SMD code F1AH
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.
F1AH is a fuse marking
1 A
1 A quick-acting fuse, high breaking capacity
A miniature fuse marked to IEC 60127: 1 A is the rated current. F is quick-acting: it blows on a short overload. H is high breaking capacity: usually a sand-filled ceramic body, made to break up to 1500 A at 250 V AC.
Check it with a meter
Measure it out of circuit, on the lowest ohms range or the continuity beeper. A good fuse reads a low resistance, close to 0 Ω on all but the smallest ratings; open means it has blown. A glass fuse blackened or silvered inside blew on a short, so find the short before fitting another; a cleanly broken wire is more often an overload or age. Fit the same marking: 1 A, the same speed letter and the same breaking capacity. A larger current, or a time-lag fuse where a quick-acting one was, stops protecting what it was there for, and a glass fuse where a ceramic one was can shatter on a fault.
On a transistor or diode body (SOD-123F), F1AH is a part code instead. Those parts are listed below.
The only part printed F1AH in our tables
GSF1AH
- What it is
- Rectifier
- Maker
- Good-Ark
- Package
- SOD-123F
- Pins
- 2
- Details
- Rectifier, 50 V, 1 A
- Source
- Manufacturer datasheet
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.
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