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WhatSMDSign in

SMD marking

LZPin SMB

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 LZP in this package in our tables

TPSMB43A

What it is
TVS diode
Maker
Vishay
Package
SMB
Pins
2
Details
600 W TVS diode, unidirectional
Source
From the manufacturer's datasheet

Is it dead?

Diode range, from the protected line to ground, part lifted if you can.

Working, it reads

A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.

Dead, it reads

  • From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
  • A reading both ways on a one-way part: leaky.
  • A one-way part open both ways: failed open.
On the board:
On the board, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.

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

Datasheetfor TPSMB43A, opens in a new tab
1 more part has a code that begins with LZP

Codes that begin with LZP

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

  • INA186A5IDDFprinted 1ZPWCurrent sense amplifier, 8 pins, Texas Instruments

    Printed 1ZPW. 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
    Not recorded
    Pins
    8
    Details
    Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range, Current-Sense Amplifier With Enable
    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 INA186A5IDDF, opens in a new tab

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