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WhatSMDSign in

SMD marking

8KBin SOT-563

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.

The only part printed 8KB in this package in our tables

PJX138K

What it is
MOSFET
Maker
Panjit
Package
SOT-563
Pins
6
Source
From the manufacturer's datasheet

Is it dead?

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

  • Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
  • The gate reads low to source or drain: gate shorted.
  • No body diode at all: failed open.
On the board:
On the board the gate usually has a resistor to the source, which reads as that resistor and is not a fault. Lift a leg to be sure.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

Datasheetfor PJX138K, opens in a new tab
3 more parts have codes that begin with 8KB

Codes that begin with 8KB

For a marking with its end worn or burnt off. Each one shows its full printed code.

DC-DC converter, all Alpha & Omega Semiconductor.

  • AOZ2263BQI-15printed BKBF

    Printed BKBF. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    DC-DC converter
    Maker
    Alpha & Omega Semiconductor
    Package
    Not recorded
    Pins
    Not recorded
    Details
    Synchronous buck regulator
    Source
    From the manufacturer's datasheet

    Is it dead?

    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 pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor AOZ2263BQI-15, opens in a new tab
  • AOZ2263BQI-20printed BKBN

    Printed BKBN. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    DC-DC converter
    Maker
    Alpha & Omega Semiconductor
    Package
    Not recorded
    Pins
    Not recorded
    Details
    Synchronous buck regulator
    Source
    From the manufacturer's datasheet

    Is it dead?

    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 pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor AOZ2263BQI-20, opens in a new tab
  • AOZ2263BQI-28printed BKBY

    Printed BKBY. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    DC-DC converter
    Maker
    Alpha & Omega Semiconductor
    Package
    Not recorded
    Pins
    Not recorded
    Details
    Synchronous buck regulator
    Source
    From the manufacturer's datasheet

    Is it dead?

    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 pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor AOZ2263BQI-28, opens in a new tab

Open this in the search to correct a character or try another package.