SMD code 72C
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.
72C on a chip resistor
54.9 kΩ
54.9 kΩ resistor, 1%
EIA-96 precision code: 72 selects 5.49 from the E96 series and C multiplies by 10000. These are 1% parts.
Check it with a meter
Lift one end and measure across it. A good one reads 54.9 kΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 54.9 kΩ on the board is a fault. Open, or well above 54.9 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 54.9 kΩ. 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-353, SOT-23), 72C is a part code instead. Those parts are listed below.
Not sure which one you have?
Answer up to 4 quick questions and these 3 parts are ranked, with a meter test that settles it. It works on a dead part too.
The only part printed 72C in our tables
BAT721C
- What it is
- Schottky diode
- Maker
- Panjit
- Package
- SOT-23
- Pins
- 3
- Source
- From the manufacturer's datasheet
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, 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.
- A reading the wrong way round as well: leaky.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
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 72C
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 72C
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.