The 1.5SMBJ54A: This power rating means the diode can absorb a 17.3A surge (Ipp) and clamp it to 87.1V maximum, protecting downstream circuitry from transients like load dump or inductive kickback on a 54V nominal rail. The 54V reverse standoff voltage (VRWM) is the DC operating level where the diode is effectively an open circuit — below this threshold it does not conduct. For a 48V automotive bus or a 54V telecom supply, this part sits just above the rail voltage, so it does not clip normal operation but triggers fast when a surge exceeds the breakdown voltage (60V minimum).
Bourns 1.5SMBJ54A TVS Diode, 1500W, 54V, DO-214AA
MPN1.5SMBJ54A
Active
Bourns Inc. 1.5SMBJ54A, Automotive AEC-Q101 Zener TVS Diode, 1500W Peak Pulse Power, 54V Reverse Standoff, 87.1V Clamping, DO-214AA SMB Package, Tape & Reel.
$0.2565Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Type | Zener |
| Series | Automotive, AEC-Q101, 1.5SMBJ |
| Mounting | Surface Mount |
| Voltage - breakdown | 60V |
| Voltage - clamping (Max) @ ipp | 87.1V |
| Voltage - reverse standoff | 54V |
| Current - peak pulse (10/1000μs) | 17.3A |
| Power - peak pulse | 1500W (1.5kW) |
| Power line protection | No |
| Operating temperature | -55°C~150°C(TJ) |
| Package | Tape & Reel (TR) |
| Applications | General Purpose |
| Case | DO-214AA, SMB |
| Unidirectional channels | 1 |