LTC2865HMSE Integrated Circuit Chip Fault Protected RS485 RS422 Transceiver IC, 12-Lead MSOP

The LTC2865HMSE is a low power RS485/RS422 transceiver that operates from a 3V to 5.5V supply and survives ±60V overvoltage faults on the data transmission lines in all modes of operation, including power-down. That protection removes the external crowbar and fuse networks usually needed where a field cable can be shorted to a 24V or 48V rail.

The part is full duplex with independent driver and receiver enables, and it transmits at 20Mbps or, in a logic-selectable low EMI mode, at 250kbps with slew rate limited outputs that keep radiated emissions down on long unshielded cable.

Receiver common mode range is extended to ±25V and guaranteed, with fully balanced differential thresholds so duty cycle distortion stays low, and a fail-safe receiver that holds a defined output when the bus is idle, shorted or floating. High input impedance allows up to 256 nodes on one bus.

A separate logic supply pin (VL) accepts 1.65V to 5.5V, so the transceiver can interface directly to low voltage microcontrollers without level shifters. Interface pins withstand ±15kV HBM ESD and all other pins ±8kV, drivers are current limited with thermal shutdown, and the device is pin compatible with the LT1785 and LT1791.

The LTC2865HMSE is supplied in a 12-Lead MSOP with exposed pad package and is specified over -40°C to 125°C (H grade). Every order ships as new stock with full traceability, RoHS compliant and lead free, and samples plus volume pricing are available on request.

• ±60V overvoltage line fault protection in all modes including power-down
• 3V to 5.5V supply voltage
• 20Mbps or low EMI 250kbps data rate, logic selectable
• ±15kV ESD on interface pins, ±8kV on all other pins
• Extended ±25V common mode range, guaranteed
• Fail-safe receiver operation
• High input impedance supports 256 nodes
• 1.65V to 5.5V logic supply pin for flexible digital interface
• Fully balanced differential receiver thresholds
• Current limited drivers and thermal shutdown
• Pin compatible with LT1785 and LT1791
• 12-Lead MSOP with exposed pad package

• SCADA and remote telemetry systems
• Industrial control and instrumentation networks
• Automotive and transportation electronics
• Building automation, security systems and HVAC
• Medical equipment
• Lighting and sound system control

The LTC2865HMSE combines ±60V fault protection, ±25V common mode range and a low voltage logic supply in a 12-Lead MSOP with exposed pad package, which suits RS485 ports exposed to field wiring faults.

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We also carry the related parts shown below, so mixed bills of material can ship together from a single supplier.