Littelfuse Inc. 1.5SMC Series Zener TVS Diode, 1.5SMC33A, 1500W Peak Pulse Power, 28.2V Reverse Standoff, 45.7V Clamping, Unidirectional, DO-214AB (SMC) Surface Mount.
| Parameter | Value |
|---|---|
| Type | Zener |
| Series | 1.5SMC |
| Mounting | Surface Mount |
| Voltage - breakdown | 31.4V |
| Voltage - clamping (Max) @ ipp | 45.7V |
| Voltage - reverse standoff | 28.2V |
| Current - peak pulse (10/1000μs) | 33.3A |
| Power - peak pulse | 1500W (1.5kW) |
| Power line protection | No |
| Operating temperature | -55°C~150°C(TJ) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Applications | General Purpose |
| Case | DO-214AB, SMC |
| Unidirectional channels | 1 |
The 1.5SMC33A: This makes it suitable for clamping surges on 24V DC rails common in industrial control panels and telecom equipment.
The SMC footprint is larger than the smaller SMA/SMB siblings, offering better thermal dissipation for the 1500W pulse rating — the copper pad area under the cathode tab directly sets the junction-to-ambient thermal resistance during a surge.
If a different clamping voltage is needed later, the BOM can be adjusted without a PCB layout change.