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18 parts are printed A6. 25 printed with a similar-looking code.
Not sure which one you have?
Answer up to 4 quick questions and these 18 parts are ranked, with a meter test that settles it. It works on a dead part too.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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 dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
One character differs, and it is one that is easy to confuse under a lamp. The odd one out is marked on each.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
Diode range, part lifted or its base leg off the pad.
Working, it reads
Black probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
Diode range, part lifted or its base leg off the pad.
Working, it reads
Black probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.
Working, it reads
Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.
Dead, it reads
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AC on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed AG on the part. Easy to misread as A6. Check that character with a loupe before you order anything.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
For a marking with its end worn or burnt off. Each one shows its full printed code.
Printed A68. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
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 dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed A68. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
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 dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed A69. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
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 dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed A69. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
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 dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed A63A. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
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 dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed A63A. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
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 dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed A61. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
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
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.