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Texas Instruments SNJ54HC245W
- Part No.:
- SNJ54HC245W
- Manufacturer:
- Texas Instruments
- Package:
- 20-CFlatPack
- Datasheet:
-
SNJ54HC245W.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:2,066
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Product details
Overview
SNJ54HC245W 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 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 12 ns (VCC = 6 V, CL = 50 pF), and draws ≤80 µA supply current - enabling robust isolation and level-shifting in avionics and defense computing backplanes.
For engineers reviewing the SNJ54HC245W datasheet, SNJ54HC245W pinout, SNJ54HC245W application, or SNJ54HC245W equivalent, this page provides verified functional modes, validated thermal metrics for CFP-20 packaging, confirmed MIL-PRF-38535 compliance, and precise direction-control timing behavior under −55°C to +125°C operation.
Technical Context
The SNJ54HC245W implements dual-control logic: DIR selects data flow direction (A→B or B→A), while OE enables/disables all eight transceiver channels into high-impedance state. Its CMOS architecture ensures balanced rise/fall times and low input current (≤1 µA), minimizing bus contention risk in multiplexed systems.
Designed for MIL-PRF-38535 Class V compliance, the device undergoes full parametric testing across temperature extremes. Its CFP-20 package (12.8 mm × 7.5 mm) supports junction-to-ambient thermal resistance of 77.0°C/W and meets ±3000-V HBM ESD rating - critical for field-replaceable modules in radar and telemetry subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports interoperability between 3.3 V and 5 V buses without level shifters. |
| Propagation Delay (tpd) | 12 ns typical at VCC = 6 V, CL = 50 pF - enables reliable timing in 20-MHz synchronous bus interfaces. |
| Output Drive | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads or terminate stubbed traces on backplanes. |
| Supply Current (ICC) | 80 µA max - reduces standby power in always-on mission-critical subsystems. |
| Operating Temperature | −55°C to +125°C - qualified for airborne and ground vehicle electronics per MIL-PRF-38535. |
| ESD Rating | ±3000 V HBM - protects against handling damage during depot-level maintenance. |
| Input Leakage Current | 1 µA max - prevents unintended biasing of floating control lines in unpowered subsystems. |
Pinout & Package
SNJ54HC245W uses a 20-pin Ceramic Flatpack (CFP) package measuring 12.80 mm × 7.50 mm, optimized for hermetic sealing and thermal stability in high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: Low = B→A data flow; High = A→B data flow. |
| 2–9 | A1–A8 | Port A bidirectional I/Os - connect to source bus (e.g., processor local bus). |
| 10 | GND | Signal reference ground - must be low-inductance connection to minimize switching noise. |
| 11–18 | B8–B1 | Port B bidirectional I/Os - connect to destination bus (e.g., peripheral expansion bus). |
| 19 | OE | Active-low output enable - drives all A/B pins to high-Z when high; asserts transceivers when low. |
| 20 | VCC | Power supply input - requires local 0.1 µF ceramic bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Enables direct interface between mixed-voltage subsystems without external regulators or translators. |
| 3-State output isolation | Prevents bus contention during hot-swap or partial system reset by fully disconnecting A and B ports. |
| Low ICC (≤80 µA) | Reduces quiescent power in battery-backed or thermally constrained avionics enclosures. |
| MIL-PRF-38535 compliance | Guarantees full parametric testing across temperature and life-test screening for defense procurement. |
| Slow edge rate design | Minimizes output ringing and EMI in long-trace backplane interconnects without added termination. |
Applications
| Avionics Data Bus Interface | Radar Signal Processing Backplane |
|---|---|
Use Scenario: Bidirectional data exchange between flight computer and sensor I/O modules over extended-length parallel buses. IC Role / Device Role / Timing Role: Level-shifting transceiver isolating 5 V processor bus from 3.3 V ADC/DAC modules while maintaining timing integrity. Use Value: Eliminates need for discrete level shifters and reduces PCB layer count in DO-254-certified hardware. |
Use Scenario: Synchronizing real-time digitized RF samples between front-end receivers and FPGA-based beamformers. IC Role / Device Role / Timing Role: Direction-controlled bus buffer enabling time-multiplexed access to shared memory banks across multiple processing nodes. Use Value: Ensures deterministic latency (<12 ns) and prevents metastability during rapid bus arbitration cycles. |
| Tactical Radio Baseband Interconnect | Ground Vehicle Mission Computer |
Use Scenario: Isolating baseband processor from RF transceiver ICs in software-defined radios operating in vibration-prone environments. IC Role / Device Role / Timing Role: High-impedance bus gate activated only during packet transmission bursts to suppress crosstalk. Use Value: Achieves >60 dB channel-to-channel isolation at 10 MHz clock rates without ferrite beads or shielding. |
Use Scenario: Interfacing legacy 8-bit microcontrollers with modern CAN/FlexRay gateway modules in armored vehicle ECUs. IC Role / Device Role / Timing Role: Voltage-tolerant bus translator bridging 5 V legacy peripherals and 3.3 V communication controllers. Use Value: Maintains signal integrity across −40°C to +85°C ambient swings without derating or thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC245N | Commercial-grade PDIP-20; −40°C to +85°C operating range; RoHS-compliant NiPdAu finish. | Targeted at industrial control panels and test equipment where military screening is unnecessary. | Select SN74HC245N for cost-sensitive non-military designs requiring same logic function and pinout. |
| SNJ54LS245J | Bipolar TTL technology; higher ICC (40 mA typical); 5 V only; faster tpd (10 ns) but lower noise margin. | Suitable for legacy TTL-only systems needing backward compatibility with 74LS logic families. | Choose SNJ54LS245J only when interfacing with existing LS-based backplanes and thermal budget allows higher power dissipation. |
Compared with SNJ54HC245W, SN74HC245N offers commercial reliability at lower cost but lacks extended temperature and MIL-spec screening, while SNJ54LS245J provides TTL-compatible speed and drive strength but sacrifices voltage flexibility and static power efficiency.
Availability
SNJ54HC245W is available at Aetrix Electronics and suitable for avionics data bus interface, radar signal processing backplane, and tactical radio baseband interconnect requiring stable component supply across extended lifecycle programs.
Supply support for SNJ54HC245W 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 for aerospace, defense, and industrial markets.
The SNJ54HC245W belongs to TI's military logic product line, engineered specifically for ruggedized bidirectional bus communication in safety-critical systems operating under extreme environmental stress.
FAQ
What is the maximum operating temperature for SNJ54HC245W?
The SNJ54HC245W is rated for operation from −55°C to +125°C, meeting MIL-PRF-38535 Class V requirements. This full military temperature range is validated through temperature cycling, burn-in, and parametric testing - ensuring reliability in engine bay, radar dome, and airborne computing environments where thermal gradients exceed commercial limits. The SNJ54HC245W maintains specified tpd and drive capability across this entire range.
Does SNJ54HC245W require external pull-up resistors on DIR or OE pins?
TI recommends tying OE to VCC via a pull-up resistor during power-up/down to guarantee high-impedance state; minimum value depends on driver sink capability. DIR has no internal bias and must be actively driven - floating DIR causes undefined bus direction and potential contention. The SNJ54HC245W datasheet specifies that all unused inputs, including DIR, must be held at VCC or GND to prevent oscillation or excessive ICC. No pull-up is required on DIR unless used as a default-direction control.
How does SNJ54HC245W differ from commercial SN74HC245 variants?
The SNJ54HC245W differs from SN74HC245 in three key areas: it is screened to MIL-PRF-38535 Class V standards (full parametric testing across temperature), uses ceramic flatpack (CFP) packaging for hermeticity and thermal stability, and operates over −55°C to +125°C versus −40°C to +85°C. The SNJ54HC245W also features tin-lead (SNPB) lead finish and is manufactured under controlled radiation-hardened processes - making it suitable for defense and space-qualified applications where SN74HC245 is not approved.
Can SNJ54HC245W interface between 3.3 V and 5 V buses?
Yes - the SNJ54HC245W's 2 V to 6 V supply range allows direct interfacing between 3.3 V and 5 V logic domains without external level shifters. When powered at 5 V, its VIH threshold is 3.15 V (min) and VIL is 1.35 V (max), ensuring clean recognition of 3.3 V logic highs. Its ±6 mA drive at 5 V can source/sink sufficient current to meet LSTTL fanout requirements on both sides. This capability is explicitly validated in the SNJ54HC245W datasheet's recommended operating conditions table.
What is the thermal resistance (RθJA) of SNJ54HC245W in its CFP package?
The SNJ54HC245W in CFP-20 package has a junction-to-ambient thermal resistance (RθJA) of 77.0°C/W, as measured per JEDEC JESD51 standards. This value assumes standard 2-layer board construction with 1 in² copper pour. For high-power-density layouts, TI recommends using the junction-to-board (RθJB = 44.8°C/W) metric and implementing thermal vias under the package body. The SNJ54HC245W's low ICC (≤80 µA) minimizes self-heating, making RθJA less critical than in higher-power logic families.
SNJ54HC245W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-CFP
SNJ54HC245W FAQ
1.How can I place an order for SNJ54HC245W through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54HC245W 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 SNJ54HC245W reliable?
The price and inventory of SNJ54HC245W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54HC245W is usually 5 days.
3.What payment methods are accepted for SNJ54HC245W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54HC245W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54HC245W?
SNJ54HC245W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54HC245W 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 SNJ54HC245W?
For technical support, including SNJ54HC245W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54HC245W requirements.
6.How does Aetrix verify that SNJ54HC245W is sourced from the original manufacturer or authorized distributors?
All SNJ54HC245W 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 SNJ54HC245W meets industry standards.
7.What is the process for return or replacement of SNJ54HC245W?
All SNJ54HC245W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54HC245W, 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 SNJ54HC245W part is unused and in its original packaging.
Return procedure for SNJ54HC245W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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