SMD code 5I
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.
15 parts are printed 5I
Not sure which one you have?
Answer up to 4 quick questions and these 15 parts are ranked, with a meter test that settles it. It works on a dead part too.
MMSD4148SOD-123Switching diode, 2 pins, Galaxy MicroelectronicsSwitching diodeSOD-1232 pinsGalaxy Microelectronics
- What it is
- Switching diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-123
- Pins
- 2
- Details
- 0.215A, 100V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SMMSD4148SOD-123Switching diode, 2 pins, onsemiSwitching diodeSOD-1232 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOD-123
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
TMMSD4148SOD-123Switching diode, 2 pins, Galaxy MicroelectronicsSwitching diodeSOD-1232 pinsGalaxy Microelectronics
- What it is
- Switching diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-123
- Pins
- 2
- Details
- 0.215A, 100V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
FT533IaSOT-23-5LDO regulator, 5 pins, Fremont Micro DevicesLDO regulatorSOT-23-55 pinsFremont Micro Devices
- What it is
- LDO regulator
- Maker
- Fremont Micro Devices
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 700mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FT533IbSOT-23-5LDO regulator, 5 pins, Fremont Micro DevicesLDO regulatorSOT-23-55 pinsFremont Micro Devices
- What it is
- LDO regulator
- Maker
- Fremont Micro Devices
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 700mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FT533IcSOT-23-5LDO regulator, 5 pins, Fremont Micro DevicesLDO regulatorSOT-23-55 pinsFremont Micro Devices
- What it is
- LDO regulator
- Maker
- Fremont Micro Devices
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 700mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FT533IdSOT-353LDO regulator, 5 pins, Fremont Micro DevicesLDO regulatorSOT-3535 pinsFremont Micro Devices
- What it is
- LDO regulator
- Maker
- Fremont Micro Devices
- Package
- SOT-353
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 700mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FT533IeSOT-353LDO regulator, 5 pins, Fremont Micro DevicesLDO regulatorSOT-3535 pinsFremont Micro Devices
- What it is
- LDO regulator
- Maker
- Fremont Micro Devices
- Package
- SOT-353
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 700mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FT533IfSOT-353LDO regulator, 5 pins, Fremont Micro DevicesLDO regulatorSOT-3535 pinsFremont Micro Devices
- What it is
- LDO regulator
- Maker
- Fremont Micro Devices
- Package
- SOT-353
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 700mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FT533IgSOT-23LDO regulator, 3 pins, Fremont Micro DevicesLDO regulatorSOT-233 pinsFremont Micro Devices
- What it is
- LDO regulator
- Maker
- Fremont Micro Devices
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 700mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FT533IhSOT-23LDO regulator, 3 pins, Fremont Micro DevicesLDO regulatorSOT-233 pinsFremont Micro Devices
- What it is
- LDO regulator
- Maker
- Fremont Micro Devices
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 700mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FT533IiSOT-89LDO regulator, 3 pins, Fremont Micro DevicesLDO regulatorSOT-893 pinsFremont Micro Devices
- What it is
- LDO regulator
- Maker
- Fremont Micro Devices
- Package
- SOT-89
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 700mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FUF1DWSOD-123W2 pins, Fagor ElectronicaNot recordedSOD-123W2 pinsFagor Electronica
- What it is
- Not recorded
- Maker
- Fagor Electronica
- Package
- SOD-123W
- Pins
- 2
- Details
- Diode: U-fast recov. rectif, 200V, 1A, Vf<1.3V(1A), 50ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
MC10EP05MNDFN8 pins, onsemiNot recordedDFN8 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- 8
- Source
- Published code list
Is it dead? The meter test is below: This part.
MMSD4148T1SOD-1232 pins, onsemiNot recordedSOD-1232 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOD-123
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
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.
Printed with a code easy to misread as 5I
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 76 more parts.
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