SMD code 61A 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.
4 parts in SMA are printed 61A
Not sure which one you have?
Answer up to 4 quick questions and these 5 parts are ranked, with a meter test that settles it. It works on a dead part too.
CZRA4761B-HFSMAZener diode, 2 pins, ComchipZener diode2 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- 75 V 1 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
1SMA4761ASMAZener diode, 2 pins, First SilionZener diode2 pinsFirst Silion
- What it is
- Zener diode
- Maker
- First Silion
- Package
- SMA
- Pins
- 2
- Details
- Zener diode, VZ 75 V, 1 W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
PSMA4761ASMAZener diode, 2 pins, Plextron TechZener diode2 pinsPlextron Tech
- What it is
- Zener diode
- Maker
- Plextron Tech
- Package
- SMA
- Pins
- 2
- Details
- Zener diode: 75V±5%, Zzt=175, Ipm=60mA, 1W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
SMA4761ASMAZener diode, 2 pins, Anova TechnologiesZener diode2 pinsAnova Technologies
- What it is
- Zener diode
- Maker
- Anova Technologies
- Package
- SMA
- Pins
- 2
- Details
- Zener diode, VZ 75 V, 1000 mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
1 more part has no package on record. Nothing rules it out, so it stays.
MMBF4119Texas InstrumentsNot recordedNot recordedTexas Instruments
- What it is
- Not recorded
- Maker
- Texas Instruments
- Package
- Not recorded
- Pins
- Not recorded
- Details
- n-ch jfet ultra low i/p Ig
- Source
- Published code list
Is it dead? The meter test is below: JFET.
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.
JFET
Ohms range for drain to source, diode range for the gate, part lifted.
Working, it reads
Drain to source conducts both ways at a few hundred ohms, depending on the part, and some meters beep on it. The gate reads one junction to drain and to source, about 0.6 to 0.7 V, and open the other way.
Dead, it reads
- The gate the same both ways to drain or source, near 0 V with a continuous beep: gate shorted.
- Drain to source open: the channel has 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:
- Drain to source resistance varies from part to part. An identical part elsewhere on the board shows what is normal.
- Watch for:
- A good channel can beep like a short between drain and source. That is normal; the gate junction says whether it has failed.
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 61A
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
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