000SMARectifier, 2 pins, BournsRectifierSMA2 pinsBourns
- What it is
- Rectifier
- Maker
- Bourns
- Package
- SMA
- Pins
- 2
- Details
- Si-diode: Rect, 1000V, 1A, Vf<1.25V(1A), <12pF
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
MMSTA13SOT-23Darlington transistor, 3 pins, ROHMDarlington transistorSOT-233 pinsROHM
- What it is
- Darlington transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn-Darl: GP, 30V, 300mA, 300mW, B>5000, >125MHz
- Source
- Published code list
Is it dead? The meter test is below: Darlington transistor.
RS1010FLSOD-123F2 pins, Won-Top ElectronicsNot recordedSOD-123F2 pinsWon-Top Electronics
- What it is
- Not recorded
- Maker
- Won-Top Electronics
- Package
- SOD-123F
- Pins
- 2
- Details
- Diode: Fast recov. rectif, 1000V, 1A, Vf=1.3V(1A), 500ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
SSTA13SOT-23Darlington transistor, 3 pins, ROHMDarlington transistorSOT-233 pinsROHM
- What it is
- Darlington transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- MPSA13
- Source
- Published code list
Is it dead? The meter test is below: Darlington transistor.
XC6368F193MRSOT-23-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-23-55 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM/PFM st-up, 1.9V±2.5%, 200mA, 300kHz, +CE, soft start
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
1 more part has no package on record
ADR06BUJZ-REEL75 pins, Analog DevicesNot recordedNot recorded5 pinsAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- Not recorded
- Pins
- 5
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
Bipolar transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Darlington transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour reads about 0.6 to 0.75 V to the collector and about 1.1 to 1.4 V to the emitter, two junctions in series, and open the other way round. Collector to emitter reads open. Built-in resistors can change these readings.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
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.
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.
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.
Printed with a code easy to misread as R1M
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
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