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Texas Instruments SNJ54LS368AJ
- Part No.:
- SNJ54LS368AJ
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SNJ54LS368AJ.pdf
- Description:
- 54LS368A HEX BUS DRIVERS WITH 3-
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Product details
Overview
SNJ54LS368AJ from Texas Instruments is a military-grade octal buffer/line driver with three-state outputs, designed for high-reliability logic interfacing in aerospace and defense systems. It features dual 4-bit non-inverting buffers, TTL-compatible inputs, ±20 mA output drive capability, and operates across -55°C to +125°C. It is used in avionics data bus drivers and radiation-tolerant control modules.
For engineers reviewing the SNJ54LS368AJ datasheet, SNJ54LS368AJ pinout, SNJ54LS368AJ application, or SNJ54LS368AJ equivalent, key selection criteria include its military temperature range (-55°C to +125°C), CDIP (J) 16-pin hermetic package, three-state enable control per group, guaranteed fan-out of 20 LS-TTL loads, and compatibility with legacy 54LS logic families in harsh-environment digital subsystems.
Technical Context
The SNJ54LS368AJ implements two independent 4-bit non-inverting buffer sections, each with separate active-low output-enable (OE1̅, OE2̅) controls. Its bipolar TTL circuitry ensures deterministic propagation delay (max 25 ns at VCC = 5V), noise immunity via hysteresis-free input thresholds, and robust DC output characteristics (VOH ≥ 2.7V, VOL ≤ 0.5V at IOL = 20 mA).
It adheres to MIL-STD-883 Class B requirements and is qualified under QML-38535 for high-reliability applications. The device requires no external pull-ups or level-shifting when interfacing with standard 54/74LS logic, and its output disable leakage current (IOZ ≤ 20 µA) supports low-power bus hold during tri-state operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 54LS TTL - ensures direct compatibility with legacy military-grade 54-series logic without level translation. |
| Operating Temperature | -55°C to +125°C - certified for extended-range operation in airborne, space, and ground vehicle control systems. |
| Supply Voltage | 4.5V to 5.5V - supports stable performance under regulated 5V rails with ±10% tolerance, typical in avionics power domains. |
| Output Drive | ±20 mA - sufficient to directly drive 20 LS-TTL inputs or terminate unterminated transmission lines up to 15 cm. |
| Propagation Delay | 25 ns max (tPLH/tPHL) - enables reliable timing in synchronous bus interfaces operating up to 20 MHz. |
| Input Compatibility | LS-TTL and standard TTL - accepts VIH ≥ 2.0V and VIL ≤ 0.8V, eliminating need for input conditioning in mixed-logic systems. |
| Three-State Enable | Active-low OE1̅/OE2̅ - allows independent disabling of each 4-bit group to prevent bus contention in multiplexed data paths. |
Pinout & Package
SNJ54LS368AJ is supplied in a hermetically sealed Ceramic Dual-In-Line Package (CDIP), designated J package, with 16 leads and 0.3-inch body width. The package meets MIL-PRF-38535 requirements for moisture resistance and thermal cycling reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Group 1 Inputs (A1–A4) | Non-inverting data inputs for first 4-bit buffer section; accept standard TTL logic levels. |
| 5 | OE1̅ | Active-low output enable for Group 1; drives all four outputs into high-impedance state when HIGH. |
| 6, 7, 8, 9 | Group 1 Outputs (Y1–Y4) | Buffered non-inverting outputs; each capable of sourcing/sinking 20 mA in active state. |
| 10, 11, 12, 13 | Group 2 Inputs (B1–B4) | Non-inverting data inputs for second 4-bit buffer section; electrically isolated from Group 1. |
| 14 | OE2̅ | Active-low output enable for Group 2; independent control allows staggered bus arbitration. |
| 15, 16 | VCC / GND | Power supply (Pin 16) and ground (Pin 8) - note: Pin 8 is GND, not output; correct pin mapping per TI CDIP-16 outline. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit buffers | Enables simultaneous or selective routing of two 4-bit data streams without internal crosstalk or shared control timing. |
| MIL-STD-883 qualified | Guarantees performance under mechanical shock (500 g), vibration (10–2000 Hz), and temperature cycling (−55°C ↔ +125°C, 100 cycles). |
| Hermetic CDIP (J) package | Provides zero moisture ingress and long-term stability in high-humidity or vacuum environments, critical for satellite payload electronics. |
| High-output current (±20 mA) | Eliminates need for external bus transceivers when driving multiple LS-TTL loads or capacitive PCB traces up to 50 pF. |
| Low standby current (ICC = 34 mA max) | Supports predictable power budgeting in always-on mission-critical subsystems where thermal management is constrained. |
Applications
| Avionics Data Bus Interface | Ground Vehicle Control Module |
|---|---|
Use Scenario: Isolating and buffering ARINC 429 or MIL-STD-1553B subsystem data lines between flight computers and sensor I/O units. IC Role / Device Role / Timing Role: Non-inverting line driver with controlled enable timing to prevent metastability during bus arbitration transitions. Use Value: Guaranteed 25 ns propagation delay and -55°C to +125°C operation ensure deterministic timing margins in real-time flight control loops. | Use Scenario: Driving discrete actuator command signals (e.g., solenoid valves, motor starters) from a ruggedized vehicle controller. IC Role / Device Role / Timing Role: High-current buffer translating microcontroller GPIO outputs to industrial-level load switching signals. Use Value: ±20 mA drive capability directly activates 24V relay coils or optocoupler inputs without external transistor stages. |
| Satellite Payload Command Decoder | Tactical Radio Baseband Interface |
Use Scenario: Decoding and distributing telemetry command words from a radiation-hardened processor to multiple payload subsystems. IC Role / Device Role / Timing Role: Three-state-enabled signal distributor enabling time-multiplexed access to shared command buses. Use Value: OE1̅/OE2̅ independence allows sequential activation of payload groups, reducing peak current draw and EMI emissions. | Use Scenario: Level-shifting and buffering baseband I/Q data paths between FPGA-based modulators and analog front-end DACs. IC Role / Device Role / Timing Role: Low-skew, non-inverting repeater preserving signal integrity across 10+ cm PCB traces in RF-dense enclosures. Use Value: Matched tPLH/tPHL (≤25 ns) minimizes differential skew between I and Q channels, maintaining <0.5° phase error at 10 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54LS367AJ | Inverting outputs (vs. non-inverting in SNJ54LS368AJ); identical pinout, temp range, and drive strength. | Required where logic polarity inversion is needed in bus direction control or complement generation. | Select SNJ54LS367AJ only if system-level logic equations require inverted outputs; otherwise, SNJ54LS368AJ avoids additional inverters. |
| SN54LS368AJ | Same functionality and pinout, but commercial-grade marking (non-QML); identical CDIP (J) package and -55°C to +125°C rating. | Approved for non-military programs where QML-38535 certification is not mandated. | Choose SN54LS368AJ for cost-sensitive defense-adjacent applications with equivalent environmental needs but relaxed qualification requirements. |
Compared with SNJ54LS367AJ, SNJ54LS368AJ provides non-inverting signal path integrity essential for transparent data forwarding; compared with SN54LS368AJ, it adds full QML-38535 traceability and lot-level MIL-STD-883 test reports required for DoD prime contracts.
Availability
SNJ54LS368AJ is available at Aetrix Electronics and suitable for avionics data bus interface, ground vehicle control module, satellite payload command decoder, and tactical radio baseband interface requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54LS368AJ 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 global semiconductor leader specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.
The SNJ54LS368AJ belongs to TI's military 54LS logic family, engineered specifically for high-integrity digital interfacing in mission-critical systems where environmental resilience and long-term supply assurance are mandatory.
FAQ
What is the maximum propagation delay specification for SNJ54LS368AJ?
The maximum propagation delay (tPLH and tPHL) for SNJ54LS368AJ is 25 ns under standard test conditions (VCC = 5V, TA = -55°C to +125°C, CL = 15 pF). This value is measured from the 50% point of the input transition to the 50% point of the output transition and is guaranteed across the full military temperature range. SNJ54LS368AJ maintains this timing consistency without derating, making it suitable for synchronous bus designs up to 20 MHz.
Does SNJ54LS368AJ support hot-swap or live-insertion?
SNJ54LS368AJ does not include built-in hot-swap protection features such as power-up sequencing control, slew-rate limiting, or back-drive immunity. Its bipolar TTL inputs and outputs are susceptible to latch-up if powered sequencing is violated or if outputs are driven while VCC is absent. Therefore, SNJ54LS368AJ must be inserted only into de-energized systems or used with external protection circuitry. For hot-swap applications, consider dedicated hot-swap controllers paired with SNJ54LS368AJ.
What is the meaning of the 'J' in SNJ54LS368AJ's package designation?
The 'J' in SNJ54LS368AJ denotes the Ceramic Dual-In-Line Package (CDIP) variant per JEDEC MS-012, featuring a 0.3-inch body width, 16 leads, and hermetic ceramic construction. This package type provides superior thermal conductivity, zero moisture permeability, and mechanical rigidity-critical for high-reliability applications in aerospace and defense. The 'J' suffix distinguishes it from plastic DIP (N), SOIC (D), or SOP (NS) variants of functionally similar devices.
Can SNJ54LS368AJ be used interchangeably with SN74LS368AN in commercial designs?
No, SNJ54LS368AJ and SN74LS368AN are not interchangeable without design validation. While both share identical logic functionality and pinout, SNJ54LS368AJ is QML-38535 qualified for military use (-55°C to +125°C, MIL-STD-883 tested), whereas SN74LS368AN is commercial-grade (0°C to +70°C, no MIL testing). Substituting SNJ54LS368AJ into a commercial design incurs unnecessary cost and qualification overhead; substituting SN74LS368AN into a military design violates temperature and reliability requirements. SNJ54LS368AJ remains the only valid choice for applications requiring extended temperature operation and MIL certification.
What are the recommended soldering profiles for SNJ54LS368AJ's CDIP (J) package?
SNJ54LS368AJ's CDIP (J) package has no moisture sensitivity level (MSL) rating and is exempt from reflow profile constraints due to its hermetic ceramic construction. TI specifies "N/A for Pkg Type" for MSL and peak reflow. Standard tin-lead (SnPb) wave or hand-soldering at 260°C for ≤10 seconds is acceptable. For Pb-free assembly, peak temperatures up to 260°C for 20 seconds are permitted. Pre-baking is unnecessary. Always verify joint integrity using IPC-A-610 Class 3 criteria for high-reliability assemblies.
SNJ54LS368AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SNJ54LS368AJ FAQ
1.How can I place an order for SNJ54LS368AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LS368AJ 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 SNJ54LS368AJ reliable?
The price and inventory of SNJ54LS368AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS368AJ is usually 5 days.
3.What payment methods are accepted for SNJ54LS368AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54LS368AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54LS368AJ?
SNJ54LS368AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LS368AJ 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 SNJ54LS368AJ?
For technical support, including SNJ54LS368AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS368AJ requirements.
6.How does Aetrix verify that SNJ54LS368AJ is sourced from the original manufacturer or authorized distributors?
All SNJ54LS368AJ 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 SNJ54LS368AJ meets industry standards.
7.What is the process for return or replacement of SNJ54LS368AJ?
All SNJ54LS368AJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS368AJ, 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 SNJ54LS368AJ part is unused and in its original packaging.
Return procedure for SNJ54LS368AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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