SMD code 7 in WLCSP
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.
9 parts in WLCSP are printed 7
Not sure which one you have?
Answer up to 4 quick questions and these 32 parts are ranked, with a meter test that settles it. It works on a dead part too.
APL3527AWLCSPLoad switch, AnpecLoad switchAnpec
- What it is
- Load switch
- Maker
- Anpec
- Package
- WLCSP
- Pins
- Not recorded
- Details
- Ultra-Low On-Resistance, Power Load Switch with Soft Start
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
APL3527BWLCSPLoad switch, AnpecLoad switchAnpec
- What it is
- Load switch
- Maker
- Anpec
- Package
- WLCSP
- Pins
- Not recorded
- Details
- Ultra-Low On-Resistance, Power Load Switch with Soft Start
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
APL3527CWLCSPLoad switch, AnpecLoad switchAnpec
- What it is
- Load switch
- Maker
- Anpec
- Package
- WLCSP
- Pins
- Not recorded
- Details
- Ultra-Low On-Resistance, Power Load Switch with Soft Start
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
APL3527DWLCSPLoad switch, AnpecLoad switchAnpec
- What it is
- Load switch
- Maker
- Anpec
- Package
- WLCSP
- Pins
- Not recorded
- Details
- Ultra-Low On-Resistance, Power Load Switch with Soft Start
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
APL3527EWLCSPLoad switch, AnpecLoad switchAnpec
- What it is
- Load switch
- Maker
- Anpec
- Package
- WLCSP
- Pins
- Not recorded
- Details
- Ultra-Low On-Resistance, Power Load Switch with Soft Start
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
APL3527FWLCSPLoad switch, AnpecLoad switchAnpec
- What it is
- Load switch
- Maker
- Anpec
- Package
- WLCSP
- Pins
- Not recorded
- Details
- Ultra-Low On-Resistance, Power Load Switch with Soft Start
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
APL3527GWLCSPLoad switch, AnpecLoad switchAnpec
- What it is
- Load switch
- Maker
- Anpec
- Package
- WLCSP
- Pins
- Not recorded
- Details
- Ultra-Low On-Resistance, Power Load Switch with Soft Start
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
APL3527HWLCSPLoad switch, AnpecLoad switchAnpec
- What it is
- Load switch
- Maker
- Anpec
- Package
- WLCSP
- Pins
- Not recorded
- Details
- Ultra-Low On-Resistance, Power Load Switch with Soft Start
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
TPQ051007-WS4RWLCSP3PEAKNot recorded3PEAK
- What it is
- Not recorded
- Maker
- 3PEAK
- Package
- WLCSP
- Pins
- Not recorded
- Details
- 0.9-V to 5.5-V VIN, 600-mA Synchronous Step-up Regulator
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
6 more parts have no package on record. Nothing rules them out, so they stay.
AOCA24108EDual N-channel MOSFET, Alpha & Omega SemiconductorDual N-channel MOSFETAlpha & Omega Semiconductor
- What it is
- Dual N-channel MOSFET
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Common-drain dual N-channel battery MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET pair.
AOZ8S203BLS-03ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection for high-speed interfaces
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
AOZ8S203BLS-05ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection for high-speed interfaces
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
AOZ8S205BLS-24ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection for high-speed interfaces
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
AOZ8839DI-03ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection for high-speed interfaces
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
CDSP400-HFSwitching diode, ComchipSwitching diodeComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 90 V, 100 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon 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.
Load switch
Voltage, board powered, black probe on ground.
Working, it reads
Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.
Dead, it reads
- Output at the input voltage while switched off: the pass element has shorted.
- Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
- On the board:
- An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
- 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 pinout and whether the enable is active high or low differ between parts. The datasheet gives both.
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.
N-channel MOSFET pair
Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.
Working, it reads
Red probe on the source, black on the drain: 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. A drain short can be the load. 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.
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.
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.
Printed with a code easy to misread as 7
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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