RS809-4.00YSF3

Overview

The RS809-4.00YSF3 is a single-channel supply voltage supervisor manufactured by Runic Technology, designed to monitor power rails and generate reset signals for digital systems. It operates within an input voltage range of 1.2V to 5.5V and features a fixed threshold detection level of 4.00V. The device incorporates a push-pull output stage and consumes a maximum quiescent current of 50μA. It is housed in a compact SOT-23-3 surface-mount package and supports an extended operating temperature range from -40°C to +125°C.

Feature Summary

• Fixed 4.00V threshold detection for precise voltage monitoring
• Push-pull output configuration for direct logic interfacing
• Low power consumption with maximum 50μA quiescent current
• Extended industrial temperature operation up to 125°C

Applications

• Microcontroller system reset generation
• Battery-powered device power management
• Embedded system voltage supervision
• Industrial control board power monitoring

Procurement Notes

Verify the complete part number including the suffix YSF3 to ensure correct packaging and pinout compatibility. Confirm that the 4.00V threshold aligns with the specific rail being monitored. Check for RoHS compliance documentation if required for your manufacturing process. Ensure the SOT-23-3 footprint matches your PCB design constraints.

Selection Notes

Select this component when a fixed 4.00V reset threshold is required for voltages between 1.2V and 5.5V. The push-pull output is suitable for driving logic inputs directly without additional pull-up resistors. Consider the 50μA max current consumption for battery-sensitive applications. Verify thermal requirements against the -40°C to 125°C operating range.

Part Context

This supervisor belongs to the RS809 series from Runic Technology, which offers various fixed voltage thresholds such as 2.63V, 2.93V, 3.08V, and 4.65V. The series shares common features like low power consumption and compact SOT-23 packaging. The RS809-4.00YSF3 specifically targets applications requiring a 4.00V trip point, distinguishing it from other variants in the family.

Replacement Considerations

Compatible substitutes include other RS809 variants with different thresholds if the voltage requirement changes. Cross-reference with similar single-channel supervisors offering push-pull outputs and SOT-23-3 packages. Verify pinout compatibility before substitution to avoid circuit redesign.