# 1N4466

**Microchip Tech** · Zener Diodes · DO-41

1N4466 from Microchip Tech, in a DO-41. 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 | K | passive | Cathode, indicated by the band on the body; the Zener (1N4466, VZ 11.0 V at IZT 23.0 mA) regulates in reverse breakdown with this terminal positive. |
| 2 | A | passive | Anode, the axial lead opposite the banded end; forward voltage is max 1.0 V at 200 mA and 1.5 V at 1.0 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | DO-41 |
| Category | Diodes |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage tolerance | VZ | -5 |  | 5 | % | Standard tolerance, no suffix | 1 |
| Maximum dynamic impedance | ZZT |  |  | 6 | Ohms | @ IZT | 3 |
| Maximum knee impedance | ZZK |  |  | 550 | Ohms | @ IZK = 0.25 mA | 3 |
| Maximum reverse current | IR |  |  | 0.3 | µA | @ VR = 8.80 V | 3 |
| Maximum continuous current | IZM |  |  | 130 | mA | Note 1: see Maximum Ratings for PD temperature conditions | 3 |
| Surge current | IZSM |  |  | 1.3 | Amps | @ 8.3 ms square wave | 3 |
| Forward voltage | VF |  |  | 1 | V | @ 200 mA | 1 |
| Forward voltage | VF |  |  | 1.5 | V | @ 1.0 A | 1 |
| Junction and storage temperature | TJ & TSTG | -65 |  | 175 | °C | TA = 25 °C unless otherwise specified | 1 |
| Steady state power dissipation | PD |  |  | 1.5 | W | TL = +112 °C, L = .375 inch (9.53 mm) | 1 |
| Solder temperature | TSP |  |  | 260 | °C | @ 10 s | 1 |
| Thermal resistance junction-to-lead | RӨJL |  |  | 42 | °C/W | @ .375 inch (9.52 mm) from body | 1 |
| Nominal zener voltage | VZ |  | 11 |  | Volts | @ IZT = 23.0 mA | 3 |
| Test current | IZT |  | 23 |  | mA |  | 3 |

## 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 | copper | tin | • TERMINALS: Tin/lead (Sn/Pb) or RoHS compliant matte/tin (commercial grade only) over copper. | 2 |

## CAD (KiCad official)

- Symbol: `1N4466`
- Footprint: `Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal`
- 3D model: DO-41 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/1n4466-datasheet.pdf) (6 pp, sha256 `a3731fedc73f168e`, retrieved 2026-10-31, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-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/1n4466-datasheet.pdf)