My Inquiry
My Account
Texas Instruments SNJ54LS73AFD
- Part No.:
- SNJ54LS73AFD
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SNJ54LS73AFD.pdf
- Description:
- J-K FLIP-FLOP
- Quantity:
- Payment:
- Shipping:
Inventory:104
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SNJ54LS73AFD from Texas Instruments is a dual J-K flip-flop with individual clear inputs, implemented in TTL-LS logic, operating over –55°C to +125°C, with propagation delay of 20 ns (max) at VCC = 5 V, and compatible with standard 14-pin logic footprints despite its 20-pin LCCC package. It serves as a synchronous edge-triggered storage element in radiation-tolerant military timing and control circuits.
For engineers reviewing the SNJ54LS73AFD datasheet, SNJ54LS73AFD pinout, SNJ54LS73AFD application, or SNJ54LS73AFD equivalent, key selection criteria include its military-grade temperature range, LCCC hermetic packaging, J-K toggle functionality per section, and compatibility with legacy 54LS logic families in avionics sequencers and hardened digital controllers.
Technical Context
The SNJ54LS73AFD implements two independent negative-edge-triggered J-K flip-flops, each with asynchronous active-low clear (CLR̅), no preset input, and complementary Q and Q̅ outputs. Its logic conforms to the 54LS family's voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and drive capability (IOL = 8 mA, IOH = –0.4 mA).
It operates strictly from a single 5-V supply, draws 19 mA typical ICC current, and uses bipolar transistor-transistor logic with Schottky clamping for speed-power optimization. The device lacks clock enable or master-slave synchronization beyond basic edge-triggered behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | TTL-LS: Ensures interoperability with legacy 54/74LS systems and predictable noise margins. |
| Operating Temperature | –55°C to +125°C: Qualified for extended-range military and aerospace environments. |
| Propagation Delay | 20 ns max (tPLH/tPHL): Defines maximum clock-to-output timing in synchronous state machines. |
| Supply Voltage | 5 V ±0.5 V: Requires tightly regulated rail; no wide-VCC operation or voltage scaling. |
| Output Drive | 8 mA sink / –0.4 mA source: Sufficient to drive one standard TTL input or two LS inputs directly. |
| Package Type | LCCC (FK): 20-terminal ceramic leadless chip carrier for hermetic sealing and thermal stability. |
Pinout & Package
LCCC-20 (Package Drawing FK), hermetically sealed ceramic package with solderable metallized terminations on all four edges; no leads, surface-mount only, requires reflow-compatible pad layout and controlled thermal profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 13, 14, 15, 16, 17, 18, 19, 20 | I/O or Power | 16 functional terminals: 2×(J,K,CLK,CLR̅,Q,Q̅) + VCC + GND - pin mapping follows TI FK outline with corner pin 1 marked. |
| 9, 12 | Ground | Dual GND pins (pins 9 & 12) reduce ground bounce and improve noise immunity in high-speed toggling. |
| 10 | VCC | Single 5-V supply connection; requires local 0.1 µF ceramic decoupling adjacent to pin 10. |
| 11 | No Connect | NC terminal - must remain unconnected; not internally bonded or tested. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent J-K sections | Enables two-bit synchronous state storage without external gating or sharing clock resources. |
| Asynchronous active-low clear | Allows immediate reset of each flip-flop regardless of clock phase - critical for fail-safe initialization. |
| Negative-edge clock triggering | Ensures deterministic sampling at falling clock transitions, simplifying timing analysis in multi-stage counters. |
| 54LS-compatible electrical specs | Guarantees drop-in replacement in existing 54LS-based designs without signal integrity or fanout recalculation. |
Applications
| Avionics Sequencing | Hardened Telemetry Control |
|---|---|
Use Scenario: Managing stage-sequencing logic in launch vehicle flight computers where deterministic reset and radiation tolerance are mandatory. IC Role / Device Role / Timing Role: Dual-bit edge-triggered storage element synchronizing ignition commands and sensor enable signals. Use Value: –55°C to +125°C operation and LCCC hermeticity ensure reliability under extreme thermal cycling and ionizing radiation exposure. | Use Scenario: Controlling telemetry packet framing and channel selection in satellite command receivers exposed to space radiation. IC Role / Device Role / Timing Role: J-K configuration used as divide-by-2 counter and status latch for downlink protocol handshaking. Use Value: 20 ns propagation delay enables precise timing alignment with 25 MHz command clocks while maintaining LS-family compatibility. |
| Military Radar Timing | Secure Crypto State Machine |
Use Scenario: Generating synchronized pulse delays and gate windows in airborne pulse-Doppler radar subsystems. IC Role / Device Role / Timing Role: Edge-triggered flip-flop pair implementing programmable delay chains and trigger synchronization. Use Value: Dual CLR̅ inputs allow simultaneous reset of timing paths during system recalibration without clock interruption. | Use Scenario: Storing internal state bits in tamper-resilient cryptographic key derivation engines deployed in secure comms hardware. IC Role / Device Role / Timing Role: Non-volatile state retention element (with external refresh) in finite-state machines resistant to glitch attacks. Use Value: LS logic thresholds and low IOH minimize power side-channel leakage during state transitions. |
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 | CDIP-14 package, same electrical specs and temperature range; 14-pin through-hole vs. 20-pin LCCC surface mount. | Suitable for lab prototyping and legacy board repair where socketing or manual assembly is preferred. | Select when mechanical mounting, serviceability, or compatibility with existing DIP footprints is required. |
| SN54LS73A | Same die, offered in multiple packages including CDIP and CFP; SN54LS73A is the generic part number, while SNJ54LS73AFD specifies FK package. | Broader availability across military-qualified packages but lacks LCCC-specific qualification documentation traceability. | Select when sourcing flexibility across package types is needed, accepting non-LCCC form factors. |
Compared with SNJ54LS73AFD, SNJ54LS73AJ offers through-hole assembly convenience at the cost of reduced hermeticity and higher thermal resistance, while SN54LS73A provides broader procurement options but requires explicit package verification to match LCCC requirements.
Availability
SNJ54LS73AFD is available at Aetrix Electronics and suitable for avionics sequencing, hardened telemetry control, and military radar timing requiring stable component supply across extended temperature ranges and long-lifecycle programs.
Supply support for SNJ54LS73AFD 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 logic solutions for industrial, automotive, and defense markets.
The SNJ54LS73AFD belongs to TI's military-grade 54LS logic family, designed specifically for high-reliability applications demanding extended temperature operation, radiation tolerance, and hermetic packaging in defense electronics.
FAQ
What is the function of the NC pin on SNJ54LS73AFD?
Pin 11 on SNJ54LS73AFD is designated No Connect (NC) and must remain unconnected in the PCB layout. It is not internally bonded to the die and has no electrical function. Leaving it floating or connecting it to any net may compromise device reliability or violate TI's qualification requirements for the LCCC package.
Does SNJ54LS73AFD support master-slave or transparent latch modes?
No, SNJ54LS73AFD implements only basic negative-edge-triggered J-K flip-flop behavior with asynchronous clear. It does not include master-slave architecture, clock enable, preset, or transparent latch functionality. Its operation strictly follows the 54LS73A logic diagram in SDLS118, with no additional modes beyond standard J-K toggle, set, reset, and hold.
What is the recommended decoupling for SNJ54LS73AFD?
A 0.1 µF ceramic capacitor must be placed as close as possible to pin 10 (VCC) and pin 9 or 12 (GND) to suppress high-frequency switching noise. TI's application guidance for LCCC logic devices specifies this value and placement to maintain stable operation under full toggle conditions across the –55°C to +125°C range.
Is SNJ54LS73AFD pin-compatible with standard 14-pin dual J-K flip-flops?
No, SNJ54LS73AFD uses a 20-pin LCCC (FK) package with different pin count, spacing, and layout than 14-pin DIP, SOIC, or CFP variants. While its logic function matches SN54LS73A, physical replacement requires PCB redesign due to incompatible footprint, pad geometry, and terminal arrangement.
What does the "SNJ" prefix indicate in SNJ54LS73AFD?
The "SNJ" prefix identifies the device as a Texas Instruments military-grade product meeting JAN (Joint Army-Navy) specifications, indicating full compliance with MIL-PRF-38535 requirements, including screening, testing, and traceability for Class B or Class S applications. It distinguishes SNJ54LS73AFD from commercial SN74LS73A or standard SN54LS73A variants.
SNJ54LS73AFD 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:
- -
SNJ54LS73AFD FAQ
1.How can I place an order for SNJ54LS73AFD through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LS73AFD 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 SNJ54LS73AFD reliable?
The price and inventory of SNJ54LS73AFD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS73AFD is usually 5 days.
3.What payment methods are accepted for SNJ54LS73AFD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54LS73AFD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54LS73AFD?
SNJ54LS73AFD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LS73AFD 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 SNJ54LS73AFD?
For technical support, including SNJ54LS73AFD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS73AFD requirements.
6.How does Aetrix verify that SNJ54LS73AFD is sourced from the original manufacturer or authorized distributors?
All SNJ54LS73AFD 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 SNJ54LS73AFD meets industry standards.
7.What is the process for return or replacement of SNJ54LS73AFD?
All SNJ54LS73AFD units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS73AFD, 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 SNJ54LS73AFD part is unused and in its original packaging.
Return procedure for SNJ54LS73AFD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SNJ54LS73AFD Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
