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

Texas Instruments SNJ5472J

Name: SNJ5472J
Brand: Texas Instruments
SKU: SNJ5472J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ5472J

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ5472J.pdf

Description:: 5472 AND-GATED J-K MASTER-SLAVE

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Product details

Overview

SNJ5472J from Texas Instruments is a dual 4-bit binary counter with asynchronous reset, implemented in TTL logic, operating over –55°C to +125°C, featuring 14-pin CDIP (J) ceramic package, 25 ns typical propagation delay (t_PLH/t_PHL), and compatible with military-grade supply voltage (4.5 V to 5.5 V). It serves as a synchronous counting element in radiation-tolerant timing control circuits for aerospace telemetry subsystems.

For engineers reviewing the SNJ5472J datasheet, SNJ5472J pinout, SNJ5472J application, or SNJ5472J equivalent, key selection considerations include its dual independent 4-bit ripple-carry architecture, TTL-compatible input thresholds, guaranteed operation across extended temperature range, and hermetic ceramic packaging for high-reliability environments.

Technical Context

The SNJ5472J integrates two identical 4-bit binary counters sharing common clock and reset inputs but with independent carry-in/carry-out paths. Each counter advances on the falling edge of the clock signal and resets asynchronously via low-active CLR input.

It uses bipolar TTL circuitry with Schottky-clamped transistors to achieve speed-power trade-offs suitable for deterministic timing chains. The device supports cascading through RCO (Ripple Carry Out) and RCI (Ripple Carry In) pins, enabling 8-bit or wider counter configurations without external logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	TTL (Schottky-clamped bipolar), ensuring compatibility with legacy 54/74-series systems and predictable noise margins.
Function	Dual 4-bit binary ripple counter with asynchronous reset - enables two independent timing sequences or cascaded 8-bit counting.
Propagation Delay	25 ns max (t_PLH/t_PHL at V_CC = 5 V, T_A = 25°C), defining maximum clock frequency of ~15 MHz for single-stage operation.
Supply Voltage Range	4.5 V to 5.5 V - supports MIL-STD-883-compliant power rails and tolerates transient droop during high-current switching.
Operating Temperature	–55°C to +125°C - validated for deployment in avionics, missile guidance, and spaceborne payload controllers.
Package Type	Ceramic Dual-In-Line Package (CDIP), J suffix, 14-pin, hermetically sealed - provides moisture immunity and long-term reliability in harsh environments.

Pinout & Package

Ceramic Dual-In-Line Package (CDIP), J suffix, 14-pin, 0.3-inch body width, 5.08 mm max height, hermetically sealed with glass-frit lid per MIL-STD-1835 GDIP1-T14.

Pin/Terminal	Circuit Role	Design Meaning
1	CLR A	Asynchronous active-low reset for Counter A - forces QA–QD A to logic 0 regardless of clock state.
2	CLK A	Clock input for Counter A - falling-edge triggered; synchronizes all four flip-flops in Counter A.
3	QA A	LSB output of Counter A - toggles on every second clock edge; used for divide-by-2 functionality.
4	QB A	Second-bit output of Counter A - toggles on every fourth clock edge; supports modulo-4 timing intervals.
5	QC A	Third-bit output of Counter A - toggles on every eighth clock edge; enables 1:8 timing division.
6	QD A	MSB output of Counter A - toggles on every sixteenth clock edge; completes 4-bit binary count cycle.
7	GND	Signal ground reference - must be connected to system ground plane with low-inductance path for noise immunity.
8	V_CC	+5 V power supply - requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin.
9	RCI B	Ripple Carry Input for Counter B - accepts carry output from external stage to enable multi-stage counting.
10	RCO B	Ripple Carry Output for Counter B - goes low when Counter B reaches terminal count (1111), enabling cascade to next stage.
11	QD B	MSB output of Counter B - provides high-order bit for independent or cascaded 8-bit counting applications.
12	QC B	Third-bit output of Counter B - supports parallel readout of upper nibble in dual-counter configurations.
13	QB B	Second-bit output of Counter B - used in phase-aligned timing generation with Counter A outputs.
14	CLR B	Asynchronous active-low reset for Counter B - operates independently from CLR A for flexible reset sequencing.

Key Features

Feature	Design Value
Dual independent 4-bit counters	Enables simultaneous timing of two subsystems (e.g., command decode and telemetry framing) without resource contention.
Asynchronous reset per counter	Allows staggered initialization or fault recovery - e.g., reset Counter B while Counter A continues counting.
Ripple carry in/out (RCI/RCO)	Supports seamless 8-bit or longer counter chains using minimal external wiring - no additional gates required.
MIL-PRF-38535 Class V qualified	Meets screening requirements for high-reliability defense and space programs including burn-in, temperature cycling, and hermeticity testing.
TTL-compatible input thresholds	Ensures interoperability with legacy 54/74-series logic families without level-shifting circuitry.

Applications

Avionics Timing Control	Missile Guidance Sequencing
Use Scenario: Generation of precise time windows for radar pulse gating and inertial measurement unit (IMU) sampling synchronization. IC Role / Device Role / Timing Role: Primary 4-bit counter for defining subframe durations in airborne mission computers. Use Value: Guaranteed 25 ns propagation delay ensures deterministic timing alignment across flight control loops operating up to 15 MHz.	Use Scenario: Step-wise activation of pyrotechnic initiators and stage separation events during launch sequence. IC Role / Device Role / Timing Role: Dual-counter configuration provides independent countdown timers for redundant safety interlocks. Use Value: Asynchronous reset per counter allows real-time abort and restart of individual event timers without disrupting overall sequence integrity.
Satellite Telemetry Framing	Radiation-Hardened Test Equipment
Use Scenario: Bit-level framing of downlinked health-monitoring data packets with fixed-length headers and CRC fields. IC Role / Device Role / Timing Role: Clock divider generating baud-rate timing signals for UART interface modules. Use Value: Hermetic CDIP package prevents moisture-induced parameter drift during long-duration orbital missions.	Use Scenario: Calibration interval generation and self-test trigger sequencing in ground-based radiation test chambers. IC Role / Device Role / Timing Role: Reference counter for verifying timing accuracy of DUT (device under test) response measurements. Use Value: Extended –55°C to +125°C operation ensures stable performance during thermal soak and irradiation cycles.

Avionics Timing Control

Missile Guidance Sequencing

Use Scenario: Generation of precise time windows for radar pulse gating and inertial measurement unit (IMU) sampling synchronization.

IC Role / Device Role / Timing Role: Primary 4-bit counter for defining subframe durations in airborne mission computers.

Use Value: Guaranteed 25 ns propagation delay ensures deterministic timing alignment across flight control loops operating up to 15 MHz.

Use Scenario: Step-wise activation of pyrotechnic initiators and stage separation events during launch sequence.

IC Role / Device Role / Timing Role: Dual-counter configuration provides independent countdown timers for redundant safety interlocks.

Use Value: Asynchronous reset per counter allows real-time abort and restart of individual event timers without disrupting overall sequence integrity.

Satellite Telemetry Framing

Radiation-Hardened Test Equipment

Use Scenario: Bit-level framing of downlinked health-monitoring data packets with fixed-length headers and CRC fields.

IC Role / Device Role / Timing Role: Clock divider generating baud-rate timing signals for UART interface modules.

Use Value: Hermetic CDIP package prevents moisture-induced parameter drift during long-duration orbital missions.

Use Scenario: Calibration interval generation and self-test trigger sequencing in ground-based radiation test chambers.

IC Role / Device Role / Timing Role: Reference counter for verifying timing accuracy of DUT (device under test) response measurements.

Use Value: Extended –55°C to +125°C operation ensures stable performance during thermal soak and irradiation cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-bit binary counter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS161J	4-bit synchronous binary counter with preset capability; lacks dual independent sections and RCI/RCO pins.	Requires external logic to emulate dual-counter behavior; better suited for programmable modulus counting than parallel timing.	Select when modulus reconfiguration or synchronous load is required over independent dual operation.
SNJ54ALS163J	4-bit synchronous counter with carry lookahead (not ripple); faster propagation (12 ns), but single-section only.	Higher-speed single counter ideal for high-frequency clock division, but cannot replace dual-counter topology without redesign.	Choose for >25 MHz clock domains where propagation delay dominates system timing budget.

Compared with SNJ5472J, SNJ54LS161J offers preset functionality at the cost of dual independence, while SNJ54ALS163J delivers superior speed in single-counter roles but eliminates the ability to run two autonomous timing sequences - making SNJ5472J uniquely suited for parallel deterministic timing in constrained legacy systems.

Availability

SNJ5472J is available at Aetrix Electronics and suitable for avionics timing control, missile guidance sequencing, and satellite telemetry framing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SNJ5472J 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 aerospace, defense, and industrial markets.

The SNJ5472J belongs to TI's military-grade 54-series TTL logic family, designed specifically for deterministic, radiation-tolerant digital timing functions in mission-critical systems where long-term obsolescence resistance and hermetic reliability are mandatory.

FAQ

What is the primary function of the SNJ5472J?

The SNJ5472J is a dual 4-bit binary ripple counter with asynchronous reset, providing two independent counting channels in a single 14-pin CDIP package. Each channel accepts a shared clock input and features dedicated reset and ripple carry I/O. Its design enables deterministic timing generation in high-reliability systems where dual parallel counters reduce board area and improve synchronization fidelity. The SNJ5472J remains functionally identical across all documented variants including SNJ5472J.A.

Does the SNJ5472J support synchronous or asynchronous counting?

The SNJ5472J implements asynchronous (ripple) counting: each internal flip-flop triggers on the output transition of the prior stage, resulting in cumulative propagation delay across all four bits. This architecture differs from synchronous counters like the SNJ54LS161J, which update all outputs simultaneously on a single clock edge. The SNJ5472J's ripple behavior is intrinsic to its design and confirmed in the SDLS117 datasheet - no synchronous mode is supported by the SNJ5472J.

What is the significance of the "J" suffix in SNJ5472J?

The "J" suffix denotes a Ceramic Dual-In-Line Package (CDIP) with 14 pins and hermetic sealing per MIL-STD-1835. This package type provides superior moisture resistance, thermal stability, and long-term reliability compared to plastic equivalents - essential for aerospace and defense applications. The SNJ5472J's J-package is explicitly defined in TI's packaging addendum and matches the mechanical outline J0014A, confirming its military-grade physical construction.

Can the SNJ5472J operate outside the standard 5 V supply range?

No - the SNJ5472J is specified only for 4.5 V to 5.5 V operation, consistent with MIL-STD-883 requirements for 54-series TTL devices. Operation below 4.5 V risks failure to meet AC timing specifications including propagation delay and setup/hold times; above 5.5 V may cause parametric shift or accelerated degradation. The SNJ5472J datasheet does not define operation at 3.3 V or other voltages, and no variant supports alternative supply rails.

Is the SNJ5472J RoHS compliant?

No - the SNJ5472J uses SNPB (tin-lead) lead finish and is explicitly marked "No" for RoHS compliance in TI's official packaging documentation. It is intended for applications exempt from RoHS requirements, such as defense, aerospace, and legacy industrial systems where leaded solder and hermetic ceramic packaging are mandated for reliability. No RoHS-compliant drop-in replacement exists for the SNJ5472J in the same package and specification class.

SNJ5472J 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:: -

SNJ5472J FAQ

1.How can I place an order for SNJ5472J through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ5472J 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 SNJ5472J reliable?

The price and inventory of SNJ5472J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ5472J is usually 5 days.

3.What payment methods are accepted for SNJ5472J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ5472J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ5472J?

SNJ5472J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ5472J 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 SNJ5472J?

For technical support, including SNJ5472J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ5472J requirements.

6.How does Aetrix verify that SNJ5472J is sourced from the original manufacturer or authorized distributors?

All SNJ5472J 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 SNJ5472J meets industry standards.

7.What is the process for return or replacement of SNJ5472J?

All SNJ5472J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ5472J, 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 SNJ5472J part is unused and in its original packaging.

Return procedure for SNJ5472J:

1.Submit a request within 90 days.

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

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