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Home > Products > Integrated Circuits (ICs) > Logic > Gates and Inverters

STMicroelectronics RHFAC00K1

Name: RHFAC00K1
Brand: STMicroelectronics
SKU: RHFAC00K1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RHFAC00K1

Manufacturer:: STMicroelectronics

Category:: Gates and Inverters

Package:: 14-CFlatPack

Datasheet:: RHFAC00K1.pdf

Description:: RAD-HARD QUAD 2-INPUT NAND GATE

Quantity:: RFQ Add To RFQ list

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Inventory:2,209

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Product details

Overview

RHFAC00K1 from STMicroelectronics is a radiation-hardened quad 2-input NAND gate in the 54AC logic family, designed for aerospace and high-reliability space systems. It operates from 2 V to 6 V (CMOS), delivers 300 krad(Si) TID hardness, is SEL-immune up to 110 MeV·cm²/mg, and functions across –55 °C to +125 °C in hermetic ceramic Flat-14 or DIL-14 packages.

For engineers reviewing the RHFAC00K1 datasheet, RHFAC00K1 pinout, RHFAC00K1 application, or RHFAC00K1 equivalent, this device serves as a drop-in rad-hard replacement for legacy 54AC00 functions in command decoding, telemetry conditioning, and fault-tolerant bus control where single-event immunity and extended temperature operation are mandatory.

Technical Context

The RHFAC00K1 implements four independent CMOS NAND gates with rail-to-rail output swing, TTL-compatible input thresholds at 5 V, and propagation delays under 8 ns at V_CC = 5 V. Its logic architecture uses standard AC-series complementary MOSFET pairs with no internal level-shifting or Schmitt-trigger hysteresis.

All inputs and outputs feature ESD protection diodes rated to ±2000 V HBM and clamp-current-limited I/O structures. The device is qualified to QML-V per MIL-PRF-38535, with wafer-level radiation testing performed under MIL-STD-883 cond A at 200 krad(Si)/hr.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2 V to 6 V - supports dual-voltage system interfacing and low-power operation down to 2 V without logic degradation.
TID Hardness	300 krad(Si) - guaranteed functional integrity after total ionizing dose exposure typical of GEO or deep-space missions.
SEL Threshold	≥110 MeV·cm²/mg - immune to single-event latch-up under worst-case heavy-ion fluence in proton-rich orbits.
Operating Temp	–55 °C to +125 °C - validated performance across full military temperature range without derating.
Package	Ceramic Flat-14 or DIL-14 - hermetically sealed, lead-free, QML-V qualified for long-term reliability in vacuum and thermal cycling.
Input Voltage	0 V to V_CC - rail-referenced logic thresholds ensure compatibility with both CMOS and TTL signal sources.
ESD Rating	±2000 V HBM - sufficient margin for handling and board-level integration in cleanroom and field-repair environments.

Pinout & Package

Ceramic Flat-14 and DIL-14 packages are used for RHFAC00K1, both featuring grounded metallic lid versions. Pin numbering follows JEDEC MS-012 standard: pins 1–7 on one side, 14–8 on the opposite, with pin 1 marked by notch or dot.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 8, 9, 11, 12	Input (A/B per gate)	Four independent NAND gates: Gate 1 (pins 1,2→3), Gate 2 (4,5→6), Gate 3 (8,9→10), Gate 4 (11,12→13).
3, 6, 10, 13	Output (Y per gate)	CMOS push-pull outputs capable of driving ≥10 LSTTL loads or 50 pF at 5 V with <8 ns propagation delay.
7	GND	Ground reference for all logic and power domains; electrically connected to grounded lid in selected variants.
14	V_CC	Primary supply rail; must be decoupled locally with ≥100 nF ceramic capacitor due to fast switching current transients.

Key Features

Feature	Design Value
Rad-Hard Logic Core	300 krad(Si) TID tolerance and SEL immunity up to 110 MeV·cm²/mg enable use in unshielded satellite electronics.
Wide Supply Range	2 V–6 V operation allows direct interface with 3.3 V microcontrollers and legacy 5 V avionics buses without level shifters.
Hermetic Ceramic Packaging	Flat-14/DIL-14 ceramic body prevents moisture ingress and outgassing, critical for vacuum stability and long-duration missions.
QML-V Qualification	Fully compliant with MIL-PRF-38535 Class V flow, including lot acceptance testing, burn-in, and radiation lot qualification.
Temperature Robustness	Guaranteed functionality from –55 °C to +125 °C without parameter drift or timing violation in thermal cycling environments.

Applications

Onboard Command Decoder

Satellite Telemetry Conditioning

Use Scenario: Decoding discrete command pulses from ground station uplinks into hardware reset, mode select, or payload activation signals.

IC Role / Device Role / Timing Role: Quad NAND performs active-low command validation, debouncing, and synchronous gating before routing to FPGA or microcontroller peripherals.

Use Value: Radiation immunity ensures no spurious command execution during solar particle events; wide V_CC range enables direct use with 3.3 V or 5 V command buses.

Use Scenario: Signal conditioning of analog sensor outputs (e.g., temperature, pressure) prior to ADC sampling in telemetry chains.

IC Role / Device Role / Timing Role: NAND gates implement window comparators, pulse stretching, and noise-filtering logic for analog front-end synchronization.

Use Value: Hermetic packaging prevents parameter shift in vacuum; –55 °C to +125 °C rating covers orbital thermal extremes without calibration drift.

Fault-Tolerant Bus Control

Redundant Power Sequencing

Use Scenario: Arbitrating access to shared MIL-STD-1553 or RS-422 data buses among redundant flight computers.

IC Role / Device Role / Timing Role: Implements priority encoder logic and bus-enable handshaking using NAND-based combinational control.

Use Value: SEL immunity prevents bus lockup during heavy-ion strikes; 300 krad(Si) TID rating supports >15-year GEO mission lifetimes.

Use Scenario: Generating sequenced enable signals for multi-rail power supplies (e.g., 12 V → 5 V → 3.3 V → 1.2 V) in FPGAs or processors.

IC Role / Device Role / Timing Role: NAND gates form monostable multivibrators and delay chains to enforce strict power-up/down timing margins.

Use Value: Stable propagation delay over temperature ensures repeatable sequencing across launch vibration and orbital thermal cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input NAND gate applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
54AC00 (non-RH, commercial)	No radiation hardening; max TID = 5 krad(Si); SEL not characterized.	Limited to ground-test, lab, or non-flight subsystems with shielding.	Select only for bench verification or non-space-qualified prototypes.
RHFAC00K1 (same part, alternate package)	Identical die and radiation specs; differs only in package outline (Flat-14 vs DIL-14).	DIL-14 preferred for through-hole prototyping; Flat-14 for surface-mount high-density layouts.	Choose based on PCB assembly method-not functional substitution.

Compared with 54AC00 and RHFAC00K1 (DIL-14), the RHFAC00K1 (Flat-14) offers identical radiation performance but enables higher board density and improved thermal dissipation via case-top conduction, making it optimal for compact, thermally constrained spacecraft modules.

Availability

RHFAC00K1 is available at Aetrix Electronics and suitable for onboard command decoder, satellite telemetry conditioning, fault-tolerant bus control, and redundant power sequencing requiring stable component supply across extended temperature and radiation environments.

Supply support for RHFAC00K1 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 over 30 years of rad-hard product development and QML-V qualification expertise.

RHFAC00K1 belongs to the 54ACxxxx rad-hard logic series, engineered specifically for high-reliability space electronics where immunity to total ionizing dose, single-event effects, and extreme thermal cycling is non-negotiable.

FAQ

Is RHFAC00K1 pin-compatible with standard 54AC00 devices?

Yes - RHFAC00K1 uses identical pinout and logic function as industry-standard 54AC00, including same Flat-14 and DIL-14 footprints. Electrical behavior matches except for enhanced radiation tolerance and extended voltage/temperature margins.

What is the maximum operating frequency of RHFAC00K1?

Maximum usable frequency depends on V_CC, load capacitance, and transition time. At V_CC = 5 V and C_L = 50 pF, typical propagation delay is 7.5 ns, supporting reliable operation up to ~35 MHz in controlled impedance environments.

Does RHFAC00K1 require external decoupling capacitors?

Yes - each V_CC pin must be decoupled with a minimum 100 nF X7R ceramic capacitor placed within 3 mm of the pin. Additional bulk capacitance (e.g., 10 µF tantalum) is recommended at the board-level power entry point.

Can RHFAC00K1 operate at 3.3 V supply?

Yes - RHFAC00K1 is fully specified from 2 V to 6 V. At 3.3 V, it maintains rail-to-rail output swing, meets AC timing specs, and retains full 300 krad(Si) TID hardness and SEL immunity per its QML-V qualification.

RHFAC00K1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 54AC

Package/Case:: 14-CFlatPack

Packaging:: Strip

Product Status:: Active

Logic Type:: NAND Gate

Number of Circuits:: 4

Number of Inputs:: 2

Features:: -

Voltage - Supply:: 2V ~ 6V

Current - Quiescent (Max):: -

Current - Output High, Low:: -

Input Logic Level - Low:: -

Input Logic Level - High:: -

Max Propagation Delay @ V, Max CL:: -

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-CFlatpack

RHFAC00K1 FAQ

1.How can I place an order for RHFAC00K1 through Aetrix?

Please submit a Request for Quotation (RFQ) for RHFAC00K1 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 RHFAC00K1 reliable?

The price and inventory of RHFAC00K1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RHFAC00K1 is usually 5 days.

3.What payment methods are accepted for RHFAC00K1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RHFAC00K1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RHFAC00K1?

RHFAC00K1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RHFAC00K1 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 RHFAC00K1?

For technical support, including RHFAC00K1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RHFAC00K1 requirements.

6.How does Aetrix verify that RHFAC00K1 is sourced from the original manufacturer or authorized distributors?

All RHFAC00K1 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 RHFAC00K1 meets industry standards.

7.What is the process for return or replacement of RHFAC00K1?

All RHFAC00K1 units undergo pre-shipment inspection (PSI). If there is an issue with RHFAC00K1, 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 RHFAC00K1 part is unused and in its original packaging.

Return procedure for RHFAC00K1:

1.Submit a request within 90 days.

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

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