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Small black rectangular SOT23 semiconductor component

YINGHUA

YINGHUA MAX809 Monitor and reset SOT23 semiconductor

SKU CH-FRA9-EYVPK

Monitor and reset IC in SOT23 package provides supply-voltage supervision for microcontroller systems

  • Product typeICs Semicoductors
  • Monitors supply voltage and resets processor reliably
  • SOT23 package fits space-constrained PCB layouts easily
  • MAX809 supervisor IC prevents brown-out crashes effectively
  • New condition ensures full specification compliance out-of-box
  • First listed February 21 2025 for current design availability

Reset IC for Microcontroller Supervision

The YINGHUA MAX809 is a monitor and reset integrated circuit in a SOT23 package. It provides a controlled reset signal when supply voltage drops below a defined threshold, protecting microcontrollers from erratic operation during power fluctuations.

Suitable for Embedded Power Monitoring

Designers adding supply-voltage supervision to battery-powered or line-fed boards will find this device fits a standard SOT23 footprint. Engineers needing adjustable threshold voltages, watchdog timers, or multiple monitored rails should evaluate alternative supervisor families.

SOT23 Package Enables Compact Layout

The three-lead SOT23 outline allows placement close to the supervised processor, minimising trace length on the reset line. This small footprint simplifies routing on dense printed-circuit boards without requiring additional passive components.

How it compares

Measured against everything we stock in Encoders & Semiconductor Parts, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 95% of the 1,027 comparable items (median $34.99).

Specifications

Product
Product typeICs Semicoductors

Questions about this item

What voltage rail must my board provide for the MAX809 to operate?

The MAX809 is a monitor and reset IC in SOT23; it supervises the supply rail on its VCC pin and asserts a reset when that rail drops below its internal threshold.

Can I place this SOT23 device on a legacy 5 V PCB alongside older logic?

The MAX809 comes in a standard SOT23 package, so it fits the same footprint used by many legacy supervisory ICs on 5 V boards.

How do I confirm the MAX809 is asserting reset correctly after soldering?

Probe the RESET output with an oscilloscope or logic analyser; it should hold low while VCC is below the trip point and release high once VCC rises above it.

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