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

Texas Instruments SNJ54LS378W

Name: SNJ54LS378W
Brand: Texas Instruments
SKU: SNJ54LS378W
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54LS378W

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54LS378W.pdf

Description:: D FLIP-FLOP, LS SERIES TTL

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Product details

Overview

SNJ54LS378W from Texas Instruments is a military-grade hex D-type flip-flop with enable, designed for synchronous data latching in high-reliability digital systems. It features 6 independent edge-triggered D-flip-flops, single active-low enable input (G̅), and operates over –55°C to +125°C. Used in avionics control registers and radiation-tolerant telemetry interfaces where deterministic timing and latch stability are critical.

For engineers reviewing the SNJ54LS378W datasheet, SNJ54LS378W pinout, SNJ54LS378W application, or SNJ54LS378W equivalent, this device serves as a temperature-hardened, CFP-packaged logic building block for mission-critical register storage, clock-domain synchronization, and state-holding in legacy TTL-compatible aerospace subsystems.

Technical Context

The SNJ54LS378W implements six identical D-type latches sharing a common active-low enable (G̅) and clock (CLK) input. Each flip-flop samples its D input on the rising edge of CLK only when G̅ is low; otherwise, outputs hold their previous state. No internal reset or preset is provided - operation is strictly synchronous and level-enabled.

Designed for direct compatibility with standard LS-TTL logic families, it drives ±8 mA at V_OH/V_OL, supports fan-out of 20 LS loads, and exhibits typical propagation delay of 20 ns (CLK to Q) at V_CC = 5 V. Its CFP-16 package ensures hermetic sealing and thermal stability across extended military temperature ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	LS-TTL - ensures interoperability with legacy 74LS-series systems without level-shifting.
Flip-Flop Count	6 independent D-type flip-flops - provides compact register storage for 6-bit parallel data paths.
Enable Control	Single active-low G̅ input - globally gates clock sampling across all six stages with one signal.
Operating Temperature	–55°C to +125°C - qualified for use in airborne, spaceborne, and ground-based military platforms.
Propagation Delay	20 ns max (CLK to Q) - enables reliable operation up to 25 MHz clock rates in synchronous designs.
Supply Voltage	4.5 V to 5.5 V - maintains stable logic thresholds under regulated 5 V military power rails.
Output Drive	±8 mA - sufficient to drive multiple LS-TTL inputs or small capacitive loads without buffering.

Pinout & Package

SNJ54LS378W is housed in a 16-pin Ceramic Flatpack (CFP-W), hermetically sealed with glass-metal lid and gold-plated leads for corrosion resistance and solderability in harsh environments.

Pin/Terminal	Circuit Role	Design Meaning
1	G̅ (Enable)	Active-low global enable - must be low for any flip-flop to respond to CLK edge.
2–7	D1–D6	Data inputs - asynchronous inputs sampled on rising CLK edge when G̅ = low.
8	GND	Ground reference - required for proper biasing and noise immunity.
9–14	Q1–Q6	True outputs - latch and hold D-input values after CLK transition when enabled.
15	CLK	Clock input - rising-edge triggered; all six flip-flops sample simultaneously.
16	V_CC	Positive supply - 4.5 V to 5.5 V nominal; decoupling capacitor required near pin.

Key Features

Feature	Design Value
Hermetic CFP packaging	Enables long-term reliability in vacuum, high-humidity, or thermally cycling environments typical of defense electronics.
Synchronous 6-bit register	Reduces component count vs. discrete DFFs - simplifies layout and improves timing correlation across bits.
Single-enable architecture	Minimizes control signal routing - allows centralized gating of register updates in real-time control loops.
LS-TTL compatible I/O	Direct drop-in replacement for SN54LS378J and SN74LS378 variants without interface redesign.
Military temperature range	Eliminates need for external thermal management in uncontrolled chassis or external mounting locations.

Applications

Avionics Data Acquisition	Secure Communication Buffering
Use Scenario: Capturing sensor telemetry (e.g., pressure, temperature, attitude) from analog-to-digital converters before transmission via MIL-STD-1553B bus. IC Role / Device Role / Timing Role: Hex DFF acting as synchronized input register - holds digitized samples stable during bus arbitration and framing cycles. Use Value: Prevents metastability-induced data corruption by ensuring all 6 bits latch simultaneously on a clean system clock edge under global enable control.	Use Scenario: Staging encrypted packet payloads in cryptographic modules prior to RF modulation in SATCOM terminals. IC Role / Device Role / Timing Role: Parallel data latch providing deterministic hold time between cipher engine output and serial transmitter input. Use Value: Guarantees setup/hold compliance for downstream shift registers, eliminating race conditions in high-speed encryption pipelines.
Flight Control Actuator Interface	Radiation-Hardened Telemetry Encoder
Use Scenario: Interfacing autopilot command signals to servo motor drivers in UAV flight controllers operating at altitude. IC Role / Device Role / Timing Role: Output register holding PWM duty-cycle commands until next control cycle update. Use Value: Provides glitch-free output transitions by preventing partial updates - all six actuator channels change state atomically on clock edge.	Use Scenario: Encoding housekeeping telemetry (voltage, current, temperature) into fixed-width frames for downlink in CubeSat missions. IC Role / Device Role / Timing Role: Synchronized data capture stage preceding Manchester encoder logic. Use Value: Ensures bit alignment integrity across telemetry words despite variable sensor readout timing, critical for Reed-Solomon decoding robustness.

Avionics Data Acquisition

Secure Communication Buffering

Use Scenario: Capturing sensor telemetry (e.g., pressure, temperature, attitude) from analog-to-digital converters before transmission via MIL-STD-1553B bus.

IC Role / Device Role / Timing Role: Hex DFF acting as synchronized input register - holds digitized samples stable during bus arbitration and framing cycles.

Use Value: Prevents metastability-induced data corruption by ensuring all 6 bits latch simultaneously on a clean system clock edge under global enable control.

Use Scenario: Staging encrypted packet payloads in cryptographic modules prior to RF modulation in SATCOM terminals.

IC Role / Device Role / Timing Role: Parallel data latch providing deterministic hold time between cipher engine output and serial transmitter input.

Use Value: Guarantees setup/hold compliance for downstream shift registers, eliminating race conditions in high-speed encryption pipelines.

Flight Control Actuator Interface

Radiation-Hardened Telemetry Encoder

Use Scenario: Interfacing autopilot command signals to servo motor drivers in UAV flight controllers operating at altitude.

IC Role / Device Role / Timing Role: Output register holding PWM duty-cycle commands until next control cycle update.

Use Value: Provides glitch-free output transitions by preventing partial updates - all six actuator channels change state atomically on clock edge.

Use Scenario: Encoding housekeeping telemetry (voltage, current, temperature) into fixed-width frames for downlink in CubeSat missions.

IC Role / Device Role / Timing Role: Synchronized data capture stage preceding Manchester encoder logic.

Use Value: Ensures bit alignment integrity across telemetry words despite variable sensor readout timing, critical for Reed-Solomon decoding robustness.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS378J	Same logic function and electrical specs, but in 16-pin CDIP package with through-hole leads.	Preferred for prototyping or board-level repair where socketing or manual rework is required.	Select SNJ54LS378J when mechanical serviceability or thermal mass tolerance outweighs hermeticity needs.
SN74LS378N	Commercial-grade version (0°C to +70°C), PDIP package, RoHS-compliant lead finish.	Restricted to ground-based industrial or lab equipment with controlled ambient conditions.	Choose SN74LS378N only for non-military, cost-sensitive applications where extended temperature range is unnecessary.

Compared with SNJ54LS378J and SN74LS378N, the SNJ54LS378W uniquely combines hermetic CFP packaging, full military temperature rating, and gold-plated terminations - making it the sole option qualified for sustained operation in vacuum, high-vibration, or extreme thermal gradient environments.

Availability

SNJ54LS378W is available at Aetrix Electronics and suitable for avionics subsystems, secure communications hardware, and radiation-tolerant telemetry systems requiring stable component supply across long production lifecycles and obsolescence-prone military programs.

Supply support for SNJ54LS378W 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, aerospace, and defense markets.

The SNJ54LS378W belongs to TI's military-grade 54LS logic family - engineered specifically for high-reliability digital control, data acquisition, and register storage in systems where environmental resilience and long-term component availability are mandatory.

FAQ

What is the maximum clock frequency supported by SNJ54LS378W?

The SNJ54LS378W supports reliable operation up to 25 MHz, based on its maximum 20 ns CLK-to-Q propagation delay and minimum 15 ns setup/hold timing requirements. At 5 V supply and –55°C to +125°C, derating may apply for worst-case timing closure; designers should verify margins using TI's SDLS167 datasheet timing diagrams. The SNJ54LS378W does not include internal PLLs or frequency multipliers - its speed is strictly limited by TTL gate delays.

Does SNJ54LS378W have asynchronous reset or preset functionality?

No, the SNJ54LS378W does not include asynchronous reset (CLR) or preset (PRE) inputs. It is a purely synchronous D-type flip-flop with enable - state changes occur only on the rising edge of CLK when G̅ is low. Any reset functionality must be implemented externally using the G̅ line or upstream logic. This design simplifies timing analysis but requires external circuitry for power-on initialization or fault recovery.

Can SNJ54LS378W be used as a drop-in replacement for SN74LS378 in commercial designs?

The SNJ54LS378W shares identical logic function, pinout, and DC/AC electrical specifications with SN74LS378, but is not a drop-in replacement due to its military temperature range (–55°C to +125°C) and CFP packaging. While electrically compatible, its higher cost, different thermal expansion profile, and hermetic sealing require PCB layout verification. For commercial applications, SN74LS378N or SN74LS378DR are preferred alternatives.

What is the meaning of "NRND" status for SNJ54LS378W?

"NRND" (Not Recommended for New Designs) indicates that Texas Instruments no longer promotes SNJ54LS378W for newly initiated projects, though it remains in production to support existing military and aerospace programs. Aetrix Electronics maintains active inventory and offers lifecycle management services for SNJ54LS378W, including last-time buy coordination and cross-reference guidance to qualified alternatives like SNJ54LS378J where appropriate.

How does the CFP-W package of SNJ54LS378W differ from CDIP or PDIP packages in practical design?

The CFP-W (Ceramic Flatpack) package of SNJ54LS378W features a hermetically sealed ceramic body, flat gull-wing leads, and gold-plated terminations - offering superior moisture resistance, thermal cycling endurance, and long-term reliability versus plastic PDIP or ceramic CDIP packages. Unlike CDIP, CFP-W lacks through-hole pins and requires surface-mount reflow; unlike PDIP, it eliminates plastic outgassing risks in vacuum. Layout must accommodate tighter pitch (0.050″) and planarity control.

SNJ54LS378W 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:: -

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Mounting Type:: -

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SNJ54LS378W FAQ

1.How can I place an order for SNJ54LS378W through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54LS378W 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 SNJ54LS378W reliable?

The price and inventory of SNJ54LS378W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS378W is usually 5 days.

3.What payment methods are accepted for SNJ54LS378W?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54LS378W transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54LS378W?

SNJ54LS378W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54LS378W 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 SNJ54LS378W?

For technical support, including SNJ54LS378W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS378W requirements.

6.How does Aetrix verify that SNJ54LS378W is sourced from the original manufacturer or authorized distributors?

All SNJ54LS378W 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 SNJ54LS378W meets industry standards.

7.What is the process for return or replacement of SNJ54LS378W?

All SNJ54LS378W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS378W, 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 SNJ54LS378W part is unused and in its original packaging.

Return procedure for SNJ54LS378W:

1.Submit a request within 90 days.

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

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