ADM825SYRJ-R7

Supervisors Overview

The ADM825SYRJ-R7 is a voltage supervisory circuit manufactured by Analog Devices, housed in an SOT-23-5 surface-mount package. It monitors a single input with a threshold voltage of 4.40 V and an overvoltage threshold of 4.44 V. The device features a push-pull output type and supports manual reset functionality without an integrated watchdog timer or battery backup switch. It operates within a supply voltage range up to 5.5 V, drawing a typical quiescent current of 16 uA. The reset delay time is specified at 280 ms, and the unit maintains accuracy within 2.5%. It is rated for operation between -40 C and +125 C.

Supervisors Feature Summary

• Provides reliable power supervision through a dedicated voltage monitoring input with defined threshold levels.
• Features a push-pull output stage capable of driving downstream logic circuits directly.
• Includes manual reset capability for controlled system initialization independent of voltage conditions.

Supervisors Applications

• Microprocessor power supply monitoring
• Battery-powered system voltage tracking
• Industrial control board supervision

Supervisors Procurement Notes

Verify the specific suffix RJ against the manufacturer's official datasheet to confirm pinout and electrical tolerances. Confirm RoHS compliance status via the latest component documentation. Check for obsolescence notices or lifecycle changes directly from Analog Devices before finalizing procurement plans.

Supervisors Selection Notes

Select this component when a fixed 4.40 V threshold is required for single-input supervision. Consider the 16 uA quiescent current for low-power designs. Ensure the SOT-23-5 package fits the PCB layout constraints. Verify that the 280 ms reset delay meets the timing requirements of the target microcontroller or logic family.

Supervisors Part Context

This part belongs to the ADM825 series of supervisory circuits designed for monitoring power rails in embedded systems. It serves as a critical safety component to ensure proper system startup and shutdown sequences. The series offers various threshold options and package types to suit different design needs.

Supervisors Replacement Considerations

Check for ADM8805 or ADM809 variants with compatible thresholds. Verify pin compatibility and electrical specifications against the original datasheet before substitution.