Microchip Technology SAMRH71F20E-7GB-E

Overview

SAMRH71F20E-7GB-E from Microchip Technology is a radiation-hardened 32-bit Arm Cortex-M7 microcontroller designed for on-board computing in critical aerospace missions. It operates at 100 MHz, integrates 128 KB Flash with ECC, 384 KB TCM RAM, 768 KB multiport SRAM, dual CAN-FD, SpaceWire, MIL-STD-1553B, and 10/100 Ethernet MAC with IEEE 1588 PTP support.

For engineers reviewing the SAMRH71F20E-7GB-E datasheet, SAMRH71F20E-7GB-E pinout, SAMRH71F20E-7GB-E application, or SAMRH71F20E-7GB-E equivalent, key selection criteria include rad-hard TID/SEL performance (100 krad(Si), LET ≤78 MeV·cm²/mg), dual PLL clocking, hardened external memory controller (HEMC), and deterministic real-time peripherals including four 32-bit Timer Counters and two 16-bit PWMs with dead-time control.

Technical Context

The SAMRH71F20E-7GB-E implements the ATMX150RHA process with on-chip transient and permanent error detection/correction. Its architecture features a concurrent AMBA system bus with advanced XDMAC DMA, FlexProtect Matrix for privilege-based peripheral access, and hardened memories protected by Hamming ECC (up to 2-bit correction per 32 bits).

It integrates dual PLLs-one for system clock and one for peripherals-alongside independent watchdogs (WDT and RSWDT), programmable supply monitors, and failure-detection circuitry for main oscillator (3–20 MHz), 32.768 kHz RTC oscillator, and core voltage. The device supports deterministic real-time operation via four 3-channel Timer Counters with quadrature decoding and two 4-channel PWMs with fault inputs and complementary outputs.

Key Specifications

Pinout & Package

The SAMRH71F20E-7GB-E is packaged in a 625-ball TFBGA (1.0 mm pitch, 27 mm × 27 mm footprint) rated for aerospace-grade thermal and mechanical reliability. Pin assignment follows Microchip's DS60001593H-page 21 signal mapping for TFBGA625, with dedicated banks for VDDIO/VSSIO, VDDCORE/VSSCORE, JTAG-DAP, SpaceWire, 1553, Ethernet, QSPI, and high-speed I/O groups.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar rad-hard microcontroller applications.

Compared with RTAX2000S-1DQG and LEON3FT-RTAX2000S, the SAMRH71F20E-7GB-E delivers higher integration density, deterministic real-time response via native Cortex-M7 execution, and production-ready radiation-hardened peripherals-reducing design risk and qualification effort for C&DH and sensor management roles.

Availability

SAMRH71F20E-7GB-E is available at Aetrix Electronics and suitable for on-board command & data handling, spacecraft sensor management, and avionics data networking requiring stable component supply across extended mission lifecycles and extreme environmental conditions.

Supply support for SAMRH71F20E-7GB-E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and radiation-hardened ICs for aerospace, defense, and industrial markets.

The SAMRH71 product line was developed specifically for high-reliability on-board computing in radiation-intensive environments, emphasizing deterministic real-time operation, memory/data integrity, and seamless integration of legacy and modern spacecraft buses.

FAQ

What radiation hardness specifications apply to the SAMRH71F20E-7GB-E?

The SAMRH71F20E-7GB-E is qualified to Revision E radiation performance: no single-event latch-up (SEL) below a linear energy transfer (LET) of 78 MeV·cm²/mg at 125°C, and total ionizing dose (TID) immunity up to 100 krad(Si) per ESCC-22900 test method. These values are measured and documented in Microchip's DS60001593H datasheet for the SAMRH71F20E-7GB-E device.

Does the SAMRH71F20E-7GB-E support IEEE 1588 Precision Time Protocol?

Yes, the SAMRH71F20E-7GB-E integrates a 10/100 Ethernet MAC with hardware-accelerated IEEE 1588 Precision Time Protocol (PTP) timestamping. Timestamp registers are accessible directly by firmware, enabling sub-microsecond synchronization accuracy for distributed spacecraft systems without external timing ICs.

What package type and pin count does the SAMRH71F20E-7GB-E use?

The SAMRH71F20E-7GB-E uses a 625-ball TFBGA package with 1.0 mm ball pitch and a 27 mm × 27 mm body size. This package is rated for operation from –55°C to +105°C and is optimized for high-density, low-inductance interconnect in space-qualified PCB assemblies.

How many CAN-FD interfaces does the SAMRH71F20E-7GB-E include?

The SAMRH71F20E-7GB-E integrates two fully compliant CAN-FD controllers supporting ISO 11898-1:2015 and Bosch CAN FD Specification. Each controller supports bit rates up to 5 Mbps in FD mode and includes dedicated message RAM, filtering, and loopback self-test capability.

Is the SAMRH71F20E-7GB-E pin-compatible with other SAMRH71 variants?

No - the SAMRH71F20E-7GB-E is not pin-compatible with CQFP256 variants such as SAMRH71F20E-7CB-E. The TFBGA625 and CQFP256 packages have fundamentally different pinouts, I/O bank assignments, and power delivery structures. Migration requires full PCB redesign and layout validation.