# B72520T0500K062

**TDK** · Varistors · 1206

B72520T0500K062 from TDK, in a 1206. 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 | Terminal 1 of the bidirectional single-chip varistor (CT1206K50G), VRMS,max 50 V, VDC,max 65 V, Isurge,max 100 A (8/20 µs); connect in parallel with the circuit to be protected. |
| 2 | 2 | passive | Terminal 2 of the bidirectional single-chip varistor (CT1206K50G), interchangeable with terminal 1 as protection is bidirectional; Vclamp,max 135 V at 1 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TDK |
| Package | 1206 |
| 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 |
|---|---|---|---|---|---|---|---|
| Maximum RMS operating voltage | VRMS,max |  |  | 50 | V |  | 8 |
| Maximum DC operating voltage | VDC,max |  |  | 65 | V |  | 8 |
| Maximum surge current | Isurge,max |  |  | 100 | A | 8/20 µs | 8 |
| Maximum energy absorption | Wmax |  |  | 600 | mJ | 2 ms | 8 |
| Maximum power dissipation | Pdiss,max |  |  | 8 | mW |  | 8 |
| Maximum operating temperature | Top,max |  |  | 125 | °C |  | 8 |
| Operating temperature | Top | -55 |  | 125 | °C | case size ≥ 0603 | 4 |
| Storage temperature | LCT/UCT | -55 |  | 150 | °C | case size ≥ 0603 | 4 |
| Response time | tresp |  |  | 0.5 | ns |  | 4 |
| Tolerance of varistor voltage | ∆VV | -10 |  | 10 | % | TA = 25 °C | 9 |
| Maximum clamping voltage | Vclamp,max |  |  | 135 | V | Iclamp = 1 A (8/20 µs) | 9 |
| Varistor voltage | VV |  | 82 |  | V | 1 mA; TA = 25 °C | 9 |
| Typical capacitance | Ctyp |  | 120 |  | pF | @ 1 V; f = 1 kHz (C ≥ 100 pF) | 9 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | silver | Silver-platinum terminations are mainly used for the large EIA case sizes 1812 and 2220. The sil￾ver-platinum termination is approved for reflow soldering, SnPb soldering and lead-free soldering with  | 64 |

## CAD (KiCad official)

- Symbol: `B72520T0500K062`
- Footprint: `Resistor_SMD:R_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `b72520t0500k062-etched.step` / `b72520t0500k062-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `b72520t0500k062.step` / `b72520t0500k062.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TDK datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588905101234331648) (79 pp, sha256 `9a351af2269c4e94`, retrieved 2026-10-18, tier: lcsc)
- **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/b72520t0500k062-datasheet.pdf)