Part Specification Review

Worked for 1 min 37 sec

Reviewed the part against the existing official TDK datasheet already set on the project, so no Datasheet URL update was needed.

Key specs confirmed for B72220S0300K101 / S20K30:

Manufacturer: TDK / EPCOS
Type: Leaded metal-oxide disk varistor
Terminals: 2 straight tinned-wire leads
Max operating voltage: 30 VAC / 38 VDC
Varistor voltage: 47 V @ 1 mA, ±10%
Max clamping voltage: 93 V @ 20 A
Surge current: 2000 A, 8/20 µs, 1 time
Rated energy: 26 J, 2 ms
Power: 0.20 W
Typical capacitance: 9350 pF @ 1 kHz
Operating temperature: -40 °C to +105 °C
Lead spacing: 10.0 mm ±1 mm
Lead diameter: 1.0 mm ±0.05 mm
Body max: 21.5 mm wide, 4.9 mm thick, 25.5 mm high

Cross-check result:

Datasheet URL: OK — official TDK PDF is present.
Pin count: OK — schematic has 2 terminals, matching the datasheet.
Symbol: electrically acceptable for a non-polarized varistor, but pin descriptions/types are generic/unspecified.
Footprint: appears broadly consistent with a 2-lead disk varistor footprint, but the pad geometry was not exposed in enough detail to fully verify hole diameter against the 1.0 mm lead diameter.
Main mismatch/cleanup item: pin descriptions should ideally identify both terminals as non-polarized varistor leads rather than leaving them unspecified.

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