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

Texas Instruments SNJ54AC374J

Name: SNJ54AC374J
Brand: Texas Instruments
SKU: SNJ54AC374J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54AC374J

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54AC374J.pdf

Description:: 54AC374 OCTAL D-TYPE EDGE-TRIGGE

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Product details

Overview

SNJ54AC374 from Texas Instruments is a military-grade octal D-type edge-triggered flip-flop with 3-state noninverting outputs, operating from 2V to 6V V_CC, featuring 9.5ns max propagation delay at 5V and designed for bus-oriented I/O buffering in high-reliability aerospace and defense systems.

For engineers reviewing the SNJ54AC374 datasheet, SNJ54AC374 pinout, SNJ54AC374 application, or SNJ54AC374 equivalent, this device serves as a radiation-tolerant, wide-supply-voltage register for bidirectional data latching, bus driving, and working register functions in harsh-environment digital subsystems requiring deterministic timing and high-impedance output control.

Technical Context

The SNJ54AC374 implements eight independent D-type flip-flops triggered on the positive clock edge, with synchronous data capture and asynchronous 3-state output enable (OE) control. Its logic diagram confirms noninverting Q outputs and OE-driven high-impedance state independent of internal clock operation.

It supports full parallel loading across all eight bits, accepts input voltages up to 6V regardless of V_CC, and maintains specified timing (t_su = 4ns, t_h = 1.5ns, t_PLH/t_PHL ≤ 9.5ns at 5V) over −55°C to +125°C, meeting MIL-PRF-38535 Class V requirements for military applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2V to 6V - enables interoperability with mixed-voltage logic domains and robust operation under supply variation.
Max Propagation Delay	9.5ns at 5V - ensures sub-10ns timing margin for high-speed synchronous bus interfaces up to 100MHz.
Output Drive	±24mA at 5.5V - directly drives capacitive bus loads without external buffers or pull-ups.
Input Voltage Tolerance	Up to 6V - allows interfacing with legacy 5V TTL or overvoltage-safe inputs without level shifters.
Operating Temperature	−55°C to +125°C - qualified for extended-range military and space-grade embedded control systems.
3-State Enable Logic	Active-low OE - provides precise bus contention control and supports hot-swap-capable backplane designs.
Power Dissipation Capacitance	40pF - enables accurate dynamic power estimation in high-frequency clocked register applications.

Pinout & Package

SNJ54AC374 is packaged in a 20-pin Ceramic Dual-In-Line Package (CDIP, J package), 24.33mm × 9.4mm body size, with through-hole mounting and military-grade hermetic sealing.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Output Enable (active-low)	Asynchronously places all eight Q outputs into high-impedance state; does not affect internal flip-flop state or clocking.
2–9, 12, 15–19 (1Q–8Q)	Noninverting Data Outputs	Drive bus lines directly; each output independently controllable via shared OE; no external pull-up required.
3–4, 7–8, 13–14, 17–18 (1D–8D)	Data Inputs	Accept logic levels up to 6V; latch on rising CLK edge; tolerate floating inputs only when tied to V_CC or GND.
10 (GND)	Ground Reference	Primary return path for all I/O and internal logic; requires low-inductance connection to system ground plane.
11 (CLK)	Clock Input	Rising-edge sensitive; supports 100MHz max frequency at 5V; requires clean, monotonic transitions per TI layout guidelines.
20 (V_CC)	Power Supply	Supplies core logic and output drivers; requires local 0.1µF bypass capacitor placed adjacent to pin per TI recommendation.

Key Features

Feature	Design Value
Wide V_CC range (2V–6V)	Enables direct interface with 3.3V, 5V, and mixed-voltage systems without level translation circuitry.
3-state noninverting outputs	Eliminates need for external bus transceivers or pull-up resistors in shared-data-path architectures.
Full parallel access	Supports simultaneous loading of all eight bits, optimizing throughput in register-file and I/O port implementations.
MIL-PRF-38535 Class V qualification	Guarantees reliability, screening, and traceability for mission-critical defense electronics and space avionics.
Input voltage tolerance to 6V	Permits safe connection to legacy 5V TTL buses or overvoltage-protected signal sources without clamping diodes.

Applications

Aerospace Data Acquisition	Defense System I/O Port
Use Scenario: Capturing sensor telemetry from analog-to-digital converters in satellite payload controllers. IC Role / Device Role / Timing Role: Eight-bit parallel latch synchronizing ADC output words to spacecraft master clock domain. Use Value: 9.5ns propagation delay and −55°C to +125°C operation ensure deterministic sampling alignment in thermal-varying orbital environments.	Use Scenario: Isolating and buffering command-and-control signals between processor and peripheral modules in radar subsystems. IC Role / Device Role / Timing Role: Bidirectional bus driver with OE-controlled tristate enabling time-multiplexed read/write cycles on shared backplane. Use Value: ±24mA drive strength and 6V-tolerant inputs eliminate interface ICs, reducing BOM count and board area in SWaP-constrained radomes.
Military Vehicle Control Unit	Secure Communication Module
Use Scenario: Holding status flags and configuration registers in engine management ECUs exposed to extreme vibration and EMI. IC Role / Device Role / Timing Role: Working register storing real-time actuator states and fault codes with glitch-free updates on CLK rise. Use Value: Hermetic CDIP packaging and MIL-qualified screening provide immunity to moisture ingress and mechanical shock during field deployment.	Use Scenario: Managing encrypted data flow between cryptographic ASIC and RF transceiver in secure radio terminals. IC Role / Device Role / Timing Role: Synchronizing parallel key-stream data transfers while preventing bus contention during encryption/decryption handshakes. Use Value: Active-low OE allows precise timing of bus release before next cipher round, avoiding metastability in high-assurance crypto pipelines.

Aerospace Data Acquisition

Defense System I/O Port

Use Scenario: Capturing sensor telemetry from analog-to-digital converters in satellite payload controllers.

IC Role / Device Role / Timing Role: Eight-bit parallel latch synchronizing ADC output words to spacecraft master clock domain.

Use Value: 9.5ns propagation delay and −55°C to +125°C operation ensure deterministic sampling alignment in thermal-varying orbital environments.

Use Scenario: Isolating and buffering command-and-control signals between processor and peripheral modules in radar subsystems.

IC Role / Device Role / Timing Role: Bidirectional bus driver with OE-controlled tristate enabling time-multiplexed read/write cycles on shared backplane.

Use Value: ±24mA drive strength and 6V-tolerant inputs eliminate interface ICs, reducing BOM count and board area in SWaP-constrained radomes.

Military Vehicle Control Unit

Secure Communication Module

Use Scenario: Holding status flags and configuration registers in engine management ECUs exposed to extreme vibration and EMI.

IC Role / Device Role / Timing Role: Working register storing real-time actuator states and fault codes with glitch-free updates on CLK rise.

Use Value: Hermetic CDIP packaging and MIL-qualified screening provide immunity to moisture ingress and mechanical shock during field deployment.

Use Scenario: Managing encrypted data flow between cryptographic ASIC and RF transceiver in secure radio terminals.

IC Role / Device Role / Timing Role: Synchronizing parallel key-stream data transfers while preventing bus contention during encryption/decryption handshakes.

Use Value: Active-low OE allows precise timing of bus release before next cipher round, avoiding metastability in high-assurance crypto pipelines.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AC374N	Commercial-grade (−40°C to +85°C), same pinout and AC specs, RoHS-compliant NiPdAu finish.	Not qualified for military temperature range or screening; unsuitable for flight-critical systems.	Select for cost-sensitive industrial or test equipment where extended temperature and MIL-spec are unnecessary.
SNJ54ACT374J	TTL-compatible input thresholds (V_IH = 2.0V min), identical CDIP-20 package and military temp range.	Higher input current and slightly slower t_pd (10.5ns); optimized for legacy TTL bus interfacing.	Choose when interfacing with older 5V TTL logic families requiring guaranteed TTL-level recognition.

Compared with SNJ54AC374, SN74AC374N offers commercial cost and RoHS compliance but lacks military screening and extended temperature capability, while SNJ54ACT374J trades AC speed for guaranteed TTL input compatibility-making SNJ54AC374 optimal for new high-speed CMOS bus designs in defense platforms.

Availability

SNJ54AC374 is available at Aetrix Electronics and suitable for aerospace data acquisition, defense system I/O ports, military vehicle control units, and secure communication modules requiring stable component supply across long production lifecycles.

Supply support for SNJ54AC374 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 logic solutions for industrial, automotive, and defense markets.

The SNJ54AC374 belongs to TI's military logic family, engineered specifically for high-integrity digital subsystems demanding wide temperature operation, radiation-hardened design, and MIL-PRF-38535 compliance.

FAQ

What is the maximum clock frequency supported by SNJ54AC374 at 5V?

The SNJ54AC374 supports a maximum clock frequency of 100MHz at V_CC = 5V ± 0.5V, as verified in Section 4.6 of the TI SCAS543G datasheet. This rating applies across the full −55°C to +125°C operating range and assumes proper load conditions and clean clock edges per TI's recommended layout practices. The SNJ54AC374 achieves this performance with 4ns minimum pulse width and 4ns setup time requirements.

Does SNJ54AC374 require external pull-up resistors on its outputs?

No, SNJ54AC374 does not require external pull-up resistors on its outputs. Its 3-state noninverting outputs provide ±24mA drive capability at 5.5V and are designed to drive bus lines directly. TI explicitly states in the datasheet that the high-impedance state eliminates the need for interface or pullup components, and the outputs remain functional without external biasing when enabled.

Can SNJ54AC374 operate with a 3.3V supply voltage?

Yes, SNJ54AC374 operates reliably at 3.3V supply voltage. Its V_CC range is specified from 2V to 6V, and timing characteristics-including 60MHz maximum clock frequency and 5.5ns setup time-are guaranteed at V_CC = 3.3V ± 0.3V per Section 4.5 of the datasheet. Input voltage tolerance up to 6V further ensures compatibility with mixed-voltage signaling environments.

What is the function of the OE pin on SNJ54AC374?

The OE (Output Enable) pin on SNJ54AC374 is an active-low control that places all eight Q outputs simultaneously into a high-impedance state without affecting internal flip-flop operation. As confirmed in Section 6.3, OE has no impact on data retention or clocked updates-allowing new data to be loaded or old data retained while outputs are disabled. This enables safe bus sharing and hot-swap capability in backplane systems.

Is SNJ54AC374 pin-compatible with SN74AC374?

Yes, SNJ54AC374 is pin-compatible with SN74AC374 in the same CDIP-20 (J) package variant. Both share identical pin numbering, pin functions (including OE, CLK, Dn, Qn, V_CC, GND), and mechanical footprint. However, SNJ54AC374 adds military-grade screening, extended temperature range (−55°C to +125°C), and non-RoHS leaded finish-making it a drop-in replacement where environmental ruggedness is required.

SNJ54AC374J 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:: -

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SNJ54AC374J FAQ

1.How can I place an order for SNJ54AC374J through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54AC374J 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 SNJ54AC374J reliable?

The price and inventory of SNJ54AC374J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AC374J is usually 5 days.

3.What payment methods are accepted for SNJ54AC374J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54AC374J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54AC374J?

SNJ54AC374J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54AC374J 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 SNJ54AC374J?

For technical support, including SNJ54AC374J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AC374J requirements.

6.How does Aetrix verify that SNJ54AC374J is sourced from the original manufacturer or authorized distributors?

All SNJ54AC374J 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 SNJ54AC374J meets industry standards.

7.What is the process for return or replacement of SNJ54AC374J?

All SNJ54AC374J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AC374J, 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 SNJ54AC374J part is unused and in its original packaging.

Return procedure for SNJ54AC374J:

1.Submit a request within 90 days.

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

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