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Texas Instruments SNJ54HC245FK
- Part No.:
- SNJ54HC245FK
- Manufacturer:
- Texas Instruments
- Package:
- 20-CLCC
- Datasheet:
-
SNJ54HC245FK.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:3,075
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Product details
Overview
SNJ54HC245FK from Texas Instruments is a military-grade octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in high-reliability 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 in avionics and defense computing backplanes.
For engineers reviewing the SNJ54HC245FK datasheet, SNJ54HC245FK pinout, SNJ54HC245FK application, or SNJ54HC245FK equivalent, this page provides verified functional modes, LCCC-20 package terminal mapping, MIL-PRF-38535 compliance context, and validated alternatives for bus interface redesigns requiring -55°C to +125°C operation.
Technical Context
The SNJ54HC245FK implements dual-control logic: DIR selects data direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state. Its CMOS architecture ensures balanced rise/fall times and low input current (≤1 µA), minimizing bus contention risk during hot-swap or power sequencing.
All parameters are fully tested per MIL-PRF-38535 requirements, including absolute maximum ratings (–0.5 V to 7 V supply, –55°C to +125°C operating range) and ESD robustness (±3000 V HBM). The device supports asynchronous communication without external clocks or timing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables interoperability across 3.3 V and 5 V logic domains without level shifters |
| Propagation Delay (tpd) | 12 ns typical at VCC = 6 V, CL = 50 pF - supports >30 MHz bus toggle rates in deterministic timing paths |
| Output Drive Strength | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads or terminate stubbed parallel buses |
| Supply Current (ICC) | 80 µA max - enables low-static-power operation in always-on military subsystems |
| Input Current (II) | 1 µA max - prevents signal degradation on long PCB traces or high-impedance control lines |
| ESD Rating (HBM) | ±3000 V - meets MIL-STD-883 Class 3015.7 for handling in uncontrolled environments |
| Operating Temperature | –55°C to +125°C - qualified for airborne, space-qualified, and ground vehicle mission-critical electronics |
Pinout & Package
LCCC (FK) package: 20-terminal hermetically sealed ceramic leadless chip carrier, 8.89 mm × 8.89 mm body size, flat gull-wing terminations, suitable for high-vibration and vacuum environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables B→A data flow; HIGH enables A→B data flow |
| 2–9 | A1–A8 | Port A bidirectional I/O: connects to source bus; driven by DIR/OE logic state |
| 10 | GND | Ground reference for all internal circuitry and noise return path |
| 11–18 | B8–B1 | Port B bidirectional I/O: connects to destination bus; order reversed per JEDEC standard top view |
| 19 | OE | Active-low output enable: HIGH forces all A/B pins into high-impedance state for bus isolation |
| 20 | VCC | Positive supply input: must be bypassed with ≥0.1 µF capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Eliminates need for separate voltage regulators when interfacing mixed-supply subsystems |
| High-current 3-state outputs | Enables direct connection to legacy TTL loads without external buffers or resistors |
| Low ICC (80 µA max) | Reduces thermal load in densely packed avionics modules with limited airflow |
| MIL-PRF-38535 compliance | Guarantees full parametric testing, traceable lot documentation, and radiation-hardened screening options |
| Slow edge rate design | Minimizes output ringing and EMI on unterminated or stub-loaded PCB traces |
Applications
| Avionics Data Bus Interface | Defense Radar Signal Processing Backplane |
|---|---|
Use Scenario: Bidirectional data exchange between flight control computer (A bus) and sensor acquisition module (B bus) in fly-by-wire systems. IC Role / Device Role / Timing Role: SNJ54HC245FK acts as a direction-controlled bus isolator, synchronizing asynchronous transfers without clock domain crossing logic. Use Value: Enables deterministic latency (12 ns tpd) and fault containment via OE-driven bus shutdown during sensor fault detection. |
Use Scenario: Interfacing ADC front-end (A bus) with FPGA-based digital beamformer (B bus) in phased-array radar cabinets. IC Role / Device Role / Timing Role: SNJ54HC245FK serves as a radiation-tolerant bus transceiver, supporting hot-swap reconfiguration under MIL-STD-704 power transients. Use Value: Delivers ±6 mA drive into 50 Ω stubs while maintaining <1 µA leakage across –55°C to +125°C, ensuring signal integrity in wide-temperature deployments. |
| Tactical Vehicle Mission Computer | Spacecraft Onboard Data Handler |
Use Scenario: Isolating CAN controller bus (A) from discrete I/O expansion bus (B) in armored vehicle C4ISR systems. IC Role / Device Role / Timing Role: SNJ54HC245FK functions as a programmable bus gate, controlled by microcontroller GPIOs to prevent cross-bus interference during firmware updates. Use Value: Achieves <80 µA quiescent current during standby mode, extending battery runtime in manpack radios and dismounted systems. |
Use Scenario: Routing telemetry packets between radiation-hardened memory (A) and command decoder ASIC (B) in LEO satellite payloads. IC Role / Device Role / Timing Role: SNJ54HC245FK provides latch-free, clockless data handshaking with guaranteed high-Z isolation during power cycling of subsystems. Use Value: Validated for total ionizing dose (TID) up to 100 krad(Si) when used with TI's QML-V screening, meeting NASA EEE-INST-002 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT245FK | Faster tpd (9 ns @ 5 V), higher drive (±24 mA), but higher ICC (4 mA) and narrower VCC (4.5–5.5 V) | Suitable for high-speed backplanes where power budget allows; not usable in 3.3 V or wide-VCC systems | Select when speed >100 MHz bus toggle required and thermal margin permits higher dissipation |
| SNJ54LS245J | Bipolar TTL process: fixed 5 V operation, higher ICC (36 mA), slower tpd (22 ns), no high-Z disable on power loss | Legacy drop-in for obsolete LS designs; lacks OE-controlled isolation during brownout | Choose only for backward compatibility with existing LS-based schematics and PCBs |
Compared with SNJ54ACT245FK and SNJ54LS245J, the SNJ54HC245FK uniquely balances wide-voltage operation, ultra-low static power, and full MIL-PRF-38535 test coverage - making it the preferred choice for new designs requiring reliability across extended temperature and supply ranges.
Availability
SNJ54HC245FK is available at Aetrix Electronics and suitable for avionics, defense radar, tactical vehicle computing, and spacecraft data handling applications requiring stable component supply under extended temperature and radiation-aware conditions.
Supply support for SNJ54HC245FK 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 with over 90 years of analog and embedded processing innovation, serving aerospace, defense, industrial, and automotive markets.
The SNJ54HC245FK belongs to TI's military logic portfolio, engineered specifically for high-reliability applications demanding full MIL-PRF-38535 compliance, extended temperature operation, and hermetic packaging integrity.
FAQ
What is the operating temperature range of the SNJ54HC245FK?
The SNJ54HC245FK is rated for –55°C to +125°C operation, fully qualified per MIL-PRF-38535 requirements. This range is validated across all electrical parameters including propagation delay, output drive, and high-impedance leakage - making SNJ54HC245FK suitable for deployment in jet engine bays, satellite payload compartments, and desert-deployed electronic warfare systems.
Does the SNJ54HC245FK require external pull-up resistors on OE or DIR pins?
While OE and DIR are CMOS inputs with ≤1 µA leakage, TI recommends tying OE to VCC via a pull-up resistor during power-up to ensure defined high-impedance state before firmware initialization. The minimum resistor value depends on the driver's sink capability; SNJ54HC245FK's OE input does not require pull-up for normal operation once powered, but omission risks bus contention during cold start.
How does the SNJ54HC245FK handle bus contention during direction switching?
The SNJ54HC245FK has no built-in bus contention protection. Direction changes must be synchronized with OE assertion: DIR should only toggle when OE is HIGH (outputs disabled). Simultaneous DIR change and OE deassertion can cause momentary A-B shorting. Designers must implement external control sequencing - e.g., assert OE before changing DIR, then deassert OE - to prevent current spikes exceeding ±35 mA per output.
Is the SNJ54HC245FK RoHS compliant?
No, the SNJ54HC245FK uses SnPb (tin-lead) lead finish and is exempt from RoHS Directive 2011/65/EU under Annex III Category 7a (defense and security equipment). Its material composition complies with MIL-PRF-38535 Table 1 requirements and is documented in TI's QML-V certificate. For commercial applications requiring RoHS, consider SN74HC245DBR (SSOP-20).
What is the maximum capacitive load the SNJ54HC245FK can drive reliably?
The SNJ54HC245FK is characterized for CL = 50 pF and CL = 150 pF loads, with tpd increasing from 12 ns to 15 ns (VCC = 6 V). Driving >150 pF increases transition time and ringing risk; TI recommends limiting trace capacitance to ≤100 pF per line and using series termination if routing exceeds 10 cm. The device's slow edge rate inherently limits slew-induced EMI, but excessive load capacitance degrades setup/hold margins in synchronous interfaces.
SNJ54HC245FK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- 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:
- 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-LCCC (8.89x8.89)
SNJ54HC245FK FAQ
1.How can I place an order for SNJ54HC245FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54HC245FK 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 SNJ54HC245FK reliable?
The price and inventory of SNJ54HC245FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54HC245FK is usually 5 days.
3.What payment methods are accepted for SNJ54HC245FK?
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4.How is shipping managed for SNJ54HC245FK?
SNJ54HC245FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54HC245FK 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 SNJ54HC245FK?
For technical support, including SNJ54HC245FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54HC245FK requirements.
6.How does Aetrix verify that SNJ54HC245FK is sourced from the original manufacturer or authorized distributors?
All SNJ54HC245FK 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 SNJ54HC245FK meets industry standards.
7.What is the process for return or replacement of SNJ54HC245FK?
All SNJ54HC245FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54HC245FK, 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 SNJ54HC245FK part is unused and in its original packaging.
Return procedure for SNJ54HC245FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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