SMD code C306
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.
C306 on a chip capacitor
30 µF, 16 V
30 µF, 16 V tantalum capacitor
A moulded tantalum capacitor: 306 is the capacitance in picofarads (30 µF) and C is the rated-voltage code (16 V).
Check it with a meter
Lift one end and measure it on a capacitance range. A good one reads close to 30 µF. In circuit the meter also sees everything connected across it, so the reading means little until it is out. It is polarised: the band on the body marks the positive end, and a tantalum fitted backwards fails short, sometimes with a flame. A failed tantalum usually reads near 0 Ω both ways, often with a burnt or cracked body. A failed reading does not change what to fit: the marking still says 30 µF, 16 V. Fit the same capacitance at the same or a higher voltage.
On a transistor or diode body (SMC, SON, SMCG), C306 is a part code instead. Those parts are listed below.
Not sure which one you have?
Answer up to 4 quick questions and these 12 parts are ranked, with a meter test that settles it. It works on a dead part too.
The only part printed C306 in our tables
CMR3-06
- What it is
- Rectifier
- Maker
- Central Semiconductor
- Package
- SMC
- Pins
- 2
- Details
- Si-diode: GP, Rect, 600V, 3A, Vf<1.2V(3A)
- Source
- Published code list
Is it dead?
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
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.
- A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Was it this one?
Printed with a code easy to misread as C306
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 C306
For a marking with its end worn or burnt off. Each code has a page of its own.
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