SMD code RQ2

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.

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The only part printed RQ2 in our tables

SMP1330-005LF

What it is: PIN diode
Maker: Skyworks
Package: SOT-23
Pins: 3
Details: SMP1330 Series: Plastic Packaged Limiter Diodes
Source: Manufacturer datasheet

Is it dead?

Diode range, part lifted or one leg off the pad. Red probe on the anode.

Working, it reads

About 0.6 to 0.9 V anode to cathode, and open the other way.

Dead, it reads

The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways: failed open.

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.
Watch for:: A varicap that has drifted in capacitance reads normal on a meter. Only a capacitance meter or the tuning itself shows it.

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

Datasheet

Was it this one?

Printed with a code easy to misread as RQ2

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 RQ2

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 28 more parts.

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