LTC1531CSW#TR

Overview

The LTC1531CSW#TR is a self-powered isolated dual differential comparator housed in a 28-lead SO package. It provides 2500V RMS isolation across an internal capacitive barrier, transmitting both power and data without an isolated supply. The device features a 2.5V isolated reference output with a maximum load of 5mA. Electrical characteristics include a typical supply current of 14mA, a sample rate of 300Hz under no-load conditions, and an input impedance ranging from 18MΩ to 300MΩ. The zero-cross offset is typically ±30mV, and the part operates within a temperature range of 0°C to 70°C.

Feature Summary

• Self-powered operation across the isolation barrier using capacitive coupling for simultaneous power and data transmission.
• Dual differential comparator inputs allowing flexible configuration for single-ended or differential voltage comparisons.
• Integrated zero-cross detection output designed for triggering external triacs in AC line applications.
• High common-mode noise immunity achieved through differential data transfer across the isolation barrier.

Applications

• Isolated thermistor temperature controllers
• Remote light-controlled switches
• Isolated battery cell monitors
• AC line overcurrent detection circuits

Procurement Notes

Verify the specific suffix TRPBF against the datasheet documentation to confirm tape and reel packaging requirements. Ensure the component matches the Analog Devices manufacturer identification. Confirm that the 28-lead SO package dimensions align with the target PCB layout constraints before finalizing procurement.

Selection Notes

Select this component when high-voltage isolation is required without separate isolated power supplies. The self-powered architecture simplifies design by eliminating auxiliary isolated regulators. Consider the 300Hz sample rate and 2.5V reference capability when designing sensor interfaces or control loops requiring galvanic separation.

Part Context

This part belongs to the LTC1531 family of isolated comparators manufactured by Analog Devices. It utilizes a switched-capacitor technique to bridge the isolation gap. The device is distinct from standard digital isolators as it combines sensing, comparison, and power delivery in a single integrated circuit solution.

Replacement Considerations

Consult the official datasheet for potential alternate sources or obsolete product guidance. No specific substitute part numbers are confirmed in the provided documentation.