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Texas Instruments SNJ54F245W
- Part No.:
- SNJ54F245W
- Manufacturer:
- Texas Instruments
- Package:
- 20-CFlatPack
- Datasheet:
-
SNJ54F245W.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:4,038
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Product details
Overview
SNJ54F245W from Texas Instruments is a military-grade octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between A and B buses in high-reliability systems. It operates across –55°C to 125°C, features DIR/OE control logic, supports 48 mA (A-side) / 96 mA (B-side) sink current, and uses ceramic flatpack (CFP) packaging for ruggedized PCB mounting.
For engineers reviewing the SNJ54F245W datasheet, SNJ54F245W pinout, SNJ54F245W application, or SNJ54F245W equivalent, this page delivers verified electrical specs, military temperature validation, CFP-20 package dimensions, functional truth table behavior, and direct TI-qualified alternatives for defense/aerospace bus isolation designs.
Technical Context
The SNJ54F245W implements TTL-compatible bipolar F-series logic with dual-directional 8-bit data flow controlled by DIR (direction) and OE (output enable) inputs. Its 3-state outputs provide high-impedance isolation when OE is high, enabling bus sharing without contention.
It uses open-collector compatible output stages with guaranteed VOL ≤ 0.55 V at IOL = 96 mA (B-side), VIH = 2 V minimum, and VIL = 0.8 V maximum - all validated over full military temperature range and 4.5–5.5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | F-series TTL - ensures compatibility with legacy 5-V bus systems and predictable noise margins |
| Operating Temperature | –55°C to 125°C - qualified for military/aerospace platforms requiring extreme environmental resilience |
| Supply Voltage Range | 4.5 V to 5.5 V - stable operation under regulated 5-V rail with ±10% tolerance |
| Max Output Sink Current | B-side: 96 mA - drives heavy capacitive loads or multiple TTL inputs without external buffering |
| Propagation Delay | tPLH/tPHL ≤ 7 ns - supports synchronous bus timing up to ~70 MHz in point-to-point configurations |
| 3-State Enable Time | tPZH/tPLZ ≤ 9 ns - fast bus release for time-critical arbitration and multiplexing |
| Input Clamp Current | –18 mA - protects against transient overvoltage on DIR/OE control lines |
Pinout & Package
Ceramic Flatpack (CFP) package, 20-pin, hermetically sealed, leadless ceramic construction with 0.51 mm pitch and 13.0 mm × 7.6 mm body size - optimized for high-reliability, low-outgassing applications in vacuum or extended thermal cycling environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs/Outputs | Left-side bidirectional data terminals - connect to source bus; direction determined by DIR |
| 11, 12, 13, 14, 15, 16, 17, 18 | B1–B8 Inputs/Outputs | Right-side bidirectional data terminals - connect to destination bus; direction determined by DIR |
| 9 | GND | Signal reference ground - must be low-inductance connection to minimize switching noise |
| 10 | VCC | +5 V power supply - requires local 0.1 µF ceramic decoupling adjacent to pin |
| 19 | DIR | Direction control input - low = B→A transfer; high = A→B transfer |
| 20 | OE | Output enable input - low = active; high = 3-state isolation of both A and B ports |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Data Flow | Single DIR pin selects A→B or B→A path - eliminates need for separate transmit/receive ICs |
| Full Bus Isolation | OE input disables all 16 I/Os simultaneously - prevents back-driving and signal contention during reset or standby |
| Military Qualification | QML-38535 compliant per MIL-PRF-38535 Class B - certified for flight-critical and defense electronics |
| High-Drive Outputs | B-side sinks 96 mA - interfaces directly with legacy TTL loads or long traces without line drivers |
| Low Propagation Skew | ≤ 0.5 ns max skew between channels - maintains data integrity across all 8 bits in parallel transfers |
Applications
| Avionics Data Bus Interface | Ground Test Equipment Backplane |
|---|---|
Use Scenario: Interfacing legacy ARINC 429 or MIL-STD-1553 subsystems with centralized flight computers using shared 5-V data highways. IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus isolation transceiver - synchronizes asynchronous subsystem clocks while preventing ground loops. Use Value: Enables deterministic 7-ns data handoff between avionics LRUs without added delay or signal degradation across temperature extremes. | Use Scenario: Reconfigurable test fixture connecting programmable logic controllers (PLCs) to sensor simulation modules via shared backplane wiring. IC Role / Device Role / Timing Role: Direction-controlled bus repeater - routes stimulus signals from controller to DUT or captures response data based on test phase. Use Value: Eliminates manual jumper changes; OE-controlled isolation prevents test interference during calibration or fault injection sequences. |
| Tactical Radio Baseband Processing | Secure Crypto Module Interconnect |
Use Scenario: Coupling FPGA-based modems to analog front-end ASICs in manpack radios operating in desert or arctic conditions. IC Role / Device Role / Timing Role: Ruggedized data bridge - handles burst-mode packet transfers between baseband and RF sections with immunity to ESD and thermal shock. Use Value: Maintains <100 ps inter-channel skew across –55°C to 125°C, preserving symbol alignment in QAM-64 waveforms. | Use Scenario: Secure key exchange interface between HSM (Hardware Security Module) and host processor in encrypted comms terminals. IC Role / Device Role / Timing Role: Tamper-resilient bus gate - isolates cryptographic engine during non-active periods using hardware-controlled OE assertion. Use Value: Prevents side-channel leakage via bus activity monitoring; DIR+OE dual-lock ensures no spurious data exposure during power transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54F245J | Same electrical specs and temp range, but in ceramic DIP (J) package - larger footprint, through-hole mount | Preferred for prototyping or legacy board rework where CFP reflow is unavailable | Select when manual assembly, socketing, or thermal cycling testing requires mechanical robustness over compactness |
| SNJ54F245FK | Same specs and temp range, but in LCCC (FK) package - leadless, 8.89 mm × 8.89 mm, 1.27 mm pitch | Suitable for high-density, low-profile modules where CFP height exceeds stack-up limits | Select when board space is constrained and surface-mount reflow capability exists for fine-pitch ceramic packages |
Compared with SNJ54F245W, SNJ54F245J offers easier hand-soldering and socket compatibility but increases PCB area by 2.3×; SNJ54F245FK reduces footprint by 45% and improves thermal dissipation but demands precision placement and reflow control.
Availability
SNJ54F245W is available at Aetrix Electronics and suitable for avionics integration, ground test equipment development, tactical radio manufacturing, and secure crypto module production requiring stable component supply across extended lifecycle programs.
Supply support for SNJ54F245W 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 for aerospace, defense, and industrial markets.
The SNJ54F series belongs to TI's military-qualified TTL logic family, engineered specifically for deterministic bus communication in mission-critical systems where parameter stability across temperature, radiation, and vibration is non-negotiable.
FAQ
What is the maximum clock rate supported by SNJ54F245W in a synchronous bus configuration?
The SNJ54F245W does not include an internal clock; it is an asynchronous transceiver. Its 7 ns max propagation delay enables reliable use in systems with bus toggle rates up to approximately 70 MHz, assuming proper trace length matching and termination. For SNJ54F245W, timing margin depends on external controller setup/hold times and PCB layout - not on an integrated oscillator or clock input.
Does SNJ54F245W support hot-swap or live-insertion on powered backplanes?
No, SNJ54F245W is not hot-swap rated. Its absolute maximum input voltage is 7 V and output clamp rating is –0.5 V to 5.5 V in disabled state, but it lacks built-in current limiting or slew-rate control for safe insertion into live 5-V buses. System-level protection circuitry must be added externally if live insertion is required for SNJ54F245W deployment.
Can SNJ54F245W be used with 3.3-V logic systems?
SNJ54F245W is strictly a 5-V TTL device. Its VIH minimum is 2.0 V and VIL maximum is 0.8 V, making it incompatible with 3.3-V CMOS logic levels without level translation. Driving SNJ54F245W inputs from 3.3-V sources risks marginal high-level recognition; interfacing its 5-V outputs to 3.3-V receivers may damage inputs. Use dedicated level shifters when integrating SNJ54F245W into mixed-voltage systems.
What is the meaning of "NRND" status for some SNJ54F245W variants listed in TI documentation?
"NRND" (Not Recommended for New Designs) applies only to obsolete variants like SNJ54F245FK - not to SNJ54F245W itself, which remains Active per TI's 2026 packaging addendum. SNJ54F245W is fully supported for new military/aerospace designs, with active production, tube packaging (25 pcs), and full QML-38535 certification maintained by TI.
How does the CFP (W) package of SNJ54F245W differ electrically from the CDIP (J) version?
Electrically, SNJ54F245W (CFP) and SNJ54F245J (CDIP) are identical - same DC parameters, AC timing, temperature range, and logic behavior. The CFP package offers lower thermal resistance (125°C/W vs. 145°C/W typical), superior high-frequency noise rejection due to ground plane integration, and hermetic sealing - critical for SNJ54F245W use in vacuum or high-humidity operational environments.
SNJ54F245W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54F
- 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:
- 12mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-CFP
SNJ54F245W FAQ
1.How can I place an order for SNJ54F245W through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54F245W 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 SNJ54F245W reliable?
The price and inventory of SNJ54F245W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54F245W is usually 5 days.
3.What payment methods are accepted for SNJ54F245W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54F245W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54F245W?
SNJ54F245W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54F245W 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 SNJ54F245W?
For technical support, including SNJ54F245W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54F245W requirements.
6.How does Aetrix verify that SNJ54F245W is sourced from the original manufacturer or authorized distributors?
All SNJ54F245W 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 SNJ54F245W meets industry standards.
7.What is the process for return or replacement of SNJ54F245W?
All SNJ54F245W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54F245W, 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 SNJ54F245W part is unused and in its original packaging.
Return procedure for SNJ54F245W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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