SMD code S03A
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.
2 parts are printed S03A
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.
LM2664M6SOT-23-66 pins, National SemiconductorSOT-23-66 pinsNational Semiconductor
- What it is
- Not recorded
- Maker
- National Semiconductor
- Package
- SOT-23-6
- Pins
- 6
- Details
- Linear IC: Switched Capacitor Voltage Converter 1.8..5.5V, 40mA
- Source
- Published code list
Is it dead? The meter test is below: Ceramic capacitor.
P0300SASMB2 pins, Yangjie Electronic TechSMB2 pinsYangjie Electronic Tech
- What it is
- Not recorded
- Maker
- Yangjie Electronic Tech
- Package
- SMB
- Pins
- 2
- Details
- Thyristor surge protector (TSS)
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
Ceramic capacitor
Ohms range across it, and a capacitance range with it lifted.
Working, it reads
On the ohms range it reads open, or climbs to open as it charges. Lifted, a capacitance range reads close to its value.
Dead, it reads
- Near 0 Ω, or a few ohms: shorted. The usual failure, often from a crack caused by board flex or heat, and it can come and go.
- A steady resistance, kilohms rather than open: cracked and leaking.
- Lifted, far below its value on a capacitance range: cracked open or drifted. Less common than a short, but it happens.
- On the board
- a shorted capacitor shorts its whole rail, so every capacitor on that rail reads the same short. Lift one end, or feed the rail from a current-limited supply and feel which part warms up.
- Compare:
- Chip capacitors are mostly unmarked, so the value comes from the schematic or the same position on a working board.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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.
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