APX809S-40SR-7

Supervisors Overview

The APX809S-40SR-7 is a single-channel voltage monitor manufactured by Diodes Incorporated, designed for supervisory circuit applications. It operates within a supply voltage range of 1 V to 5.5 V and features a fixed threshold voltage of 4 V. The device provides an active low, push-pull output with a reset delay time of 240 ms. It lacks manual reset, watchdog timer, or battery backup switching capabilities. The component is housed in a SOT-23-3 surface-mount package and supports operation across a temperature range of -40°C to +125°C.

Supervisors Feature Summary

• Provides automatic power-on reset functionality with active low push-pull output
• Operates over an extended industrial temperature range up to +125°C
• Features low quiescent current consumption suitable for battery-powered systems

Supervisors Applications

• Microprocessor system supervision
• Portable equipment power management
• Consumer electronics voltage monitoring

Supervisors Procurement Notes

Verify the specific suffix SR-7 corresponds to the required tape-and-reel packaging configuration. Confirm that the 4 V threshold aligns with the target system's logic levels. Ensure compatibility with the SOT-23-3 footprint during PCB layout. Check RoHS compliance status against current regulatory requirements for the destination market.

Supervisors Selection Notes

Select this component when an active low reset signal is required for voltages near 4 V. Consider the APX810S series if an active high output is preferred instead. Evaluate the 240 ms reset delay against the microcontroller startup time requirements. Verify that the 5.5 V maximum input rating exceeds the highest expected supply voltage under all operating conditions.

Supervisors Part Context

This part belongs to the APX809S/810S family of simple reset circuits from Diodes Incorporated. The APX809S variant specifically denotes an active low output configuration, distinguishing it from the APX810S series which offers active high outputs. Both families share similar electrical characteristics and packaging options, providing designers with flexible polarity choices for different logic interfaces.

Supervisors Replacement Considerations

Direct substitutes include other APX809S variants with different threshold voltages, such as APX809S-31SR-7. Cross-brand equivalents like MIC809JUY-TR may offer parameter matching but require verification of pinout and timing specifications.