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

Texas Instruments SNJ54HC174J

Name: SNJ54HC174J
Brand: Texas Instruments
SKU: SNJ54HC174J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54HC174J

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54HC174J.pdf

Description:: 54HC174 HEX D-TYPE FLIP-FLOPS WI

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Product details

Overview

SNJ54HC174J from Texas Instruments is a military-grade hex D-type positive-edge-triggered flip-flop with shared clock and asynchronous clear, operating across −55°C to +125°C, supporting 2–6 V supply, 6 MHz max clock frequency at 2 V, and 36 MHz at 6 V. It implements six independent storage elements used in synchronous logic control, register staging, and pattern sequencing in ruggedized digital systems.

For engineers reviewing the SNJ54HC174J datasheet, SNJ54HC174J pinout, SNJ54HC174J application, or SNJ54HC174J equivalent, this page delivers verified electrical specs, CDIP-16 package details, timing constraints (t_su = 17 ns, t_pd = 14 ns @ 6 V), absolute maximum ratings, and direct alternatives for high-reliability design-in.

Technical Context

The SNJ54HC174J implements six identical D-type latches triggered on the rising edge of CLK, with a common active-low CLR that asynchronously resets all Q outputs to logic low regardless of clock state. Its CMOS architecture ensures rail-to-rail output swing, input thresholds scaled to V_CC, and immunity to floating inputs when unused pins are tied to V_CC or GND.

It operates under MIL-PRF-38535 Class B qualification, supports TTL-compatible drive (±4 mA @ 5 V), exhibits low static current (≤80 μA), and maintains defined timing across full military temperature range without derating - enabling use in avionics sequencers, radiation-tolerant telemetry buffers, and hardened test instrumentation.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage	2 V to 6 V - enables interoperability with 3.3 V and 5 V logic families and mixed-voltage board designs
Operating temperature	−55°C to +125°C - qualified for extended-range military, aerospace, and downhole applications
Max clock frequency	36 MHz at V_CC = 6 V - supports high-speed register transfer in real-time control loops
Propagation delay	14 ns typical (CLK to Q) at V_CC = 6 V - defines minimum cycle time for synchronous state machines
Output drive	±4 mA at 5 V - sufficient to directly drive 10 LSTTL loads without buffering
Input leakage	±1 μA max - prevents unintended logic transitions due to stray currents in high-impedance nodes
Power consumption	80 μA max I_CC - enables low-quiescent operation in battery-backed or power-constrained subsystems

Pinout & Package

SNJ54HC174J is housed in a 16-pin Ceramic Dual In-line Package (CDIP) with 24.38 mm × 6.92 mm body size, hermetically sealed for moisture resistance and thermal stability in harsh environments.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 7, 8	D₀–D₅ Data inputs	Asynchronous data sources for each flip-flop; must meet t_su/t_h relative to CLK↑
3, 6, 10, 11, 13, 14	Q₀–Q₅ Outputs	Registered outputs updated only on CLK↑; retain state between edges
9	CLR (active-low)	Asynchronous reset - forces all Q outputs low independently of CLK
15	CLK	Positive-edge-triggered global clock input shared by all six flip-flops
16	V_CC	Power supply pin - requires local 0.1 μF bypass capacitor per TI layout guidelines
8	GND	Ground reference - must be low-impedance connection to minimize switching noise

Key Features

Feature	Design Value
Positive-edge triggering	Ensures deterministic sampling of D inputs only at CLK rising transitions, eliminating metastability risk from asynchronous changes
Shared clock and clear	Reduces PCB routing complexity and control logic overhead versus discrete flip-flop implementations
TTL-compatible output drive	Direct interface to legacy 74LS/74ALS loads without level-shifting or buffer stages
Military temperature range	Validated operation over −55°C to +125°C eliminates need for thermal derating in embedded chassis
Low input current	Enables high-fanout bus driving without signal integrity degradation or excessive loading on upstream drivers

Applications

Buffer/Storage Registers	Shift Registers
Use Scenario: Holding intermediate computation results in a flight control computer's arithmetic pipeline during multi-cycle ALU operations. IC Role / Device Role / Timing Role: Six-bit parallel latch providing glitch-free data retention between instruction phases under synchronized CLK control. Use Value: Eliminates need for external SRAM or FPGA registers, reducing latency and component count in safety-critical path.	Use Scenario: Serializing telemetry words from a sensor fusion module before transmission over a MIL-STD-1553 bus interface. IC Role / Device Role / Timing Role: Cascaded D-flip-flop chain implementing right-shift functionality with synchronous load enable. Use Value: Provides deterministic bit alignment and timing margin control without requiring programmable logic resources.
Pattern Generators	Test Instrumentation
Use Scenario: Generating calibrated pulse sequences for automated functional testing of analog front-end circuits in ground support equipment. IC Role / Device Role / Timing Role: Configured as a 6-bit linear feedback shift register (LFSR) to produce pseudo-random test vectors. Use Value: Delivers repeatable, deterministic stimulus patterns with minimal firmware overhead and zero jitter accumulation.	Use Scenario: Capturing and holding status flags from multiple fault-monitoring comparators in a radiation-hardened power management unit. IC Role / Device Role / Timing Role: Synchronized sampling of comparator outputs at system initialization to establish baseline operational state. Use Value: Guarantees atomic snapshot capture across all monitored channels, preventing race conditions during startup diagnostics.

Buffer/Storage Registers

Shift Registers

Use Scenario: Holding intermediate computation results in a flight control computer's arithmetic pipeline during multi-cycle ALU operations.

IC Role / Device Role / Timing Role: Six-bit parallel latch providing glitch-free data retention between instruction phases under synchronized CLK control.

Use Value: Eliminates need for external SRAM or FPGA registers, reducing latency and component count in safety-critical path.

Use Scenario: Serializing telemetry words from a sensor fusion module before transmission over a MIL-STD-1553 bus interface.

IC Role / Device Role / Timing Role: Cascaded D-flip-flop chain implementing right-shift functionality with synchronous load enable.

Use Value: Provides deterministic bit alignment and timing margin control without requiring programmable logic resources.

Pattern Generators

Test Instrumentation

Use Scenario: Generating calibrated pulse sequences for automated functional testing of analog front-end circuits in ground support equipment.

IC Role / Device Role / Timing Role: Configured as a 6-bit linear feedback shift register (LFSR) to produce pseudo-random test vectors.

Use Value: Delivers repeatable, deterministic stimulus patterns with minimal firmware overhead and zero jitter accumulation.

Use Scenario: Capturing and holding status flags from multiple fault-monitoring comparators in a radiation-hardened power management unit.

IC Role / Device Role / Timing Role: Synchronized sampling of comparator outputs at system initialization to establish baseline operational state.

Use Value: Guarantees atomic snapshot capture across all monitored channels, preventing race conditions during startup diagnostics.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS174J	Bipolar TTL process; higher ICC (18 mA typ), lower speed (30 MHz max), 4.75–5.25 V only	Requires strict 5 V supply; unsuitable for mixed-voltage or low-power systems	Select when interfacing exclusively with legacy TTL logic and board-level power budget permits higher dissipation
SNJ54ACT174J	Advanced CMOS; faster t_pd (9 ns), higher drive (±24 mA), same V_CC range and temp rating	Higher output current may require series termination on long traces to prevent ringing	Prefer for new designs demanding tighter timing margins or driving heavier capacitive loads

Compared with SNJ54HC174J, SNJ54LS174J trades power efficiency and voltage flexibility for raw speed within 5 V systems, while SNJ54ACT174J extends performance headroom without sacrificing temperature or supply compatibility - making it ideal for next-generation hardened controllers where timing closure is critical.

Availability

SNJ54HC174J is available at Aetrix Electronics and suitable for avionics data acquisition, missile guidance logic, and satellite telemetry subsystems requiring stable component supply across extended product lifecycles.

Supply support for SNJ54HC174J 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 specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

The SNJ54HC174J belongs to TI's military-grade HC logic family, designed specifically for applications demanding guaranteed operation across extreme temperatures, radiation tolerance, and long-term supply assurance in mission-critical systems.

FAQ

What is the absolute maximum supply voltage for SNJ54HC174J?

The absolute maximum supply voltage for SNJ54HC174J is 7 V, as specified in Section 6.1 of the TI datasheet SCLS119E. Exceeding this rating - even momentarily - risks permanent device damage. For reliable operation, V_CC must remain within the recommended 2–6 V range, with 5 V being typical for TTL-compatible interfacing. The SNJ54HC174J must not be operated at 7 V in any condition.

Does SNJ54HC174J support hot-swap or live-insertion?

No, SNJ54HC174J does not support hot-swap or live-insertion. Its CDIP package lacks bus-hold or I^off circuitry, and applying V_CC while signals are present can cause latch-up or excessive current flow. TI explicitly requires all inputs to be held at valid logic levels (V_CC or GND) before power application. The SNJ54HC174J must be powered up in a controlled sequence with inputs stable prior to V_CC ramp.

Can SNJ54HC174J drive a 50-pF load at 25 MHz?

Yes, SNJ54HC174J can drive a 50-pF load at 25 MHz under recommended conditions. Per Section 6.6 of the datasheet, its typical t_pd remains ≤27 ns and f_max reaches 25 MHz at V_CC = 4.5 V with CL = 50 pF. Output rise/fall times (t_t) are ≤19 ns, ensuring clean edges into that load. However, layout must minimize trace inductance and include proper V_CC/GND decoupling near the SNJ54HC174J to maintain signal integrity.

Is SNJ54HC174J RoHS compliant?

No, SNJ54HC174J is not RoHS compliant. As confirmed in TI's Package Option Addendum, the SNJ54HC174J uses SnPb (tin-lead) lead finish and is marked "No" under RoHS. It is intended for military/aerospace applications where exemption from RoHS Directive 2011/65/EU applies. For RoHS-compliant alternatives, consider SN74HC174N (lead-free PDIP) or SN74HC174PWR (lead-free TSSOP), though these lack the −55°C to +125°C rating of the SNJ54HC174J.

What is the function of Pin 9 on SNJ54HC174J?

Pin 9 on SNJ54HC174J is the active-low asynchronous clear (CLR) input. When pulled low, it forces all six Q outputs (Pins 3, 6, 10, 11, 13, 14) to logic low immediately - independent of the clock signal. This function is critical for system initialization, error recovery, and deterministic state reset in safety-critical applications. The SNJ54HC174J requires CLR to be held high during normal operation to allow clocked data transfer.

SNJ54HC174J Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Function:: -

Type:: -

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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):: -

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SNJ54HC174J FAQ

1.How can I place an order for SNJ54HC174J through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54HC174J 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 SNJ54HC174J reliable?

The price and inventory of SNJ54HC174J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54HC174J is usually 5 days.

3.What payment methods are accepted for SNJ54HC174J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54HC174J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54HC174J?

SNJ54HC174J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54HC174J 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 SNJ54HC174J?

For technical support, including SNJ54HC174J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54HC174J requirements.

6.How does Aetrix verify that SNJ54HC174J is sourced from the original manufacturer or authorized distributors?

All SNJ54HC174J 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 SNJ54HC174J meets industry standards.

7.What is the process for return or replacement of SNJ54HC174J?

All SNJ54HC174J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54HC174J, 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 SNJ54HC174J part is unused and in its original packaging.

Return procedure for SNJ54HC174J:

1.Submit a request within 90 days.

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

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