LTC1540IDD#TRPBF

Overview

The Analog Devices LTC1540IDD#TRPBF is a nanopower comparator with an integrated reference, housed in an 8-lead (3mm × 3mm) plastic DFN package. It operates on a single supply from 2V to 11V or dual supplies of ±1V to ±5.5V. The device features ultralow quiescent current of 0.71µA typical at industrial temperatures and includes a 1.182V ±2% reference output capable of sourcing up to 1mA. It offers TTL/CMOS compatible outputs that can source 40mA continuously without crowbar current glitches. Propagation delay is 60µs with 10mV overdrive.

Feature Summary

• Integrated 1.182V bandgap reference output capable of driving bypass capacitors
• Programmable hysteresis via external resistors connected to the HYST pin
• Glitch-free CMOS output stage eliminating cross-conducting currents during state transitions
• Wide input common-mode range extending from the negative supply rail

Applications

• Battery-powered system monitoring and low-battery detection
• Threshold detectors for voltage level sensing
• Window comparators for multi-level signal analysis
• Oscillator circuits utilizing internal reference timing

Procurement Notes

Verify the specific IDD suffix indicates the industrial temperature grade (-40°C to +85°C) and the TRPBF designation confirms tape and reel packaging. Confirm the 8-lead DFN footprint matches your PCB layout constraints. Ensure supply voltages remain within the 2V to 11V absolute maximum ratings to prevent damage.

Selection Notes

Select this component when ultra-low static power consumption is critical alongside precise threshold detection. The built-in reference eliminates the need for external voltage references, reducing bill of materials count. Consider the DFN package for space-constrained designs requiring leadless thermal dissipation capabilities.

Part Context

This part belongs to the LTC1540 family of nanopower comparators. It shares pin compatibility with devices like the LTC1440 and MAX921/MAX931. The IDD variant specifically denotes the industrial temperature range extension compared to commercial grades, suitable for broader environmental operating conditions.

Replacement Considerations

Pin-compatible alternatives include the LTC1440 and MAX921/MAX931. Verify that substitute parts meet the specific 2V minimum supply requirement and check if their propagation delays align with your circuit's timing constraints.