LTC1531CSW#PBF

Overview

The LTC1531CSW#PBF is a self-powered isolated dual differential comparator housed in a 28-lead plastic SO package. It provides 2500V RMS isolation across an internal capacitive barrier, transmitting both power and data without an external isolated supply. The device features a 2.5V isolated regulated output capable of sourcing up to 5mA for external sensor circuits. Key electrical parameters include a typical sample rate of 300Hz under light loading, a maximum continuous dV/dt rejection of 50V/μs, and an operating temperature range from 0°C to 70°C.

Feature Summary

• Self-powered operation across the isolation barrier using internal capacitive coupling eliminates the need for secondary isolated supplies.
• Dual differential input architecture allows comparison of two differential voltages or single-ended signals with high common-mode noise immunity.
• Integrated zero-cross comparator generates pulsed outputs suitable for triggering triacs in AC line control applications.

Applications

• Isolated thermistor temperature controllers
• Remote light-controlled switches
• Isolated battery cell monitors

Procurement Notes

Verify component authenticity through authorized Analog Devices channels. Confirm that the specific ordering suffix matches the required package and temperature grade. Review the official datasheet for absolute maximum ratings and handling precautions. Ensure compliance with relevant safety standards regarding isolation voltage requirements.

Selection Notes

Select this component when galvanic isolation is required between low-voltage logic and high-voltage AC lines. Consider the 2500V RMS isolation rating and the self-powered nature for simplified circuit design. Evaluate the 300Hz sample rate against application timing needs. Verify that the 2.5V isolated reference current capability meets the load requirements of connected sensors.

Part Context

This part belongs to the LTC1531 family of isolated comparators manufactured by Analog Devices. It utilizes switched-capacitor technology to transfer energy and data across the isolation barrier. The device is designed for applications requiring robust isolation in industrial and consumer electronics environments.

Replacement Considerations

Consult the manufacturer's documentation for potential alternate sources as the product may be obsolete. Verify pin compatibility and isolation specifications before substituting with other isolated comparator models.