SMD code M97
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.
M97 on a chip resistor
970 kΩ
970 kΩ resistor
The M is both the decimal point and the multiplier: 970 kΩ.
Check it with a meter
Lift one end and measure across it. A good one reads 970 kΩ. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 970 kΩ on the board is a fault. Open, or well above 970 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 970 kΩ. 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, SOT-89, SOT-23-6), M97 is a part code instead. Those parts are listed below.
8 parts are printed M97
Not sure which one you have?
Answer up to 4 quick questions and these 8 parts are ranked, with a meter test that settles it. It works on a dead part too.
BFR101ASOT-1434 pinsSOT-1434 pinsNot recorded
- What it is
- Not recorded
- Maker
- Not recorded
- Package
- SOT-143
- Pins
- 4
- Details
- FET n-type: GP, 30V, 20mA, 200mW, Idss=0.2..1.5mA, Up<1V
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
LN61FN2952MSOT-233 pins, Shanghai Natlinear ElectronicsSOT-233 pinsShanghai Natlinear Electronics
- What it is
- Voltage supervisor
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.9V±2%, +Reset ODO, Rdt=50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
LN61FN2952PSOT-893 pins, Shanghai Natlinear ElectronicsSOT-893 pinsShanghai Natlinear Electronics
- What it is
- Voltage supervisor
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-89
- Pins
- 3
- Details
- Voltage detector IC: 2.9V±2%, +Reset ODO, 50ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3121N036GSOT-23-66 pins, RicohSOT-23-66 pinsRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- SOT-23-6
- Pins
- 6
- Details
- Voltage detector IC: 3.6V±1.5%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC61FN2952MSOT-233 pins, TorexSOT-233 pinsTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 2,9V, Reset Open drain output, 50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC61FN2952PSOT-893 pins, TorexSOT-893 pinsTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- SOT-89
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 2,9V, Reset Open drain output, 50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC61HN2952MRSOT-233 pins, TorexSOT-233 pinsTorex
- What it is
- Voltage supervisor
- Maker
- Torex
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.9V±2%, -Reset ODO, Rdt=1..50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
1 more part has no package on record
ADCMP670-1YUJZ-RL76 pins, Analog DevicesNot recorded6 pinsAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- Not recorded
- Pins
- 6
- 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.
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.
MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and is not a fault. Lift a leg to be sure.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
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.
Did you find your part?
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