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WhatSMDSign in

SMD marking

15P

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.

15P on a chip capacitor

15 pF

15 pF capacitor

The p is both the decimal point and the unit: 15 pF.

Check it with a meter

Lift one end and measure it on a capacitance range. A good one reads close to 15 pF. In circuit the meter also sees everything connected across it, so the reading means little until it is out. A failed one usually reads near 0 Ω, or a steady low resistance, on the ohms range, often from a crack. On the board a shorted capacitor shorts its whole rail. A failed reading does not change what to fit: the marking still says 15 pF.

On a transistor or diode body (SOT-23-5), 15P is a part code instead. Those parts are listed below.

The only part printed 15P in our tables

ESDQ15VFD1

What it is
ESD protection diode
Maker
JSCJ
Package
Not recorded
Pins
Not recorded
Details
ESD protection diode, VRWM 15 V
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 ESDQ15VFD1, opens in a new tab
1 more part has a code that begins with 15P

Codes that begin with 15P

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

  • LM321LVIDBVprinted 1SPFSOT-23-5Operational amplifier, 5 pins, Texas Instruments

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

    What it is
    Operational amplifier
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    Industry Standard, Low Voltage Operational 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 LM321LVIDBV, opens in a new tab

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