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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

STMicroelectronics RHRAC164245K1

Name: RHRAC164245K1
Brand: STMicroelectronics
SKU: RHRAC164245K1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RHRAC164245K1

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 48-CFlatPack

Datasheet:: RHRAC164245K1.pdf

Description:: RAD-HARD 16-BIT TRANSCEIVER, 3.3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

RHRAC164245K1 from STMicroelectronics is a radiation-hardened, 16-bit, dual-supply bidirectional transceiver with Schmitt-triggered I/Os, 3-state outputs, and cold-spare capability. It interfaces 3.3 V (A-port) and 5 V (B-port) buses in mixed-voltage space systems, supports TID up to 100 krad(Si), exhibits no SEL up to 110 MeV·cm²/mg, and delivers max 8 ns propagation delay under 50 pF load.

For engineers reviewing the RHRAC164245K1 datasheet, RHRAC164245K1 pinout, RHRAC164245K1 application, or RHRAC164245K1 equivalent, key selection criteria include rad-hard qualification (QML-V, MIL-PRF-38535), dual-rail voltage operation (2.3–5.5 V), cold-spare I/O isolation, Schmitt hysteresis (100 mV), and hermetic ceramic Flat-48 packaging for high-reliability aerospace bus bridging.

Technical Context

This device implements two independent 8-bit bidirectional data paths (Port A: 3.3 V / Port B: 5 V), each controlled by dedicated DIRx and active-low OEx signals. Directional flow is determined by DIRx logic level (L = B→A, H = A→B), while output enable is asserted independently per port via OE1/OE2.

Cold-spare operation requires simultaneous grounding of both VDD1 and VDD2 (0 V), enabling high-impedance I/O isolation without bus contention or leakage current injection. Power sequencing mandates VDD1 powered before VDD2 during startup and VDD2 powered down before VDD1 during shutdown to prevent latch-up or undefined states.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.3 V to 5.5 V per rail (VDD1 ≥ VDD2 enforced; supports 3.3 V ↔ 5 V level shifting)
Propagation Delay (tPD)	≤ 8 ns max (CL = 50 pF, VDD1 = 4.5–5.5 V, VDD2 = 2.7–3.6 V; enables high-speed inter-bus communication)
Schmitt Hysteresis	100 mV (VT+ − VT−); improves noise immunity on noisy spacecraft data lines
Total Ionizing Dose (TID)	100 krad(Si) guaranteed (RHA QML-V qualified per MIL-STD-883 TM 1019)
Single Event Latch-up (SEL)	No latch-up up to 110 MeV·cm²/mg (tested at 125 °C, 60° angle, 1×10⁷ n/cm² fluence)
I/O Internal Series Resistor	26 Ω per pin (limits transient current, reduces EMI, protects against short-circuit stress)
Operating Temperature	−55 °C to +125 °C (fully characterized across range; suitable for deep-space thermal environments)

Pinout & Package

Hermetic ceramic Flat-48 package per MIL-PRF-38535, screened for space applications. Lid configuration: floating (K1 variant). Mass: 1.5 g.

Pin/Terminal	Circuit Role	Design Meaning
1, 24	DIR1, DIR2	Direction control inputs: L = B→A data flow, H = A→B data flow (independent per 8-bit port)
2–3, 5–6, 8–9, 11–12, 13–14, 16–17, 19–20, 22–23	1B1–1B8, 2B1–2B8	B-port I/Os (5 V domain): bidirectional data pins with 3-state output control and Schmitt input
25, 48	OE1, OE2	Active-low output enable: H = high-impedance (3-state), L = enabled data path (per port)
26–27, 29–30, 32–33, 35–36, 37–38, 40–41, 43–44, 46–47	2A1–2A8, 1A1–1A8	A-port I/Os (3.3 V domain): bidirectional data pins with 3-state output control and Schmitt input
4, 10, 15, 21, 28, 34, 39, 45	VSS	Ground reference pins (8 total; all must be connected to system ground for stable operation)
7, 18	VDD1	5 V supply rail (B-port and control logic; must be ≥ VDD2 and powered first during startup)
31, 42	VDD2	3.3 V supply rail (A-port; must be powered after VDD1 and powered down before VDD1)

Key Features

Feature	Design Value
Dual-rail bidirectional level shifting	Enables asynchronous 3.3 V ↔ 5 V data exchange without external level translators or direction logic
Cold-spare I/O architecture	Allows unpowered redundant units to remain safely connected to live buses (VDD1 = VDD2 = 0 V) without signal corruption or current injection
Rad-hard QML-V qualification	Fully compliant with MIL-PRF-38535 Class V; radiation testing performed per MIL-STD-883 TM 1019 at high dose rate (50–300 rad/s)
Integrated 26 Ω series resistors	Eliminates need for external current-limiting resistors on each I/O, reducing PCB area and improving ESD robustness
Schmitt-triggered inputs	100 mV hysteresis ensures reliable signal capture in high-noise launch/vacuum environments with slow or noisy edges

Applications

Onboard Command & Data Handling (C&DH) Bus Bridge

Satellite Payload Interface Module

Use Scenario: Interfacing a radiation-tolerant 3.3 V FPGA-based telemetry processor with a legacy 5 V MIL-STD-1553 bus controller.

IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing asynchronous command/data transfer between voltage domains with deterministic timing (≤8 ns tPD).

Use Value: Eliminates discrete level-shifter arrays, reduces board area by >40%, and maintains full radiation tolerance across the interface layer.

Use Scenario: Connecting a 3.3 V scientific instrument sensor array to a 5 V power management unit (PMU) in a low-Earth orbit microsatellite.

IC Role / Device Role / Timing Role: Cold-spare-enabled bus transceiver allowing hot-swappable redundancy: one unit active, second held at VDD = 0 V until fault detection triggers switchover.

Use Value: Achieves continuous mission-critical data acquisition with zero bus interruption during failover; no additional isolation circuitry required.

Deep-Space Probe Telemetry Link

Radiation-Hardened Avionics Backplane

Use Scenario: Bridging a 3.3 V radiation-hardened microcontroller (RH-MCU) to a 5 V RF transceiver in a Mars rover communications subsystem.

IC Role / Device Role / Timing Role: Dual-supply transceiver operating across extended temperature (−55 °C to +125 °C) with guaranteed TID performance up to 100 krad(Si).

Use Value: Ensures uninterrupted telemetry transmission over multi-year missions where cumulative radiation exposure exceeds commercial-grade IC limits.

Use Scenario: Implementing a reconfigurable 16-bit data path between multiple 3.3 V and 5 V avionics modules on a radiation-hardened backplane.

IC Role / Device Role / Timing Role: Multi-purpose transceiver with independent DIR/OE per 8-bit segment, enabling dynamic bus topology reconfiguration via software control.

Use Value: Supports in-flight reprogramming and modular payload integration without hardware redesign or voltage translation bottlenecks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level-shifting transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
RHRAC164245K03V	Lid internally connected to ground (vs. floating in K1); identical electrical/radiation specs	Required when chassis grounding of lid is mandated by EMC or thermal design rules	Select K03V only if mechanical/EMC requirements specify grounded lid; otherwise K1 offers same performance with floating option.
54AC164245 (non-rad-hard commercial version)	No radiation qualification; not tested for TID, SEL, or SET; plastic package; lower temp range (−40 °C to +85 °C)	Restricted to ground-test equipment or non-flight terrestrial prototypes	Use only for bench validation or cost-sensitive non-space applications; never for flight hardware.

Compared with RHRAC164245K1, the K03V variant provides identical radiation hardness and timing but satisfies grounded-lid mechanical constraints, whereas the commercial 54AC164245 lacks all space-qualification evidence and cannot support mission-critical deployment.

Availability

RHRAC164245K1 is available at Aetrix Electronics and suitable for satellite command & data handling systems, deep-space probe telemetry links, and radiation-hardened avionics backplanes requiring stable component supply across long-duration programs.

Supply support for RHRAC164245K1 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 specializing in automotive, industrial, and aerospace-grade ICs, with extensive heritage in radiation-hardened technology for space missions.

RHRAC164245K1 belongs to ST's QML-V rad-hard transceiver product line, engineered specifically for high-reliability bidirectional bus bridging in extreme radiation environments such as geostationary orbit and interplanetary exploration.

FAQ

What is the correct power-up sequence for RHRAC164245K1?

VDD1 (5 V rail) must be powered up before VDD2 (3.3 V rail). During power-up, all /OE inputs must be held high to force outputs into high-impedance state until both supplies stabilize. This prevents bus contention and ensures deterministic initialization. Failure to follow this sequence risks undefined output states or increased current draw.

Can Port A and Port B operate at different voltages simultaneously?

Yes - Port A is designed for 2.3–3.6 V operation (VDD2), and Port B for 4.5–5.5 V operation (VDD1), with VDD1 required to be ≥ VDD2. This enables true 3.3 V ↔ 5 V bidirectional level shifting without external components. The device guarantees full AC/DC specifications across this mixed-voltage configuration.

Is cold-spare mode supported with only one supply grounded?

No - cold-spare operation requires both VDD1 and VDD2 to be at 0 V simultaneously. Using cold-spare on only Port A or Port B is explicitly prohibited. If only one rail is grounded while the other remains active, I/O leakage and potential bus contention may occur, violating the cold-spare safety guarantee.

What radiation test standards apply to RHRAC164245K1?

RHRAC164245K1 is qualified per MIL-PRF-38535 Class V and tested for total ionizing dose (TID) per MIL-STD-883 TM 1019 at high dose rates (50–300 rad/s), with full DC/AC parameter characterization pre- and post-irradiation up to 100 krad(Si). SEL immunity is verified up to 110 MeV·cm²/mg under specified heavy-ion conditions.

RHRAC164245K1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 48-CFlatPack

Packaging:: Strip

Product Status:: Active

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 8mA, 8mA

Voltage - Supply:: 2.3V ~ 3.6V, 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-CFlatPack

RHRAC164245K1 FAQ

1.How can I place an order for RHRAC164245K1 through Aetrix?

Please submit a Request for Quotation (RFQ) for RHRAC164245K1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for RHRAC164245K1 reliable?

The price and inventory of RHRAC164245K1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RHRAC164245K1 is usually 5 days.

3.What payment methods are accepted for RHRAC164245K1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RHRAC164245K1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RHRAC164245K1?

RHRAC164245K1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RHRAC164245K1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for RHRAC164245K1?

For technical support, including RHRAC164245K1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RHRAC164245K1 requirements.

6.How does Aetrix verify that RHRAC164245K1 is sourced from the original manufacturer or authorized distributors?

All RHRAC164245K1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that RHRAC164245K1 meets industry standards.

7.What is the process for return or replacement of RHRAC164245K1?

All RHRAC164245K1 units undergo pre-shipment inspection (PSI). If there is an issue with RHRAC164245K1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The RHRAC164245K1 part is unused and in its original packaging.

Return procedure for RHRAC164245K1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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