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Texas Instruments SNJ54HC245J
- Part No.:
- SNJ54HC245J
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54HC245J.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SNJ54HC245J 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 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 SNJ54HC245J datasheet, SNJ54HC245J pinout, SNJ54HC245J application, or SNJ54HC245J equivalent, this page provides verified functional modes, validated thermal metrics for CDIP-20, confirmed ESD ratings (±3000 V HBM), and precise timing behavior under MIL-PRF-38535-compliant test conditions.
Technical Context
The SNJ54HC245J 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 drive strength and low input current (≤1 μA), minimizing bus loading during idle states.
Designed for MIL-PRF-38535 compliance, it undergoes full parameter testing across –55°C to +125°C, supports 15 LSTTL loads per output, and features slow edge rates to suppress ringing on long traces - critical for deterministic timing in flight control and radar interface subsystems.
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 - guarantees sub-20 ns cycle time for high-speed bus arbitration |
| Output Drive Strength | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads without external buffers |
| Supply Current (ICC) | 80 μA max - reduces static power in always-on military subsystems |
| ESD Rating (HBM) | ±3000 V - meets MIL-STD-883 requirement for handling survivability in field-deployed hardware |
| Operating Temperature | –55°C to +125°C - qualified for engine bay, radar front-end, and space-qualified avionics enclosures |
| Input Leakage Current | 1 μA max - prevents false triggering on unterminated control lines in low-power standby modes |
Pinout & Package
SNJ54HC245J uses a 20-pin Ceramic Dual In-line Package (CDIP-J) with 0.3-inch body width and through-hole mounting. Pin 10 is GND, Pin 20 is VCC, and all I/O pins are symmetrically arranged for A- and B-side bus routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Logic level determines data flow direction: LOW = B→A, HIGH = A→B |
| 2–9 (A1–A8) | Port A Bidirectional I/O | Connects to source bus; functions as input or output depending on DIR state |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output currents |
| 11–18 (B1–B8) | Port B Bidirectional I/O | Connects to destination bus; mirrors A-port functionality with reversed directionality |
| 19 (OE) | Output Enable Input | Active-LOW control: asserts high-impedance state on all A/B pins when HIGH |
| 20 (VCC) | Power Supply Input | Accepts 2–6 V; requires local 0.1 μF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Supports mixed-voltage system integration without external regulators or translators |
| High-current 3-state outputs | Drives up to 15 LSTTL loads directly - eliminates need for buffer ICs in legacy bus designs |
| Low power consumption | 80 μA max ICC enables battery-backed operation in mission-critical holdover circuits |
| Slow edge rate design | Minimizes output ringing and EMI on long PCB traces common in avionics chassis wiring |
| MIL-PRF-38535 compliance | All parameters fully tested over temperature - required for DoD procurement and flight qualification |
Applications
| Avionics Data Bus Interface | Radar Signal Processing Backplane |
|---|---|
Use Scenario: Isolating sensor acquisition modules from central flight computers via MIL-STD-1553 or ARINC 429 auxiliary buses. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing command/data handshaking between dissimilar voltage domains. Use Value: Enables deterministic 12 ns propagation delay and ±3000 V HBM protection - critical for fault-tolerant communication in fly-by-wire systems. |
Use Scenario: Interfacing ADC/DAC modules to FPGA-based beamforming engines in phased-array radar front ends. IC Role / Device Role / Timing Role: Synchronized bus isolation device preventing signal contention during multi-channel sampling cycles. Use Value: Provides –55°C to +125°C operation and full parameter testing per MIL-PRF-38535 - ensuring reliability under thermal cycling in airborne radar housings. |
| Tactical Vehicle Control Network | Secure Satellite Communication Terminal |
Use Scenario: Bridging CAN-based vehicle subsystems (engine, brakes, comms) to a hardened 32-bit microcontroller running real-time OS. IC Role / Device Role / Timing Role: Direction-controlled bus coupler enabling time-triggered message forwarding with minimal latency jitter. Use Value: Delivers ±6 mA drive at 5 V and 80 μA quiescent current - sustaining CAN node interoperability while minimizing power draw in mobile platforms. |
Use Scenario: Level-shifting between radiation-hardened memory controllers and encryption ASICs in LEO satellite payload bays. IC Role / Device Role / Timing Role: High-impedance isolation gate activated by secure boot firmware to prevent side-channel leakage during key exchange. Use Value: Guarantees 100% tested parametric performance across military temperature range - meeting ECSS-Q-ST-60C radiation tolerance prerequisites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC245N | Commercial-grade (–40°C to +85°C), RoHS-compliant PDIP-20; no MIL-PRF-38535 testing | Suitable for non-military industrial control, not qualified for aerospace or defense deployment | Select only for cost-sensitive terrestrial applications where extended temperature and full parameter testing are unnecessary |
| SNJ54LS245J | Bipolar TTL technology; higher ICC (40 mA), faster tpd (10 ns), but incompatible VCC range (4.75–5.25 V only) | Used in legacy 5 V-only systems requiring TTL-level noise immunity, not CMOS-compatible voltage scaling | Choose only when interfacing with vintage TTL buses and when power budget allows 50× higher static current |
Compared with SN74HC245N and SNJ54LS245J, SNJ54HC245J uniquely combines military temperature range, full MIL-PRF-38535 test coverage, and CMOS low-power operation - making it irreplaceable in safety-critical embedded systems where parameter assurance and environmental resilience are mandatory.
Availability
SNJ54HC245J is available at Aetrix Electronics and suitable for avionics data bus interface, radar signal processing backplane, tactical vehicle control network, and secure satellite communication terminal applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54HC245J 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 industrial, automotive, and aerospace markets.
The SNJ54HC245J belongs to TI's military logic family, engineered specifically for ruggedized digital interface applications demanding guaranteed performance under extreme thermal, mechanical, and electrical stress conditions.
FAQ
What is the operating temperature range of the SNJ54HC245J?
The SNJ54HC245J is rated for operation from –55°C to +125°C and is fully tested across this range per MIL-PRF-38535 requirements. This makes SNJ54HC245J suitable for deployment in engine compartments, radar front ends, and space-constrained avionics enclosures where ambient temperatures exceed commercial-grade limits.
Does the SNJ54HC245J require external pull-up resistors on OE or DIR?
TI recommends tying OE to VCC via a pull-up resistor during power-up/down to ensure high-impedance state; SNJ54HC245J does not integrate internal pull-ups. DIR may float only if externally controlled - floating DIR causes undefined directionality and potential bus contention. The SNJ54HC245J datasheet specifies minimum pull-up strength based on driver sink capability.
How does the SNJ54HC245J differ from the commercial SN74HC245 series?
The SNJ54HC245J differs from SN74HC245 in three key ways: it uses ceramic DIP packaging (J) instead of plastic, operates across –55°C to +125°C versus –40°C to +85°C, and undergoes full parameter testing per MIL-PRF-38535 - whereas SN74HC245 receives sample testing only. SNJ54HC245J also carries non-RoHS leaded finish.
Can the SNJ54HC245J drive 15 LSTTL loads directly?
Yes - the SNJ54HC245J delivers ±6 mA output drive at 5 V, which meets the LSTTL load requirement of 0.4 mA per input. With eight channels, SNJ54HC245J can simultaneously drive up to 15 LSTTL inputs without external buffering, as confirmed in TI's official characterization data and application note SCLA015.
What is the maximum clock frequency supported by the SNJ54HC245J?
The SNJ54HC245J does not operate on a clock; it is an asynchronous transceiver. Its usable data rate depends on propagation delay and system setup/hold timing. With typical tpd = 12 ns (VCC = 6 V, CL = 50 pF), SNJ54HC245J supports reliable bus handshaking up to ~40 MHz in well-terminated systems - verified in TI's switching characteristics tables and application schematics.
SNJ54HC245J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54HC245J FAQ
1.How can I place an order for SNJ54HC245J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54HC245J 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 SNJ54HC245J reliable?
The price and inventory of SNJ54HC245J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54HC245J is usually 5 days.
3.What payment methods are accepted for SNJ54HC245J?
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4.How is shipping managed for SNJ54HC245J?
SNJ54HC245J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54HC245J 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 SNJ54HC245J?
For technical support, including SNJ54HC245J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54HC245J requirements.
6.How does Aetrix verify that SNJ54HC245J is sourced from the original manufacturer or authorized distributors?
All SNJ54HC245J 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 SNJ54HC245J meets industry standards.
7.What is the process for return or replacement of SNJ54HC245J?
All SNJ54HC245J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54HC245J, 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 SNJ54HC245J part is unused and in its original packaging.
Return procedure for SNJ54HC245J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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