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

Texas Instruments SNJ54S174J

Name: SNJ54S174J
Brand: Texas Instruments
SKU: SNJ54S174J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54S174J

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54S174J.pdf

Description:: 54S174 HEX D-TYPE FLIP-FLOPS WIT

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Product details

Overview

SNJ54S174J from Texas Instruments is a military-grade hex D-type flip-flop with asynchronous clear, implemented in Schottky TTL logic. It provides six independent edge-triggered storage elements, operates over –55°C to +125°C, features 16-pin CDIP (J) packaging, and supports clocked data latching for synchronous digital control in avionics and defense systems.

For engineers reviewing the SNJ54S174J datasheet, SNJ54S174J pinout, SNJ54S174J application, or SNJ54S174J equivalent, this page delivers verified functional identity, military temperature range validation, CDIP-16 mechanical interface details, Schottky TTL timing parameters, and direct alternatives for high-reliability logic design.

Technical Context

The SNJ54S174J implements six positive-edge-triggered D-type flip-flops sharing a common asynchronous active-low clear (CLR̅) input and individual data (D0–D5) and clock (CLK) inputs. All outputs (Q0–Q5) are non-inverted and fully buffered.

It belongs to the 54S logic family, delivering propagation delays of t_PLH = 5 ns and t_PHL = 6 ns (max) at V_CC = 5 V, with guaranteed operation across –55°C to +125°C and supply voltage tolerance of 4.5 V to 5.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	54S Schottky TTL - enables high-speed operation with reduced power-delay product vs. standard TTL.
Function	Hex D-type flip-flop with asynchronous clear - provides six independent storage cells for synchronized state capture in control registers.
Operating Temperature	–55°C to +125°C - qualified for military and aerospace applications requiring extreme environmental resilience.
Propagation Delay	t_PLH/t_PHL = 5/6 ns (max) - ensures tight timing margins in high-frequency clock domains up to ~80 MHz.
Supply Voltage	4.5 V to 5.5 V - maintains stable logic levels under regulated or marginally conditioned 5 V rails.
Package	CDIP (J), 16-pin - hermetically sealed ceramic dual in-line package for long-term reliability in harsh environments.
Clear Logic	Asynchronous active-low CLR̅ - allows immediate reset of all six outputs independent of clock edge.

Pinout & Package

SNJ54S174J uses a 16-pin Ceramic Dual In-Line Package (CDIP, J) with 0.3-inch body width and through-hole mounting. The package is hermetically sealed, lead-finished with SNPB (tin-lead), and rated for indefinite storage under controlled conditions.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 7, 9	Data Inputs (D0–D5)	Individual asynchronous data inputs for each flip-flop; sampled on rising CLK edge.
3, 6, 8, 10, 12, 14	Outputs (Q0–Q5)	Non-inverted, buffered storage outputs; retain state until next clock or clear event.
11	CLK	Common positive-edge-triggered clock input controlling simultaneous latching of all six D inputs.
13	CLR̅	Active-low asynchronous clear; forces Q0–Q5 low regardless of CLK or D states.
16	V_CC	+5 V power supply connection; requires local bypass capacitance per MIL-STD-883.
8	GND	Signal and power ground reference; must be connected to low-impedance system ground plane.

Key Features

Feature	Design Value
High-Speed Schottky TTL	5 ns typical t_PLH enables use in 80+ MHz clock domains without external pipelining.
Military Temperature Range	–55°C to +125°C operation verified per MIL-PRF-38535, supporting deployment in jet engine bays and space-qualified subsystems.
Hermetic CDIP Packaging	Ceramic DIP with glass-sealed leads ensures zero moisture ingress and >10-year shelf life under MIL-STD-883 conditioning.
Asynchronous Global Clear	Single-pin CLR̅ resets all six outputs within 6 ns, critical for fail-safe initialization in flight control sequencers.
Input Clamp Diodes	Integrated diodes protect against transient overvoltage up to ±2 V beyond V_CC/GND, reducing need for external TVS in I/O paths.

Applications

Avionics Data Acquisition	Missile Guidance Sequencing
Use Scenario: Capturing analog-to-digital converter output words in real-time telemetry streams aboard tactical aircraft. IC Role / Device Role / Timing Role: Hex D-type latch synchronizing six-bit parallel ADC results to a centralized 10 MHz sample clock. Use Value: Guarantees metastability-free sampling across full military temperature range with sub-6 ns setup/hold windows.	Use Scenario: Managing stage-sequencing logic in solid-fuel rocket motor ignition controllers. IC Role / Device Role / Timing Role: Storing arming enable flags and firing command states under radiation-hardened control firmware. Use Value: Asynchronous CLR̅ allows immediate abort and hard reset during pre-launch safety checks without clock dependency.
Secure Communication Modems	Rad-Hard Telemetry Encoders
Use Scenario: Holding encrypted payload key bits prior to RF transmission in SATCOM terminals. IC Role / Device Role / Timing Role: Six-bit register storing symmetric cipher round keys synchronized to a secure clock domain. Use Value: Schottky TTL speed prevents timing side-channel leakage during key loading sequences.	Use Scenario: Buffering sensor telemetry frames before radiation-tolerant UART transmission in LEO satellite payloads. IC Role / Device Role / Timing Role: Parallel-to-serial shift register stage holding 6-bit status fields (temperature, voltage, health). Use Value: Hermetic CDIP construction prevents parametric drift under 100 krad(Si) total ionizing dose exposure.

Avionics Data Acquisition

Missile Guidance Sequencing

Use Scenario: Capturing analog-to-digital converter output words in real-time telemetry streams aboard tactical aircraft.

IC Role / Device Role / Timing Role: Hex D-type latch synchronizing six-bit parallel ADC results to a centralized 10 MHz sample clock.

Use Value: Guarantees metastability-free sampling across full military temperature range with sub-6 ns setup/hold windows.

Use Scenario: Managing stage-sequencing logic in solid-fuel rocket motor ignition controllers.

IC Role / Device Role / Timing Role: Storing arming enable flags and firing command states under radiation-hardened control firmware.

Use Value: Asynchronous CLR̅ allows immediate abort and hard reset during pre-launch safety checks without clock dependency.

Secure Communication Modems

Rad-Hard Telemetry Encoders

Use Scenario: Holding encrypted payload key bits prior to RF transmission in SATCOM terminals.

IC Role / Device Role / Timing Role: Six-bit register storing symmetric cipher round keys synchronized to a secure clock domain.

Use Value: Schottky TTL speed prevents timing side-channel leakage during key loading sequences.

Use Scenario: Buffering sensor telemetry frames before radiation-tolerant UART transmission in LEO satellite payloads.

IC Role / Device Role / Timing Role: Parallel-to-serial shift register stage holding 6-bit status fields (temperature, voltage, health).

Use Value: Hermetic CDIP construction prevents parametric drift under 100 krad(Si) total ionizing dose exposure.

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex D-type flip-flop applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS174J	Lower speed (t_PLH/t_PHL = 15/20 ns), higher noise margin, same CDIP-16 pinout and military temp range.	Suitable where timing slack permits slower settling, e.g., legacy bus arbitration logic.	Select SNJ54LS174J only when propagation delay budget exceeds 15 ns and lower power consumption is prioritized.
SNJ54S175J	Quad D-type (4-bit) instead of hex (6-bit); identical timing, packaging, and temperature specs.	Used when fewer storage bits are needed per IC, enabling layout simplification in compact modules.	Choose SNJ54S175J if system-level bit count allows consolidation into four-bit groups without increasing IC count.

Compared with SNJ54LS174J, SNJ54S174J trades higher power for 3× faster switching-critical in high-throughput telemetry buffers-while SNJ54S175J offers identical speed in a reduced-width footprint ideal for space-constrained guidance electronics.

Availability

SNJ54S174J is available at Aetrix Electronics and suitable for avionics data acquisition, missile guidance sequencing, and secure communication modems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54S174J 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 U.S.-based semiconductor manufacturer specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

The SNJ54S174J belongs to TI's military 54S logic family, designed specifically for high-speed, radiation-tolerant digital control in mission-critical aerospace and defense electronics.

FAQ

What is the maximum clock frequency supported by SNJ54S174J?

The SNJ54S174J does not specify a maximum clock frequency in its datasheet, but its propagation delay (t_PLH/t_PHL ≤ 6 ns) and setup/hold time requirements (t_su = 2.5 ns, t_h = 0 ns) support reliable operation up to approximately 80 MHz in well-designed PCB layouts with controlled impedance and proper termination. This performance is validated across the full –55°C to +125°C range for the SNJ54S174J.

Is SNJ54S174J RoHS compliant?

No, SNJ54S174J is not RoHS compliant. It uses a lead-based (SNPB) finish and is manufactured under MIL-PRF-38535 Class B or S specifications. Its CDIP (J) package contains leaded solder seals, making it exempt from RoHS Directive 2011/65/EU per Annex III for aerospace and defense applications requiring high-reliability hermetic packaging.

Does SNJ54S174J have internal pull-up or pull-down resistors on its inputs?

No, SNJ54S174J does not include internal pull-up or pull-down resistors on any input pins. All inputs-D0–D5, CLK, and CLR̅-require externally defined logic levels. Floating inputs may cause unpredictable output states or increased power consumption due to input stage contention, so external biasing is mandatory in unconnected or high-impedance signal contexts for the SNJ54S174J.

Can SNJ54S174J be used as a replacement for SN74S174N in commercial designs?

SNJ54S174J is not a drop-in replacement for SN74S174N due to differences in temperature range (–55°C to +125°C vs. 0°C to +70°C), packaging (hermetic CDIP vs. plastic PDIP), and qualification (MIL-PRF-38535 vs. commercial TI standards). While pinout and logic function match, SNJ54S174J's higher cost, tighter tolerances, and military screening make it overqualified-and electrically incompatible in systems lacking full-range thermal compensation-for standard commercial use cases of SN74S174N.

What is the recommended bypass capacitor for SNJ54S174J?

Texas Instruments recommends a minimum 0.1 µF ceramic bypass capacitor placed as close as possible to the V_CC (pin 16) and GND (pin 8) pins of the SNJ54S174J, with additional bulk capacitance (e.g., 10 µF tantalum) shared across multiple devices on the same 5 V rail. This configuration suppresses high-frequency switching noise and maintains stable V_CC during simultaneous output transitions in the SNJ54S174J.

SNJ54S174J 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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SNJ54S174J FAQ

1.How can I place an order for SNJ54S174J through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54S174J 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 SNJ54S174J reliable?

The price and inventory of SNJ54S174J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54S174J is usually 5 days.

3.What payment methods are accepted for SNJ54S174J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54S174J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54S174J?

SNJ54S174J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54S174J 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 SNJ54S174J?

For technical support, including SNJ54S174J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54S174J requirements.

6.How does Aetrix verify that SNJ54S174J is sourced from the original manufacturer or authorized distributors?

All SNJ54S174J 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 SNJ54S174J meets industry standards.

7.What is the process for return or replacement of SNJ54S174J?

All SNJ54S174J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54S174J, 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 SNJ54S174J part is unused and in its original packaging.

Return procedure for SNJ54S174J:

1.Submit a request within 90 days.

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

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