# SMCJ70AX

**Shenzhen JingYang** · ESD And Surge Protection (TVS/ESD) · SMC

SMCJ70AX from Shenzhen JingYang, in a SMC. 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 an unpolarised bidirectional ESD/TVS diode; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised bidirectional ESD/TVS diode; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen JingYang |
| Package | SMC |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak Pulse Power Dissipation (10/1000 us waveform) | PPPM | 1500 |  |  | W | 10/1000 us waveform (Note 1, 2, FIG.1); printed as 'Min 1500' | 1 |
| Operating Junction Temperature Range | TJ | -55 |  | 150 | °C |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | °C |  | 1 |
| Peak Forward Surge Current | IFSM |  |  | 200 | Amps | 8.3ms single half sine-wave superimposed on rated load, JEDEC method (Note 2, 3) | 1 |
| Breakdown Voltage MIN (unidirectional SMCJ70A) | VBR MIN | 77.8 |  |  | V | @ IT 1.0 mA | 3 |
| Breakdown Voltage MAX (unidirectional SMCJ70A) | VBR MAX |  |  | 89.5 | V | @ IT 1.0 mA | 3 |
| Maximum Clamping Voltage (unidirectional SMCJ70A) | VC |  |  | 113 | V | @ IPP 13.3 A | 3 |
| Reverse Leakage (unidirectional SMCJ70A) | IR |  |  | 5 | uA | @ VRMW 70 V | 3 |
| Reverse Stand-Off Voltage (unidirectional SMCJ70A) | VRWM |  |  | 70 | V |  | 3 |
| Time from 25°C to peak temperature | t |  |  | 8 | minutes | Lead-free assembly reflow profile | 7 |
| Peak Temperature | TP |  |  | 260 | °C | Lead-free assembly reflow; do not exceed 260°C | 7 |
| Time within 5°C of actual peak temperature | tp | 20 |  | 40 | secs | Lead-free assembly reflow profile | 7 |
| Ramp-down Rate |  |  |  | 6 | °C/second | Lead-free assembly reflow profile, from peak | 7 |
| Average ramp-up rate (liquidus temp to peak) |  |  |  | 3 | °C/second | Lead-free assembly reflow profile | 7 |
| TS(max) to TL ramp-up rate |  |  |  | 3 | °C/second | Lead-free assembly reflow profile | 7 |
| Time above liquidus (tL) | tL | 60 |  | 150 | secs | Liquidus temperature TL 217°C, lead-free assembly | 7 |
| Preheat Temperature Min | Ts(min) | 150 |  |  | °C | Lead-free assembly reflow profile | 7 |
| Preheat Temperature Max | Ts(max) |  |  | 200 | °C | Lead-free assembly reflow profile | 7 |
| Preheat Time (min to max) | ts | 60 |  | 180 | secs | Lead-free assembly reflow profile | 7 |

## CAD (KiCad official)

- Symbol: `SMCJ70AX`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: SMC (KiCad packages3D, STEP)
- 3D model files: `smcj70ax-etched.step` / `smcj70ax-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smcj70ax.step` / `smcj70ax.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen JingYang datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603031007989669888) (7 pp, sha256 `5c412a4808aba271`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal convention` (convention), consensus `off` (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/smcj70ax-datasheet.pdf)