# BZX84C3V9LYFHT116

**ROHM Semicon** · Zener Diodes · SOT-23

BZX84C3V9LYFHT116 from ROHM Semicon, in a SOT-23. 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 | Anode | passive | Zener diode anode, connected to the diode in the inner circuit; Zener voltage 3.70 V to 4.10 V at IZ = 5 mA. |
| 2 | N/C | unconnected | No connection; not connected internally per the inner circuit diagram. |
| 3 | Cathode | passive | Zener diode cathode, connected to the diode in the inner circuit; reverse current max 3 µA at VR = 1.0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | SOT-23 |
| Category | Diodes |
| Pins | 3 |

## 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 | VZ | 3.7 |  | 4.1 | V | IZ = 5mA | 1 |
| Reverse Current | IR |  |  | 3 | μA | VR = 1.0V | 1 |
| Dynamic Impedance | ZZ |  |  | 90 | Ω | IZ = 5mA | 1 |
| Temperature Coefficient | γZ | -3 |  | 0 | mV/℃ | IZ = 5mA | 1 |
| Power dissipation | PD |  |  | 250 | mW | On glass-epoxy substrate | 1 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -65 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `BZX84C3V9LYFHT116`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bzx84c3v9lyfht116-etched.step` / `bzx84c3v9lyfht116-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84c3v9lyfht116.step` / `bzx84c3v9lyfht116.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590342467116830720) (7 pp, sha256 `eeef780f351b704c`, retrieved 2026-10-21, 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/bzx84c3v9lyfht116-datasheet.pdf)