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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SNJ54AHCT574W

Name: SNJ54AHCT574W
Brand: Texas Instruments
SKU: SNJ54AHCT574W
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54AHCT574W

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54AHCT574W.pdf

Description:: 54AHCT574 OCTAL EDGE-TRIGGERED D

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Product details

Overview

SNJ54AHCT574W from Texas Instruments is a military-grade octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface and data latching in high-reliability systems. It operates from –55°C to 125°C, supports 4.5 V to 5.5 V supply, features TTL-compatible inputs (V_IL = 0.8 V, V_IH = 2 V), and delivers ±8 mA output drive at 5 V.

For engineers reviewing the SNJ54AHCT574W datasheet, SNJ54AHCT574W pinout, SNJ54AHCT574W application, or SNJ54AHCT574W equivalent, this page provides verified functional mode behavior, timing constraints (t_su = 3.5 ns, t_h = 1.5 ns), 3-state enable control logic, and military-qualified thermal and ESD performance per MIL-PRF-38535.

Technical Context

The SNJ54AHCT574W implements eight independent D-type latches synchronized to the rising edge of CLK, with simultaneous 3-state control via active-low OE. Its CMOS architecture ensures low static current (I_CC ≤ 40 µA) while maintaining TTL voltage compatibility at inputs and robust drive capability into capacitive loads.

Each latch channel supports bidirectional bus isolation: when OE is high, all Q outputs enter high-impedance state regardless of CLK or D states; when OE is low, Q follows D on CLK↑. The device meets JESD 17 latch-up immunity (>250 mA) and exceeds JESD 22 ESD ratings (±2000 V HBM, ±1000 V CDM).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures stable operation across military-grade power rails with ±10% tolerance.
Operating Temperature	–55°C to +125°C - Qualified per MIL-PRF-38535 for extended environmental stress in avionics and defense systems.
Input Thresholds	V_IL = 0.8 V, V_IH = 2.0 V - Enables direct interfacing with legacy TTL logic without level-shifting circuitry.
Output Drive	±8 mA at V_CC = 5 V - Sufficient to drive 50-pF loads with controlled edge rates (Δt/Δv = 20 ns/V) minimizing ringing.
Propagation Delay	t_PLH/t_PHL = 5.5 ns (CL = 15 pF) - Supports 110 MHz maximum clock frequency in high-speed data capture applications.
Setup/Hold Time	t_su = 3.5 ns, t_h = 1.5 ns - Enables reliable sampling of fast-changing parallel data buses with minimal timing margin overhead.
ESD Protection	±2000 V HBM, ±1000 V CDM - Meets stringent handling requirements for assembly in controlled and uncontrolled environments.

Pinout & Package

SNJ54AHCT574W uses a 20-pin Ceramic Flatpack (CFP, W package) with 0.6-inch body width and 0.1-inch lead pitch. The package is hermetically sealed, rated for military temperature range, and compatible with wave soldering and reflow processes per MIL-STD-202.

Pin/Terminal	Circuit Role	Design Meaning
1	OE (Active-Low)	Global 3-state enable: high = all Q outputs high-Z; low = Q follows D on CLK↑.
2–9	1D–8D	Eight asynchronous data inputs; each directly controls corresponding latch input.
10	GND	Power return reference for all internal logic and output drivers.
11	CLK	Edge-sensitive clock input; rising edge transfers D to Q and enables output drive if OE is low.
12–19	8Q–1Q	Eight buffered, 3-state outputs; order reversed top-to-bottom in pinout diagram for PCB layout optimization.
20	V_CC	Positive supply rail; requires local 0.1 µF bypass capacitor per TI layout guidelines.

Key Features

Feature	Design Value
TTL-voltage compatible inputs	Enables direct connection to 3.3 V or 5 V TTL sources without external level shifters or pull-ups.
3-state outputs with common OE	Allows shared bus arbitration across multiple devices; eliminates contention risk when OE is deasserted.
Controlled output edge rate	Δt/Δv = 20 ns/V reduces overshoot/undershoot on long traces or unterminated lines in backplane designs.
MIL-PRF-38535 compliance	All parameters tested unless noted; includes full screening for radiation hardness, burn-in, and temperature cycling.
Latch-up immunity >250 mA	Guarantees fault tolerance under transient overvoltage or ground bounce events in high-noise platforms.

Applications

Avionics Data Acquisition	Defense System I/O Expansion
Use Scenario: Capturing sensor telemetry from analog-to-digital converters in flight control computers operating at –55°C to +125°C. IC Role / Device Role / Timing Role: Parallel data latch synchronizing ADC output words to system clock domain while isolating downstream processing logic. Use Value: Eliminates metastability risk via precise setup/hold timing (3.5 ns / 1.5 ns) and prevents bus contention using OE-controlled 3-state outputs.	Use Scenario: Expanding GPIO count on mission-critical vehicle control modules requiring radiation-tolerant components. IC Role / Device Role / Timing Role: Bidirectional bus buffer enabling secure read/write access to peripheral registers under real-time OS scheduling. Use Value: TTL-compatible inputs accept signals from legacy microcontrollers; ±8 mA drive sustains signal integrity across 15 cm PCB traces.
Secure Communication Backplanes	Ruggedized Industrial PLCs
Use Scenario: Isolating encrypted data paths between cryptographic processors and network interface ASICs in SATCOM terminals. IC Role / Device Role / Timing Role: High-impedance gatekeeper managing data flow direction and preventing leakage during key exchange handshakes. Use Value: Hermetic CFP package resists moisture ingress; 2000 V HBM rating protects against ESD during field maintenance.	Use Scenario: Interfacing industrial sensors (4–20 mA, RTD) to ARM-based controllers in oil & gas extraction equipment. IC Role / Device Role / Timing Role: Input register capturing status bits from isolated analog front-ends before DMA transfer to memory. Use Value: Guaranteed operation at 125°C ambient enables placement near heat-generating power stages without derating.

Avionics Data Acquisition

Defense System I/O Expansion

Use Scenario: Capturing sensor telemetry from analog-to-digital converters in flight control computers operating at –55°C to +125°C.

IC Role / Device Role / Timing Role: Parallel data latch synchronizing ADC output words to system clock domain while isolating downstream processing logic.

Use Value: Eliminates metastability risk via precise setup/hold timing (3.5 ns / 1.5 ns) and prevents bus contention using OE-controlled 3-state outputs.

Use Scenario: Expanding GPIO count on mission-critical vehicle control modules requiring radiation-tolerant components.

IC Role / Device Role / Timing Role: Bidirectional bus buffer enabling secure read/write access to peripheral registers under real-time OS scheduling.

Use Value: TTL-compatible inputs accept signals from legacy microcontrollers; ±8 mA drive sustains signal integrity across 15 cm PCB traces.

Secure Communication Backplanes

Ruggedized Industrial PLCs

Use Scenario: Isolating encrypted data paths between cryptographic processors and network interface ASICs in SATCOM terminals.

IC Role / Device Role / Timing Role: High-impedance gatekeeper managing data flow direction and preventing leakage during key exchange handshakes.

Use Value: Hermetic CFP package resists moisture ingress; 2000 V HBM rating protects against ESD during field maintenance.

Use Scenario: Interfacing industrial sensors (4–20 mA, RTD) to ARM-based controllers in oil & gas extraction equipment.

IC Role / Device Role / Timing Role: Input register capturing status bits from isolated analog front-ends before DMA transfer to memory.

Use Value: Guaranteed operation at 125°C ambient enables placement near heat-generating power stages without derating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AHCT574DW	Commercial-grade SOIC-20; rated only to –40°C to +125°C; no MIL-PRF-38535 testing.	Suitable for non-military industrial use where cost and RoHS compliance are prioritized over extended temperature or screening.	Select SN74AHCT574DW only if full military qualification, hermetic sealing, and –55°C operation are not required.
SNJ54ACT574W	ACT family variant: higher speed (t_PD ≈ 4.5 ns), but reduced noise margin (V_IH = 2.0 V, V_IL = 0.5 V); same CFP package.	Better suited for high-frequency synchronous buses where timing margin is critical and input noise immunity is managed externally.	Choose SNJ54ACT574W only when propagation delay <5 ns is mandatory and input signal integrity is guaranteed.

Compared with SN74AHCT574DW and SNJ54ACT574W, the SNJ54AHCT574W uniquely combines military temperature range, full MIL-PRF-38535 screening, and TTL-compatible thresholds-making it irreplaceable in avionics and defense systems where reliability under extreme conditions is non-negotiable.

Availability

SNJ54AHCT574W is available at Aetrix Electronics and suitable for avionics data acquisition, defense system I/O expansion, and secure communication backplanes requiring stable component supply across extended temperature and lifecycle demands.

Supply support for SNJ54AHCT574W 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability components for aerospace, defense, and industrial markets.

The SNJ54AHCT574W belongs to TI's military logic product line, engineered specifically for deterministic data capture and bus isolation in safety-critical systems operating under extreme thermal, mechanical, and electrical stress.

FAQ

What is the operating temperature range of the SNJ54AHCT574W?

The SNJ54AHCT574W is qualified for continuous operation from –55°C to +125°C per MIL-PRF-38535 specifications. This range is fully tested and guaranteed, including parametric validation at both extremes and thermal cycling over 1000 cycles. The SNJ54AHCT574W maintains specified timing, drive strength, and logic thresholds across this entire span without derating.

Does the SNJ54AHCT574W require external pull-up resistors on its outputs?

No, the SNJ54AHCT574W does not require external pull-up resistors on its outputs. Its 3-state outputs are actively driven high or low when enabled (OE low), and present high impedance (not floating) when disabled (OE high). Pull-ups are unnecessary unless interfacing with open-drain systems-a configuration not supported by the SNJ54AHCT574W's totem-pole output architecture.

How does the SNJ54AHCT574W handle input voltages above V_CC?

The SNJ54AHCT574W inputs are overvoltage tolerant up to 5.5 V regardless of V_CC value within the 4.5 V–5.5 V range. This allows safe interfacing with 5 V TTL sources even when V_CC is nominally 4.5 V, and prevents damage from transient overshoot. The specification is validated per absolute maximum ratings and confirmed in Section 5.1 of the official datasheet.

Is the SNJ54AHCT574W pin-compatible with commercial SN74AHCT574 variants?

No, the SNJ54AHCT574W is not pin-compatible with commercial SN74AHCT574 variants. While both use 20-pin packages, the SNJ54AHCT574W employs a ceramic flatpack (W package) with 0.1-inch lead pitch and 0.6-inch body width, whereas commercial versions use SOIC (DW), SSOP (DB), or TSSOP (PW) packages with different dimensions, lead forms, and thermal characteristics. PCB layout must be dedicated to the W package.

What is the maximum clock frequency supported by the SNJ54AHCT574W?

The SNJ54AHCT574W supports a maximum clock frequency of 110 MHz under recommended conditions (V_CC = 5 V, T_A = –55°C to +125°C, C_L = 50 pF), derived from its maximum propagation delay (t_PD) of 75 ns. At lighter loads (C_L = 15 pF), f_MAX increases to 130 MHz. These values are measured and guaranteed per Section 5.7 of the SCLS245N datasheet.

SNJ54AHCT574W Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Function:: -

Type:: -

Output Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Clock Frequency:: -

Max Propagation Delay @ V, Max CL:: -

Trigger Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Current - Quiescent (Iq):: -

Input Capacitance:: -

Operating Temperature:: -

Grade:: -

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SNJ54AHCT574W FAQ

1.How can I place an order for SNJ54AHCT574W through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54AHCT574W 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 SNJ54AHCT574W reliable?

The price and inventory of SNJ54AHCT574W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AHCT574W is usually 5 days.

3.What payment methods are accepted for SNJ54AHCT574W?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54AHCT574W transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54AHCT574W?

SNJ54AHCT574W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54AHCT574W 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 SNJ54AHCT574W?

For technical support, including SNJ54AHCT574W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AHCT574W requirements.

6.How does Aetrix verify that SNJ54AHCT574W is sourced from the original manufacturer or authorized distributors?

All SNJ54AHCT574W 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 SNJ54AHCT574W meets industry standards.

7.What is the process for return or replacement of SNJ54AHCT574W?

All SNJ54AHCT574W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AHCT574W, 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 SNJ54AHCT574W part is unused and in its original packaging.

Return procedure for SNJ54AHCT574W:

1.Submit a request within 90 days.

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

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