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Texas Instruments SNJ54ABT240FK
- Part No.:
- SNJ54ABT240FK
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SNJ54ABT240FK.pdf
- Description:
- 54ABT240 OCTAL BUFFERS/DRIVERS W
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Inventory:485
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Product details
Overview
SNJ54ABT240FK from Texas Instruments is a military-grade octal inverting buffer/driver with 3-state outputs, designed for high-density bus interfacing in aerospace and defense systems. It features dual 4-bit sections with independent active-low output-enable (OE) inputs, –32-mA IOH / 64-mA IOL drive strength, Ioff partial-power-down support, and operates across –55°C to 125°C.
For engineers reviewing the SNJ54ABT240FK datasheet, SNJ54ABT240FK pinout, SNJ54ABT240FK application, or SNJ54ABT240FK equivalent, this device serves as a high-drive, latch-up-resistant logic interface for memory address buffering, clock distribution, and bidirectional bus driving under extended temperature and reliability requirements.
Technical Context
The SNJ54ABT240FK implements two independent 4-bit inverting buffer sections, each with separate OE control. Its ABT logic family delivers TTL-compatible input thresholds and CMOS-level output swing, enabling mixed-voltage system interfacing while maintaining noise immunity.
It supports true partial-power-down operation via Ioff circuitry that disables outputs when VCC = 0 V, preventing backflow current. Latch-up performance exceeds 500 mA per JEDEC JESD17, and ESD protection meets 2000-V HBM and 200-V MM standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage (VCC) | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems and tolerance to rail droop. |
| Output drive (IOL / IOH) | 64 mA sink / –32 mA source - enables direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| Propagation delay (tPLH/tPHL) | 1 ns to 4.6 ns at VCC = 5 V - supports high-speed bus timing in real-time avionics and test equipment. |
| Ioff current | ±100 µA at VCC = 0 - guarantees safe hot-insertion and power sequencing in modular chassis systems. |
| Operating temperature | –55°C to 125°C - qualified for MIL-PRF-38535 Class B applications including spaceflight and airborne electronics. |
| Input clamp current (IIK) | –18 mA - protects against negative transients during ESD events or signal undershoot. |
| Package thermal resistance (θJA) | Not specified for FK package - LCCC construction provides low-inductance, hermetic sealing suitable for high-reliability environments. |
Pinout & Package
LCCC (Leadless Ceramic Chip Carrier), 20-pin, hermetically sealed, 8.89 mm × 8.89 mm body, 1.27 mm pitch, 2.03 mm max height. Designed for high-reliability mounting on ceramic substrates or metal-core PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable | Independent control of each 4-bit section; pull high via resistor during power-up to ensure high-impedance state. |
| 1A1–1A4, 2A1–2A4 | Inverting data inputs | Accept TTL/CMOS logic levels; inverted data passed to corresponding Y outputs when OE is low. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state outputs | Drive bus lines with high sink/source capability; enter high-Z when OE is high or VCC = 0. |
| VCC, GND | Power supply terminals | Dual dedicated power and ground pins per side reduce switching noise and improve decoupling effectiveness. |
Key Features
| Feature | Design Value |
|---|---|
| High-drive outputs | –32-mA IOH and 64-mA IOL enable direct fanout to ≥10 standard TTL loads or long trace routing without signal degradation. |
| Ioff partial-power-down | Prevents damaging current flow when VCC is off, allowing safe insertion into live backplanes or hot-swap modules. |
| MIL-PRF-38535 qualification | Class B screening includes temperature cycling, burn-in, and lot acceptance testing-ensuring suitability for mission-critical hardware. |
| Low ground bounce (VOLP) | <1 V at VCC = 5 V - minimizes noise coupling into adjacent analog or RF circuits in mixed-signal platforms. |
| ESD robustness | 2000-V HBM and 200-V MM ratings exceed MIL-STD-883 requirements, reducing field failure risk in handling and deployment. |
Applications
| Avionics Data Bus Interface | Spacecraft Onboard Computer I/O |
|---|---|
Use Scenario: Isolating and buffering address/data lines between radiation-hardened microprocessors and memory modules in flight computers. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level-shifted, high-current drive for 16-bit parallel buses with precise OE-controlled timing windows. Use Value: Enables deterministic bus arbitration and eliminates contention during processor reset sequences using independent OE control per 4-bit segment. |
Use Scenario: Driving clock and control signals to multiple FPGA configuration interfaces in satellite payload controllers. IC Role / Device Role / Timing Role: High-speed clock driver with matched propagation delays across all eight outputs to maintain skew-critical timing alignment. Use Value: Delivers sub-5 ns tPLH/tPHL variation across channels, ensuring synchronous bitstream loading across distributed reconfigurable logic units. |
| Tactical Radio Baseband Processing | Ground Test Equipment Signal Conditioning |
Use Scenario: Interfacing digital baseband ASICs with analog front-end components in secure HF/VHF radios operating in extreme environmental conditions. IC Role / Device Role / Timing Role: Bidirectional bus transceiver buffer supporting both transmit path data latching and receive path status reporting. Use Value: Ioff functionality allows safe power cycling of baseband ICs while preserving bus integrity and preventing signal corruption during mode transitions. |
Use Scenario: Signal conditioning and level translation in automated test equipment (ATE) fixtures used for functional validation of legacy military electronics. IC Role / Device Role / Timing Role: Logic-level translator and fanout amplifier for generating synchronized stimulus patterns across multiple DUT channels. Use Value: 64-mA IOL drive ensures clean edge integrity into 50-Ω coaxial cabling and high-capacitance probe loads, improving test repeatability and margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ABT244FK | Noninverting output logic (vs. inverting in SNJ54ABT240FK); otherwise identical electrical specs and packaging. | Suitable where signal polarity must be preserved across the buffer stage, e.g., in feedback paths or diagnostic monitoring loops. | Select SNJ54ABT244FK only when inverting behavior would disrupt system-level logic flow or timing analysis. |
| SNJ54ACT240FK | AC logic family: lower drive (–24 mA / 24 mA), higher speed (tPD ≈ 3.5 ns), no Ioff support, same temperature range. | Better suited for low-power, high-frequency clock distribution where bus contention risk is mitigated by system architecture. | Choose SNJ54ACT240FK when power efficiency and minimal propagation delay outweigh the need for Ioff and high-current drive. |
Compared with SNJ54ABT240FK, SNJ54ABT244FK preserves signal polarity but offers identical drive and reliability, while SNJ54ACT240FK trades Ioff and output strength for faster switching and lower static current-making it appropriate only in non-hot-swap, low-load scenarios.
Availability
SNJ54ABT240FK is available at Aetrix Electronics and suitable for avionics data bus interface, spacecraft onboard computer I/O, and tactical radio baseband processing requiring stable component supply under extended temperature and high-reliability constraints.
Supply support for SNJ54ABT240FK 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 with over 90 years of innovation in analog, embedded processing, and high-reliability logic solutions.
The SNJ54ABT240FK belongs to TI's military ABT logic family, engineered specifically for demanding aerospace, defense, and industrial control applications requiring extended temperature operation, latch-up immunity, and robust ESD performance.
FAQ
What is the operating temperature range of the SNJ54ABT240FK?
The SNJ54ABT240FK is rated for –55°C to 125°C operation and is fully qualified to MIL-PRF-38535 Class B standards. This range supports deployment in jet engine bays, satellite orbital environments, and desert-deployed electronic warfare systems where ambient extremes challenge commercial-grade logic devices. All electrical parameters in the SNJ54ABT240FK datasheet are guaranteed across this full range.
Does the SNJ54ABT240FK support partial-power-down operation?
Yes, the SNJ54ABT240FK includes Ioff circuitry that actively disables outputs when VCC = 0 V, limiting Ioff to ±100 µA. This feature prevents damaging backflow current during hot-swap events or staged power sequencing in modular avionics racks. The SNJ54ABT240FK maintains this behavior across its full temperature range without external biasing.
What is the pinout configuration of the SNJ54ABT240FK package?
The SNJ54ABT240FK uses a 20-pin LCCC (FK) package with dual-row, square-outline layout. Pin 1 is located at the top-left corner (marked by index area), followed clockwise: 1OE, 1A1, 2Y4, 1A2, 2Y3, 1A3, 2Y2, 1A4, 2Y1, GND, VCC, 2OE, 1Y1, 2A4, 1Y2, 2A3, 1Y3, 2A2, 1Y4, 2A1. Full mechanical drawings are available in TI's FK package outline document.
How does the SNJ54ABT240FK differ from the commercial SN74ABT240A?
The SNJ54ABT240FK differs from the SN74ABT240A in three key ways: it is screened to MIL-PRF-38535 Class B (including burn-in and lot acceptance testing), rated for –55°C to 125°C (vs. –40°C to 85°C), and packaged in hermetic LCCC (FK) instead of plastic SOIC/DW or SSOP/DB. Electrical specs are otherwise identical, but SNJ54ABT240FK guarantees performance under military environmental stress profiles.
Can the SNJ54ABT240FK be used as a direct replacement for SNJ54LS240 in legacy designs?
No-the SNJ54ABT240FK is not a direct replacement for SNJ54LS240 due to fundamental differences in logic family characteristics: ABT offers significantly higher drive (64 mA vs. 8 mA), faster propagation (≤4.6 ns vs. ≤15 ns), and different input thresholds (VIH = 2 V vs. VIH = 2.0 V but with higher input current). Board-level redesign-including decoupling, termination, and timing analysis-is required before substitution.
SNJ54ABT240FK 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:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SNJ54ABT240FK FAQ
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6.How does Aetrix verify that SNJ54ABT240FK is sourced from the original manufacturer or authorized distributors?
All SNJ54ABT240FK 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 SNJ54ABT240FK meets industry standards.
7.What is the process for return or replacement of SNJ54ABT240FK?
All SNJ54ABT240FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ABT240FK, 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 SNJ54ABT240FK part is unused and in its original packaging.
Return procedure for SNJ54ABT240FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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