SMD code 53M
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.
53M on a chip resistor
53 MΩ
53 MΩ resistor
The M is both the decimal point and the multiplier: 53 MΩ.
Check it with a meter
Lift one end and measure across it. A good one reads 53 MΩ. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 53 MΩ on the board is a fault. Open, or well above 53 MΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 53 MΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (SMB, SMC, DFN), 53M is a part code instead. Those parts are listed below.
Not sure which one you have?
Answer up to 4 quick questions and these 18 parts are ranked, with a meter test that settles it. It works on a dead part too.
The only part printed 53M in our tables
LC0504PL6
- What it is
- ESD protection diode
- Maker
- Leiditech
- Package
- DFN
- Pins
- Not recorded
- Details
- ESD protection diode, VRWM 5 V, Cj 0.8 pF
- Source
- Manufacturer datasheet
Is it dead?
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.
Was it this one?
Printed with a code easy to misread as 53M
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with 53M
For a marking with its end worn or burnt off. Each code has a page of its own.
Did you find your part?
Open this in the search to correct a character or try another package.