SMD marking
3300
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.
3300 on a chip resistor
330 Ω
330 Ω resistor, 1%
330 followed by 0 zeros. Four digits is normally the 1% series.
Check it with a meter
Lift one end and measure across it. A good one reads 330 Ω within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 330 Ω on the board is a fault. Open, or well above 330 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 330 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, 3300 is a part code instead. Those parts are listed below.
The only part printed 3300 in our tables
TPS563300DRL
- What it is
- DC-DC converter
- Maker
- Texas Instruments
- Package
- Not recorded
- Pins
- 8
- Details
- 3.8-V to 28-V, 3-A Synchronous Buck Converter in SOT583 Package
- 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.
Open this in the search to correct a character or try another package.