SMD code 588B
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.
588B is a capacitor marking
0.58 pF
0.58 pF capacitor
58 followed by the multiplier 8, in picofarads: 0.58 pF. Printed this way on film and larger ceramic capacitors; small chip ceramics are usually not printed at all. B is the tolerance, ±0.1 pF.
Check it with a meter
Lift one end and measure it on a capacitance range. A good one reads close to 0.58 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 0.58 pF.
On a transistor or diode body (DFN), 588B is a part code instead. Those parts are listed below.
2 parts are printed 588B
Not sure which one you have?
Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.
Complementary MOSFET pair (N-channel and P-channel), all DFN. What differs:
CMS3588A6-HFDFNComchipComchip
- What it is
- Complementary MOSFET pair (N-channel and P-channel)
- Maker
- Comchip
- Package
- DFN
- Pins
- Not recorded
- Details
- 14 V, 6 A N+P-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET pair.
MTC3588CDFA6DFNCYStekCYStek
- What it is
- Complementary MOSFET pair (N-channel and P-channel)
- Maker
- CYStek
- Package
- DFN
- Pins
- Not recorded
- Details
- 14 V, 11/-7.6 A N+P-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET pair.
Is it dead? One meter test per kind
Parts of the same kind are tested the same way, so each test is here once. Each part above points to its own.
MOSFET pair
Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.
Working, it reads
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and is not a fault. Lift a leg to be sure.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
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 588B
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
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Open this in the search to correct a character or try another package.