Skip to content
WhatSMDSign in

SMD marking

1AB

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 1AB in our tables

TMP112NAIDRL

What it is
Temperature sensor
Maker
Texas Instruments
Package
Not recorded
Pins
6
Details
High-Accuracy, Low-Power, Digital Temperature Sensors With SMBus and Two-Wire Serial Interface in SOT563 and X2SON...
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 TMP112NAIDRL, opens in a new tab
2 more parts have codes that begin with 1AB

Codes that begin with 1AB

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

Current sense amplifier, all SOT-23-5, 5 pins, all Texas Instruments.

  • INA180B2IDBVprinted 1ABDSOT-23-5

    Printed 1ABD. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Current sense amplifier
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    INAx180 Low- and High-Side Voltage Output, Current-Sense Amplifiers
    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 INA180B2IDBV, opens in a new tab
  • INA180A2IDBVprinted 1A8DSOT-23-5

    Printed 1A8D. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Current sense amplifier
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    INAx180 Low- and High-Side Voltage Output, Current-Sense Amplifiers
    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 INA180A2IDBV, opens in a new tab

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