SMD code QI- in SOT-323
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.
MM5Z2V7-Q1printed 01Zener diode, Formosa MicrosemiZener diodeNot recordedFormosa Microsemi
Printed 01 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MM5Z10V-Q1printed 0LZener diode, Formosa MicrosemiZener diodeNot recordedFormosa Microsemi
Printed 0L on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBZ5226BWSprinted D1Zener diode, Taitron ComponentsZener diodeNot recordedTaitron Components
Printed D1 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Zener diode
- Maker
- Taitron Components
- Package
- Not recorded
- Pins
- Not recorded
- Details
- SMD Zener Diodes (Three Terminals) - 200mW
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMSZ5226AHEprinted D1Zener diode, Galaxy MicroelectronicsZener diodeNot recordedGalaxy Microelectronics
Printed D1 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Zener diode
- Maker
- Galaxy Microelectronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 3.3V, 500mW, Surface Mount Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
NCP115AMX110printed QLLDO regulator, onsemiLDO regulatorNot recordedonsemi
Printed QL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LDO Regulator - High PSRR
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCP154MX150280printed DLLDO regulator, onsemiLDO regulatorNot recordedonsemi
Printed DL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage Regulator - Dual, Low I , Low Dropout, Dual Input
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCP160AMX350printed DLLDO regulator, onsemiLDO regulatorNot recordedonsemi
Printed DL on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LDO Regulator for RF and Analog Circuits - Ultra-Low Noise and High PSRR
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCX2200GMprinted q1Comparator, 6 pins, NXPComparator6 pinsNXP
Printed q1 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Comparator
- Maker
- NXP
- Package
- Not recorded
- Pins
- 6
- Details
- Low voltage comparator
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NCX2200GSprinted q1Comparator, 6 pins, NXPComparator6 pinsNXP
Printed q1 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Comparator
- Maker
- NXP
- Package
- Not recorded
- Pins
- 6
- Details
- Low voltage comparator
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NCX2200GWprinted q1Comparator, 5 pins, NXPComparator5 pinsNXP
Printed q1 on the part. Easy to misread as QI-. Check that character with a loupe before you order anything.
- What it is
- Comparator
- Maker
- NXP
- Package
- Not recorded
- Pins
- 5
- Details
- Low voltage comparator
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NX3L1G66GMprinted 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.
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.
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.
Zener diode
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
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, forward too: failed open.
- Holds well off its rated voltage on the supply test: drifted.
- A soft knee, or a voltage that creeps on the supply test: 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 meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
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.
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.
Did you find your part?
Open this in the search to correct a character or try another package.