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Product Detailed Parameters
- Description：IC COMPARATOR 2 GEN PUR 28SOIC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Type：General Purpose
- Number of Elements：2
- Output Type：-
- Voltage - Supply, Single/Dual (±)：-
- Voltage - Input Offset (Max)：-
- Current - Input Bias (Max)：-
- Current - Output (Typ)：5mA
- Current - Quiescent (Max)：14mA
- CMRR, PSRR (Typ)：-
- Propagation Delay (Max)：-
- Hysteresis：-
- Operating Temperature：0°C ~ 70°C
- Package / Case：28-SOIC (0.295", 7.50mm Width)
- Mounting Type：Surface Mount
- Supplier Device Package：28-SOIC
- Grade：-
- Qualification：-
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Overview
The LTC1531CSW#TRPBF is a self-powered isolated dual differential comparator manufactured by Analog Devices Inc. It features an internal capacitive isolation barrier providing 2500V RMS isolation between the comparator and its output, eliminating the need for an isolated supply as both power and data are transmitted across the barrier. The device includes a 2.5V isolated reference output capable of sourcing up to 5mA, a zero-cross output for line power control, and high input impedance. It operates with a typical supply current of 14 mA and is housed in a 28-lead SO package.
Feature Summary
- Self-powered operation across the isolation barrier using internal capacitive coupling
- Dual differential comparator inputs allowing comparison of two differential or single-ended voltages
- Integrated 2.5V regulated isolated reference output for powering external sensor circuits
- Zero-cross comparator output designed for triggering external triacs
Applications
- Isolated thermistor temperature controllers
- Isolated voltage monitoring systems
- Isolated switch control circuits
- Remote light-controlled switches
- Isolated battery cell monitors
Procurement Notes
Verify the specific suffix TRPBF indicates tape and reel packaging when ordering. Confirm that the component meets UL recognition standards E151738 to UL1577 if isolation certification is required for the final assembly. Ensure the 28-lead SO package dimensions align with the target PCB footprint constraints.
Selection Notes
Select this component when galvanic isolation is required without a secondary power supply on the sensing side. It is suitable for applications needing to monitor AC line parameters or isolate low-voltage sensors from high-voltage logic. Consider the sample rate limitations imposed by the self-powering mechanism when designing for high-speed signal detection.
Part Context
This part belongs to the LTC1531 series of isolated comparators. It is distinct from standard interface ICs like the LTC1535 due to its self-powered nature and specific focus on high-voltage isolation barriers. The device integrates both the comparison logic and the power transfer mechanism within a single semiconductor die.
Replacement Considerations
Consult manufacturer documentation for potential alternate sources as the product may be obsolete. No direct public substitute part numbers are confirmed in the provided datasheet.
