SMD code ZWJ in QFN
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 and published code lists.
2 parts in QFN are printed ZWJ
Not sure which one you have?
Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.
all QFN, all Texas Instruments. What differs:
PCF8574QFNNot recorded
- What it is
- Not recorded
- Maker
- Texas Instruments
- Package
- QFN
- Pins
- Not recorded
- Details
- Remote 8-Bit I/O Expander for I 2C Bus
- Source
- Published code list
Is it dead? The meter test is below: This part.
PCF8574RGTQFN16 pins16 pins
- What it is
- Not recorded
- Maker
- Texas Instruments
- Package
- QFN
- Pins
- 16
- Source
- Published code list
Is it dead? The meter test is below: This part.
Is it dead? One meter test per kind
Parts of the same kind are tested the same way, so each test is here once. Each part above points to its own.
This part
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
- Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
- Open between every pair of pins: failed open, or a part that reads open when working.
- On the board
- this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed with a code easy to misread as ZWJ
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
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