DS1816R-20-U

Supervisors Overview

The DS1816R-20-U is a fixed-threshold voltage supervisor circuit manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 2.5V to 5.5V and features a fixed threshold voltage of 3.3V with a 20% tolerance. The device provides a reset signal with a minimum timeout of 100ms and utilizes an open-drain or open-collector output configuration. It is housed in a compact SOT-23-3 package and supports surface-mount installation across an operating temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Provides reliable power supply monitoring through a fixed 3.3V threshold detection mechanism
• Features a manual reset input capability for system control flexibility
• Utilizes low-power operation suitable for battery-powered applications
• Offers a compact SOT-23-3 footprint for space-constrained designs

Supervisors Applications

• Microprocessor system supervision
• Battery-operated electronic devices
• Portable instrumentation power management
• Consumer electronics power sequencing

Supervisors Procurement Notes

Verify the specific suffix designation when ordering, as variants such as DS1816R-20+ or DS1816R-20-U+ may exist with identical electrical characteristics but different packaging or compliance markings. Confirm availability status directly with authorized distributors, as this component may be subject to limited stock or discontinuation notices. Ensure the selected variant matches the required output type and package style for your PCB layout.

Supervisors Selection Notes

Select this component when a simple, cost-effective solution for voltage monitoring is required without the need for adjustable thresholds. The fixed 3.3V threshold makes it suitable for systems powered by standard 3.3V logic rails. Consider the open-drain output requirement for pull-up resistor integration. Evaluate the 100ms reset delay against your microcontroller's startup time requirements to ensure proper system initialization.

Supervisors Part Context

The DS1816 series belongs to Maxim Integrated's EconoReset family of supervisory circuits, designed to provide essential power management functions in a minimal form factor. These devices are engineered to monitor single voltage rails and generate reset signals to protect microprocessors and memory devices from brown-out conditions. The R-20 designation indicates the specific 3.3V threshold variant within this product line.

Supervisors Replacement Considerations

Publicly confirmed substitute part numbers for the DS1816R-20-U are not available in the provided documentation. Verify compatibility with alternative supervisors by matching threshold voltage, package type, and output configuration.