SMD code 911
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.
911 on a chip resistor
910 Ω
910 Ω resistor, 5%
91 followed by 1 zero. Three digits is normally the 5% series. The same marking also reads as 910 pF on a capacitor or 910 µH on an inductor, and nothing in the code says which; the body of the part does.
The same characters on another part
- 910 pF capacitor
- 910 µH inductor
Check it with a meter
Lift one end and measure across it. A good one reads 910 Ω within 5%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 910 Ω on the board is a fault. Open, or well above 910 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 910 Ω. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (SOT-23, SOT-89, SOT-223), 911 is a part code instead. Those parts are listed below.
The only part printed 911 in our tables
PBHV9110DA-AU
- What it is
- Transistor
- Maker
- Panjit
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor
- Source
- From the manufacturer's datasheet
Is it dead?
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: leaky.
- 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Codes that begin with 911
For a marking with its end worn or burnt off. Each code has a page of its own.
Open this in the search to correct a character or try another package.