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Texas Instruments SNJ54ACT240J
- Part No.:
- SNJ54ACT240J
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54ACT240J.pdf
- Description:
- 54ACT240 OCTAL BUFFERS/DRIVERS W
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
SNJ54ACT240J from Texas Instruments is a military-grade octal buffer/driver with 3-state outputs, designed for high-reliability bus interface and memory address driving in harsh environments. It operates from 4.5 V to 5.5 V, supports TTL-compatible inputs up to 5.5 V, delivers ≤8.5 ns propagation delay at 5 V, and features dual independent output-enable controls (1OE, 2OE) for flexible bus management in aerospace and defense systems.
For engineers reviewing the SNJ54ACT240J datasheet, SNJ54ACT240J pinout, SNJ54ACT240J application, or SNJ54ACT240J equivalent, this page provides verified functional modes, thermal performance data across military temperature range (–55°C to +125°C), package-specific pin mapping for CDIP-20, and validated alternatives for legacy military logic upgrades.
Technical Context
The SNJ54ACT240J implements two independent 4-bit inverting buffers, each with dedicated 3-state control: 1OE governs Y1–Y4 outputs (driven by A1–A4), while 2OE controls Y1–Y4 outputs (driven by A1–A4). Its balanced CMOS push-pull outputs source/sink ±24 mA at 5 V, enabling direct drive of transmission lines and heavy capacitive loads without external termination.
It adheres to MIL-PRF-38535 Class V requirements, with absolute maximum ratings including VCC = –0.5 V to 7 V and VI/VO = –0.5 V to VCC+0.5 V. Input transition rate is specified at ≤8 ns/V, and ICC remains ≤80 µA at 5.5 V, supporting low-static-power system design in radiation-tolerant platforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across wide military power rail tolerances. |
| Propagation Delay (tPLH/tPHL) | ≤8.5 ns at 5 V - Enables high-speed bus arbitration in real-time avionics subsystems. |
| Output Drive (IOL/IOH) | ±24 mA at 5 V - Sufficient to drive 50-Ω transmission lines or multiple TTL loads directly. |
| Input Compatibility | TTL-compatible - Interfaces seamlessly with legacy 74LS and 74F logic without level shifters. |
| Operating Temperature | –55°C to +125°C - Qualified for extended-range deployment in engine bays, radar modules, and space-qualified payloads. |
| 3-State Enable Logic | Active-low OE (1OE, 2OE) - Allows independent control of two 4-bit buses for time-multiplexed data routing. |
| Power Dissipation Capacitance | 45 pF per buffer - Predictable dynamic power consumption for thermal modeling in sealed enclosures. |
Pinout & Package
SNJ54ACT240J uses a 20-pin Ceramic Dual In-line Package (CDIP, J package), 24.33 mm × 9.4 mm footprint, with 2.54 mm lead pitch and through-hole mounting. The package includes internal hermetic sealing for moisture resistance and long-term reliability in high-humidity operational environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Input | Active-low enable for first 4-bit buffer group (Y1–Y4 driven by A1–A4). |
| 1A1–1A4 | Inputs | Inverting data inputs for first buffer group; accept TTL-level signals up to 5.5 V. |
| 2OE | Input | Active-low enable for second 4-bit buffer group (Y1–Y4 driven by A1–A4). |
| 2A1–2A4 | Inputs | Inverting data inputs for second buffer group; electrically isolated from first group. |
| 1Y1–1Y4, 2Y1–2Y4 | Outputs | CMOS push-pull outputs with high-impedance state when respective OE is high. |
| VCC (Pin 20) | Power | 5-V supply input; decoupling capacitor required within 10 mm for noise immunity. |
| GND (Pin 10) | Ground | Reference return path; must be connected to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state buffer architecture | Two independent 4-bit groups allow simultaneous or time-sliced bus isolation without contention. |
| Balanced CMOS push-pull outputs | Symmetric sourcing/sinking capability (±24 mA) ensures clean signal edges into mismatched loads. |
| MIL-PRF-38535 Class V qualification | Guarantees screening, testing, and traceability for mission-critical defense electronics programs. |
| TTL-input compatibility | Accepts standard 0.8 V / 2.0 V logic thresholds-no external biasing needed for legacy system integration. |
| High-noise-immunity design | Input clamp current ±20 mA and Δt/Δv ≤8 ns/V limit susceptibility to EMI in RF-dense platforms. |
Applications
| Avionics Data Bus Interface | Radar Signal Conditioning |
|---|---|
|
Use Scenario: Isolating and buffering ARINC 429 or MIL-STD-1553B address/data lines between flight computer and sensor modules. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing bidirectional bus separation with <8.5 ns timing margin for deterministic latency. Use Value: Prevents bus contention during hot-swap module insertion and enables synchronized read/write cycles across distributed avionics nodes. |
Use Scenario: Driving high-capacitance analog-to-digital converter (ADC) control lines in phased-array radar front ends. IC Role / Device Role / Timing Role: Low-skew buffer delivering precise timing pulses to ADC sample clocks and channel select lines. Use Value: Maintains sub-nanosecond edge integrity across 20 cm PCB traces, minimizing aperture jitter in 12-bit+ sampling systems. |
| Secure Communication Module | Missile Guidance Processor |
|
Use Scenario: Enabling/disabling cryptographic co-processor I/O lanes during secure boot and key exchange sequences. IC Role / Device Role / Timing Role: Dual-OE controlled gate for hardware-enforced data path isolation between trusted and untrusted domains. Use Value: Meets NSA Type 1 encryption platform requirements for physical layer access control and side-channel mitigation. |
Use Scenario: Interfacing inertial measurement unit (IMU) SPI outputs to radiation-hardened microcontroller in guidance control loop. IC Role / Device Role / Timing Role: Robust level-shifting buffer ensuring reliable communication under single-event transients (SETs). Use Value: Operates continuously across –55°C to +125°C without derating, sustaining closed-loop response time <100 µs in tactical missile seekers. |
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 |
|---|---|---|---|
| SN74ACT240N | Commercial-grade (–40°C to +85°C), same pinout and logic function but non-military screening. | Lacks MIL-PRF-38535 qualification; unsuitable for flight-critical or radiation-exposed deployments. | Select for cost-sensitive ground-test equipment or non-flight prototypes where environmental stress is minimal. |
| SNJ54ACT240W | Same military spec, but CFP (Ceramic Flatpack) package: 25-pin tube, lower profile (4.7 mm height), no leads. | Better high-frequency EMI shielding and thermal dissipation; requires reflow-compatible land pattern. | Prefer for SWaP-constrained guided munitions or satellite payload boards needing hermetic sealing and minimal Z-height. |
Compared with SN74ACT240N, SNJ54ACT240J offers full military temperature range and process control, while SNJ54ACT240W provides superior thermal performance and EMI containment in flatpack form-both retain identical logic behavior and timing specs.
Availability
SNJ54ACT240J is available at Aetrix Electronics and suitable for avionics data bus interface, radar signal conditioning, secure communication module, and missile guidance processor applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54ACT240J 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 aerospace, defense, and industrial markets.
SNJ54ACT240J belongs to TI's military logic family, engineered for extreme environment operation, radiation tolerance, and compliance with MIL-PRF-38535 Class V standards-targeting mission-critical control, telemetry, and sensor interface systems.
FAQ
What is the operating temperature range of SNJ54ACT240J?
SNJ54ACT240J is rated for –55°C to +125°C, meeting MIL-PRF-38535 Class V requirements for operation in jet engine bays, space launch vehicles, and high-altitude reconnaissance platforms. This range is verified via temperature cycling, burn-in, and parametric testing per military specification-not extrapolated from commercial variants. SNJ54ACT240J maintains full electrical performance across this span without derating.
Does SNJ54ACT240J support TTL-level inputs?
Yes, SNJ54ACT240J accepts TTL-compatible inputs with VIL ≤ 0.8 V and VIH ≥ 2.0 V at VCC = 4.5 V to 5.5 V, and inputs tolerate up to 5.5 V regardless of supply voltage. This allows direct interfacing with legacy 74LS, 74F, and 74ALS families without level-shifting circuitry. SNJ54ACT240J's input structure includes clamping diodes rated for ±20 mA, enhancing robustness against overvoltage transients.
What is the maximum propagation delay for SNJ54ACT240J at 5 V?
The maximum propagation delay (tPLH/tPHL) for SNJ54ACT240J is 8.5 ns at VCC = 5 V and TA = 25°C, as specified in the switching characteristics table. This value is guaranteed across the full military temperature range, with typical delay dropping to 6 ns at 25°C. SNJ54ACT240J's consistent timing enables deterministic bus arbitration in real-time avionics control loops.
How many independent 3-state control inputs does SNJ54ACT240J have?
SNJ54ACT240J has two independent active-low 3-state enable inputs: 1OE controls the first 4-bit buffer group (A1–A4 → Y1–Y4), and 2OE controls the second group (A1–A4 → Y1–Y4). This dual-enable architecture allows selective isolation of two separate data paths on a shared bus, preventing contention during multi-master arbitration. SNJ54ACT240J's function table confirms high-impedance output state when either OE is high.
Is SNJ54ACT240J RoHS-compliant?
No, SNJ54ACT240J uses SnPb (tin-lead) lead finish and is not RoHS-compliant, as confirmed in the PACKAGE OPTION ADDENDUM where RoHS status is marked "No" for all SNJ54ACT240 variants. It complies with J-STD-006 for high-reliability solderability and meets MIL-STD-202 test methods for hermeticity and mechanical robustness. SNJ54ACT240J is intended for legacy military systems where Pb-free exemptions apply per JEDEC J-STD-020.
SNJ54ACT240J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54ACT
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54ACT240J FAQ
1.How can I place an order for SNJ54ACT240J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ACT240J 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 SNJ54ACT240J reliable?
The price and inventory of SNJ54ACT240J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ACT240J is usually 5 days.
3.What payment methods are accepted for SNJ54ACT240J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54ACT240J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54ACT240J?
SNJ54ACT240J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ACT240J 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 SNJ54ACT240J?
For technical support, including SNJ54ACT240J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ACT240J requirements.
6.How does Aetrix verify that SNJ54ACT240J is sourced from the original manufacturer or authorized distributors?
All SNJ54ACT240J 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 SNJ54ACT240J meets industry standards.
7.What is the process for return or replacement of SNJ54ACT240J?
All SNJ54ACT240J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ACT240J, 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 SNJ54ACT240J part is unused and in its original packaging.
Return procedure for SNJ54ACT240J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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