SMD code S5D
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.
19 parts are printed S5D
Not sure which one you have?
Answer up to 4 quick questions and these 19 parts are ranked, with a meter test that settles it. It works on a dead part too.
FM503-BFSMBFRectifier, 2 pins, Formosa MicrosemiRectifierSMBF2 pinsFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- SMBF
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
FM503-CFSMCFRectifier, 2 pins, Formosa MicrosemiRectifierSMCF2 pinsFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- SMCF
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
QG503BR-CSMBRectifier, 2 pins, SeCoSRectifierSMB2 pinsSeCoS
- What it is
- Rectifier
- Maker
- SeCoS
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S5DBSMBRectifier, 2 pins, YFWRectifierSMB2 pinsYFW
- What it is
- Rectifier
- Maker
- YFW
- Package
- SMB
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S5DB-HFSMBRectifier, 2 pins, ComchipRectifierSMB2 pinsComchip
- What it is
- Rectifier
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- 200 V, 5 A rectifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S5DCSMCRectifier, 2 pins, YFWRectifierSMC2 pinsYFW
- What it is
- Rectifier
- Maker
- YFW
- Package
- SMC
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S5DC-HFSMCRectifier, 2 pins, ComchipRectifierSMC2 pinsComchip
- What it is
- Rectifier
- Maker
- Comchip
- Package
- SMC
- Pins
- 2
- Details
- 200 V, 5 A rectifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
ECL112114B1RSOT-23LDO regulator, 3 pins, E-CMOSLDO regulatorSOT-233 pinsE-CMOS
- What it is
- LDO regulator
- Maker
- E-CMOS
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 1.4V±2%, 250mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
LN5001142MSOT-23-5LDO regulator, 5 pins, Shanghai Natlinear ElectronicsLDO regulatorSOT-23-55 pinsShanghai Natlinear Electronics
- What it is
- LDO regulator
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 1.4V±1%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
MMBD914SOT-23Switching diode, 3 pins, InfineonSwitching diodeSOT-233 pinsInfineon
- What it is
- Switching diode
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Details
- Surface-mount fast switching diode
- Source
- An older or alternative marking, from a published code list
Is it dead? The meter test is below: Silicon diode.
S-1721E1828-M6T1SOT-23-66 pins, ABLICNot recordedSOT-23-66 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SOT-23-6
- Pins
- 6
- Details
- equivalent [1.8/2.8V Dual LDO]
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1721E1828-M6T1xSOT-23-6LDO regulator, 6 pins, Seiko InstrumentsLDO regulatorSOT-23-66 pinsSeiko Instruments
- What it is
- LDO regulator
- Maker
- Seiko Instruments
- Package
- SOT-23-6
- Pins
- 6
- Details
- Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.8V/2.8V±1.0%, 150mA, ±CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
3 more parts have no package on record
ECL112114BFRLDO regulator, E-CMOSLDO regulatorNot recordedNot recordedE-CMOS
- What it is
- LDO regulator
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 1.4V±2%, 250mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1721E1828-I6T16 pins, ABLICNot recordedNot recorded6 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- Not recorded
- Pins
- 6
- Details
- equivalent [1.8/2.8V Dual LDO]
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1721E1828-I6T1xLDO regulator, Seiko InstrumentsLDO regulatorNot recordedNot recordedSeiko Instruments
- What it is
- LDO regulator
- Maker
- Seiko Instruments
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.8V/2.8V±1.0%, 150mA, ±CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
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.
Printed with a code easy to misread as S5D
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 12 more parts.
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