SMD code 59A
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.
59A on a chip resistor
402 Ω
402 Ω resistor, 1%
EIA-96 precision code: 59 selects 4.02 from the E96 series and A multiplies by 100. These are 1% parts.
Check it with a meter
Lift one end and measure across it. A good one reads 402 Ω within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 402 Ω on the board is a fault. Open, or well above 402 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 402 Ω. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (SMA, SOD-123F, SOT-23), 59A is a part code instead. Those parts are listed below.
10 parts are printed 59A
Not sure which one you have?
Answer up to 4 quick questions and these 10 parts are ranked, with a meter test that settles it. It works on a dead part too.
CZRA4759B-HFSMAZener diode, 2 pins, ComchipZener diodeSMA2 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- 62 V 1 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
CZRMF4759A-HFSOD-123FZener diode, 2 pins, ComchipZener diodeSOD-123F2 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SOD-123F
- Pins
- 2
- Details
- 62 V 1 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
SMF4759ASOD-123FZener diode, 2 pins, LeiditechZener diodeSOD-123F2 pinsLeiditech
- What it is
- Zener diode
- Maker
- Leiditech
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
SML4759ASOD-123Zener diode, 2 pins, DOWOZener diodeSOD-1232 pinsDOWO
- What it is
- Zener diode
- Maker
- DOWO
- Package
- SOD-123
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
1SMA4759ASMAZener diode, 2 pins, First SilionZener diodeSMA2 pinsFirst Silion
- What it is
- Zener diode
- Maker
- First Silion
- Package
- SMA
- Pins
- 2
- Details
- Zener diode, VZ 62 V, 1 W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CMMT591ASOT-233 pins, CdiNot recordedSOT-233 pinsCdi
- What it is
- Not recorded
- Maker
- Cdi
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: GP, 40V, 1A, 500mW, B>300, >150MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
FMMT549ASOT-233 pins, Diodes IncorporatedNot recordedSOT-233 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- pnp 30V 1A hfe 150-500
- Source
- Published code list
Is it dead? The meter test is below: This part.
PML4759ASOD-123Zener diode, 2 pins, Plextron TechZener diodeSOD-1232 pinsPlextron Tech
- What it is
- Zener diode
- Maker
- Plextron Tech
- Package
- SOD-123
- Pins
- 2
- Details
- Zener diode: 62V±5%, Zzt=125, Ipm=70mA, 1W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
PSMA4759ASMAZener diode, 2 pins, Plextron TechZener diodeSMA2 pinsPlextron Tech
- What it is
- Zener diode
- Maker
- Plextron Tech
- Package
- SMA
- Pins
- 2
- Details
- Zener diode: 62V±5%, Zzt=125, Ipm=70mA, 1W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
SMA4759ASMAZener diode, 2 pins, Anova TechnologiesZener diodeSMA2 pinsAnova Technologies
- What it is
- Zener diode
- Maker
- Anova Technologies
- Package
- SMA
- Pins
- 2
- Details
- Zener diode, VZ 62 V, 1000 mW
- Source
- Published code list
Is it dead? The meter test is below: Zener 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.
This part
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
- Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
- Open between every pair of pins: failed open, or a part that reads open when working.
- 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.
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 59A
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 59A
For a marking with its end worn or burnt off. Each code has a page of its own.
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