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Texas Instruments SNJ54AS240AJ
- Part No.:
- SNJ54AS240AJ
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54AS240AJ.pdf
- Description:
- 54AS240A OCTAL BUFFERS/DRIVERS W
- Quantity:
- Payment:
- Shipping:
Inventory:2,929
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Product details
Overview
SNJ54AS240AJ from Texas Instruments is a military-grade octal buffer/driver with 3-state outputs, designed for memory address driving and bus interfacing in high-reliability systems. It features dual independent 4-bit noninverting buffers, symmetrical active-low output-enable (OE) inputs, 64 mA low-level output drive (IOL), 1.2 ns typical propagation delay (tPLH), and operates across –55°C to +125°C.
For engineers reviewing the SNJ54AS240AJ datasheet, SNJ54AS240AJ pinout, SNJ54AS240AJ application, or SNJ54AS240AJ equivalent, this device is selected for high-speed, radiation-tolerant bus buffering in aerospace avionics, defense computing, and secure embedded control where guaranteed 3-state isolation and MIL-PRF-38535 compliance are required.
Technical Context
The SNJ54AS240AJ implements two independent 4-bit noninverting buffer sections, each controlled by its own active-low OE input (1OE and 2OE). Its TTL-compatible inputs include pnp-based circuitry to reduce dc loading on upstream drivers. All outputs are fully 3-state capable with high-impedance disable states verified under VCC = 4.5–5.5 V and VO = 0.4 V or 2.7 V.
Switching performance is characterized at CL = 50 pF with R1 = R2 = 500 Ω, delivering tPLH/tPHL ≤ 7 ns and enable/disable times (tPZH/tPLZ) ≤ 9.5 ns. Electrical behavior is validated across the full –55°C to +125°C operating range per MIL-PRF-38535 requirements, with all parameters tested unless otherwise noted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal noninverting buffer with dual 3-state control (1OE/2OE) |
| Supply Voltage (VCC) | 4.5 V to 5.5 V - supports standard 5 V TTL rail with ±10% tolerance |
| Low-Level Output Current (IOL) | 64 mA - drives heavy capacitive loads or multiple TTL inputs without external buffering |
| Propagation Delay (tPLH) | 1 ns min / 7 ns max - enables sub-100 MHz bus operation with tight timing margins |
| 3-State Leakage (IOZL/IOZH) | ±50 µA - ensures robust high-impedance isolation during bus contention or power sequencing |
| Operating Temperature | –55°C to +125°C - qualified per MIL-PRF-38535 for extended environmental survivability |
| Input Threshold (VIL/VIL) | VIL = 0.4 V max, VIH = 2.0 V min - compatible with standard TTL logic families |
Pinout & Package
SNJ54AS240AJ is housed in a 20-pin Ceramic Dual-In-Line Package (CDIP-J), hermetically sealed for military reliability and moisture resistance. The package has 0.3-inch body width, 0.1-inch lead pitch, and meets MIL-STD-883 mechanical and thermal specifications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of first/second 4-bit buffer groups; low = enabled, high = high-Z |
| 1A1–1A4, 2A1–2A4 | Buffer inputs | Eight TTL-compatible data inputs grouped into two sets of four |
| 1Y1–1Y4, 2Y1–2Y4 | Buffer outputs | Eight noninverting 3-state outputs, each electrically isolated when OE is high |
| VCC | Power supply | +5 V supply pin (Pin 10); must be decoupled locally for noise immunity |
| GND | Ground reference | Signal and power return (Pin 20); critical for stable 3-state transition integrity |
Key Features
| Feature | Design Value |
|---|---|
| 64 mA IOL drive capability | Supports direct connection to 20+ standard TTL loads or long PCB traces without fanout buffers |
| Sub-10 ns switching performance | Enables reliable operation on 50–100 MHz system buses with margin for setup/hold timing |
| MIL-PRF-38535 qualification | Full screening including temperature cycling, burn-in, and parametric testing for defense/aerospace use |
| pnp input structure | Reduces input current draw to ≤1 mA, minimizing loading on clock or address drivers |
| Dual independent OE controls | Allows selective enabling of upper/lower nibbles for partial bus access or interleaved addressing |
Applications
| Aerospace Avionics Data Bus | Secure Military Computing |
|---|---|
Use Scenario: Buffering address/data lines between FPGA and radiation-hardened SRAM in satellite command modules. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating memory subsystems during DMA transfers and providing noise-immune signal integrity. Use Value: 64 mA drive and <7 ns propagation delay ensure reliable 80 MHz burst reads with deterministic timing across temperature extremes. |
Use Scenario: Driving shared control bus among encrypted crypto processors in tactical radios. IC Role / Device Role / Timing Role: Octal bus driver with independent OE pins enabling time-multiplexed access to common peripherals. Use Value: Dual OE control allows precise arbitration without external logic, reducing BOM count and board area. |
| Tactical Vehicle Control Systems | Hardened Industrial PLC Backplane |
Use Scenario: Interfacing microcontroller GPIO to ruggedized CAN transceiver arrays and sensor multiplexers. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for 5 V TTL signals in EMI-prone engine bay environments. Use Value: –55°C to +125°C operation and 50 µA 3-state leakage prevent bus lockup during thermal shock or voltage sag. |
Use Scenario: Address decoding and data latching in modular I/O chassis with hot-swap backplanes. IC Role / Device Role / Timing Role: Memory address register driver ensuring glitch-free enable/disable transitions during module insertion/removal. Use Value: Guaranteed 3-state isolation and MIL-spec packaging eliminate backplane contention faults during live reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ALS240AJ | Lower drive strength: IOL = 24 mA (standard) or 48 mA (–1 version); slower tPLH up to 22 ns | Better suited for lower-speed legacy systems where fanout >10 is not required | Select when cost or power efficiency outweighs speed and drive needs |
| SN74AS240AN | Commercial temperature range (0°C to 70°C); same electrical specs but non-military screening | Applicable only in non-critical industrial or test equipment with benign environments | Choose for cost-sensitive prototyping or commercial-grade subsystems without MIL-STD requirements |
Compared with SNJ54AS240AJ, SNJ54ALS240AJ trades speed and drive for lower power and legacy compatibility, while SN74AS240AN offers identical performance at lower cost but lacks extended temperature validation and MIL-PRF-38535 traceability-critical for flight-critical or field-deployed hardware.
Availability
SNJ54AS240AJ is available at Aetrix Electronics and suitable for aerospace avionics, defense computing, and hardened industrial PLC applications requiring stable component supply, long-term obsolescence management, and certified MIL-PRF-38535 traceability.
Supply support for SNJ54AS240AJ 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 components for industrial, automotive, and defense markets.
The SNJ54AS240AJ belongs to TI's military logic family, engineered specifically for high-speed, radiation-tolerant bus interfacing in mission-critical systems where failure is not an option.
FAQ
What is the maximum operating temperature range for SNJ54AS240AJ?
The SNJ54AS240AJ is rated for continuous operation from –55°C to +125°C, fully qualified per MIL-PRF-38535 requirements. This range is validated across all electrical parameters including propagation delay, output drive, and 3-state leakage, making SNJ54AS240AJ suitable for extreme-environment deployment in jet engines, space vehicles, and armored vehicle electronics.
Does SNJ54AS240AJ support true bidirectional data flow?
No, SNJ54AS240AJ is a unidirectional noninverting buffer only-it does not support bidirectional data transfer. Each of its eight channels flows strictly from A-input to Y-output. True bidirectional operation requires separate transceivers like the SN74AS861 or dedicated bus transceivers; SNJ54AS240AJ serves exclusively as a one-way driver or isolator.
Can SNJ54AS240AJ be used with 3.3 V logic systems?
SNJ54AS240AJ is a 5 V TTL-family device and is not 3.3 V tolerant. Its absolute maximum input voltage is 7 V, but VIH minimum is 2.0 V and VIL maximum is 0.4 V-designed explicitly for 5 V signaling. Direct interface with 3.3 V systems requires level-shifting circuitry; using SNJ54AS240AJ without translation risks marginal logic thresholds or damage under overvoltage conditions.
What is the purpose of the pnp input structure in SNJ54AS240AJ?
The pnp input structure in SNJ54AS240AJ reduces dc input loading by limiting IIH to 20 µA and IIL to –0.5 mA (OE) or –1 mA (A inputs). This minimizes current draw from upstream drivers-especially critical when buffering clock or address lines from low-drive-capability sources like microcontrollers or FPGAs-thereby preserving signal integrity and reducing cumulative loading on shared buses.
Is SNJ54AS240AJ pin-compatible with SN74AS240AN?
Yes, SNJ54AS240AJ and SN74AS240AN share identical pinout, logic function, and electrical specifications-including 64 mA IOL and sub-7 ns propagation delay. The only differences are packaging (CDIP-J vs. PDIP-N) and qualification: SNJ54AS240AJ is MIL-PRF-38535 screened for –55°C to +125°C, while SN74AS240AN is commercial-grade (0°C to 70°C) with no military screening.
SNJ54AS240AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54AS
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54AS240AJ FAQ
1.How can I place an order for SNJ54AS240AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AS240AJ 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 SNJ54AS240AJ reliable?
The price and inventory of SNJ54AS240AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AS240AJ is usually 5 days.
3.What payment methods are accepted for SNJ54AS240AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54AS240AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54AS240AJ?
SNJ54AS240AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54AS240AJ 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 SNJ54AS240AJ?
For technical support, including SNJ54AS240AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AS240AJ requirements.
6.How does Aetrix verify that SNJ54AS240AJ is sourced from the original manufacturer or authorized distributors?
All SNJ54AS240AJ 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 SNJ54AS240AJ meets industry standards.
7.What is the process for return or replacement of SNJ54AS240AJ?
All SNJ54AS240AJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AS240AJ, 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 SNJ54AS240AJ part is unused and in its original packaging.
Return procedure for SNJ54AS240AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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