It clamps at 85.5V maximum, providing a defined voltage-limiting path for surge events on 48V rails — common in telecom, industrial control, and power distribution. The 53.3V minimum breakdown voltage ensures the device does not conduct at nominal 48V, yet triggers well before the downstream circuitry sees damaging overvoltage. This margin is the key selection parameter for a 48V bus.
Package, mounting, and production status
The package footprint is standard across the SMBJ series, simplifying board layout. For BOM planning, the base product number SMBJ48 can be used to search for alternate reel quantities or packaging options.
Temperature range and application environment
Rated for operation from -65°C to 150°C junction temperature, the SMBJ48E3/TR13 suits outdoor, industrial, and under-hood environments where thermal cycling is a concern. The wide temperature window also supports derating for sustained high-power pulses at elevated ambient.