STMicroelectronics ST4E1651 Half-Duplex RS485 Transceiver
STMicroelectronics ST4E1651 Half-Duplex RS485 Transceiver is a low-power, differential line transceiver designed for reliable data communication in industrial networks. The transceiver operates from a 3V to 3.6V supply, supports data rates up to 50Mbps, and allows more than 64 transceivers on a single bus, making the device ideal for multi-point applications over extended cable runs.
The device integrates fail-safe receiver functionality, hot-swap capability, thermal shutdown protection, and robust ESD protection up to ±16kV IEC 61000-4-2 contact discharge. These features help ensure stable communication in factory automation, robotics, motion control, building automation, grid infrastructure, and video surveillance systems. The STMicroelectronics ST4E1651 operates across a -40°C to +125°C temperature range and is available in a compact SO8 package.
Features
- Meets or exceeds the requirements of the TIA/EIA-485A standard
- Half-duplex topology
- 3V to 3.6V supply voltage
- High speed - up to 50Mbps data rate
- More than 64 transceivers on the bus
- -40°C to +125°C operating temperature range
- Available in industry-standard SO8 4.90mm x 3.91mm package
- Integrated protections
- Fail-safe receiver (bus open, idle, and shorted)
- Thermal shutdown protection
- Bus I/O ESD protection
- ±16kV IEC61000-4-2 contact discharge
- ±30kV Human Body Model (HBM)
- ±4kV IEC61000-4-4 fast transient burst
Applications
- Factory automation and control
- Encoders
- Building automation and safety
- Video surveillance (building, traffic monitoring)
- Backplane bus
- Grid infrastructure
- Robotics
- Motion controllers
Specifications
- 3V to 3.6V device operating supply voltage range
- -7V to 12V input level range at any bus terminal (separated or common-mode)
- -7V to 12V differential input voltage
- ±70mA operating output current (driver Y, Z)
- 60Ω typical differential load resistance, 54Ω minimum
- 50pF typical differential load capacitance
- 50Mbps maximum signaling rate
- 130mW to 131mW power dissipation range with driver and receiver enabled
- 55°C/W typical junction-to-ambient thermal resistance
Block Diagram
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