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Texas Instruments SNJ54F240J
- Part No.:
- SNJ54F240J
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54F240J.pdf
- Description:
- 54F240 OCTAL BUFFERS/DRIVERS WIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,806
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Product details
Overview
SNJ54F240J from Texas Instruments is a military-grade octal inverting buffer/driver with 3-state outputs, designed for memory address bus driving and clock distribution in high-reliability systems. It features dual 4-bit sections, active-low output-enable (OE) control per section, ±55°C to +125°C operating range, 5 V nominal supply, and CDIP-20 package. Used in avionics data buses and hardened embedded controllers.
For engineers reviewing the SNJ54F240J datasheet, SNJ54F240J pinout, SNJ54F240J application, or SNJ54F240J equivalent, key selection criteria include military temperature rating, 3-state bus-driving capability, inverting logic function, output drive strength (48 mA low-level), and compatibility with legacy TTL bus architectures.
Technical Context
The SNJ54F240J implements two independent 4-bit inverting buffer sections, each with dedicated active-low output-enable (1OE, 2OE) inputs. Data flows from A inputs to Y outputs only when OE is low; outputs enter high-impedance state when OE is high - enabling bidirectional bus sharing without contention.
It uses bipolar F-type (fast TTL) technology, delivering tPLH/tPHL propagation delays of 2.2–7 ns and tPZL/tPHZ enable/disable times of 1.2–12.5 ns under 50 pF load. Input thresholds (VIH = 2 V, VIL = 0.8 V) and output voltage levels (VOH = 2.4 V min at –12 mA, VOL = 0.55 V max at 48 mA) ensure robust noise margin in mixed-logic environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with dual 4-bit sections and independent active-low OE control |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems and tolerant of rail variation |
| Operating Temperature | –55°C to +125°C - qualified for military/aerospace applications requiring extreme environmental resilience |
| Output Drive | 48 mA sink per output (IOL) - sufficient to drive 50 Ω transmission lines or multiple TTL loads |
| Propagation Delay | 2.2–7 ns (tPLH/tPHL) - enables reliable operation in sub-100 MHz synchronous bus timing budgets |
| 3-State Leakage | ±50 µA (IOZL/IOZH) - ensures minimal bus leakage during high-impedance mode in multi-driver configurations |
| Input Clamp Current | –18 mA - protects against transient overvoltage on input pins without external diodes |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP-20), 0.3-inch width, through-hole mounting, hermetically sealed for high-reliability mil-spec use. Pin 1 identified by notch or dot; pin 10 and pin 20 are GND and VCC respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable inputs | Enable/disable respective 4-bit sections independently; asserted low to pass inverted data |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight total inputs; each A group feeds corresponding Y output with inversion |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state outputs | Eight buffered, inverted outputs; high-Z when OE is high - prevents bus contention |
| VCC (Pin 20) | Positive supply | 5 V nominal power rail; decoupling capacitor required near pin for fast switching stability |
| GND (Pin 10) | Ground reference | Common return path for all signals and supply; critical for noise immunity in mixed-signal boards |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit sections | Enables selective bus gating - e.g., isolate address vs. control lines using separate OE controls |
| 3-State outputs with symmetrical OE | Allows time-multiplexed sharing of single data/address bus among multiple drivers without external arbitration |
| Military temperature qualification | Validated operation from –55°C to +125°C supports deployment in engine bays, space payloads, and field-deployed defense electronics |
| F-type TTL process | Delivers faster switching than standard TTL while maintaining pin-compatible voltage thresholds and drive capability |
| High noise immunity | 2 V VIH / 0.8 V VIL thresholds provide >1.2 V DC noise margin - essential in electrically noisy military platforms |
Applications
| Avionics Data Bus Interface | Military Memory Address Buffering |
|---|---|
Use Scenario: Interfacing microprocessor address bus to multiple memory modules in flight control computers. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address lines from shared memory bus; OE synchronized to memory select strobes. Use Value: Prevents address bus contention during memory refresh cycles; maintains signal integrity across long PCB traces in vibration-prone airframes. | Use Scenario: Driving address registers in radiation-tolerant FPGA configuration circuits within satellite payload controllers. IC Role / Device Role / Timing Role: Octal inverting driver translating FPGA I/O voltages to legacy TTL-compatible address bus levels with precise enable timing. Use Value: Ensures deterministic setup/hold timing for SRAM access under thermal cycling; CDIP package resists outgassing in vacuum environments. |
| Hardened Industrial PLC Backplane | Tactical Radio Baseband Timing Distribution |
Use Scenario: Isolating CPU address/data buses from modular I/O expansion slots in explosion-proof programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling hot-swap I/O module detection via controlled OE assertion during slot enumeration. Use Value: Eliminates bus glitches during module insertion/removal; military temp rating ensures reliability in oilfield ambient extremes. | Use Scenario: Distributing synchronized clock and control signals across RF transceiver ASICs in manpack radios. IC Role / Device Role / Timing Role: Low-skew inverting buffer retiming baseband clocks and frame sync pulses before fanout to multiple receivers. Use Value: Maintains <7 ns propagation delay matching across all eight outputs - critical for coherent multi-channel demodulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54F244J | Non-inverting output logic (vs. inverting in SNJ54F240J); otherwise identical pinout, timing, and military spec | Used where signal polarity must be preserved (e.g., direct address mirroring without logic inversion) | Select SNJ54F244J only when system logic requires non-inverted buffering; no PCB change needed |
| SNJ54LS240J | Lower drive (24 mA IOL), slower speed (15 ns max tPLH), LS-TTL process; same CDIP-20 footprint and military temp range | Suitable for lower-power, cost-sensitive legacy systems where speed margin is acceptable | Choose SNJ54LS240J for reduced power consumption (<25 mA ICC) in thermally constrained enclosures |
Compared with SNJ54F240J, SNJ54F244J preserves input polarity for direct address routing, while SNJ54LS240J trades speed and drive strength for lower static current - enabling drop-in substitution only where timing and loading requirements permit relaxation.
Availability
SNJ54F240J is available at Aetrix Electronics and suitable for avionics data bus interface, military memory address buffering, and hardened industrial PLC backplane applications requiring stable component supply across extended product lifecycles.
Supply support for SNJ54F240J 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.
The SNJ54F series belongs to TI's military-qualified fast TTL logic family, engineered for deterministic timing, wide-temperature operation, and compatibility with legacy aerospace and defense computing architectures.
FAQ
What is the logic function of the SNJ54F240J?
The SNJ54F240J is an octal inverting buffer/driver with two independent 4-bit sections, each featuring active-low output-enable (OE) control. When OE is low, it passes inverted data from A inputs to Y outputs; when OE is high, outputs enter high-impedance state. This function is confirmed in the device's function table and logic diagram in the official SDFS061A datasheet.
Does the SNJ54F240J support 3.3 V operation?
No, the SNJ54F240J is specified only for 4.5 V to 5.5 V supply operation and is not rated for 3.3 V logic systems. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5 V TTL compatibility. Using SNJ54F240J below 4.5 V may result in undefined logic states or degraded noise margins.
What package type does the SNJ54F240J use?
The SNJ54F240J uses a Ceramic Dual-In-Line Package (CDIP-20), designated "J" in TI's packaging nomenclature. It is a 20-pin, 0.3-inch wide, through-hole, hermetically sealed ceramic package with tin-lead (SNPB) lead finish, rated for –55°C to +125°C operation.
How does the SNJ54F240J differ from the commercial SN74F240?
The SNJ54F240J is the military-qualified version of the SN74F240, differing primarily in temperature range (–55°C to +125°C vs. 0°C to +70°C), screening level (QML-38510 compliance), and packaging (CDIP vs. PDIP/SOIC options). Electrical specifications are otherwise identical, including propagation delay, drive strength, and logic function.
Can the SNJ54F240J be used as a direct replacement for SN54F240J?
Yes, SNJ54F240J and SN54F240J are functionally and pinout-identical military-grade variants; both are CDIP-20 packaged, operate from –55°C to +125°C, and meet the same electrical specifications. The "J" suffix denotes the same package, and "SNJ" is TI's standardized prefix for JAN-qualified (military) devices - making them interchangeable in design and procurement.
SNJ54F240J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54F
- 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
SNJ54F240J FAQ
1.How can I place an order for SNJ54F240J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54F240J 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 SNJ54F240J reliable?
The price and inventory of SNJ54F240J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54F240J is usually 5 days.
3.What payment methods are accepted for SNJ54F240J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54F240J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54F240J?
SNJ54F240J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54F240J 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 SNJ54F240J?
For technical support, including SNJ54F240J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54F240J requirements.
6.How does Aetrix verify that SNJ54F240J is sourced from the original manufacturer or authorized distributors?
All SNJ54F240J 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 SNJ54F240J meets industry standards.
7.What is the process for return or replacement of SNJ54F240J?
All SNJ54F240J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54F240J, 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 SNJ54F240J part is unused and in its original packaging.
Return procedure for SNJ54F240J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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