Automotive high-side switch — when the load needs protection built in
It integrates an N-channel MOSFET with a 150 mOhm typical Rds(on) and a full suite of fault protections — fixed current limiting, over-temperature shutdown, and over-voltage clamping — so the load circuit doesn't need discrete protection components. Rated for a load voltage range of 6 V to 52 V, it covers 12 V and 24 V automotive electrical systems with margin, and reaches into 48 V mild-hybrid bus architectures. The single output delivers up to 1.8 A continuous, limited by the package thermal path through the PG-TO252-5 exposed pad. The switch uses a simple On/Off interface with non-inverting input logic — no Vcc supply rail needed, just the load voltage on the drain.
At 1.8 A output, the 150 mOhm typical on-resistance produces about 0.5 W conduction loss (I²R). In the PG-TO252-5 package with the exposed tab soldered to a copper plane, that keeps the junction rise within the 150°C ceiling at 85°C ambient. If the load draws closer to the 1.8 A maximum continuously, the PCB copper area under the tab sets the real thermal limit — a 1-inch² pour is the practical minimum for sustained operation. The 6 V to 52 V load voltage range means the same part works across 12 V headlamp relays, 24 V truck solenoids, and 48 V starter-generator pre-charge circuits. The over-voltage clamp protects the load during load-dump transients up to the 52 V maximum.
Obsolete — sourcing through the independent channel
The BTS452TT carries an Obsolete lifecycle status from Infineon. Production has ended; the only supply channel is the independent distribution market — surplus, new-old-stock, and broker inventory.
Package and footprint — PG-TO252-5
The BTS452TT is supplied in a PG-TO252-5 package (DPak with 4 leads plus tab, also known as TO-252AD). The tab is the drain terminal. Store the reels in a dry environment — the package is moisture-sensitive, and the reel seal should remain intact until the board assembly reflow step.