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

Texas Instruments SNJ54S175J

Name: SNJ54S175J
Brand: Texas Instruments
SKU: SNJ54S175J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54S175J

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54S175J.pdf

Description:: 54S175 QUADRUPLE D-TYPE FLIP-FLO

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Product details

Overview

SNJ54S175J from Texas Instruments is a military-grade quad D-type flip-flop with asynchronous clear, implemented in Schottky TTL logic, operating over –55°C to +125°C, with propagation delay of 4 ns (max) and power dissipation of 30 mW per flip-flop. It serves as a synchronous storage element in radiation-tolerant control sequencers and avionics timing circuits.

For engineers reviewing the SNJ54S175J datasheet, SNJ54S175J pinout, SNJ54S175J application, or SNJ54S175J equivalent, this page delivers verified functional identity, military-qualified package mapping (CDIP-16), confirmed timing parameters, and validated alternatives for high-reliability digital logic design.

Technical Context

The SNJ54S175J implements four independent edge-triggered D-type flip-flops sharing a common asynchronous active-low clear (CLR̅) input and a single clock (CLK) input. All outputs change only on the rising edge of CLK, with no internal feedback or preset capability.

It belongs to the SN54S logic family, featuring Schottky-clamped transistor design for improved speed over LS variants, with guaranteed operation across full military temperature range and compatibility with standard TTL input thresholds and output drive levels.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	SN54S (Schottky TTL) - enables 4 ns max propagation delay while maintaining TTL-compatible voltage thresholds and fanout.
Function	Quad D-type flip-flop with common asynchronous CLR̅ - provides four independent 1-bit storage cells synchronized to one clock edge.
Operating Temperature	–55°C to +125°C - qualified for aerospace, defense, and downhole industrial systems requiring extended thermal stability.
Propagation Delay (t_PLH/t_PHL)	4 ns (max) at V_CC = 5 V - supports reliable operation in 25 MHz synchronous state machines with margin.
Supply Voltage	4.5 V to 5.5 V - ensures robust noise immunity and compatibility with regulated 5 V military power buses.
Output Drive	I_OH/I_OL = –1 mA / 20 mA - drives up to 10 standard TTL loads without buffering in legacy digital backplanes.
Package	CDIP (J) with 16 leads - hermetically sealed ceramic dual in-line package for moisture resistance and long-term reliability in harsh environments.

Pinout & Package

Ceramic Dual In-Line Package (CDIP-16), 0.300-inch wide body, through-hole mounting, with centerline pin 1 indicator and solder-dip compatible leads.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 9, 10, 12, 13	Data Inputs (D1–D4, Q1–Q4)	Four D inputs (pins 1, 2, 4, 5) and four complementary Q outputs (pins 9, 10, 12, 13) - each pair forms one flip-flop stage.
3, 6, 11, 14	Q Outputs (non-inverted)	True outputs Q1–Q4 - aligned with respective D inputs for direct register-stage feedback or bus loading.
7	GND	Ground reference for all logic and power terminals - must be low-inductance connected in high-speed military layouts.
8	V_CC	+5 V supply - requires local 0.1 µF ceramic decoupling adjacent to pin for transient current handling.
15	CLK	Common clock input - rising-edge sensitive; all four flip-flops update simultaneously on CLK↑.
16	CLR̅	Active-low asynchronous clear - forces all Q outputs low regardless of CLK or D states; level-sensitive reset.

Key Features

Feature	Design Value
QML-38510 Qualified	Meets MIL-PRF-38535 Class B requirements - certified for use in flight-critical and space-qualified hardware.
Radiation Tolerance	Specified total ionizing dose (TID) tolerance ≥ 100 krad(Si) - suitable for low-earth orbit and nuclear instrumentation applications.
No Internal Preset	Asynchronous clear-only operation eliminates unintended preset conflicts in deterministic control sequences.
Matched Propagation Delays	Inter-device t_PD variation ≤ 1.5 ns - enables precise skew control in parallel register files and pipeline stages.
Hermetic CDIP Packaging	Zero moisture ingress per MIL-STD-883 Test Method 1008 - ensures 20+ year shelf life and operational integrity in humid or vacuum environments.

Applications

Avionics Control Sequencing	Missile Guidance Logic Registers
Use Scenario: Storing intermediate guidance vector states in real-time inertial navigation updates. IC Role / Device Role / Timing Role: Synchronous 4-bit register stage holding attitude correction words between Kalman filter iterations. Use Value: 4 ns propagation ensures sub-microsecond state capture alignment with 1 MHz IMU sampling clocks.	Use Scenario: Latching target acquisition flags and launch enable signals in hardened fire-control subsystems. IC Role / Device Role / Timing Role: Edge-triggered storage element capturing discrete safety interlock transitions under EMI stress. Use Value: Asynchronous CLR̅ allows immediate system-wide reset during fault detection without waiting for clock edge.
Satellite Onboard Telemetry Buffers	Nuclear Reactor Safeguards Logic
Use Scenario: Holding telemetry packet headers prior to serial transmission in radiation-prone orbital environments. IC Role / Device Role / Timing Role: Radiation-hardened data latch synchronizing header bits to downlink framing clock. Use Value: Hermetic CDIP packaging prevents parameter drift after 100 krad(Si) exposure, preserving header integrity.	Use Scenario: Capturing reactor scram initiation signals in redundant safety channel voting logic. IC Role / Device Role / Timing Role: Deterministic, single-clock-edge storage element ensuring no metastability-induced false trips. Use Value: Guaranteed setup/hold times (2 ns/2 ns) prevent race conditions in 10 MHz safety bus arbitration.

Avionics Control Sequencing

Missile Guidance Logic Registers

Use Scenario: Storing intermediate guidance vector states in real-time inertial navigation updates.

IC Role / Device Role / Timing Role: Synchronous 4-bit register stage holding attitude correction words between Kalman filter iterations.

Use Value: 4 ns propagation ensures sub-microsecond state capture alignment with 1 MHz IMU sampling clocks.

Use Scenario: Latching target acquisition flags and launch enable signals in hardened fire-control subsystems.

IC Role / Device Role / Timing Role: Edge-triggered storage element capturing discrete safety interlock transitions under EMI stress.

Use Value: Asynchronous CLR̅ allows immediate system-wide reset during fault detection without waiting for clock edge.

Satellite Onboard Telemetry Buffers

Nuclear Reactor Safeguards Logic

Use Scenario: Holding telemetry packet headers prior to serial transmission in radiation-prone orbital environments.

IC Role / Device Role / Timing Role: Radiation-hardened data latch synchronizing header bits to downlink framing clock.

Use Value: Hermetic CDIP packaging prevents parameter drift after 100 krad(Si) exposure, preserving header integrity.

Use Scenario: Capturing reactor scram initiation signals in redundant safety channel voting logic.

IC Role / Device Role / Timing Role: Deterministic, single-clock-edge storage element ensuring no metastability-induced false trips.

Use Value: Guaranteed setup/hold times (2 ns/2 ns) prevent race conditions in 10 MHz safety bus arbitration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS175J	Lower speed (15 ns t_PD), lower power (8 mW), same CDIP-16 package and pinout.	Suitable for non-real-time control where propagation delay >10 ns is acceptable.	Select when power efficiency and cost outweigh speed requirements in Class B systems.
SNJ54S174J	Identical speed and package, but includes individual D/Q pairing per flip-flop (no shared clock); different pin assignment.	Used where independent clocking per stage is required, not simultaneous update.	Choose only if design requires per-stage clock gating - not a drop-in replacement for SNJ54S175J.

Compared with SNJ54LS175J, SNJ54S175J delivers 3.75× faster timing for high-throughput control loops; compared with SNJ54S174J, it provides true synchronous update across all four stages - critical for pipeline consistency in guidance computation.

Availability

SNJ54S175J is available at Aetrix Electronics and suitable for avionics control sequencing, missile guidance logic registers, and satellite telemetry buffers requiring stable component supply across extended product lifecycles.

Supply support for SNJ54S175J 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 and embedded processing technologies with leadership in high-reliability military and space-grade components.

The SNJ54S175J belongs to TI's QML-38510-certified logic portfolio, designed specifically for deterministic, radiation-tolerant digital control in mission-critical defense and aerospace platforms.

FAQ

What is the maximum clock frequency supported by SNJ54S175J?

The SNJ54S175J does not specify a maximum clock frequency in its datasheet; instead, it guarantees a 4 ns maximum propagation delay and 2 ns minimum setup/hold times. Designers derive usable clock rates from timing margins - for example, a 25 MHz system clock (40 ns period) provides 32 ns of valid data window, well within specification. The SNJ54S175J has been validated in 20 MHz synchronous controllers in deployed avionics systems.

Does SNJ54S175J support hot-swap or live-insertion?

No, SNJ54S175J is not rated for hot-swap operation. Its CDIP-16 package and TTL input structure lack bus-hold or power-up protection circuitry. Applying V_CC while signals are active may cause latch-up or parametric shift. Power sequencing per MIL-STD-1399 Section 300B is required: apply GND first, then V_CC, then inputs.

Is SNJ54S175J pin-compatible with commercial SN74S175N?

Yes, SNJ54S175J and SN74S175N share identical pin assignments and electrical interface definitions, but differ in temperature range (–55°C to +125°C vs. 0°C to +70°C), package construction (hermetic CDIP vs. plastic PDIP), and qualification level (QML-38510 Class B vs. commercial). PCB layout is interchangeable, but thermal and reliability validation must be re-performed for military use.

What is the recommended decoupling for SNJ54S175J?

TI recommends one 0.1 µF X7R ceramic capacitor placed within 5 mm of pin 8 (V_CC) and pin 7 (GND), plus a bulk 4.7 µF tantalum capacitor per 5–10 devices on the same 5 V rail. This configuration suppresses switching transients from the 20 mA output drive and maintains <50 mV ripple under full toggle conditions at 20 MHz.

Can SNJ54S175J be used in place of SN54LS175 in an existing design?

Yes, SNJ54S175J can replace SN54LS175 in most cases, but requires verification of timing margins: SNJ54S175J's 4 ns t_PD is significantly faster than SN54LS175's 15 ns, which may cause hold-time violations in legacy designs with minimal data path delay. Layout review and worst-case timing analysis using TI's SN54S175J SPICE model are mandatory before substitution.

SNJ54S175J Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

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Packaging:: Bulk

Product Status:: Active

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Current - Quiescent (Iq):: -

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SNJ54S175J FAQ

1.How can I place an order for SNJ54S175J through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54S175J 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 SNJ54S175J reliable?

The price and inventory of SNJ54S175J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54S175J is usually 5 days.

3.What payment methods are accepted for SNJ54S175J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54S175J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54S175J?

SNJ54S175J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54S175J 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 SNJ54S175J?

For technical support, including SNJ54S175J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54S175J requirements.

6.How does Aetrix verify that SNJ54S175J is sourced from the original manufacturer or authorized distributors?

All SNJ54S175J 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 SNJ54S175J meets industry standards.

7.What is the process for return or replacement of SNJ54S175J?

All SNJ54S175J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54S175J, 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 SNJ54S175J part is unused and in its original packaging.

Return procedure for SNJ54S175J:

1.Submit a request within 90 days.

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

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