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SMD code NI

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.

Not sure which one you have?

Answer up to 4 quick questions and these 22 parts are ranked, with a meter test that settles it. It works on a dead part too.

The only part printed NI in our tables

ESDUNI5V6I1

What it is
ESD protection diode
Maker
JSCJ
Package
SOD-323
Pins
2
Details
ESD protection diode, VRWM 5.6 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
, 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 ESDUNI5V6I1, opens in a new tab

Printed with a code easy to misread as NI

One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.

Codes that begin with NI

For a marking with its end worn or burnt off. Each code has a page of its own.

Codes not listed here are printed on 22 more parts.

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