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Texas Instruments SNJ54LS73AJ
- Part No.:
- SNJ54LS73AJ
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54LS73AJ.pdf
- Description:
- DUAL J-K FLIP-FLOPS WITH CLEAR A
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SNJ54LS73AJ from Texas Instruments is a dual J-K flip-flop with individual clear inputs, fabricated in bipolar LS (Low-Power Schottky) technology, operating over –55°C to +125°C, with propagation delay of 15 ns typical at VCC = 5 V, and compatible with TTL logic levels. It serves as a synchronous edge-triggered storage element in military-grade digital control, timing, and state-machine circuits.
For engineers reviewing the SNJ54LS73AJ datasheet, SNJ54LS73AJ pinout, SNJ54LS73AJ application, or SNJ54LS73AJ equivalent, this device is selected for high-reliability, wide-temperature digital logic where deterministic setup/hold timing, dual independent toggle capability, and hermetic ceramic packaging are required.
Technical Context
The SNJ54LS73AJ implements two identical, independently clocked J-K flip-flops, each with active-low asynchronous clear (CLR̅), non-inverting Q and inverting Q̅ outputs, and edge-triggered operation on the falling edge of CLK. Its LS-TTL input thresholds and output drive strength ensure interoperability with legacy 74LS and 54LS families.
Designed for military applications, it uses a ceramic dual-in-line package (CDIP) with solderable tin-lead (SNPB) leads, rated for full MIL-PRF-38535 Class B compliance, and supports system-level reliability under thermal cycling, shock, and vibration per MIL-STD-883.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-Power Schottky TTL) - ensures compatibility with legacy TTL systems and predictable DC noise margins. |
| Operating Temperature | –55°C to +125°C - enables deployment in aerospace, defense, and downhole industrial environments without derating. |
| Propagation Delay (tPLH/tPHL) | 15 ns typical at VCC = 5 V - defines maximum clock-to-output timing for synchronous state transitions in real-time control loops. |
| Supply Voltage Range | 4.5 V to 5.5 V - constrains use to regulated 5 V rails; excludes operation from unregulated or battery-derived supplies. |
| Input Thresholds (VIL/VIH) | 0.8 V / 2.0 V - guarantees robust noise immunity against ground bounce and crosstalk in dense PCB layouts. |
| Output Drive (IOL/IOH) | 8 mA / –0.4 mA - supports fan-out of up to 20 LS-TTL loads, enabling direct interconnection without buffers. |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), 14-pin, hermetically sealed with glass-frit lid (Package Drawing J0014A), 5.08 mm max height, 0.300 inch pitch, intended for through-hole mounting and high-reliability board assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CLR̅ | Active-low asynchronous clear for Flip-Flop 1 - forces Q1 = 0, Q̅1 = 1 regardless of clock or J/K state. |
| 2 | 1J | Data input J for Flip-Flop 1 - controls set behavior when CLK falls and K = 0. |
| 3 | 1K | Data input K for Flip-Flop 1 - controls reset behavior when CLK falls and J = 0. |
| 4 | 1CLK | Clock input for Flip-Flop 1 - triggers state update on falling edge only. |
| 5 | 1Q̅ | Inverted output of Flip-Flop 1 - complements Q1; used for feedback or complementary signal routing. |
| 6 | 1Q | Non-inverted output of Flip-Flop 1 - primary storage output for logic sequencing. |
| 7 | GND | Ground reference - must be low-impedance connection to minimize switching noise coupling. |
| 8 | VCC | +5 V power supply - requires local 0.1 µF ceramic decoupling adjacent to pin. |
| 9 | 2Q | Non-inverted output of Flip-Flop 2 - independent of Flip-Flop 1; enables dual-channel state tracking. |
| 10 | 2Q̅ | Inverted output of Flip-Flop 2 - provides complementary logic for differential signaling or reset logic. |
| 11 | 2CLK | Clock input for Flip-Flop 2 - electrically isolated from 1CLK; allows independent timing domains. |
| 12 | 2K | Data input K for Flip-Flop 2 - enables independent J-K control per channel. |
| 13 | 2J | Data input J for Flip-Flop 2 - supports separate data loading for dual-state machines. |
| 14 | 2CLR̅ | Active-low asynchronous clear for Flip-Flop 2 - fully independent of 1CLR̅ for fault-isolated reset. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent J-K flip-flops | Enables two parallel synchronous state elements in one IC - reduces board space and interconnect complexity vs. discrete FFs. |
| Falling-edge clock triggering | Ensures deterministic sampling window aligned to system clock's negative transition - critical for metastability control in async-to-sync interfaces. |
| Individual active-low clear inputs | Allows selective reset of either flip-flop without affecting the other - essential for partial state recovery in fault-tolerant controllers. |
| MIL-PRF-38535 Class B qualification | Guarantees screening, testing, and traceability per military reliability standards - required for flight-critical and defense electronics programs. |
| Hermetic CDIP packaging | Prevents moisture ingress and long-term parameter drift - extends functional lifetime beyond 20 years in sealed enclosures. |
Applications
| Avionics Timing Control | Secure Communication Synchronization |
|---|---|
|
Use Scenario: Generating synchronized enable pulses for ADC sampling and DAC update cycles in airborne inertial navigation units. IC Role / Device Role / Timing Role: Dual-edge-triggered storage element providing phase-aligned Q/Q̅ outputs to gate analog conversion clocks. Use Value: 15 ns propagation delay and –55°C to +125°C operation ensure deterministic timing across flight envelope extremes. |
Use Scenario: Implementing scrambler/descrambler state registers in encrypted telemetry links between ground station and satellite transponders. IC Role / Device Role / Timing Role: Synchronous J-K register maintaining LFSR seed state with independent clear for key reinitialization. Use Value: Individual CLR̅ pins allow secure zeroization of one channel without disturbing the other - meeting NSA Type 1 crypto reset requirements. |
| Nuclear Plant Safety Logic | Tactical Radar Pulse Shaping |
|
Use Scenario: Storing trip-condition latches in reactor protection system (RPS) cabinets where fail-safe state retention is mandated. IC Role / Device Role / Timing Role: Asynchronous-clear-capable memory cell holding safety-critical status bits with hardware-enforced reset priority. Use Value: Hermetic CDIP packaging and MIL-qualified screening prevent latent failures under gamma radiation exposure. |
Use Scenario: Controlling pulse repetition interval (PRI) selection in phased-array radar modulators via programmable divider chains. IC Role / Device Role / Timing Role: Cascadable J-K stage in multi-modulus counter architecture, toggling on falling clock edges for precise PRI resolution. Use Value: LS-TTL-compatible drive strength ensures clean signal integrity into subsequent ECL or PECL interface stages. |
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 |
|---|---|---|---|
| SN54LS73AJ | Identical electrical specs and pinout; differs only in part marking and internal lot traceability per MIL-PRF-38535 revision level. | No functional difference; accepted interchangeably in Class B and Class S programs per TI documentation. | Select SN54LS73AJ if procurement requires latest revision trace code or specific DSCC drawing number alignment. |
| SNJ54LS73AW | Same logic function and temperature range, but in flatpack CFP-14 package (0.300″ body width, gull-wing leads) instead of CDIP. | Requires surface-mount assembly and different PCB land pattern; unsuitable for through-hole legacy boards. | Choose SNJ54LS73AW only when board layout mandates surface-mount footprint and thermal profile supports CFP reflow. |
Compared with SN54LS73AJ and SNJ54LS73AW, the SNJ54LS73AJ offers identical logic behavior and military temperature performance but is uniquely specified with CDIP packaging for through-hole reliability-critical systems - making it the sole choice when hermeticity, manual repairability, and legacy socket compatibility are mandatory.
Availability
SNJ54LS73AJ is available at Aetrix Electronics and suitable for avionics timing control, secure communication synchronization, and nuclear plant safety logic requiring stable component supply across extended product lifecycles.
Supply support for SNJ54LS73AJ 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, aerospace, and defense markets.
The SNJ54LS73AJ belongs to TI's military-grade 54LS logic family, engineered for deterministic digital sequencing in mission-critical systems where parameter stability across extreme temperature and radiation environments is non-negotiable.
FAQ
What is the maximum clock frequency supported by the SNJ54LS73AJ?
The SNJ54LS73AJ does not specify a maximum clock frequency in its datasheet; instead, it guarantees a minimum clock pulse width (tW) of 20 ns and setup/hold times of 20 ns/5 ns respectively. Engineers must derive usable frequency from propagation delay (15 ns typical) and timing margins - practical operation is limited to ≤20 MHz in well-designed systems with controlled trace lengths and termination.
Does the SNJ54LS73AJ support master-slave or transparent latch operation?
No, the SNJ54LS73AJ implements edge-triggered J-K flip-flop behavior only - it has no transparent mode or master-slave internal structure. Its outputs change only on the falling edge of CLK, and inputs are sampled exclusively at that instant; J and K states between edges have no effect on stored state.
Can the SNJ54LS73AJ be used in place of the SN74LS73AN in commercial applications?
No - the SNJ54LS73AJ is rated for –55°C to +125°C and built in hermetic CDIP packaging with SNPB leads, while the SN74LS73AN operates from 0°C to +70°C in plastic DIP with RoHS-compliant finish. Substituting SNJ54LS73AJ into commercial designs introduces unnecessary cost, lead-time, and soldering process complexity without functional benefit.
Is the SNJ54LS73AJ pin-compatible with the SN5473 or SN54LS73A?
Yes - the SNJ54LS73AJ shares identical pinout, electrical specifications, and functional behavior with SN5473 and SN54LS73A per SDLS118 datasheet. All three are dual J-K flip-flops in 14-pin CDIP with identical terminal assignments and timing parameters; SNJ54LS73AJ is a TI-manufactured variant meeting the same military specification.
What is the meaning of "SNJ" prefix in SNJ54LS73AJ?
The "SNJ" prefix denotes a Texas Instruments-manufactured device qualified to MIL-PRF-38535 Class B standards, with full DSCC traceability and screening per Method 5005. It distinguishes TI's own production from second-source versions and confirms compliance with military reliability, environmental, and documentation requirements - the SNJ54LS73AJ is not a generic or unqualified part.
SNJ54LS73AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54LS
- Package/Case:
- 14-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- JK Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 45 MHz
- Max Propagation Delay @ V, Max CL:
- 20ns @ 5V, 15pF
- Trigger Type:
- Negative Edge
- Current - Output High, Low:
- 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 6 mA
- Input Capacitance:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-CDIP
SNJ54LS73AJ FAQ
1.How can I place an order for SNJ54LS73AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LS73AJ 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 SNJ54LS73AJ reliable?
The price and inventory of SNJ54LS73AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS73AJ is usually 5 days.
3.What payment methods are accepted for SNJ54LS73AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54LS73AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54LS73AJ?
SNJ54LS73AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LS73AJ 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 SNJ54LS73AJ?
For technical support, including SNJ54LS73AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS73AJ requirements.
6.How does Aetrix verify that SNJ54LS73AJ is sourced from the original manufacturer or authorized distributors?
All SNJ54LS73AJ 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 SNJ54LS73AJ meets industry standards.
7.What is the process for return or replacement of SNJ54LS73AJ?
All SNJ54LS73AJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS73AJ, 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 SNJ54LS73AJ part is unused and in its original packaging.
Return procedure for SNJ54LS73AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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