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

Texas Instruments SN54S174J

Name: SN54S174J
Brand: Texas Instruments
SKU: SN54S174J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN54S174J

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SN54S174J.pdf

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

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Product details

Overview

SN54S174J from Texas Instruments is a military-grade hex D-type flip-flop with asynchronous clear, implemented in TTL-Schottky logic. It contains six independent edge-triggered D flip-flops, operates over –55°C to +125°C, features 10 ns typical propagation delay (t_PLH/t_PHL), and drives ±20 mA loads. It is used in radiation-tolerant aerospace control registers and synchronous state machines requiring high-speed, wide-temperature reliability.

For engineers reviewing the SN54S174J datasheet, SN54S174J pinout, SN54S174J application, or SN54S174J equivalent, this page delivers verified electrical parameters, JEDEC-standard CDIP-16 package details, functional role in clock-synchronized data latching, and validated alternatives for legacy military system sustainment and obsolescence mitigation.

Technical Context

The SN54S174J implements six positive-edge-triggered D flip-flops sharing a common asynchronous active-low clear (CLR̅) input and individual D inputs. All outputs are buffered to drive standard TTL loads without external buffering.

It uses Schottky-clamped bipolar transistor technology to achieve higher speed and lower power-delay product than standard TTL or LS variants. Its timing behavior is specified under worst-case military temperature and voltage conditions (–55°C, V_CC = 4.5 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	TTL-Schottky (S-series); enables 10 ns propagation delay while maintaining TTL-compatible voltage thresholds.
Flip-Flop Count	6 independent D-type flip-flops; supports parallel data capture of 6-bit status or control words per clock edge.
Propagation Delay	10 ns max (t_PLH/t_PHL at V_CC = 5 V, T_A = 25°C); ensures tight timing margins in high-frequency synchronous control paths.
Operating Temperature	–55°C to +125°C; qualified for extended-range military and space applications without derating.
Supply Voltage	4.5 V to 5.5 V; compatible with regulated 5 V systems and tolerant of nominal rail variation in avionics power supplies.
Output Drive	–20 mA / +20 mA (I_OH/I_OL); directly interfaces with multiple standard TTL inputs without fanout limitation.
Clear Function	Asynchronous active-low CLR̅; resets all six flip-flops independently of clock, enabling immediate state initialization.

Pinout & Package

SN54S174J is supplied in a 16-pin Ceramic Dual In-line Package (CDIP) with JEDEC MO-001AC outline, hermetically sealed for high-reliability environments.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 7, 9	D₀–D₅ Inputs	Individual data inputs for each of six D flip-flops; sampled on rising clock edge.
3, 6, 8, 10, 12, 14	Q₀–Q₅ Outputs	True (non-inverted) registered outputs; fully buffered for direct TTL fanout.
11	CLK	Common clock input; positive-edge sensitive; internally synchronized to avoid metastability across all six stages.
13	CLR̅	Asynchronous master clear; active-low; forces all Q outputs low regardless of CLK or D states.
16	V_CC	Positive supply (4.5–5.5 V); decoupling capacitor required adjacent to pin for noise immunity.
8	GND	Signal ground reference; must be connected to low-impedance system ground plane.

Key Features

Feature	Design Value
High-Speed TTL-Schottky	10 ns typical propagation delay enables operation up to 30 MHz clock rates in deterministic logic paths.
Extended Temperature Range	–55°C to +125°C operation verified per MIL-STD-883, supporting deployment in jet engine controllers and satellite payload electronics.
Asynchronous Reset	Single-pin CLR̅ asserts immediately across all six flip-flops-critical for fail-safe system initialization and watchdog recovery.
Hermetic CDIP Packaging	Ceramic DIP (J package) provides moisture resistance, thermal stability, and long-term reliability in vacuum or high-humidity mission profiles.
TTL-Compatible I/O	Input thresholds and output voltage levels meet standard TTL specifications, ensuring seamless integration into legacy 5 V digital systems.

Applications

Avionics Flight Control Register	Satellite Telemetry Buffer
Use Scenario: Capturing and holding real-time sensor status (e.g., gyroscope lock, actuator position) across six channels in a fly-by-wire controller. IC Role / Device Role / Timing Role: Synchronous 6-bit register latching sampled data on each 10 MHz system clock edge, with immediate reset upon fault detection via CLR̅. Use Value: Guarantees deterministic setup/hold timing and radiation-hardened state retention without external latch ICs or FPGA logic resources.	Use Scenario: Temporarily storing telemetry packet header fields (e.g., subsystem ID, timestamp LSBs, error flags) before serial transmission. IC Role / Device Role / Timing Role: Hex D register providing parallel-to-serial interface staging; CLK aligned to telemetry frame sync signal, CLR̅ used for packet boundary reset. Use Value: Eliminates need for software-managed memory buffers; reduces microcontroller interrupt latency by offloading time-critical header capture.
Missile Guidance Logic State Store	Radar Signal Processing Pipeline Register
Use Scenario: Holding intermediate guidance computation results (e.g., azimuth correction, velocity delta) between processing stages in an inertial navigation unit. IC Role / Device Role / Timing Role: Six-bit storage element synchronized to guidance loop clock; CLR̅ tied to launch sequence enable to initialize all values pre-flight. Use Value: Ensures zero-initial-state determinism and eliminates race conditions during critical ignition-phase transitions.	Use Scenario: Aligning multi-channel ADC samples (e.g., I/Q radar returns) across six analog front-end channels prior to FFT processing. IC Role / Device Role / Timing Role: Simultaneous sampling register capturing six parallel ADC outputs on a common clock edge; outputs fed directly to FPGA or DSP data bus. Use Value: Maintains channel-to-channel phase coherence essential for beamforming accuracy; avoids skew-induced angular error.

Avionics Flight Control Register

Satellite Telemetry Buffer

Use Scenario: Capturing and holding real-time sensor status (e.g., gyroscope lock, actuator position) across six channels in a fly-by-wire controller.

IC Role / Device Role / Timing Role: Synchronous 6-bit register latching sampled data on each 10 MHz system clock edge, with immediate reset upon fault detection via CLR̅.

Use Value: Guarantees deterministic setup/hold timing and radiation-hardened state retention without external latch ICs or FPGA logic resources.

Use Scenario: Temporarily storing telemetry packet header fields (e.g., subsystem ID, timestamp LSBs, error flags) before serial transmission.

IC Role / Device Role / Timing Role: Hex D register providing parallel-to-serial interface staging; CLK aligned to telemetry frame sync signal, CLR̅ used for packet boundary reset.

Use Value: Eliminates need for software-managed memory buffers; reduces microcontroller interrupt latency by offloading time-critical header capture.

Missile Guidance Logic State Store

Radar Signal Processing Pipeline Register

Use Scenario: Holding intermediate guidance computation results (e.g., azimuth correction, velocity delta) between processing stages in an inertial navigation unit.

IC Role / Device Role / Timing Role: Six-bit storage element synchronized to guidance loop clock; CLR̅ tied to launch sequence enable to initialize all values pre-flight.

Use Value: Ensures zero-initial-state determinism and eliminates race conditions during critical ignition-phase transitions.

Use Scenario: Aligning multi-channel ADC samples (e.g., I/Q radar returns) across six analog front-end channels prior to FFT processing.

IC Role / Device Role / Timing Role: Simultaneous sampling register capturing six parallel ADC outputs on a common clock edge; outputs fed directly to FPGA or DSP data bus.

Use Value: Maintains channel-to-channel phase coherence essential for beamforming accuracy; avoids skew-induced angular error.

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
SN54LS174J	Lower speed (25 ns t_P), lower power (2 mW/flip-flop vs. 12 mW), same CDIP-16 package and pinout.	Suitable for cost-sensitive or thermally constrained military systems where 10 MHz max clock suffices.	Select SN54LS174J when power dissipation or timing margin allows slower operation; not drop-in for >15 MHz designs.
SNJ54S174J	Identical electrical specs and CDIP-16 packaging; differs only in TI's internal part numbering convention (SNJ prefix denotes QML-qualified version).	No functional difference; used interchangeably in new QML-38536-compliant designs requiring traceable qualification records.	SNJ54S174J is preferred for newly initiated defense programs requiring full QML documentation; SN54S174J remains valid for legacy BOMs.

Compared with SN54LS174J, SN54S174J delivers 2.5× faster timing at higher power; compared with SNJ54S174J, it shares identical performance but may differ in certificate traceability-both alternatives retain pin compatibility and logic function.

Availability

SN54S174J is available at Aetrix Electronics and suitable for aerospace flight control, satellite telemetry, missile guidance, and radar signal processing applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN54S174J 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 company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

The SN54S174J belongs to TI's military-grade TTL-Schottky logic family, designed specifically for high-speed, radiation-tolerant digital control in aerospace and defense systems where deterministic timing and extreme environmental resilience are mandatory.

FAQ

What is the maximum clock frequency supported by SN54S174J?

The SN54S174J has a typical propagation delay of 10 ns and minimum pulse width requirements that support reliable operation up to 30 MHz under nominal conditions. However, for guaranteed timing across the full –55°C to +125°C range and worst-case voltage (V_CC = 4.5 V), the recommended maximum clock frequency is 25 MHz. This ensures setup/hold margins are maintained in mission-critical SN54S174J deployments.

Is SN54S174J pin-compatible with SN54LS174J?

Yes, SN54S174J and SN54LS174J share identical CDIP-16 pinouts, terminal functions, and power/ground assignments. Both devices use the same pin mapping for D₀–D₅, Q₀–Q₅, CLK, and CLR̅. This allows direct PCB-level substitution in existing designs-though timing and drive strength differences must be verified in the target application.

Does SN54S174J require external pull-up resistors on its outputs?

No, SN54S174J does not require external pull-up resistors. Its totem-pole TTL-Schottky outputs provide active drive capability of –20 mA (sink) and +20 mA (source), fully compliant with standard TTL loading rules. External pull-ups would interfere with output voltage levels and are unnecessary for proper SN54S174J operation.

What is the meaning of the 'J' suffix in SN54S174J?

The 'J' suffix in SN54S174J denotes the Ceramic Dual In-line Package (CDIP) variant per TI's standard military packaging nomenclature. It specifies a hermetically sealed 16-pin ceramic DIP with flat leads, qualified to MIL-STD-883 and rated for –55°C to +125°C operation-distinct from plastic (N), SOIC (D), or CFP (W) variants of the same logic function.

Can SN54S174J be used in commercial-temperature applications?

Yes, SN54S174J is fully functional across 0°C to +70°C and can be used in commercial applications, though it is over-specified for that range. Its extended –55°C to +125°C rating, hermetic CDIP package, and QML screening make SN54S174J especially valuable in commercial systems requiring high reliability, such as medical imaging controllers or industrial test equipment operating near heat sources.

SN54S174J 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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Mounting Type:: -

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SN54S174J FAQ

1.How can I place an order for SN54S174J through Aetrix?

Please submit a Request for Quotation (RFQ) for SN54S174J 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 SN54S174J reliable?

The price and inventory of SN54S174J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54S174J is usually 5 days.

3.What payment methods are accepted for SN54S174J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54S174J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN54S174J?

SN54S174J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN54S174J 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 SN54S174J?

For technical support, including SN54S174J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54S174J requirements.

6.How does Aetrix verify that SN54S174J is sourced from the original manufacturer or authorized distributors?

All SN54S174J 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 SN54S174J meets industry standards.

7.What is the process for return or replacement of SN54S174J?

All SN54S174J units undergo pre-shipment inspection (PSI). If there is an issue with SN54S174J, 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 SN54S174J part is unused and in its original packaging.

Return procedure for SN54S174J:

1.Submit a request within 90 days.

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

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