ADCMP393ARZ

Overview

The ADCMP393ARZ is a quad, rail-to-rail input, low power comparator from Analog Devices. It operates on a single supply voltage ranging from 2.3 V to 5.5 V and draws a quiescent current of 26.8 µA typical. The device features a common-mode input voltage range extending 200 mV beyond the rails, with a typical input offset voltage of 1 mV across the full common-mode range. It includes an undervoltage lockout (UVLO) monitor that guarantees a logic low output when the supply voltage is below 0.9 V. The component is available in 14-lead SOIC packages and supports operation over an extended temperature range of −40°C to +125°C.

Feature Summary

• Rail-to-rail input capability allows signal monitoring up to and slightly beyond supply rails.
• Defined power-up state ensures a guaranteed logic low output during startup before UVLO threshold is reached.
• Low quiescent current consumption makes the device suitable for battery-powered applications.
• Open-drain outputs require external pull-up resistors to interface with various logic levels.

Applications

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

Procurement Notes

Verify the package type matches the design requirements, as the ADCMP393 series is available in both SOIC and TSSOP configurations. Confirm the specific ordering suffix corresponds to the desired tape and reel quantity or cut tape format. Ensure the operating environment stays within the specified -40°C to +125°C temperature range to maintain electrical characteristics. Check for RoHS compliance status if required by assembly standards.

Selection Notes

Select this component for general-purpose comparison tasks requiring low power consumption and wide input voltage ranges. The open-drain output architecture necessitates careful selection of pull-up resistor values to balance rise time and power dissipation. Consider the propagation delay variations based on supply voltage and input overdrive when designing high-speed timing circuits. Verify that the required hysteresis can be implemented externally if noise immunity is critical.

Part Context

The ADCMP393 belongs to the Analog Devices ADCMP393 family of quad comparators. This series is designed for general-purpose analog-to-digital conversion interfaces where low power and wide input range are prioritized. The ARZ designation indicates a lead-free, RoHS-compliant version housed in a standard small outline package. It serves as a cost-effective solution for basic threshold detection and sequencing control in consumer and industrial electronics.

Replacement Considerations

Direct pin-compatible replacements within the same family include the ADCMP393ARZ-RL7 variant, which differs primarily in packaging format. Other quad comparators may require circuit redesign due to differences in input offset voltage, propagation delay, or output stage configuration. Always verify that substitute components meet the specific UVLO and power-up state requirements of the original design.

FAQ

What is the behavior of the ADCMP393 outputs during power-up?

The device guarantees a logic low output state when the supply voltage is below the undervoltage lockout threshold of 0.9 V. Once the supply voltage exceeds this threshold, the comparator inputs take control of the output state.

How does the common-mode input voltage range compare to the supply rails?

The ADCMP393 features a rail-to-rail input stage that allows the common-mode voltage to extend 200 mV beyond both the ground and positive supply rails.

Why is an external resistor required for the ADCMP393 outputs?

The outputs are open-drain type, meaning they can only sink current to ground. An external pull-up resistor is necessary to drive the output to a logic high level and determine the rise time based on the load capacitance.