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Texas Instruments SNJ54ACT244W
- Part No.:
- SNJ54ACT244W
- Manufacturer:
- Texas Instruments
- Package:
- 20-CFlatPack
- Datasheet:
-
SNJ54ACT244W.pdf
- Description:
- 54ACT244 OCTAL BUFFERS/DRIVERS W
- Quantity:
- Payment:
- Shipping:
Inventory:4,801
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Product details
Overview
SNJ54ACT244 from Texas Instruments is a military-grade octal non-inverting buffer/driver with 3-state outputs, designed for high-reliability bus interfacing in harsh environments. It operates from 4.5 V to 5.5 V, delivers ±24 mA output drive per channel, achieves 9.5 ns max propagation delay at 5 V, and supports –55 °C to +125 °C operation - used in radiation-tolerant telemetry systems and hardened avionics backplanes.
For engineers reviewing the SNJ54ACT244 datasheet, SNJ54ACT244 pinout, SNJ54ACT244 application, or SNJ54ACT244 equivalent, key selection criteria include its MIL-PRF-38535 qualification, dual 4-bit independent output-enable control, TTL-compatible inputs, high-impedance state timing (tPZH/tPLZ ≤ 9.5 ns), and compatibility with legacy 20-pin CFP and CDIP layouts.
Technical Context
The SNJ54ACT244 implements two independent 4-bit buffer sections, each with active-low output-enable (1OE, 2OE) controlling high-impedance states. Its TTL-compatible inputs accept voltages up to 5.5 V, enabling mixed-voltage interface with legacy logic families without level shifters.
It features rail-to-rail output swing (VOH ≥ 4.4 V, VOL ≤ 0.5 V at 24 mA), guaranteed switching performance across full military temperature range, and input clamp current rating of ±20 mA - critical for ESD robustness in field-deployable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation under wide-input power supply variation common in aerospace power buses. |
| Max Propagation Delay | 9.5 ns at 5 V - enables reliable 100+ MHz bus clocking in synchronous data transfer applications. |
| Output Drive | ±24 mA per channel - sufficient to directly drive terminated transmission lines or multiple TTL loads without external buffers. |
| Operating Temperature | –55 °C to +125 °C - qualified for deployment in engine compartments, space payloads, and defense electronics. |
| Input Compatibility | TTL-compatible (VIH = 2 V min, VIL = 0.8 V max at 5 V) - interoperable with legacy 74LS/74F logic without translation circuitry. |
| ESD Rating (HBM) | ±2000 V - meets MIL-STD-883 Class 3015.7 requirements for handling in controlled environments. |
Pinout & Package
SNJ54ACT244 is supplied in a 20-pin CFP (Ceramic Flatpack) package, hermetically sealed for moisture resistance and thermal stability in extended military temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable inputs - independently disable each 4-bit section into high-impedance state for bus arbitration. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - accept TTL-level signals; tolerant to 5.5 V regardless of VCC. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Non-inverting buffered outputs - drive loads with ±24 mA capability and rail-aligned VOH/VOL. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize noise coupling in high-speed switching. |
| 20 | VCC | Power supply - requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-38535 Qualified | Full parametric testing performed per military specification - eliminates need for incoming lot screening by end users. |
| Dual Independent OE Control | Separate 1OE and 2OE pins allow selective tri-stating of upper/lower nibbles - essential for partial bus isolation in fault-tolerant architectures. |
| Input Overvoltage Tolerance | Inputs accept up to 5.5 V regardless of VCC - enables safe interfacing with 5 V logic even during brownout conditions. |
| High-Drive Output Stage | 24 mA sink/source per output - drives 50 Ω transmission lines or up to 10 standard TTL loads directly. |
| Low Propagation Skew | tPLH/tPHL matching ≤ 1 ns across channels - preserves signal integrity in parallel data paths such as address/data buses. |
Applications
| Avionics Data Bus Interface | Secure Telemetry Transmitter |
|---|---|
|
Use Scenario: Isolating and buffering ARINC 429 or MIL-STD-1553B bus drivers in flight control computers. IC Role / Device Role / Timing Role: Bidirectional buffer with independent OE control manages signal directionality and prevents bus contention during mode transitions. Use Value: Guaranteed –55 °C to +125 °C operation and MIL-PRF-38535 qualification ensure uninterrupted function during rapid thermal cycling in high-altitude flight. |
Use Scenario: Driving encrypted telemetry data streams from FPGAs to RF modulators in satellite uplink subsystems. IC Role / Device Role / Timing Role: High-speed octal driver translates FPGA I/O voltage levels to robust 5 V CMOS-compatible signals with minimal skew. Use Value: 9.5 ns max tpd and ±24 mA drive maintain signal fidelity over 15 cm PCB traces without termination resistors. |
| Radiation-Hardened Payload Controller | Hardened Ground Support Equipment |
|
Use Scenario: Interfacing radiation-tolerant microcontrollers to sensor arrays in deep-space probe command modules. IC Role / Device Role / Timing Role: Level-shifting buffer isolates sensitive MCU I/O from noisy analog sensor power domains while preserving timing margins. Use Value: Input clamp current rating of ±20 mA suppresses single-event transients induced by cosmic rays without latch-up. |
Use Scenario: Signal conditioning and bus buffering in ground-based test rigs simulating missile guidance system interfaces. IC Role / Device Role / Timing Role: Octal 3-state driver enables dynamic reconfiguration of stimulus/response paths during automated functional test sequences. Use Value: Dual OE control allows real-time switching between test patterns and live sensor feedback without hardware rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT244FK | LCCC (20-pin) package with leadless ceramic construction; identical electrical specs and MIL-PRF-38535 compliance. | Better thermal dissipation (RθJA = 67.7 °C/W vs. CFP's 126.2 °C/W) and lower mass - preferred for vibration-sensitive platforms. | Select SNJ54ACT244FK when board space permits larger footprint and thermal management is prioritized over hermetic sealing. |
| SN54ACT244J | CDIP (20-pin) package with through-hole leads; same operating range and drive strength but higher RθJA (117.2 °C/W). | Easier manual prototyping and rework; compatible with legacy wave-solder processes but less suitable for high-vibration mounting. | Choose SN54ACT244J for lab validation, repairable systems, or where existing tooling mandates DIP sockets. |
Compared with SNJ54ACT244, SNJ54ACT244FK offers superior thermal performance in compact form factors, while SN54ACT244J provides mechanical robustness and soldering flexibility - both retain identical logic behavior and military qualification, enabling direct substitution where package constraints allow.
Availability
SNJ54ACT244 is available at Aetrix Electronics and suitable for avionics data bus interface, secure telemetry transmitter, radiation-hardened payload controller, and hardened ground support equipment requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for SNJ54ACT244 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.
The SNx4ACT244 family was engineered to replace legacy 74ACT series devices in mission-critical systems demanding MIL-PRF-38535 compliance, extended temperature resilience, and deterministic 3-state timing behavior.
FAQ
What is the maximum operating temperature range for SNJ54ACT244?
SNJ54ACT244 is rated for continuous operation from –55 °C to +125 °C, fully compliant with MIL-PRF-38535 Class B requirements. This range is validated across all electrical parameters including propagation delay, output drive, and input thresholds - making SNJ54ACT244 suitable for engine-mounted avionics and space-based electronics where ambient extremes are routine.
Does SNJ54ACT244 support 3.3 V logic interfacing?
SNJ54ACT244 does not support native 3.3 V logic interfacing: its minimum VCC is 4.5 V, and inputs require VIH ≥ 2 V at 5 V VCC. However, its inputs tolerate up to 5.5 V, allowing safe connection to 3.3 V outputs via series resistors or level translators - but direct 3.3 V drive may fail to meet VIH threshold reliably. SNJ54ACT244 must operate at 5 V nominal supply.
How is the output-enable functionality implemented on SNJ54ACT244?
SNJ54ACT244 uses two active-low output-enable inputs: 1OE controls Y1–Y4 (pins 18, 16, 14, 12), and 2OE controls Y1–Y4 of the second section (pins 9, 7, 5, 3). When either OE is high, its corresponding four outputs enter high-impedance state; when low, they pass non-inverted A-input signals. This dual-OE architecture enables granular bus partitioning without external logic.
What packaging options are available for SNJ54ACT244?
SNJ54ACT244 is exclusively offered in the 20-pin CFP (Ceramic Flatpack) package, designated by suffix 'W' in the part number. Unlike commercial SN74ACT244 variants, the SNJ54ACT244W variant has no SSOP, SOIC, or TSSOP options - only hermetically sealed CFP for military environmental compliance, as confirmed in TI's PACKAGE OPTION ADDENDUM (Rev. March 2024).
Is SNJ54ACT244 pin-compatible with SN74ACT244?
SNJ54ACT244 shares identical pinout and logic function with SN74ACT244 across all 20-pin packages (CFP, CDIP, LCCC), including pin assignments for VCC, GND, OE, A inputs, and Y outputs. However, SNJ54ACT244W (CFP) is not mechanically interchangeable with SN74ACT244's surface-mount packages (e.g., TSSOP, VQFN); only through-hole or ceramic variants maintain physical compatibility.
SNJ54ACT244W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54ACT
- Package/Case:
- 20-CFlatPack
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-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:
- Surface Mount
- Supplier Device Package:
- 20-CFP
SNJ54ACT244W FAQ
1.How can I place an order for SNJ54ACT244W through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ACT244W 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 SNJ54ACT244W reliable?
The price and inventory of SNJ54ACT244W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ACT244W is usually 5 days.
3.What payment methods are accepted for SNJ54ACT244W?
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4.How is shipping managed for SNJ54ACT244W?
SNJ54ACT244W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ACT244W 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 SNJ54ACT244W?
For technical support, including SNJ54ACT244W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ACT244W requirements.
6.How does Aetrix verify that SNJ54ACT244W is sourced from the original manufacturer or authorized distributors?
All SNJ54ACT244W 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 SNJ54ACT244W meets industry standards.
7.What is the process for return or replacement of SNJ54ACT244W?
All SNJ54ACT244W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ACT244W, 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 SNJ54ACT244W part is unused and in its original packaging.
Return procedure for SNJ54ACT244W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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