SMD code JR in SMAF
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.
1 part in SMAF is printed JR
Not sure which one you have?
Answer up to 4 quick questions and these 14 parts are ranked, with a meter test that settles it. It works on a dead part too.
P4SMAFJ40ASMAFTVS diode, Blue RocketTVS diodeBlue Rocket
- What it is
- TVS diode
- Maker
- Blue Rocket
- Package
- SMAF
- Pins
- 2
- Details
- TVS diode, unidirectional
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
13 more parts have no package on record. Nothing rules them out, so they stay.
FAN48630BUC34XDC-DC converter, onsemiDC-DC converteronsemi
- What it is
- DC-DC converter
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Synchronous Regulator with Bypass Mode, , TINYBOOST 2.5 MHz, 1500 mA
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
RQ5E035ATP-channel MOSFET, ROHMP-channel MOSFETROHM
- What it is
- P-channel MOSFET
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Pch -30V -3.5A Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
RQ6E035ATP-channel MOSFET, ROHMP-channel MOSFETROHM
- What it is
- P-channel MOSFET
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Pch -30V -3.5A Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
SM4F40A-ATTVS diode, WayonTVS diodeWayon
- What it is
- TVS diode
- Maker
- Wayon
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMF40A-ATTVS diode, WayonTVS diodeWayon
- What it is
- TVS diode
- Maker
- Wayon
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
2SJ580Sanyo ElectricNot recordedSanyo Electric
- What it is
- Not recorded
- Maker
- Sanyo Electric
- Package
- Not recorded
- Pins
- Not recorded
- Details
- p-MOS*-e: Sw, U-Speed, LogL, 60V, 1,8A, 1.5W, <0.4Ω(1A), 9/38ns
- Source
- Published code list
Is it dead? The meter test is below: This part.
BU4848FVoltage supervisor, ROHMVoltage supervisorROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4,8V, -Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BU4848FWEVoltage supervisor, ROHMVoltage supervisorROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4,8V, -Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BU4848GVoltage supervisor, ROHMVoltage supervisorROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4,8V, -Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IDT74ALVCH1G79DYIntegrated Device TechnologyNot recordedIntegrated Device Technology
- What it is
- Not recorded
- Maker
- Integrated Device Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Positive edge-triggered D-type flip-flop
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
LT4ME40ATVS diode, Lite-On SemiconductorTVS diodeLite-On Semiconductor
- What it is
- TVS diode
- Maker
- Lite-On Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=40V, Vbr=44.4..49.1V, Ipp=6.2A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P2SMSJ40ATVS diode, YeashinTVS diodeYeashin
- What it is
- TVS diode
- Maker
- Yeashin
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=40V, Vbr=44.4..49.1V, Ipp=3.1A, 200W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMF4L40AQTVS diode, Diodes IncorporatedTVS diodeDiodes Incorporated
- What it is
- TVS diode
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=40V, Vbr=44.4..49.1V, Ipp=6.2A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection 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.
TVS or ESD protection diode
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
- From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
- A reading both ways on a one-way part: leaky.
- A one-way part open both ways: failed open.
- On the board
- , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
- Compare:
- The same part on the next line or connector pin is the healthy reading to compare with.
- Watch for:
- A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
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.
P-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the drain, black on the source: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
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. Often all three pins end up shorted together.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, so gate to source reads that resistor, which 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.
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.
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