STMicroelectronics ST4E1650F Full-Duplex RS485 Transceivers
STMicroelectronics ST4E1650F Full-Duplex RS485 Transceivers are low-power differential line transceivers designed for high-speed RS485 communication in demanding industrial environments. Operating at data rates up to 50Mbps, the device supports full-duplex communication and one-quarter-unit load operation, allowing up to 128 nodes on a single bus. The wide -40°C to +125°C operating temperature range makes the transceivers suitable for industrial automation, robotics, motion control, building automation, and grid infrastructure applications.
The devices integrate multiple protection features to enhance reliability and system robustness. An integrated fail-safe receiver ensures a logic-high output when the bus is open, idle, or shorted. At the same time, hot-swap capability minimizes bus disturbances during power-up, power-down, or live insertion. The STMicroelectronics ST4E1650F also provides IEC 61000-4-2 ESD protection up to ±16kV, ±30kV HBM protection, and high receiver hysteresis for improved noise immunity and signal integrity. Low power consumption, thermal shutdown protection, and compact package options make these transceivers a reliable solution for modern industrial communication networks.
Features
- Meets or exceeds the requirements of the TIA/EIA-485A standard
- 3V to 3.6V supply voltage range
- High speed - up to 50Mbps data rate
- Up to 128 bus nodes
- 70mV receiver hysteresis
- Full-duplex topology
- Low quiescent current in shutdown mode
- -40°C to +125°C operating temperature range
- Available in a small 3mm x 3mm DFN10 or standard SO14 packages
- Integrated protections
- Fail-safe receiver (bus open, idle, and shorted)
- Thermal shutdown protection
- Hot swap capability
- Bus I/O ESD protection
- ±16kV IEC61000-4-2 contact discharge
- ±30kV Human Body Model (HBM)
- ±4kV IEC61000-4-4 fast transient burst
Applications
- Motion controllers
- Optical networks
- Building automation and safety
- Video surveillance (building, traffic monitoring)
- Backplane bus
- Grid infrastructure
- Robotics
Specifications
- 3V to 3.6V device operating supply voltage range
- -7V to 12V input level range at any bus terminal (separated or common-mode)
- ±70mA operating output current (driver Y, Z)
- 60Ω typical differential load resistance, 54Ω minimum
- 50pF typical differential load capacitance
- 50Mbps maximum signaling rate
- 161mW to 163mW power dissipation range with driver and receiver enabled
- Typical thermal resistance
- 55°C/W junction-to-ambient, EP connected to ground and use of thermal vias
- 105°C/W junction-to-ambient on a single-layer PCB
Block Diagram
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