The BTS3800SLHTSA1 is a single-channel low-side N-channel power switch from Infineon's HITFET series, designed for general-purpose on/off control of resistive and inductive loads up to 350 mA.
At 800 mOhm typical Rds(on), the BTS3800SLHTSA1 is a higher-resistance switch compared to the HITFET sibling BTS142DATMA1, which lists 23 mOhm typical. The trade-off is clear: the BTS3800SLHTSA1 handles 350 mA versus 4.6 A for the BTS142DATMA1, so the 800 mOhm part is suited to low-current auxiliary loads — solenoid drivers, indicator lamps, or relay coils — where the higher Rds(on) does not cause excessive dissipation. The input is non-inverting and the switch activates with a logic-level On/Off signal; no external Vcc supply is needed. This simplifies the drive interface — a GPIO pin from an MCU can control the switch directly.
Protection features and package details
Integrated fault protection covers over-temperature and over-voltage events, reducing the need for external clamp diodes or thermal shutdown circuits. The 1:1 input-to-output ratio means the switch state follows the control signal without latching or auto-restart behaviour. The small footprint suits space-constrained boards where a relay or discrete MOSFET would take up more area.
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