SMD code 668K
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.
668K is a capacitor marking
0.66 pF
0.66 pF capacitor, 10%
66 followed by the multiplier 8, in picofarads: 0.66 pF. Printed this way on film and larger ceramic capacitors; small chip ceramics are usually not printed at all. K is the tolerance, ±10%. The same marking also reads as 668 kΩ on a resistor, and nothing in the code says which; the body of the part does.
Other readings of the same characters, most likely first
- 668 kΩ resistor
Check it with a meter
Lift one end and measure it on a capacitance range. A good one reads close to 0.66 pF. In circuit the meter also sees everything connected across it, so the reading means little until it is out. A failed one usually reads near 0 Ω, or a steady low resistance, on the ohms range, often from a crack. On the board a shorted capacitor shorts its whole rail. A failed reading does not change what to fit: the marking still says 0.66 pF.
On a transistor or diode body, 668K is a part code instead. Those parts are listed below.
The only part printed 668K in our tables
G670H330T71Uf
- What it is
- Voltage supervisor
- Maker
- Global Mixed-mode Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Microprocessor Reset IC
- Source
- Manufacturer 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.
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