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Texas Instruments SNJ54ACT245FK
- Part No.:
- SNJ54ACT245FK
- Manufacturer:
- Texas Instruments
- Package:
- 20-CLCC
- Datasheet:
-
SNJ54ACT245FK.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:4,993
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Product details
Overview
SNJ54ACT245FK 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 factory automation controllers requiring radiation-tolerant signal bridging between 5 V microcontrollers and peripheral buses.
For engineers reviewing the SNJ54ACT245FK datasheet, SNJ54ACT245FK pinout, SNJ54ACT245FK application, or SNJ54ACT245FK equivalent, this page provides verified functional modes, thermal resistance (RθJA = 70 °C/W), absolute maximum ratings, switching characteristics, and precise LCCC-20 package implementation details required for high-reliability board-level integration.
Technical Context
The SNJ54ACT245FK implements dual 8-bit bidirectional data paths controlled by DIR (direction) and OE (output enable) pins, enabling noninverted A↔B data transfer or high-impedance isolation. Its CMOS architecture ensures balanced drive strength (±24 mA per output), overvoltage-tolerant inputs (up to 5.5 V), and slow edge rates to suppress output ringing in noisy industrial environments.
It complies with MIL-PRF-38535 Class V requirements, supports –55°C to +125°C operation, and uses LCCC (FK) ceramic packaging with hermetic sealing and lead-free SNPB terminations - optimized for long-term stability in aerospace avionics and defense subsystems where latch-up immunity and ESD robustness (±3000 V HBM) are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - enables direct compatibility with regulated 5 V supply rails without level-shifting. |
| Max tPD | 8 ns at 5 V - guarantees sub-12.5 MHz sustained data throughput across all 8 channels under worst-case timing. |
| IOL / IOH | ±24 mA - sufficient to drive standard TTL loads or terminate stubbed bus traces without external buffers. |
| VIH / VIL | 2.0 V / 0.8 V - matches TTL logic thresholds, allowing seamless interfacing with legacy 5 V microcontrollers and FPGAs. |
| RθJA | 70 °C/W - measured for FK package; enables thermal design margin of ≥35°C rise at 100 mW dissipation in convection-cooled enclosures. |
| ESD Rating | ±3000 V HBM - exceeds MIL-STD-883 Method 3015.7, supporting handling in non-classified production lines without special ESD controls. |
| Operating Temp | –55°C to +125°C - qualified per MIL-PRF-38535, suitable for engine bay, radar front-end, and satellite payload applications. |
Pinout & Package
LCCC (FK) package: 20-terminal ceramic leadless chip carrier, 0.65 mm pitch, 6.6 mm × 6.4 mm body size, hermetically sealed, SNPB finish, non-RoHS compliant, MSL N/A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | Low = B→A data flow; High = A→B data flow; must be stable before OE activation to avoid bus contention. |
| 2–9 A1–A8 | Port A I/O terminals | Bidirectional data lines tied to local bus; internally clamped to VCC/GND; tolerate 5.5 V inputs regardless of VCC. |
| 10 GND | Ground reference | Primary return path for all I/O and power currents; requires low-inductance connection to system ground plane. |
| 11–18 B8–B1 | Port B I/O terminals | Reversed pin order (B8 to B1) matches physical layout; identical electrical behavior to A-side ports. |
| 19 OE | Output enable input | Active-low; ties all A/B outputs to high-impedance when high; pull-up to VCC recommended for power-up safety. |
| 20 VCC | Power supply | Single 4.5–5.5 V rail; bypass capacitor (0.1 µF ceramic) required within 3 mm for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Accepts up to 5.5 V regardless of VCC value - eliminates need for external level translators when interfacing mixed-voltage subsystems. |
| Slow-edge-rate outputs | Controlled dV/dt minimizes EMI and overshoot on unterminated or long PCB traces - critical for EMC-compliant industrial backplanes. |
| High-impedance isolation mode | OE = High disables both A and B ports simultaneously - prevents leakage current paths during processor reset or sleep states. |
| MIL-PRF-38535 Class V qualification | Full military screening including burn-in, temperature cycling, and lot acceptance testing - ensures reliability in mission-critical deployments. |
| Hermetic LCCC packaging | Ceramic body with solder-sealed lid - provides moisture resistance and mechanical stability under shock/vibration exceeding 100 g peak. |
Applications
| Factory Automation Controller | Avionics Data Bus Bridge |
|---|---|
|
Use Scenario: Isolating and translating signals between a 5 V FPGA-based motion controller and legacy 5 V I/O modules in a PLC rack. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing real-time command/response traffic with deterministic 8 ns latency and no bus contention risk. Use Value: Enables drop-in replacement of obsolete 74F245 while maintaining full timing compliance and eliminating external pull-ups or level shifters. |
Use Scenario: Coupling ARINC 429 transmitter/receiver logic to a radiation-hardened microprocessor in a flight control computer. IC Role / Device Role / Timing Role: Direction-controlled data bridge ensuring signal integrity across partitioned voltage domains under extreme thermal cycling. Use Value: Hermetic LCCC package and –55°C to +125°C operation guarantee uninterrupted function during stratospheric ascent and re-entry thermal transients. |
| Defense Radar Front-End Interface | Satellite Payload Command Decoder |
|
Use Scenario: Interfacing a high-speed ADC/DAC module to a TI C6000 DSP in an active electronically scanned array (AESA) radar subsystem. IC Role / Device Role / Timing Role: Low-noise, low-ringing bus interface preserving analog-to-digital timing margins during high-frequency sampling bursts. Use Value: Slow-edge outputs reduce harmonic content above 100 MHz, easing RF filtering requirements and improving spurious-free dynamic range. |
Use Scenario: Routing telemetry commands from a space-qualified microcontroller to multiple radiation-tolerant sensor nodes on a CubeSat platform. IC Role / Device Role / Timing Role: Radiation-hardened bus coupler providing fault-isolated command distribution with latch-up immunity. Use Value: MIL-PRF-38535 Class V qualification and SNPB finish ensure survivability in total ionizing dose (TID) environments >100 krad(Si). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT245W | CFP-20 package (25-pin tube); RθJA = 58 °C/W; same electrical specs and military qualification. | Preferred for through-hole prototyping or legacy wave-solder assembly; larger footprint but easier manual rework. | Select SNJ54ACT245W when board-level repairability or compatibility with existing CFP tooling is required. |
| SN74ACT245DBR | SSOP-20 commercial-grade part; RoHS-compliant; RθJA = 105.4 °C/W; operating range –40°C to +85°C only. | Valid for industrial-grade surface-mount production where cost and volume matter more than extended temperature or hermeticity. | Choose SN74ACT245DBR for non-military applications needing lower unit cost and standard SMT logistics support. |
Compared with SNJ54ACT245W and SN74ACT245DBR, the SNJ54ACT245FK offers superior thermal performance (70 °C/W vs. 58/105.4), full military temperature range, and hermetic reliability - making it the sole choice for deployed systems where field failure is not acceptable.
Availability
SNJ54ACT245FK is available at Aetrix Electronics and suitable for factory automation controllers, avionics data bus bridges, defense radar front-ends, satellite payload command decoders, and aerospace telemetry interfaces requiring stable component supply across extended product lifecycles.
Supply support for SNJ54ACT245FK 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 over 50 years of heritage in military and space-grade IC development.
The SN54ACT245 family was engineered for deterministic, low-noise bidirectional bus interfacing in mission-critical systems - emphasizing radiation tolerance, wide temperature operation, and robust ESD immunity from inception.
FAQ
What is the maximum operating temperature range for SNJ54ACT245FK?
The SNJ54ACT245FK is rated for –55°C to +125°C operation and qualified per MIL-PRF-38535 Class V, making it suitable for deployment in engine compartments, radar housings, and satellite payloads where ambient extremes exceed commercial-grade limits. This range is validated across all electrical parameters including propagation delay, drive strength, and leakage current.
Does SNJ54ACT245FK require external pull-up resistors on OE or DIR pins?
Yes - TI recommends tying OE to VCC via a pull-up resistor (value determined by driver sink capability) to ensure high-impedance state during power-up or brownout. DIR has no internal bias; it must be actively driven or externally held to a defined logic level to prevent undefined bus direction and potential contention. The SNJ54ACT245FK does not include internal weak pull-ups on either pin.
Can SNJ54ACT245FK interface directly with 3.3 V logic devices?
No - the SNJ54ACT245FK is a 5 V-only device with TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V) and 4.5–5.5 V VCC requirement. While its inputs tolerate up to 5.5 V, they cannot reliably recognize 3.3 V logic highs without external level translation. Direct connection risks marginal VIH detection and violates recommended operating conditions.
What is the thermal resistance (RθJA) of SNJ54ACT245FK, and how is it measured?
The SNJ54ACT245FK has an RθJA of 70 °C/W, measured per JEDEC JESD51-2 for the LCCC (FK) package on a 4-layer test board with 1 in² copper area. This value reflects real-world convection cooling and informs thermal margin calculations - for example, at 100 mW dissipation, junction temperature rise is 7°C above ambient, enabling safe operation even in sealed enclosures at +125°C ambient.
Is SNJ54ACT245FK RoHS-compliant?
No - the SNJ54ACT245FK uses SNPB (tin-lead) terminations and is explicitly non-RoHS compliant, as confirmed in TI's Package Option Addendum. It is intended for military, aerospace, and other exempt applications where leaded finishes are mandated for solder joint reliability and whisker resistance under thermal cycling stress.
SNJ54ACT245FK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54ACT
- Package/Case:
- 20-CLCC
- 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:
- 75mA, 75mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LCCC (8.89x8.89)
SNJ54ACT245FK FAQ
1.How can I place an order for SNJ54ACT245FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ACT245FK 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 SNJ54ACT245FK reliable?
The price and inventory of SNJ54ACT245FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ACT245FK is usually 5 days.
3.What payment methods are accepted for SNJ54ACT245FK?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54ACT245FK?
SNJ54ACT245FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ACT245FK 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 SNJ54ACT245FK?
For technical support, including SNJ54ACT245FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ACT245FK requirements.
6.How does Aetrix verify that SNJ54ACT245FK is sourced from the original manufacturer or authorized distributors?
All SNJ54ACT245FK 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 SNJ54ACT245FK meets industry standards.
7.What is the process for return or replacement of SNJ54ACT245FK?
All SNJ54ACT245FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ACT245FK, 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 SNJ54ACT245FK part is unused and in its original packaging.
Return procedure for SNJ54ACT245FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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