Flight-grade 50 V smart high-side switch brings protection and current telemetry to primary 28 V power distribution
PLANO, Texas, November 12, 2026 – Apogee Semiconductor today announced flight-grade versions of its ARPS1050A5 radiation-hardened smart high-side power switch for 28 V spacecraft buses. Following the August flight-grade release of the ARPS1020A5 for standard 3.3 V, 5 V, and 12 V rails, the announcement extends the family’s flight-grade offering to primary 28 V power distribution.
The ARPS1050A5 is rated for 50 V, 4 A operation with 57 mΩ RDS(on) and uses the same 3 mm × 5 mm, 24-pin QFN footprint as the ARPS1020A5. Both devices share a common protection and telemetry architecture. For 28 V loads requiring more than a single device’s 4 A capacity, true current sharing enables parallel operation to support higher-current applications.
“With the ARPS1050A5 now available in flight grade, designers can use one footprint and one protection and telemetry architecture from point-of-load rails through primary power distribution,” said Mark Hamlyn, General Manager, Apogee Semiconductor.
Expanding the ARPS Flight-Grade Family
Apogee introduced the ARPS family in February 2026, establishing a common approach to protection and current monitoring across regulated spacecraft rails and the 28 V bus. The August ARPS1020A5 announcement brought that approach to flight grade for 3.3 V, 5 V, and 12 V rails. The ARPS1050A5 now extends that flight-grade path to loads on the primary bus.
As an alternative to fuses and discrete breakers, the ARPS1050A5 combines load-level protection with fault reporting and current telemetry. Short-circuit, overtemperature protection, and programmable overcurrent help contain channel faults, while status and current-sense outputs provide information the spacecraft controller can use to manage recovery, shed loads, or reconfigure power paths.
When paired with Apogee’s AxIO16 radiation-hardened I/O expanders, ARPS devices support enable control and fault/status collection across power distribution channels.
“The flight-grade ARPS1050A5 brings our fault-management roadmap to the 28 V primary bus. Paired with AxIO16, it gives designers radiation-hardened building blocks to detect, contain, and report faults across power and interface boundaries, enabling resilient architectures that take advantage of COTS components,” said Mark Hamlyn.
Key Capabilities
- 50 V, 4 A operation with 57 mΩ RDS(on); supports the 28 V unregulated spacecraft power bus
- Same 3 mm × 5 mm, 24-pin QFN footprint and protection and telemetry architecture as the ARPS1020A5
- True current sharing in paralleled implementations for higher-current 28 V loads
- Short-circuit, overtemperature protection and programmable overcurrent
- Adjustable soft-start to limit inrush current
- Guaranteed break-before-make operation
- Fault-reporting and current-sense outputs for external telemetry, fault management, and health monitoring
Radiation Performance
- TID: 100 krad(Si)
- SEE characterized to LET 75.1 MeV-cm²/mg at 36 V VIN
Ordering & Availability
Contact Apogee for flight grade orders and current lead-time confirmation: orders@apogeesemi.com | +1 9725594660.
About Apogee Semiconductor
Apogee Semiconductor is a leading provider of radiation-hardened semiconductor solutions for space, aerospace, and defense applications. The company develops high-performance microelectronics designed to withstand extreme environments, enabling mission-critical systems in the most challenging conditions.
