What this HITFET low-side switch does
The Infineon BTS3028SDLATMA1 is a single-channel N-channel low-side power switch from the HITFET® family, designed for general-purpose On/Off switching of resistive, inductive, and lamp loads. It integrates a vertical power MOSFET with a 28 mOhm typical Rds(on) and delivers up to 5 A continuous output current, switching loads up to 60 V. The input is non-inverting with a 1:1 ratio, and no external Vcc supply is needed — the gate drive is self-biased from the load voltage. Built-in fault protection covers current limiting (fixed), over-temperature, and over-voltage, making it suitable for rugged environments like automotive body controllers, industrial actuators, and power distribution modules.
Fault protection set — over-temperature, over-voltage, current limiting
Three integrated protections make this a drop-in rugged switch: fixed current limiting prevents excessive current during short circuits or inrush; over-temperature shutdown protects the die if the junction exceeds the rated limit; over-voltage clamping absorbs inductive load flyback and supply transients.
The TO-252 package with exposed drain tab allows heat sinking to the PCB copper plane, essential for continuous operation near the 5 A limit at high ambient.
For new designs, this part is a current-generation HITFET device with no imminent obsolescence risk.