SMD code QI- in SOT-23
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.
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.
Nothing is printed exactly QI-
These parts are printed with a character that is easy to misread as what you typed. The odd one out is marked on each.
15 parts have no package on record. Nothing rules them out, so they stay.
NX3L1G66GWprinted DLAnalog switch, 5 pins, NXPAnalog switch5 pinsNXP
Printed DL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Analog switch
- Maker
- NXP
- Package
- Not recorded
- Pins
- 5
- Details
- Low-ohmic single-pole single-throw analog switch
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NX3L1G66GW-Q100printed DLAnalog switch, 5 pins, NXPAnalog switch5 pinsNXP
Printed DL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Analog switch
- Maker
- NXP
- Package
- Not recorded
- Pins
- 5
- Details
- Low-ohmic single-pole single-throw analog switch
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NX3L1T5157GMprinted DIAnalog switch, 6 pins, NXPAnalog switch6 pinsNXP
Printed DI on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Analog switch
- Maker
- NXP
- Package
- Not recorded
- Pins
- 6
- Details
- Low-ohmic single-pole double-throw analog switch
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NX3V1G66GMprinted dLAnalog switch, 6 pins, NXPAnalog switch6 pinsNXP
Printed dL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Analog switch
- Maker
- NXP
- Package
- Not recorded
- Pins
- 6
- Details
- Low-ohmic single-pole single-throw analog switch
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NX3V1G66GWprinted dLAnalog switch, 5 pins, NXPAnalog switch5 pinsNXP
Printed dL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Analog switch
- Maker
- NXP
- Package
- Not recorded
- Pins
- 5
- Details
- Low-ohmic single-pole single-throw analog switch
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
RBR5L60Aprinted 01Schottky diode, ROHMSchottky diodeNot recordedROHM
Printed 01 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Schottky diode
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky Barrier Diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
RBR5L60ADDprinted 01Schottky diode, ROHMSchottky diodeNot recordedROHM
Printed 01 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Schottky diode
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky Barrier Diode (AEC-Q101 qualified)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
RQ6E045SNprinted QLN-channel MOSFET, ROHMN-channel MOSFETNot recordedROHM
Printed QL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- N-channel MOSFET
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Nch 30V 4.5A Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
RSQ045N03HZGprinted QLN-channel MOSFET, ROHMN-channel MOSFETNot recordedROHM
Printed QL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- N-channel MOSFET
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Nch 30V 4.5A Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
S-LP2301LT1Gprinted 01P-channel MOSFET, LRCP-channel MOSFETNot recordedLRC
Printed 01 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- P-channel MOSFET
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET, P-Channel, VDSS 20 V, VGS 8 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
SCS540DSTN-Cprinted D1Schottky diode, SeCoSSchottky diodeNot recordedSeCoS
Printed D1 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Schottky diode
- Maker
- SeCoS
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SM1901PSQGprinted 01P-channel MOSFET, Sinopower SemiconductorP-channel MOSFETNot recordedSinopower Semiconductor
Printed 01 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- P-channel MOSFET
- Maker
- Sinopower Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 20 V, 1 A P-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
TESDA6V0U40P1Q0printed DIESD protection diode, Taiwan SemiconductorESD protection diodeNot recordedTaiwan Semiconductor
Printed DI on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- ESD protection diode
- Maker
- Taiwan Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
TST015-105WSprinted DLSchottky diode, Taitron ComponentsSchottky diodeNot recordedTaitron Components
Printed DL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Schottky diode
- Maker
- Taitron Components
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky Barrier Diodes (Multiple Terminals)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
VS3V3BL1HSprinted DLESD protection diode, ROHMESD protection diodeNot recordedROHM
Printed DL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- ESD protection diode
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient Voltage Suppressor
- Source
- Manufacturer datasheet
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.
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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, 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.
- A reading the wrong way round as well: leaky.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
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
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
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.
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.
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.
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