SMD code P18C in SMB
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.
4 parts in SMB are printed P18C
Not sure which one you have?
Answer up to 4 quick questions and these 5 parts are ranked, with a meter test that settles it. It works on a dead part too.
P1800SCSMBJieJieJieJie
- What it is
- Not recorded
- Maker
- JieJie
- Package
- SMB
- Pins
- 2
- Details
- Thyristor surge protector (TSS)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
10TPSMB18CASMBLittelfuseLittelfuse
- What it is
- TVS diode
- Maker
- Littelfuse
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=17.1..18.9V, Vrwm=15.3V, 39.2A, 1000W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
BEP1800SCSMBBorn SemiconductorBorn Semiconductor
- What it is
- Not recorded
- Maker
- Born Semiconductor
- Package
- SMB
- Pins
- 2
- Details
- Thyristor surge protector: Vdrm=160V, Vs=220V, Ipp=100A(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: This part.
P1800SCLRPSMBLittelfuseLittelfuse
- What it is
- Not recorded
- Maker
- Littelfuse
- Package
- SMB
- Pins
- 2
- Details
- Thyristor surge protector: Vdrm=170V, Vs=220V, Ipp=100A(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: This part.
1 more part has no package on record. Nothing rules it out, so it stays.
P6SMASF18CAFormosa MicrosemiFormosa Microsemi
- What it is
- TVS diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
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.
This part
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
- Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
- Open between every pair of pins: failed open, or a part that reads open when working.
- 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.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
TVS or ESD protection diode
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
- From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
- A reading both ways on a one-way part: leaky.
- A one-way part open both ways: failed open.
- On the board
- , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
- Compare:
- The same part on the next line or connector pin is the healthy reading to compare with.
- Watch for:
- A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
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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