SN74AVC8T245RHLR: High-Performance Bidirectional Voltage-Level Translation Transceiver IC
SN74AVC8T245RHLR: Texas Instruments' High-Performance Bidirectional Voltage-Level Translation Transceiver
The SN74AVC8T245RHLR from Texas Instruments is an advanced 8-bit bidirectional voltage-level translation transceiver designed to bridge communication gaps between mixed-voltage digital systems. This comprehensive guide explores its features, applications, and why it outperforms competing solutions in industrial, automotive, and IoT applications.
In-Depth Technical Specifications
Core Architecture
- Logic Family: AVC (Advanced Very-Low-Voltage CMOS)
- Direction Control: Dedicated DIR pins for each 8-bit bank
- Data Rate: Supports up to 380 Mbps (3.3V to 1.8V translation)
Voltage Translation Capabilities
| Port A Voltage Range | Port B Voltage Range |
|---|---|
| 1.2V 0.1V | 1.5V 0.1V |
| 1.8V 0.15V | 2.5V 0.2V |
| 3.3V 0.3V | 3.3V 0.3V |
Power Efficiency Features
- 26 A maximum ICC (3.3V supply)
- Partial Power-Down Protection (IOFF circuitry)
- Bus-hold on data inputs eliminates need for external pull-ups
Package Details & Thermal Performance
The 24-pin VQFN (5.5mm 3.5mm) package features:
- 0.5mm pitch for high-density PCB layouts
- Exposed thermal pad with JA of 42.3 C/W
- Moisture Sensitivity Level (MSL): MSL1 (unlimited floor life)
Industry-Leading Applications
1. Industrial Automation Systems
Enables communication between 3.3V PLCs and 1.8V sensor networks with:
- 12kV HBM ESD protection
- Latch-up performance exceeding 100mA
2. Automotive Electronics
Qualified for:
- AEC-Q100 Grade 2 (-40 C to +105 C)
- CAN/LIN bus voltage translation
3. Consumer IoT Devices
Ideal for battery-powered applications due to:
- 1.2V minimum operating voltage
- 500nA maximum standby current
Design Considerations
PCB Layout Guidelines
- Use 0.1 F decoupling capacitors within 2mm of VCC pins
- Route translation channels as 50 controlled impedance
- Thermal vias under exposed pad (minimum 4 array)
Signal Integrity Best Practices
- Add 22 series resistors for >100mm trace lengths
- Maintain <3ns rise/fall times for optimal EMI performance
Competitive Advantages
Compared to similar devices like SN74LVC8T245, the SN74AVC8T245RHLR offers:
| Feature | SN74AVC8T245RHLR | Competitor A |
|---|---|---|
| Voltage Range | 1.2-3.6V | 1.65-5.5V |
| Propagation Delay | 2.3ns max | 5.5ns typ |
| Power Consumption | 50% lower | Higher |
Purchasing & Support Resources
- Available through TI's official store
- Reference designs: TIDA-01542 (Industrial), TIDA-020032 (Automotive)
- SPICE models available in PSpice for TI
Conclusion
The SN74AVC8T245RHLR represents the pinnacle of voltage translation technology, combining Texas Instruments' signature reliability with cutting-edge performance metrics. Its unique combination of wide voltage range, bidirectional capability, and industrial-grade robustness makes it the premier choice for engineers designing next-generation electronic systems across all industries.