SMD code R1p
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.
The last letter, p, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and R1 was searched.
77 parts are printed R1p
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.
BZD27C220PWSOD-123WZener diode, 2 pins, Taiwan SemiconductorZener diodeSOD-123W2 pinsTaiwan Semiconductor
- What it is
- Zener diode
- Maker
- Taiwan Semiconductor
- Package
- SOD-123W
- Pins
- 2
- Details
- Zener diode: 208..233V, Zzt=430, Izt=5mA, 1W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
BZX84-C4V7TSOT-5233 pins, Diodes IncorporatedNot recordedSOT-5233 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-523
- Pins
- 3
- Details
- Z-diode: 4.7V±5%, 150mW
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
BZX84C4V7TSOT-523Zener diode, 3 pins, Diodes IncorporatedZener diodeSOT-5233 pinsDiodes Incorporated
- What it is
- Zener diode
- Maker
- Diodes Incorporated
- Package
- SOT-523
- Pins
- 3
- Details
- zener 150mW 4.7V
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CHDTA113TKPTSOT-23Digital transistor (PNP, resistors built in), 3 pins, Chenmko EnterpriseDigital transistor (PNP, resistors built in)SOT-233 pinsChenmko Enterprise
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- Chenmko Enterprise
- Package
- SOT-23
- Pins
- 3
- Details
- PNP transistor: Sw, 50V, 100mA, 250MHz, R1=1k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
CMOZ43LSOD-523Zener diode, 2 pins, Central SemiconductorZener diodeSOD-5232 pinsCentral Semiconductor
- What it is
- Zener diode
- Maker
- Central Semiconductor
- Package
- SOD-523
- Pins
- 2
- Details
- Z-diode: 40.85..45.15V, Izt=0.25mA, Zzt=250Ω, 250mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CZRH3-55C4V7SOT-523Zener diode, 3 pins, ComchipZener diodeSOT-5233 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SOT-523
- Pins
- 3
- Details
- Zener diode: 4.7..5.0V, Zzt=80, Izt=5mA, 150mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
D71Y.8T1SOT-893 pins, GenNot recordedSOT-893 pinsGen
- What it is
- Not recorded
- Maker
- Gen
- Package
- SOT-89
- Pins
- 3
- Details
- Si-pnp: AF, 35V, 800mA
- Source
- Published code list
Is it dead? The meter test is below: This part.
ELM7331NBC2ASOT-353Voltage supervisor, 5 pins, ELM TechnologyVoltage supervisorSOT-3535 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-353
- Pins
- 5
- Details
- Voltage detector IC: 3.1V±1.2%, -Reset ODO, -MR
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM7631LCBSOT-23Voltage supervisor, 3 pins, ELM TechnologyVoltage supervisorSOT-233 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 3.1V±2%, -Reset PPO, Rdt=150ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM9731CABSOT-89Voltage supervisor, 3 pins, ELM TechnologyVoltage supervisorSOT-893 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-89
- Pins
- 3
- Details
- Voltage detector IC: 3.1V±2.5%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM9731CBBSOT-23Voltage supervisor, 3 pins, ELM TechnologyVoltage supervisorSOT-233 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 3.1V±2.5%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
FP6802-39CS3GSOT-23Voltage supervisor, 3 pins, FitipowerVoltage supervisorSOT-233 pinsFitipower
- What it is
- Voltage supervisor
- Maker
- Fitipower
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 3.9V±-2%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
FS1ASMA2 pins, FagNot recordedSMA2 pinsFag
- What it is
- Not recorded
- Maker
- Fag
- Package
- SMA
- Pins
- 2
- Details
- Si-diode: Rectifier, 50V, 1A, Vf<1,1V(1A)
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
HSMS-8101SOT-233 pins, BroadcomNot recordedSOT-233 pinsBroadcom
- What it is
- Not recorded
- Maker
- Broadcom
- Package
- SOT-23
- Pins
- 3
- Details
- 10-14GHz schottky mixer
- Source
- Published code list
Is it dead? The meter test is below: Schottky diode.
1 more part has no package on record
DW84C4V7NND03Zener diode, JSCJZener diodeNot recordedNot recordedJSCJ
- What it is
- Zener diode
- Maker
- JSCJ
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 4.7V±10%, If=10mA, 150mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
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.
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.
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.
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.
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.
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.
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.
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