# B72210S0271K101

**TDK** · Varistors · THT, P=7.5mm

B72210S0271K101 from TDK, in a THT, P=7.5mm. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 1 | passive | Non-polar tinned wire lead (d 0.8 mm ±0.05, l min 25.0 mm) at 7.5 mm lead spacing; rated 275 VRMS / 350 VDC, varistor voltage 430 V ±10% at 1 mA. |
| 2 | 2 | passive | Non-polar tinned wire lead (d 0.8 mm ±0.05, l min 25.0 mm) at 7.5 mm lead spacing; rated 275 VRMS / 350 VDC, max. surge current 2500 A (8/20 µs, 1 time). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TDK |
| Package | THT, P=7.5mm |
| Category | Circuit Protection |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Varistor voltage tolerance | ΔVV | -10 |  | 10 | % |  | 10 |
| Varistor voltage | VV |  | 430 |  | V | 1 mA | 10 |
| Maximum clamping voltage | vc,max |  |  | 710 | V | ic = 25.0 A | 10 |
| Typical capacitance | Ctyp |  | 220 |  | pF | 1 kHz | 10 |
| Maximum surge current, 1 time | imax |  |  | 2500 | A | 8/20 µs, 1 time, TA = 105 °C | 9 |
| Nominal discharge current | In |  |  | 1500 | A | 8/20 µs, 15 times, TA = 105 °C | 9 |
| Maximum energy absorption | Wmax |  |  | 43 | J | 2 ms, TA = 105 °C | 9 |
| Maximum average power dissipation | Pmax |  |  | 0.4 | W | TA = 105 °C | 9 |
| Maximum AC operating voltage | VRMS |  |  | 275 | V | TA = 105 °C | 9 |
| Maximum DC operating voltage | VDC |  |  | 350 | V | TA = 105 °C | 9 |
| Operating temperature |  | -40 |  | 105 | °C | IEC 61051 | 2 |
| Storage temperature |  | -40 |  | 125 | °C |  | 2 |
| Electric strength |  | 2.5 |  |  | kVRMS | IEC 61051 | 2 |
| Insulation resistance | Rins | 100 |  |  | MΩ | IEC 61051 | 2 |

## CAD (KiCad official)

- Symbol: `B72210S0271K101`
- Footprint: `Adom_Gen:TDK_B72210`
- 3D model: THT, P=7.5mm (KiCad packages3D, STEP)

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TDK datasheet](https://www.tdk-electronics.tdk.com/inf/70/db/var/SIOV_Leaded_StandarD.pdf?ref_disty=digikey) (47 pp, sha256 `0f741b20f56ee3e3`, retrieved 2026-11-05, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/b72210s0271k101-datasheet.pdf)