Infineon BTS80009-SWPF-1ES SPOC™ Wire Guard Power Switch IC

Introduction

The Infineon BTS80009-SWPF-1ES is an automotive high-side power switch IC designed to control and protect high-current 12 V loads. Part of the SPOC™ Wire Guard family, it combines power switching, diagnostic reporting, and integrated protection functions in a compact device intended to help replace conventional fuses and relays.

Part Description

The BTS80009-SWPF-1ES is a high-side automotive power distribution switch capable of driving loads up to 34.5 A. It uses a 24-bit SPI interface with CRC support, allowing a microcontroller or ECU to command the output and monitor operating conditions through diagnostic feedback.

Its embedded protection features include overcurrent protection, I²t-based wire protection, inrush-current handling, capacitive-load switching support, and load-shedding capability. These functions help protect wiring harnesses, connected loads, and the power-switching device during abnormal or demanding electrical conditions.

Designed for 12 V vehicle electrical systems, the device is suitable for intelligent power distribution architectures where electronic switching can improve control, diagnostics, reliability, and serviceability compared with mechanical relays and conventional fuses.

Applications

Potential applications for the BTS80009-SWPF-1ES include:

• High-current 12 V load switching
• ECU main power switching
• Electronic fuse replacement
• Relay replacement in vehicle power distribution systems
• Intelligent battery power distribution modules
• Protected supply switching for automotive subsystems
• Load-shedding circuits
• Capacitive load control
• Inrush-current-managed power rails
• Fail-operational power supplies

Industries

Possible industries for this power switch IC include:

• Automotive manufacturing
• Electric and hybrid vehicle systems
• Commercial and heavy-duty vehicles
• Agricultural and construction equipment
• Industrial vehicles
• Fleet and transportation equipment
• Automotive electronics and ECU design
• Vehicle power-distribution module development

Usage Ideas

1. Smart Fuse Box
   Build a microcontroller-controlled fuse box that uses SPI diagnostics to detect overloads, disconnect faulty branches, and report fault status to a vehicle network.

2. ECU Power Manager
   Use the IC as the main high-side switch for an ECU supply, enabling controlled startup, fault isolation, load shedding, and monitored shutdown.

3. Auxiliary Load Controller
   Create a protected controller for high-current accessories such as pumps, heaters, fans, or lighting modules, with controlled inrush current and electronic overcurrent protection.

Conclusion

The Infineon BTS80009-SWPF-1ES is a robust high-side power switch IC for automotive 12 V power-distribution applications. Its high current capability, SPI-controlled diagnostics, CRC communication support, and integrated protection mechanisms make it well suited to modern electronic fuse, relay replacement, ECU switching, and fail-operational power supply designs.