ADCMP391ARZ-RL7

Overview

The ADCMP391ARZ-RL7 is a single-channel analog comparator manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.3 V to 5.5 V and features rail-to-rail common-mode input capability extending 200 mV beyond the rails. The device guarantees a defined logic low output state when the supply voltage is below the undervoltage lockout threshold of approximately 2.162 V. It consumes a typical quiescent current of 18.6 µA at 25°C. The input offset voltage is typically 1 mV across the full common-mode range, with a maximum of 5 mV over the extended temperature range. Propagation delay varies between 2.8 µs and 9.5 µs depending on the supply voltage and input overdrive conditions.

Feature Summary

• Features a guaranteed known power-up state that asserts a logic low output during startup or undervoltage conditions.
• Supports rail-to-rail input operation with a common-mode voltage range extending 200 mV beyond the supply rails.
• Utilizes an open-drain output stage requiring an external pull-up resistor for high-level signaling.

Applications

• Battery management and monitoring systems
• Power supply detection circuits
• Window comparators for voltage supervision
• Threshold detectors and discriminators
• Microprocessor system reset controls

Procurement Notes

Verify the specific ordering suffix RL7 indicates reel packaging configuration. Confirm RoHS compliance status via manufacturer documentation. Ensure the SOIC-8 package dimensions match the target PCB footprint requirements. Validate that the operating temperature range meets the environmental specifications of the final assembly.

Selection Notes

Select this component for applications requiring low supply current and rail-to-rail input compatibility. Consider the propagation delay characteristics relative to the required signal response speed. Evaluate the need for external hysteresis components if the application environment contains significant noise. Ensure the open-drain output interface aligns with the downstream logic voltage levels.

Part Context

This part belongs to the ADCMP391 series of general-purpose analog comparators. It is designed for battery-powered and portable electronics due to its low power consumption. The device integrates an undervoltage lockout monitor to ensure stable operation during power transitions. It is available in an 8-lead narrow body SOIC package suitable for surface-mount assembly.

Replacement Considerations

The ADCMP391ARZ is a tube-packaged variant of the same functional device. Verify pinout compatibility and electrical specifications before substitution. Check for any differences in thermal resistance or package outline dimensions between the reel and tube versions.

FAQ

What is the behavior of the output during power-up?

The ADCMP391 guarantees a logic low output state when the supply voltage is below the undervoltage lockout threshold, ensuring a defined state before normal operation begins.

How does the input voltage range compare to the supply rails?

The comparator features rail-to-rail inputs that allow the common-mode voltage to extend 200 mV beyond both the ground and positive supply rails.