STMicroelectronics RHFLVDS32AK1

Overview

RHFLVDS32AK1 from STMicroelectronics is a rad-hard quad LVDS receiver designed for aerospace data links, featuring CMOS outputs, ANSI TIA/EIA-644 compliance, 400 Mbps (200 MHz) operation, -55 °C to +125 °C temperature range, and guaranteed radiation tolerance up to 300 krad TID. It implements fail-safe logic and cold-spare buffers on all pins for high-reliability bus redundancy in satellite command & telemetry systems.

For engineers reviewing the RHFLVDS32AK1 datasheet, RHFLVDS32AK1 pinout, RHFLVDS32AK1 application, or RHFLVDS32AK1 equivalent, key selection criteria include radiation hardness (SEL immune to 135 MeV·cm²/mg), propagation delay skew (≤0.25 ns channel-to-channel), hermetic Ceramic Flat-16 packaging, and fail-safe output behavior during floating or shorted inputs.

Technical Context

The RHFLVDS32AK1 integrates four independent LVDS receivers with TTL-compatible CMOS outputs, each driven by differential input pairs (1A/1B through 4A/4B) and controlled by dual enable inputs (G and G). Its internal fail-safe circuitry forces outputs high when inputs are open or shorted, ensuring deterministic state in fault conditions.

Cold-spare functionality is implemented via high-impedance I/O buffers when VCC = GND, enabling hot-swappable redundancy without bus contention. Radiation hardening leverages ST's proprietary CMOS process with layout-level mitigation, achieving full QML-V qualification per MIL-PRF-38535 and MIL-STD-883 TM 1019.

Key Specifications

Pinout & Package

Housed in a hermetic Ceramic Flat-16 package (SMD 5962F98652), with electrically grounded metallic lid and 0.050" lead pitch. Package dimensions: 10.13 mm × 7.06 mm × 2.72 mm (L × W × H), mass = 0.65 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SNJ54LVDS32FK and RHFLVDS32AK01V, the RHFLVDS32AK1 provides verified radiation performance for early-stage development while sharing identical electrical behavior and pinout - enabling seamless transition to flight model without redesign.

Availability

RHFLVDS32AK1 is available at Aetrix Electronics and suitable for spacecraft telemetry receivers, satellite command interfaces, onboard data bus isolation, and radiation-tolerant test equipment requiring stable component supply across extended development cycles.

Supply support for RHFLVDS32AK1 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, with design and manufacturing facilities across Europe, Asia, and the Americas.

The RHFLVDS32A belongs to ST's rad-hard analog interface product line, engineered specifically for high-reliability aerospace data acquisition and communication systems operating in extreme radiation environments.

FAQ

What is the difference between RHFLVDS32AK1 and RHFLVDS32AK01V?

RHFLVDS32AK1 is the engineering model intended for design validation and prototype testing, shipped in tray packaging with basic documentation. RHFLVDS32AK01V is the flight-qualified QML-V variant with full MIL-PRF-38535 screening, SMD 5962F98652 marking, and complete certification reports including PIND, SEM, and Group C/D inspection data.

Does RHFLVDS32AK1 require external termination resistors?

No - the RHFLVDS32AK1 integrates internal 100 Ω differential termination between each A/B input pair, eliminating the need for external resistors. This simplifies PCB layout and ensures consistent impedance matching across all four channels without added component count or placement sensitivity.

How does the fail-safe function behave during power-up sequencing?

During power-up, the fail-safe circuit asserts logic-high outputs until valid differential input signals exceed ±100 mV threshold. This behavior is maintained regardless of enable pin state, ensuring defined outputs even before G/G signals stabilize - critical for preventing metastability in FPGA configuration interfaces.

Can RHFLVDS32AK1 operate with 2.5 V LVDS sources?

Yes - its input common-mode range (-4 V to +5 V) fully accommodates 2.5 V LVDS sources. The device interprets differential amplitude (VID ≥100 mV) independently of common-mode level, and internal biasing ensures correct decision thresholds across the entire specified range without external level-shifting components.