# MMBD1203

**onsemi** · Diodes - General Purpose · SOT-23

MMBD1203 from onsemi, 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 | A1 | passive | Anode of the first diode in the series pair, per the MMBD1203 connection diagram; diodes are rated 100 V VRRM and 200 mA average forward current. |
| 2 | K2 | passive | Cathode of the second diode in the series pair, per the MMBD1203 connection diagram; diodes are rated 100 V VRRM and 200 mA average forward current. |
| 3 | K1/A2 | passive | Common center node joining the cathode of the first diode and the anode of the second diode in the series configuration. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| 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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VR | 100 |  |  | V | IR = 100 μA | 3 |
| Forward Voltage | VF | 550 |  | 600 | mV | IF = 1.0 mA | 3 |
| Forward Voltage | VF | 660 |  | 740 | mV | IF = 10 mA | 3 |
| Forward Voltage | VF | 820 |  | 920 | mV | IF = 100 mA | 3 |
| Forward Voltage | VF | 0.87 |  | 1 | V | IF = 200 mA | 3 |
| Forward Voltage | VF |  |  | 1.1 | V | IF = 300 mA | 3 |
| Reverse Current | IR |  |  | 25 | nA | VR = 20 V | 3 |
| Reverse Current | IR |  |  | 50 | nA | VR = 50 V | 3 |
| Reverse Current | IR |  |  | 100 | μA | VR = 50 V, TA = 150°C | 3 |
| Total Capacitance | CT |  |  | 2 | pF | VR = 0, f = 1.0 MHz | 3 |
| Reverse Recovery Time | trr |  |  | 4 | nS | IF = IR = 10 mA, IRR = 1.0 mA, RL = 100 Ω | 3 |
| Maximum Repetitive Reverse Voltage | VRRM |  |  | 100 | V |  | 2 |
| Average Rectified Forward Current | IF(AV) |  |  | 200 | mA |  | 2 |
| Non-Repetitive Peak Forward Surge Current | IFSM |  |  | 1 | A | Pulse Width = 1.0 second | 2 |
| Non-Repetitive Peak Forward Surge Current | IFSM |  |  | 2 | A | Pulse Width = 1.0 microsecond | 2 |
| Storage Temperature Range | TSTG | -55 |  | 150 | °C |  | 2 |
| Operating Junction Temperature | TJ |  |  | 150 | °C |  | 2 |
| Power Dissipation | PD |  |  | 350 | mW |  | 3 |
| Derate Above 25°C |  |  |  | 2.8 | mW/°C |  | 3 |
| Thermal Resistance, Junction-to-Ambient | RθJA |  |  | 357 | °C/W |  | 3 |

## CAD (KiCad official)

- Symbol: `MMBD1203`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbd1203-etched.step` / `mmbd1203-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbd1203.step` / `mmbd1203.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586199877763649536) (8 pp, sha256 `c5c40f64077298e7`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/mmbd1203-datasheet.pdf)