SMD code 621
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.
621 on a chip resistor
620 Ω
620 Ω resistor, 5%
62 followed by 1 zero. Three digits is normally the 5% series. The same marking also reads as 620 pF on a capacitor or 620 µH on an inductor, and nothing in the code says which; the body of the part does.
Other readings of the same characters, most likely first
- 620 pF capacitor
- 620 µH inductor
Check it with a meter
Lift one end and measure across it. A good one reads 620 Ω within 5%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 620 Ω on the board is a fault. Open, or well above 620 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 620 Ω. 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 (SOT-23-5, SOT-23, SOT-89), 621 is a part code instead. Those parts are listed below.
18 parts are printed 621
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.
DC-DC converter, all Torex. What differs:
XC9111B211PRSOT-893 pinsSOT-893 pins
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-89
- Pins
- 3
- Details
- DC/DC voltage converter IC: PFM st-up, 100kHz, 2.1V±2.5%, 400mA
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC9111D211MRSOT-23-55 pinsSOT-23-55 pins
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PFM st-up, 100kHz, 2.1V±2.5%, 400mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC9206A213MSOT-23-55 pinsSOT-23-55 pins
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM st-dwn, 300kHz, 2.1V±2%, 600mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
Integrated circuit
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
- A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
- Supply present, output stuck: failed, or its load has.
- On the board:
- A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
- Compare:
- The surest reference is the same IC on a working board, measured pin by pin.
- Watch for:
- Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Did you find your part?
Open this in the search to correct a character or try another package.