SMD code S7s
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, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and S7 was searched.
68 parts are printed S7s
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.
BBY53-05SOT-233 pins, InfineonNot recordedSOT-233 pinsInfineon
- What it is
- Not recorded
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Details
- dual cc varicap
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
BF511SOT-233 pins, PhiNot recordedSOT-233 pinsPhi
- What it is
- Not recorded
- Maker
- Phi
- Package
- SOT-23
- Pins
- 3
- Details
- n-FET: VHF-LN, 2V, 30(7)mA, 250mW, 0,3pF
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
ELM7637HCBSOT-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: 3.7V±2%, +Reset PPO, Rdt=150ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM9747CABSOT-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: 4.7V±2.5%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM9747CBBSOT-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: 4.7V±2.5%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
FS2MSMB2 pins, FagNot recordedSMB2 pinsFag
- What it is
- Not recorded
- Maker
- Fag
- Package
- SMB
- Pins
- 2
- Details
- Si-diode: Rectifier, 1000V, 1,5A, Vf<1,1V(1,5A), 4µs
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
KN4A4LSOT-4163 pins, NEC ElectronicsNot recordedSOT-4163 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-416
- Pins
- 3
- Details
- Si-pnp-Digi: Sw, 60V, 100mA, 150mW, R1/R2=10k/4k7
- Source
- Published code list
Is it dead? The meter test is below: This part.
LD6919GU-21SOT-363LDO regulator, 6 pins, LeadtrendLDO regulatorSOT-3636 pinsLeadtrend
- What it is
- LDO regulator
- Maker
- Leadtrend
- Package
- SOT-363
- Pins
- 6
- Details
- Linear voltage regulator IC: LDO, Ultra-LN, Soft start, 2.1V±2%, 500mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
R1121N371BSOT-23-55 pins, Nisshinbo Micro DevicesNot recordedSOT-23-55 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-23-5
- Pins
- 5
- Details
- VR-IC: LDO, LN, CE, 3,7V±2%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
R3116Q241CSOT-343Voltage supervisor, 4 pins, RicohVoltage supervisorSOT-3434 pinsRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- SOT-343
- Pins
- 4
- Details
- Voltage detector IC: 2.4V±0.8%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
5 more parts have no package on record
ISL9021IRUPZ-T6 pins, RenesasNot recordedNot recorded6 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- Not recorded
- Pins
- 6
- Details
- equivalent [1.85V LDO]
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
PSM13PTRectifier, Chenmko EnterpriseRectifierNot recordedNot recordedChenmko Enterprise
- What it is
- Rectifier
- Maker
- Chenmko Enterprise
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Diode: Rectifier, S-fast, 200V, 800mA
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
R1131D171DNisshinbo Micro DevicesNot recordedNot recordedNot recordedNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- Not recorded
- Pins
- Not recorded
- Details
- VR-IC: LDO, CE, auto discharge, 1.7V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
R1163D171BNisshinbo Micro DevicesNot recordedNot recordedNot recordedNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- Not recorded
- Pins
- Not recorded
- Details
- VR-IC: LDO, CE, 1.7V±1.5%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
R1225N502DNisshinbo Micro DevicesNot recordedNot recordedNot recordedNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- Not recorded
- Pins
- Not recorded
- Details
- VR-IC: WFM/PWM step-down DC-DC converter, 5V, 500KHz
- 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.
PIN diode or varicap
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.6 to 0.9 V anode to cathode, 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.
- 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 varicap that has drifted in capacitance reads normal on a meter. Only a capacitance meter or the tuning itself shows it.
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.
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.
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.
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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