Apogee Semiconductor AP54RHC506 Rad-Hard 5-Channel Bus Transceivers

Apogee Semiconductor AP54RHC506 Rad-Hard 5-Channel Bus Transceivers with cold sparing are intended for applications demanding radiation tolerance and high reliability, such as space and medical imaging. The AP54RHC506 is created in a 180nm CMOS process utilizing proprietary radiation-hardening techniques, delivering high resiliency to single-event effects (SEE) and to a total ionizing dose (TID) up to 30krad (Si).

The Apogee Semiconductor AP54RHC506 Rad-Hard 5-Channel Bus Transceivers belong to the AP54RHC logic family, operating over a 1.65V to 5.5V range. The output enable control pin allows all buffers to be placed in a high impedance (high-Z) state, simplifying usage in applications with shared busses or mixed power domains. A direction control pin is used to determine whether data flow is A→B or B→A.

The AP54RHC506 supports zero-power penalty™ cold-sparing along with Class 2 ESD protection on all inputs and outputs. A proprietary output stage and full power-on reset (POR) circuit allow the AP54RHC506 to be cold-spared in any redundant configuration with no static power loss on any device pad. The redundant output stage also features a high drive capability with low static power loss.

The AP54RHC506 also features a triple-redundant design throughout its entire circuitry, which allows it to be immune to single-event transients (SET) without requiring additional redundant devices. The AP54RHC506 is offered in an SMD TSSOP-14 package with an extended operating temperature range of -55°C to +125°C.

Rad-Hard Overview

Apogee Semiconductor creates Radiation Hardened (Rad-Hard) semiconductor devices for Rad-Hard and extreme Single Event Effects (SEE, SET, SEU, SEL) fields; from Space (QML-V, QML-S) to MEO, LaGrange, LEO, Atmospheric to Downhole applications. These devices are also compatible with all aerospace, defense, military, and naval applications having a full Mil-Temp range of -55°C to +125°C.  Apogee is a turnkey mixed-signal ASIC (MS-ASIC) capable firm with secure capabilities, and all Apogee products can be produced with ITAR and CONUS flows.


  • 1.65VDC to 5.5VDC operation
  • Inputs tolerant up to 5.5VDC at any VCC
  • Provides logic-level down translation to VCC
  • Extended operating temperature range (-55°C to +125°C)
  • Proprietary cold-sparing capability with zero static power penalty
  • Built-in triple redundancy for enhanced reliability
  • Internal power-on reset (POR) circuitry ensures reliable power up and power down responses during hot plug and cold sparing operations
  • Tri-state output drivers
  • Class 2 ESD protection (4000V HBM, 500V CDM)
  • TID resilience of 30krad (Si)
  • SEL resilient up to LET of 80MeV-cm2/mg


  • Space
  • Medical imaging


Location Circuit - Apogee Semiconductor AP54RHC506 Rad-Hard 5-Channel Bus Transceivers

Cold sparing example

Block Diagram - Apogee Semiconductor AP54RHC506 Rad-Hard 5-Channel Bus Transceivers
Published: 2021-08-17 | Updated: 2022-10-20