STMicroelectronics RHFLVDSR2D2K1

Overview

RHFLVDSR2D2K1 from STMicroelectronics is a rad-hard dual LVDS driver-receiver IC designed for aerospace data links, featuring two independent TTL-to-LVDS drivers and two LVDS-to-TTL receivers, 3.3 V operation, 400 Mbps data rate, -55 °C to +125 °C temperature range, and hermetic Ceramic Flat-18 packaging. It supports fail-safe outputs, cold-spare I/O buffers, and radiation tolerance up to 300 krad TID.

For engineers reviewing the RHFLVDSR2D2K1 datasheet, RHFLVDSR2D2K1 pinout, RHFLVDSR2D2K1 application, or RHFLVDSR2D2K1 equivalent, key selection criteria include radiation hardness (300 krad TID, SEL immunity to 135 MeV·cm²/mg), LVDS timing skew (≤0.25 ns channel-to-channel), fail-safe receiver behavior, and cold-spare capability across all pins under VCC = GND.

Technical Context

The RHFLVDSR2D2K1 integrates two fully independent LVDS transceivers on a single die: each driver accepts TTL-level inputs and delivers differential LVDS outputs compliant with ANSI TIA/EIA-644; each receiver accepts LVDS inputs over -4 V to +5 V common-mode range and produces TTL-compatible outputs. All I/Os feature cold-spare buffers enabling high-impedance state when VCC = GND.

Fail-safe logic ensures stable high-level TTL outputs during floating or shorted LVDS inputs; propagation delays are tightly controlled (tPHLD/tPLHD ≤ 2.5 ns), with channel-to-channel skew ≤ 0.25 ns and differential skew ≤ 0.3 ns. Radiation hardening is achieved via full CMOS process qualification per MIL-STD-883 TM 1019 at dose rates of 50–300 rad/s.

Key Specifications

Pinout & Package

Package: Hermetic Ceramic Flat-18 with grounded metallic lid, qualified per MIL-PRF-38535 QML-V standards. Dimensions: 11.81 mm × 7.11 mm × 2.46 mm (L × W × A), mass 0.65 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RHFLVDSR2D2K1, SNJ54LVDS31FK offers tighter timing but zero radiation assurance, while RHFLVDSR2D2K01V provides identical electrical performance with full flight qualification-making it the only drop-in replacement for mission-critical deployments.

Availability

RHFLVDSR2D2K1 is available at Aetrix Electronics and suitable for aerospace telemetry links, satellite payload interfaces, launch vehicle avionics buses, and deep-space probe command systems requiring stable component supply under extended lead times and rigorous traceability.

Supply support for RHFLVDSR2D2K1 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, specializing in automotive, industrial, and aerospace-grade ICs with vertical manufacturing and radiation-hardened process expertise.

RHFLVDSR2D2K1 belongs to ST's RHFL (Rad-Hard Fast Logic) product line, engineered specifically for high-reliability space data communication where radiation tolerance, thermal resilience, and deterministic timing are non-negotiable.

FAQ

Is RHFLVDSR2D2K1 pin-compatible with RHFLVDSR2D2K01V?

Yes-both share identical Ceramic Flat-18 pinout, electrical specifications, and functional behavior. The K1 suffix denotes an engineering model with full electrical and thermal characterization but without full QML-V screening documentation; K01V adds MIL-PRF-38535 Group C/D testing, PIND, SEM, and traceable radiation reports required for flight use.

What is the purpose of cold-spare buffering on all pins?

Cold-spare buffering places all I/Os in high-impedance state when VCC = GND, allowing redundant RHFLVDSR2D2K1 units to remain physically connected to live data buses without injecting current, loading signals, or causing contention-critical for hot-swap-capable avionics architectures.

Does RHFLVDSR2D2K1 support fail-safe operation on both drivers and receivers?

Fail-safe logic is implemented only on the receivers: when RIN+ and RIN− are floating or shorted, ROUT1/ROUT2 default to TTL-high. Drivers do not have fail-safe outputs; their TTL inputs require defined logic levels, but cold-spare mode ensures safe high-Z state if VCC is removed.

Can RHFLVDSR2D2K1 operate with a 2.5 V supply?

No-RHFLVDSR2D2K1 is specified only for 3.0–3.6 V operation. At 2.5 V, internal biasing fails, LVDS output voltage swing collapses below 250 mV, and receiver thresholds become undefined. Operation outside this range voids radiation and timing guarantees.