SMD code R02
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.
R02 on a chip resistor
0.02 Ω
0.02 Ω resistor
The R stands in for the decimal point, which is how sub-ohm and fractional values are printed. The same marking also reads as 20 nH on an inductor or 0.02 pF on a capacitor, and nothing in the code says which; the body of the part does.
Other readings of the same characters, most likely first
- 20 nH inductor
- 0.02 pF capacitor
Check it with a meter
Lift one end and measure across it. A good one reads 0.02 Ω. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 0.02 Ω on the board is a fault. Open, or well above 0.02 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 0.02 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 (USP-6B, SOT-23, DFN), R02 is a part code instead. Those parts are listed below.
8 parts are printed R02
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.
ADR441ARMZMSOP-88 pins, Analog DevicesNot recordedMSOP-88 pinsAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- MSOP-8
- Pins
- 8
- Source
- Published code list
Is it dead? The meter test is below: This part.
DTC623TKSOT-23Digital transistor (NPN, resistors built in), 3 pins, ROHMDigital transistor (NPN, resistors built in)SOT-233 pinsROHM
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
DTC623TUSOT-323Digital transistor (NPN, resistors built in), 3 pins, ROHMDigital transistor (NPN, resistors built in)SOT-3233 pinsROHM
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
IXD1421AB02ER-GUSP-6CLDO regulator, 6 pins, IXYSLDO regulatorUSP-6C6 pinsIXYS
- What it is
- LDO regulator
- Maker
- IXYS
- Package
- USP-6C
- Pins
- 6
- Details
- Linear voltage regulator IC: LDO, Dual out, Vo1/Vo2=1.20V±20mV/1.50V±20mV, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
KSR1102SOT-233 pins, SamNot recordedSOT-233 pinsSam
- What it is
- Not recorded
- Maker
- Sam
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 20mW, 250MHz, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
XC6421AB02ER-GUSP-6CLDO regulator, 6 pins, TorexLDO regulatorUSP-6C6 pinsTorex
- What it is
- LDO regulator
- Maker
- Torex
- Package
- USP-6C
- Pins
- 6
- Details
- Linear voltage regulator IC: LDO, Dual out, Vo1/Vo2=1.20V±20mV/1.50V±20mV, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
XC9147A20DER-GUSP-6CDC-DC converter, 6 pins, TorexDC-DC converterUSP-6C6 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- USP-6C
- Pins
- 6
- Details
- DC/DC voltage converter IC: PWM st-up, 3.0MHz, 2.0V±2%, 1.4A, CrL, CL, +CE
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC9147A20DPR-GSOT-89-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-89-55 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-89-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM step-up, 3.0MHz, 2.0V±2%, 1.4A, CrL, CL, +CE
- 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.
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.
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.
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.
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 R02
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 R02
For a marking with its end worn or burnt off. Each code has a page of its own.
- R02061
- R0201
- R0211
- R0221
- R0231
- R0241
- R0251
- R0261
- R0271
- R0281
- R0291
- R02A1
- R02H1
- R02K1
- RD23G1
- RD26G1
- RD29G1
- RD23P2
- RD26P2
- RD29P2
- RD2A61
- RD2AC1
- RD2B61
- RD2BC1
- RD2C61
- RD2CC1
- RD2D61
- RD2DC1
- RD2E61
- RD2EC1
- RD2F61
- RD2FC1
Codes not listed here are printed on 28 more parts.
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