Diotec Semiconductor, Zener TVS diode, 1.5SMCJ40A-AQ, unidirectional 1-channel, 40V reverse standoff, 1500W peak pulse, clamping 64.5V at 23.3A, -50°C to 150°C junction, SMC/DO-214AB surface mount.
| Parameter | Value |
|---|---|
| Type | Zener |
| Mounting | Surface Mount |
| Voltage - breakdown | 44.4V |
| Voltage - clamping (Max) @ ipp | 64.5V |
| Voltage - reverse standoff | 40V |
| Current - peak pulse (10/1000μs) | 23.3A |
| Power - peak pulse | 1500W (1.5kW) |
| Power line protection | No |
| Operating temperature | -50°C~150°C(TJ) |
| Package | Strip |
| Applications | Automotive |
| Case | DO-214AB, SMC |
| Unidirectional channels | 1 |
The 1.5SMCJ40A-AQ: SMC/DO-214AB is the standard automotive TVS footprint — the two-lead unidirectional pinout mates directly with the TVS position on a 12 V power rail protection zone. The strip packaging variant is the reel-taped option; confirm the orientation stripe matches the cathode marking on the board before reflow.
The 64.5 V clamping maximum at 23.3 A peak pulse is well below the breakdown voltage of most downstream automotive ICs on a 12 V supply. The TVS absorbs the transient energy and clamps the voltage at a level the protected IC can survive, returning to its high-impedance state once the event passes.