SMD code 4758
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.
7 parts are printed 4758
Not sure which one you have?
Answer up to 4 quick questions and these 7 parts are ranked, with a meter test that settles it. It works on a dead part too.
Zener diode, 2 pins. What differs:
DL4758MELFHottechMELFHottech
- What it is
- Zener diode
- Maker
- Hottech
- Package
- MELF
- Pins
- 2
- Details
- Zener diode, VZ 56 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
GSF1N4758SOD-123FGood-ArkSOD-123FGood-Ark
- What it is
- Zener diode
- Maker
- Good-Ark
- Package
- SOD-123F
- Pins
- 2
- Details
- Zener diode, VZ 56 V, 1 W
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
SMAF4758SMAFGalaxy MicroelectronicsSMAFGalaxy Microelectronics
- What it is
- Zener diode
- Maker
- Galaxy Microelectronics
- Package
- SMAF
- Pins
- 2
- Details
- 56V, 5%, Surface Mount Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
SMAJ4758SMAGalaxy MicroelectronicsSMAGalaxy Microelectronics
- What it is
- Zener diode
- Maker
- Galaxy Microelectronics
- Package
- SMA
- Pins
- 2
- Details
- 56V, 5%, Surface Mount Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
TSMAJ4758SMAGalaxy MicroelectronicsSMAGalaxy Microelectronics
- What it is
- Zener diode
- Maker
- Galaxy Microelectronics
- Package
- SMA
- Pins
- 2
- Details
- 56V, 5%, Surface Mount Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
SMF4758SOD-123FYangjie Electronic TechSOD-123FYangjie Electronic Tech
- What it is
- Zener diode
- Maker
- Yangjie Electronic Tech
- Package
- SOD-123F
- Pins
- 2
- Details
- Zener diode: 56.0V±5%, Izt=4.5mA, Zzt=110.0, 1W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
SML4758SMAEIC SemiconductorSMAEIC Semiconductor
- What it is
- Zener diode
- Maker
- EIC Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- 56 V Zener diode
- 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.
Codes that begin with 4758
For a marking with its end worn or burnt off. Each code has a page of its own.
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