SMD code 64A in SMA
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.
6 parts in SMA are printed 64A
Not sure which one you have?
Answer up to 4 quick questions and these 8 parts are ranked, with a meter test that settles it. It works on a dead part too.
CZRA4764B-HFSMAZener diode, 2 pins, ComchipZener diode2 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- 100 V 1 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
1SMA4764ASMAZener diode, 2 pins, First SilionZener diode2 pinsFirst Silion
- What it is
- Zener diode
- Maker
- First Silion
- Package
- SMA
- Pins
- 2
- Details
- Zener diode, VZ 100 V, 1 W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
P4SMAJ64ASMATVS diode, 2 pins, YeashinTVS diode2 pinsYeashin
- What it is
- TVS diode
- Maker
- Yeashin
- Package
- SMA
- Pins
- 2
- Details
- TVS: 64V, 3.9A, 400W (1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
PSMA4764ASMAZener diode, 2 pins, Plextron TechZener diode2 pinsPlextron Tech
- What it is
- Zener diode
- Maker
- Plextron Tech
- Package
- SMA
- Pins
- 2
- Details
- Zener diode: 100V±5%, Zzt=350, Ipm=45mA, 1W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
SMA4764ASMAZener diode, 2 pins, Anova TechnologiesZener diode2 pinsAnova Technologies
- What it is
- Zener diode
- Maker
- Anova Technologies
- Package
- SMA
- Pins
- 2
- Details
- Zener diode, VZ 100 V, 1000 mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
SMAJ64ASMATVS diode, 2 pins, SynSemiTVS diode2 pinsSynSemi
- What it is
- TVS diode
- Maker
- SynSemi
- Package
- SMA
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
2 more parts have no package on record. Nothing rules them out, so they stay.
3PMT64ATVS diode, Microsemi Integrated Products DivisionTVS diodeNot recordedMicrosemi Integrated Products Division
- What it is
- TVS diode
- Maker
- Microsemi Integrated Products Division
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vvm=64V, Vbr=71.1V, Vcl=103.0V, 14.6A, 1500W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
UMA64ATVS diode, Microsemi Integrated Products DivisionTVS diodeNot recordedMicrosemi Integrated Products Division
- What it is
- TVS diode
- Maker
- Microsemi Integrated Products Division
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=64V, Vbr=71.1..103.0V, 4.9A, 500W(1ms)
- Source
- Published code list
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.
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.
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.
Printed with a code easy to misread as 64A
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with 64A
For a marking with its end worn or burnt off. Each code has a page of its own.
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