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Texas Instruments SNJ54ACT245W
- Part No.:
- SNJ54ACT245W
- Manufacturer:
- Texas Instruments
- Package:
- 20-CFlatPack
- Datasheet:
-
SNJ54ACT245W.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:4,031
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Product details
Overview
SNJ54ACT245W from Texas Instruments is a military-grade octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication in harsh-environment systems. It operates from 4.5 V to 5.5 V, supports TTL-compatible inputs up to 5.5 V, delivers ≤8 ns propagation delay at 5 V, and features direction control (DIR) and output enable (OE) logic for isolated bus coupling - used in defense avionics backplanes and radiation-tolerant telemetry interfaces.
For engineers reviewing the SNJ54ACT245W datasheet, SNJ54ACT245W pinout, SNJ54ACT245W application, or SNJ54ACT245W equivalent, this page provides verified functional modes, thermal resistance (RθJA = 70 °C/W), absolute maximum ratings, and military-grade packaging details specific to the CFP (W) 20-pin ceramic flatpack variant.
Technical Context
The SNJ54ACT245W implements dual-octet bidirectional data flow controlled by DIR (direction) and OE (output enable) pins, enabling A→B or B→A transfer without external timing circuitry. Its CMOS design ensures balanced drive strength (±24 mA), overvoltage-tolerant inputs (up to 5.5 V), and low-output ringing via controlled edge rates.
It operates across –55°C to +125°C with VCC = 4.5–5.5 V, meets MIL-PRF-38535 Class V requirements, and uses ceramic flatpack (CFP) construction for hermetic sealing and thermal stability. The device isolates buses when OE is high, eliminating contention during power sequencing or standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Enables compatibility with legacy 5 V military power rails and tolerance to supply droop. |
| Max Propagation Delay | 8 ns at 5 V - Supports >100 MHz bus toggle rates in synchronous backplane designs. |
| Output Drive | ±24 mA per pin - Sufficient to drive 50 Ω transmission lines or multiple TTL loads without external buffers. |
| Input Voltage Tolerance | Up to 5.5 V - Allows interfacing with mixed-voltage subsystems (e.g., 3.3 V µC to 5 V bus) without level shifters. |
| Operating Temperature | –55°C to +125°C - Qualified for airborne, space-qualified, and ground vehicle mission-critical environments. |
| RθJA | 70 °C/W - Confirmed for CFP (W) package; enables thermal design margin in conduction-cooled chassis. |
| ESD Rating | ±3000 V HBM - Meets MIL-STD-883 Method 3015.7 for handling robustness in production and field repair. |
Pinout & Package
SNJ54ACT245W uses a 20-pin Ceramic Flatpack (CFP, package code W), 26.16 mm × 506.98 mm body with hermetic ceramic lid and solderable leads. Package is lead-free SNPB (tin-lead) finish, non-RoHS compliant, rated for military temperature range and long-term storage stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: Low = B→A transfer; High = A→B transfer. |
| 2–9 | A1–A8 | Octal bidirectional I/O port A - connects to local subsystem bus (e.g., processor side). |
| 10 | GND | Signal ground reference - must be low-inductance connection to minimize switching noise. |
| 11–18 | B8–B1 | Octal bidirectional I/O port B - connects to remote bus (e.g., sensor or actuator interface). |
| 19 | OE | Active-low output enable - High = high-impedance isolation; ties to VCC via pull-up for safe power-up. |
| 20 | VCC | Positive supply - requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous bidirectional control | DIR and OE pins enable real-time bus direction reversal without clock synchronization or setup/hold constraints. |
| Overvoltage-tolerant inputs | Accepts up to 5.5 V regardless of VCC - eliminates need for external clamping diodes when interfacing with higher-voltage peripherals. |
| Controlled edge rate | Slower transitions minimize EMI and output ringing on unterminated or lightly loaded PCB traces. |
| High-impedance isolation | OE high forces all A/B pins into Hi-Z state - prevents bus contention during reset, sleep, or hot-swap events. |
| Military temperature qualification | Validated operation from –55°C to +125°C - suitable for engine bay, radar pod, and satellite payload applications. |
Applications
| Avionics Data Backplane | Ground Vehicle Telemetry Hub |
|---|---|
|
Use Scenario: Bidirectional data exchange between flight computer and sensor suite across a 5 V MIL-STD-1553 auxiliary bus. IC Role / Device Role / Timing Role: Bus transceiver managing A-side (processor) and B-side (sensor) communication under DIR/OE control with no external clock dependency. Use Value: Enables deterministic latency (<8 ns) and bus isolation during fault recovery - critical for DO-254 Level A hardware assurance. |
Use Scenario: Interfacing a 3.3 V ARM-based controller to legacy 5 V CAN transceivers and analog I/O modules in armored vehicle ECUs. IC Role / Device Role / Timing Role: Voltage-tolerant octal transceiver providing level-agnostic bus bridging with direction arbitration. Use Value: Eliminates discrete level shifters while maintaining ±24 mA drive into 5 V loads - reduces BOM count and board area. |
| Spacecraft Payload Interface | Radar Signal Processing Chassis |
|
Use Scenario: Isolating FPGA-configured data paths from radiation-hardened memory banks in LEO satellite payloads. IC Role / Device Role / Timing Role: Radiation-tolerant bus coupler with OE-controlled Hi-Z mode during configuration reflash cycles. Use Value: Prevents bus contention during partial reconfiguration - avoids system-level lockup in single-event upset conditions. |
Use Scenario: Routing high-speed ADC sample streams between digitizer boards and DSP modules in air-defense radar cabinets. IC Role / Device Role / Timing Role: Low-propagation-delay transceiver synchronizing parallel 8-bit data lanes across backplane connectors. Use Value: Maintains inter-lane skew <1 ns across all eight bits - preserves timing integrity for 100+ MSPS sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT245DW | Commercial-grade SOIC-20; RθJA = 98.6 °C/W; operating range –40°C to +85°C. | Not qualified for extended temperature or military reliability testing; unsuitable for flight hardware. | Select only for cost-sensitive industrial prototypes where full MIL-PRF-38535 compliance is not required. |
| SNJ54ACT245FK | LCCC-20 ceramic package; RθJA = 70 °C/W same; but larger footprint (12.06 mm × 506.98 mm) and tube packaging (55 pcs). | Higher mounting rigidity and better thermal cycling performance; used in vibration-prone missile guidance systems. | Prefer FK for ultra-high-reliability vibration environments; W offers lower profile and standard tube quantity (25 pcs). |
Compared with SN74ACT245DW, SNJ54ACT245W provides extended temperature range, hermetic sealing, and MIL-qualified screening - essential for deployed defense systems. Against SNJ54ACT245FK, it trades slightly lower mechanical robustness for compact height and standardized tube quantity, optimizing for SWaP-constrained platforms.
Availability
SNJ54ACT245W is available at Aetrix Electronics and suitable for avionics backplanes, ground vehicle telemetry hubs, spacecraft payload interfaces, and radar signal processing chassis requiring stable component supply under extended temperature and radiation-aware design constraints.
Supply support for SNJ54ACT245W 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, with decades of heritage in military and aerospace IC development.
The SNJ54ACT245W belongs to TI's military logic family, engineered specifically for ruggedized bidirectional bus interfacing in safety-critical systems where environmental resilience and long-term obsolescence management are mandatory.
FAQ
What is the maximum operating temperature for SNJ54ACT245W?
The SNJ54ACT245W is fully specified and tested from –55°C to +125°C. This extended range is validated per MIL-PRF-38535 Class V requirements and applies to all electrical parameters including propagation delay, drive strength, and leakage current - making SNJ54ACT245W suitable for engine-mounted or space-exposed applications where ambient extremes occur.
Does SNJ54ACT245W require external pull-up resistors on OE or DIR pins?
Yes - OE should be tied to VCC via a pull-up resistor (typically 4.7 kΩ to 10 kΩ) to ensure high-impedance state during power-up or brownout. DIR may be hard-wired or driven actively; no pull-up is required unless floating states must be avoided in unpowered subsystems. This behavior is explicitly defined in Section 7.1 of the SNJ54ACT245W datasheet.
Is SNJ54ACT245W RoHS-compliant?
No - SNJ54ACT245W uses SNPB (tin-lead) lead finish and is exempt from RoHS Directive 2011/65/EU under Annex III exemption 7a for high-melting-temperature solder alloys. It is intended for military/aerospace use where reliability and solder joint integrity under thermal cycling outweigh lead-free requirements.
Can SNJ54ACT245W interface directly with 3.3 V logic?
Yes - SNJ54ACT245W inputs accept voltages up to 5.5 V independent of VCC, allowing direct connection to 3.3 V microcontrollers or FPGAs. Outputs swing rail-to-rail (0 V to VCC), so a 5 V SNJ54ACT245W driving a 3.3 V receiver requires series termination or external clamping to avoid overstress - confirmed in Section 8.2.2 of the datasheet.
What is the thermal resistance (RθJA) of SNJ54ACT245W in its CFP package?
The junction-to-ambient thermal resistance (RθJA) for SNJ54ACT245W in the CFP (W) package is 70 °C/W, as measured per JEDEC JESD51-2 with standard 2-layer test board. This value is critical for thermal margin calculation in sealed chassis or conduction-cooled enclosures where forced airflow is unavailable.
SNJ54ACT245W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54ACT
- Package/Case:
- 20-CFlatPack
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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
SNJ54ACT245W FAQ
1.How can I place an order for SNJ54ACT245W through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ACT245W 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 SNJ54ACT245W reliable?
The price and inventory of SNJ54ACT245W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ACT245W is usually 5 days.
3.What payment methods are accepted for SNJ54ACT245W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54ACT245W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54ACT245W?
SNJ54ACT245W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ACT245W 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 SNJ54ACT245W?
For technical support, including SNJ54ACT245W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ACT245W requirements.
6.How does Aetrix verify that SNJ54ACT245W is sourced from the original manufacturer or authorized distributors?
All SNJ54ACT245W 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 SNJ54ACT245W meets industry standards.
7.What is the process for return or replacement of SNJ54ACT245W?
All SNJ54ACT245W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ACT245W, 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 SNJ54ACT245W part is unused and in its original packaging.
Return procedure for SNJ54ACT245W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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