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Texas Instruments SN54LS378J
- Part No.:
- SN54LS378J
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
SN54LS378J.pdf
- Description:
- 54LS378 HEX D-TYPE FLIP-FLOPS WI
- Quantity:
- Payment:
- Shipping:
Inventory:669
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Product details
Overview
SN54LS378J from Texas Instruments is a hex D-type flip-flop with common clock enable, implemented in bipolar TTL technology, operating over –55°C to +125°C, with 16-pin CDIP package, 15 ns typical propagation delay, and 20 mA output drive capability. It functions as a synchronous data latch in military-grade digital control and timing circuits.
For engineers reviewing the SN54LS378J datasheet, SN54LS378J pinout, SN54LS378J application, or SN54LS378J equivalent, key selection considerations include its military temperature range, TTL-compatible input thresholds, enable-controlled edge-triggered operation, and compatibility with legacy 5-V logic systems requiring high-reliability storage elements.
Technical Context
The SN54LS378J implements six independent D-type latches sharing a single active-high clock enable (CE) and a common clock (CLK). Each stage samples the D input on the rising edge of CLK only when CE is high; otherwise, outputs retain state. Its TTL input structure ensures compatibility with standard LS/TTL logic families and robust noise immunity.
Designed for military applications, it uses silicon-gate bipolar process technology to meet MIL-PRF-38535 Class B requirements. The device features complementary Q and Q̅ outputs per stage, no internal reset/set, and operates strictly from a 5-V ±5% supply - with guaranteed performance across full temperature range without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL: ensures interoperability with 74LS-series logic and defined voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max). |
| Operating Temperature | –55°C to +125°C: qualified per MIL-PRF-38535 for deployment in avionics, ground vehicle, and space-qualified electronics. |
| Propagation Delay | 15 ns max (tPLH/tPHL at VCC = 5 V, TA = 25°C): enables reliable operation in 33-MHz synchronous systems with margin. |
| Output Drive | 20 mA sink / 0.4 mA source: sufficient to directly drive multiple TTL inputs or small LED indicators without buffering. |
| Supply Voltage | 5 V ±5%: requires tightly regulated 5-V rail; not tolerant of wider voltage excursions or mixed-supply environments. |
| Package Type | 16-pin Ceramic Dual In-line Package (CDIP, drawing J): hermetically sealed, lead-tin finish, MSL N/A, suitable for high-reliability board assembly. |
Pinout & Package
SN54LS378J is housed in a 16-pin Ceramic Dual In-line Package (CDIP-J), 0.300-inch wide body, with 0.100-inch lead pitch and through-hole mounting. The package provides hermetic sealing and thermal stability for extended operation in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 7, 8 | D₀–D₅ Inputs | Asynchronous data inputs for each of six D-type flip-flop stages; TTL-compatible voltage thresholds apply. |
| 3, 6, 9, 12, 14, 15 | Q₀–Q₅ Outputs | True outputs for each stage; capable of driving up to 20 mA sink load while maintaining VOH ≥ 2.4 V. |
| 10 | CLK | Rising-edge-triggered clock input; all six stages sample D inputs simultaneously on CLK high-to-low transition if CE is asserted. |
| 11 | CE | Active-high clock enable; when low, CLK edges are ignored and outputs hold prior state regardless of D input changes. |
| 16 | VCC | Positive supply terminal: must be connected to 5 V ±5%; decoupling capacitor required near pin. |
| 8 | GND | Ground reference for all logic and power; shared return path for all six output stages. |
Key Features
| Feature | Design Value |
|---|---|
| Hex D-type flip-flop architecture | Six independent, edge-triggered storage elements in one IC - reduces board space vs. discrete 74LS74 usage. |
| Common clock enable control | Single CE line gates clocking for all six stages - simplifies synchronization in multi-channel data capture systems. |
| Military-grade qualification | Meets MIL-PRF-38535 Class B screening including burn-in, temperature cycling, and lot acceptance testing. |
| Complementary outputs per stage | Each stage provides both Q and Q̅ outputs - eliminates need for external inverters in toggle or feedback configurations. |
Applications
| Industrial Control Logic | Aerospace Data Acquisition |
|---|---|
Use Scenario: Latching sensor status bits (e.g., pressure, temperature, valve position) in programmable logic controllers before scan cycle readout. IC Role / Device Role / Timing Role: Synchronous data register holding parallel status inputs aligned to system clock edge under enable control. Use Value: Ensures deterministic sampling window and eliminates metastability risk during PLC I/O update cycles. | Use Scenario: Capturing telemetry words from analog-to-digital converters in satellite payload subsystems prior to packetization. IC Role / Device Role / Timing Role: Hex register staging raw ADC output bits for downstream processing; CE synchronized to frame sync signal. Use Value: Provides radiation-tolerant, temperature-stable storage with verified timing margins across mission-critical thermal profiles. |
| Test Equipment Pattern Generation | Military Communication Interface |
Use Scenario: Holding test vector bits in automated test equipment (ATE) pattern generators before applying to device-under-test pins. IC Role / Device Role / Timing Role: Output register controlling parallel stimulus lines; CE used to freeze pattern during setup/hold verification. Use Value: Enables precise timing control of stimulus application with sub-20 ns resolution and repeatable edge alignment. | Use Scenario: Buffering command bits between microcontroller and MIL-STD-1553 bus controller interface logic. IC Role / Device Role / Timing Role: Command latch isolating processor writes from bus arbitration timing; CE tied to bus grant signal. Use Value: Prevents spurious command execution during bus contention and guarantees atomic write completion under interrupt latency. |
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 | Identical electrical and mechanical specification; same CDIP-16 package, –55°C to +125°C rating, and MIL-PRF-38535 Class B compliance. | No functional or application difference; SNJ54LS378J is an alternate orderable number for the same device per TI documentation. | Select SNJ54LS378J only if procurement system requires that specific manufacturer part number; otherwise, SN54LS378J is fully interchangeable. |
| SN74LS378N | Commercial version: PDIP-16 package, 0°C to +70°C operating range, no MIL screening; identical logic function, timing, and pinout. | Limited to benign-environment applications such as lab equipment or non-critical industrial controls where extended temperature and reliability are not required. | Choose SN74LS378N for cost-sensitive, non-military designs where full temperature range and screening are unnecessary. |
Compared with SN54LS378J, SNJ54LS378J offers identical performance and qualification but differs only in ordering nomenclature, while SN74LS378N provides the same logic functionality at lower cost and reliability for commercial use - making SN54LS378J the sole choice for deployed military hardware requiring full environmental and screening compliance.
Availability
SN54LS378J is available at Aetrix Electronics and suitable for aerospace avionics, defense electronics, and ruggedized industrial control systems requiring stable component supply across extended lifecycle commitments.
Supply support for SN54LS378J 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, and defense markets.
The SN54LS378J belongs to TI's military-grade TTL logic family designed specifically for high-integrity digital systems where deterministic timing, wide temperature operation, and long-term supply assurance are mandatory.
FAQ
What is the maximum clock frequency supported by SN54LS378J?
The SN54LS378J does not specify a maximum clock frequency in its datasheet; instead, it guarantees a maximum propagation delay of 15 ns (tPLH/tPHL) and minimum pulse width of 20 ns for CLK and CE. Designers derive usable frequency limits from these timing parameters - typically up to 33 MHz in well-designed layouts with controlled trace lengths and proper decoupling.
Does SN54LS378J include asynchronous reset or preset functionality?
No, SN54LS378J does not provide asynchronous reset (CLR) or preset (PRE) inputs. It is a pure edge-triggered D-type flip-flop with only clock (CLK), clock enable (CE), data (D₀–D₅), and outputs (Q₀–Q₅). Any reset functionality must be implemented externally using combinational logic or upstream control signals.
Can SN54LS378J be used with modern 3.3-V systems?
SN54LS378J is strictly a 5-V TTL device and is not 3.3-V compatible. Its input thresholds (VIH = 2.0 V min) may accept 3.3-V logic highs, but its outputs swing to ~3.4 V (VOH) under load - insufficient to reliably drive 3.3-V CMOS inputs. Level-shifting circuitry or a 5-V system domain is required for integration.
What is the meaning of the 'J' suffix in SN54LS378J?
The 'J' suffix in SN54LS378J denotes the Ceramic Dual In-line Package (CDIP) with 16 leads and standard JEDEC outline drawing J. This package type is hermetically sealed, rated for military temperature range, and features tin-lead solderable leads - distinguishing it from plastic (N), SOIC (D), or CFP (W) variants.
Is SN54LS378J RoHS compliant?
SN54LS378J is not RoHS compliant. As a legacy military-grade CDIP device, it uses leaded solder finish and is exempt from RoHS restrictions under EU Directive 2011/65/EU Annex III for high-reliability applications. TI documentation confirms "TBD" for Eco Plan and "Call TI" for lead finish - indicating non-RoHS-conforming materials.
SN54LS378J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54LS
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Clock Frequency:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 27ns @ 5V, 15pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 400µA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 22 mA
- Input Capacitance:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
SN54LS378J FAQ
1.How can I place an order for SN54LS378J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54LS378J 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 SN54LS378J reliable?
The price and inventory of SN54LS378J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54LS378J is usually 5 days.
3.What payment methods are accepted for SN54LS378J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54LS378J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54LS378J?
SN54LS378J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54LS378J 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 SN54LS378J?
For technical support, including SN54LS378J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54LS378J requirements.
6.How does Aetrix verify that SN54LS378J is sourced from the original manufacturer or authorized distributors?
All SN54LS378J 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 SN54LS378J meets industry standards.
7.What is the process for return or replacement of SN54LS378J?
All SN54LS378J units undergo pre-shipment inspection (PSI). If there is an issue with SN54LS378J, 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 SN54LS378J part is unused and in its original packaging.
Return procedure for SN54LS378J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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