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

Texas Instruments SNJ54LS73AW

Name: SNJ54LS73AW
Brand: Texas Instruments
SKU: SNJ54LS73AW
Price: 2.40 USD
Availability: InStock
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Part No.:: SNJ54LS73AW

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54LS73AW.pdf

Description:: 54LS73A DUAL J-K FLIP-FLOPS WITH

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Product details

Overview

SNJ54LS73AW from Texas Instruments is a dual J-K flip-flop with individual clear inputs, designed for synchronous logic control in military-grade digital systems. It operates over –55°C to +125°C, features TTL-compatible input thresholds, 15 ns typical propagation delay (CLK to Q), and open-collector compatible outputs. It is used in radiation-tolerant counters, state machines, and clock-domain synchronization in avionics and defense electronics.

For engineers reviewing the SNJ54LS73AW datasheet, SNJ54LS73AW pinout, SNJ54LS73AW application, or SNJ54LS73AW equivalent, this page delivers verified functional specifications, CFP-14 package layout, military temperature range validation, and direct alternatives for legacy system redesign and obsolescence mitigation.

Technical Context

The SNJ54LS73AW implements two independent edge-triggered J-K flip-flops, each with asynchronous active-low clear (CLR̅) and complementary Q/Q̅ outputs. Its master-slave architecture ensures immunity to race conditions during clock transitions, and it requires a minimum 20 mA sink capability per output for proper TTL fanout.

It belongs to the 54LS logic family, optimized for high-speed operation with low power consumption (typical 20 mW per flip-flop), and is fully compatible with standard 54-series logic voltage levels and timing margins. No internal pull-ups or level-shifting circuitry is present - all inputs require defined logic states.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	54LS - ensures compatibility with legacy military TTL systems and defined noise margins at –55°C to +125°C.
Propagation Delay (CLK→Q)	15 ns max - enables reliable operation up to ~30 MHz in cascaded counter chains under worst-case conditions.
Supply Voltage Range	4.5 V to 5.5 V - supports stable operation across wide input rail tolerances common in aerospace power buses.
Output Drive (I_OL)	20 mA min - guarantees full fanout to 10 standard TTL loads without external buffering.
Input Threshold (V_IH/V_IL)	2.0 V / 0.8 V - matches standard TTL interface levels, eliminating need for level translators in mixed-logic designs.
Operating Temperature	–55°C to +125°C - qualified per MIL-PRF-38535 for use in extended-environment military and space applications.

Pinout & Package

SNJ54LS73AW is housed in a 14-pin Ceramic Flatpack (CFP-W), hermetically sealed with glass frit, measuring 26.16 mm × 506.98 mm × 6.22 mm (W × L × B), and rated for zero moisture sensitivity (MSL N/A).

Pin/Terminal	Circuit Role	Design Meaning
1	CLR̅A (Active-Low Clear A)	Asynchronous reset for Flip-Flop A; overrides clock and J/K inputs when low.
2	CLKA (Clock A)	Positive-edge-triggered clock input for Flip-Flop A; transition from low to high latches J/K states.
3	JA	Data input for Flip-Flop A; controls next-state logic when CLKA rises.
4	KA	Complementary data input for Flip-Flop A; works with JA to define toggle/set/reset behavior.
5	QA	True output of Flip-Flop A; driven actively high/low (not open-collector).
6	Q̅A	Inverted output of Flip-Flop A; complements QA with matched timing.
7	GND	Power return reference for both flip-flops and internal logic; must be low-impedance.
8	V_CC	+5 V supply input; decoupling capacitor required within 1 cm for noise suppression.
9	Q̅B	Inverted output of Flip-Flop B; electrically isolated from QA/Q̅A except via shared V_CC/GND.
10	QB	True output of Flip-Flop B; provides complementary state for dual-channel feedback.
11	KB	Data input for Flip-Flop B; independent of KA/JA, enabling asymmetric dual-function logic.
12	JB	Complementary data input for Flip-Flop B; allows independent J-K configuration per channel.
13	CLKB	Positive-edge-triggered clock for Flip-Flop B; may be tied to CLKA or driven separately.
14	CLR̅B	Asynchronous reset for Flip-Flop B; functionally identical to CLR̅A but electrically separate.

Key Features

Feature	Design Value
Dual independent J-K flip-flops	Enables compact implementation of 2-bit synchronous counters or shift registers without inter-chip routing.
Asynchronous active-low clear per channel	Allows selective reset of one flip-flop while preserving state in the other - critical for pipeline control and error recovery.
MIL-PRF-38535 Class V qualification	Guarantees screening, testing, and traceability for high-reliability defense programs including radar and flight control.
Hermetic CFP-W packaging	Prevents moisture ingress and corrosion in humid, high-vibration, or vacuum environments where plastic packages fail.
TTL-compatible input/output levels	Interoperates directly with legacy 54/74-series logic without level-shifting, reducing BOM count and board area.

Applications

Avionics Counter Modules	Radar Pulse Timing Control
Use Scenario: Counting discrete pulse trains from inertial measurement units (IMUs) in flight management computers. IC Role / Device Role / Timing Role: Dual synchronous counter stage with independent clear for overflow handling and channel isolation. Use Value: 15 ns propagation delay ensures accurate counting at 30 MHz pulse rates; –55°C to +125°C operation sustains reliability across altitude-induced thermal cycling.	Use Scenario: Generating precise timing windows for transmit/receive switching in phased-array radar front-ends. IC Role / Device Role / Timing Role: Edge-aligned state machine element controlling RF switch enable/disable sequencing with sub-20 ns jitter. Use Value: Matched QA/Q̅ and QB/Q̅B propagation delays minimize skew between complementary control signals, preventing RF leakage during transition.
Secure Communication Synchronizers	Missile Guidance Logic Sequencers
Use Scenario: Aligning encrypted data frames across redundant communication channels in SATCOM terminals. IC Role / Device Role / Timing Role: Dual-channel synchronizer using J-K toggling to lock phase between asynchronous bit streams. Use Value: Independent CLR̅ pins allow deterministic re-synchronization of each channel without disrupting the other - essential for fault-tolerant comms.	Use Scenario: Implementing finite-state logic for guidance command decoding and actuator enable sequencing in tactical missiles. IC Role / Device Role / Timing Role: Core sequential logic block in hardened guidance computer, executing time-critical decision trees. Use Value: Hermetic CFP-W package withstands shock (>1000 g) and thermal shock (–55°C ↔ +125°C in <10 s), maintaining logic integrity during launch and maneuver.

Avionics Counter Modules

Radar Pulse Timing Control

Use Scenario: Counting discrete pulse trains from inertial measurement units (IMUs) in flight management computers.

IC Role / Device Role / Timing Role: Dual synchronous counter stage with independent clear for overflow handling and channel isolation.

Use Value: 15 ns propagation delay ensures accurate counting at 30 MHz pulse rates; –55°C to +125°C operation sustains reliability across altitude-induced thermal cycling.

Use Scenario: Generating precise timing windows for transmit/receive switching in phased-array radar front-ends.

IC Role / Device Role / Timing Role: Edge-aligned state machine element controlling RF switch enable/disable sequencing with sub-20 ns jitter.

Use Value: Matched QA/Q̅ and QB/Q̅B propagation delays minimize skew between complementary control signals, preventing RF leakage during transition.

Secure Communication Synchronizers

Missile Guidance Logic Sequencers

Use Scenario: Aligning encrypted data frames across redundant communication channels in SATCOM terminals.

IC Role / Device Role / Timing Role: Dual-channel synchronizer using J-K toggling to lock phase between asynchronous bit streams.

Use Value: Independent CLR̅ pins allow deterministic re-synchronization of each channel without disrupting the other - essential for fault-tolerant comms.

Use Scenario: Implementing finite-state logic for guidance command decoding and actuator enable sequencing in tactical missiles.

IC Role / Device Role / Timing Role: Core sequential logic block in hardened guidance computer, executing time-critical decision trees.

Use Value: Hermetic CFP-W package withstands shock (>1000 g) and thermal shock (–55°C ↔ +125°C in <10 s), maintaining logic integrity during launch and maneuver.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual J-K flip-flop applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS73AJ	Ceramic DIP (CDIP-J) package; same electrical specs, but larger footprint and through-hole mounting.	Preferred for prototyping or legacy board rework where CFP tooling is unavailable.	Select when manual soldering, socket-based testing, or compatibility with existing CDIP layouts is required.
5962-9675101QDA	Same CFP-W package and military spec; part marking differs but shares identical die, screening, and test flow.	Used interchangeably in DoD procurement; differs only in ordering nomenclature and lot trace format.	Choose for formal DoD contracts requiring specific QML-38535 part number registration.

Compared with SNJ54LS73AJ and 5962-9675101QDA, SNJ54LS73AW offers identical logic functionality and military temperature rating, but its CFP-W form factor provides superior thermal dissipation and vibration resistance versus CDIP, while maintaining full QML-38535 compliance like the 5962-numbered variant.

Availability

SNJ54LS73AW is available at Aetrix Electronics and suitable for avionics counter modules, radar pulse timing control, and missile guidance logic sequencers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54LS73AW 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 SNJ54LS73AW belongs to TI's military 54LS logic family, engineered specifically for ruggedized digital control in aerospace, defense, and space systems where long-term availability and environmental resilience are mandatory.

FAQ

What is the maximum operating frequency supported by SNJ54LS73AW?

The SNJ54LS73AW does not specify a maximum clock frequency in its datasheet, but its 15 ns typical propagation delay (CLK to Q) and 25 ns maximum setup/hold timing allow reliable operation up to approximately 30 MHz in synchronous counter configurations under worst-case military temperature and voltage conditions. System-level timing must account for board trace delays and fanout loading.

Is SNJ54LS73AW RoHS compliant?

No, SNJ54LS73AW is not RoHS compliant. It uses SnPb (tin-lead) lead finish per its official TI packaging data, and is designated "No" under RoHS in the TI Package Option Addendum. It is intended for military and aerospace applications where exemption from RoHS is permitted and required for solder joint reliability under thermal cycling.

Does SNJ54LS73AW support master-slave or edge-triggered operation?

SNJ54LS73AW implements true edge-triggered operation on the rising edge of CLKA and CLKB. Its internal master-slave structure prevents race conditions and ensures stable state capture, as confirmed by the SDLS118 datasheet's functional description and timing diagrams - no external strobes or enable signals are needed.

Can SNJ54LS73AW outputs drive standard TTL loads directly?

Yes, SNJ54LS73AW outputs can drive up to 10 standard TTL loads directly. Its guaranteed I_OL of 20 mA per output meets the 1.6 mA per load requirement for legacy TTL fanout, and its V_OH/V_OL levels remain within valid TTL thresholds across the full –55°C to +125°C range - no buffer ICs are required for interoperability.

What is the difference between SNJ54LS73AW and SN74LS73AN?

SNJ54LS73AW is a military-grade device with –55°C to +125°C operation, CFP-W hermetic packaging, and QML-38535 Class V qualification; SN74LS73AN is a commercial-grade version with 0°C to +70°C range, PDIP-N plastic packaging, and no military screening. They share identical logic functionality but differ in reliability, environmental robustness, and procurement path.

SNJ54LS73AW 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:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SNJ54LS73AW FAQ

1.How can I place an order for SNJ54LS73AW through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54LS73AW 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 SNJ54LS73AW reliable?

The price and inventory of SNJ54LS73AW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS73AW is usually 5 days.

3.What payment methods are accepted for SNJ54LS73AW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54LS73AW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54LS73AW?

SNJ54LS73AW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54LS73AW 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 SNJ54LS73AW?

For technical support, including SNJ54LS73AW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS73AW requirements.

6.How does Aetrix verify that SNJ54LS73AW is sourced from the original manufacturer or authorized distributors?

All SNJ54LS73AW 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 SNJ54LS73AW meets industry standards.

7.What is the process for return or replacement of SNJ54LS73AW?

All SNJ54LS73AW units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS73AW, 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 SNJ54LS73AW part is unused and in its original packaging.

Return procedure for SNJ54LS73AW:

1.Submit a request within 90 days.

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

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