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MAX809STRG

3-pin uP reset monitor, push-pull RESET, 4.63V threshold, SOT-23

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Manufacturer Part：

MAX809STRG

Package：

SOT-23-3

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Description

Product Overview

The MAX809STRG from onsemi is a 3-pin microprocessor reset circuit in a SOT-23 package. It provides a push-pull active-low RESET output that monitors VCC supply voltages for 2.5V, 3.0V, 3.3V, and 5.0V systems. With a minimum power-on reset pulse width of 140ms and ultra-low supply current of 0.5 µA, this device ensures reliable processor initialization without external components.

Key Specifications

Function Microprocessor Reset Monitor
Output Type Push-Pull Active-Low RESET
Reset Threshold 4.63V (S version, 5V system)
Reset Timeout 140ms minimum
Supply Current 0.5 µA typical at 3.2V
Operating Voltage 1.0V to 5.5V
Operating Temperature -40°C to +105°C
Package SOT-23-3

Features

  • Precision VCC monitoring for 2.5V, 3.0V, 3.3V, and 5.0V supplies
  • 140ms minimum power-on reset pulse width
  • RESET output guaranteed valid to VCC = 1.0V
  • Ultra-low supply current (0.5 µA typical)
  • VCC transient immunity
  • No external components required
  • SOT-23 and SC-70 package options

Applications

  • Embedded systems and microcontroller supervision
  • Battery-powered portable equipment
  • Computers, servers, and workstations
  • Critical microprocessor power supply monitoring
  • Intelligent instruments and automotive systems

The MAX809STRG from onsemi is a cost-effective microprocessor supervisory circuit designed to monitor power supply voltages in digital systems. It asserts an active-low RESET output whenever VCC declines below a preset threshold, maintaining the reset for at least 140ms after VCC rises above the threshold. The S suffix indicates a 4.63V threshold suitable for 5V systems. With supply current as low as 0.5 µA and no external components required, this device is ideal for battery-powered and space-constrained applications.

The MAX809STRG uses an internal voltage reference and comparator to continuously monitor the VCC supply. When VCC falls below the reset threshold (4.63V for the S version), the RESET output is driven low. After VCC rises above the threshold, an internal timeout counter keeps RESET low for a minimum of 140ms to ensure the microprocessor has stabilized before beginning execution. The push-pull output stage provides active drive in both directions, eliminating the need for an external pullup resistor. The device is designed to ignore fast transients on VCC, preventing false reset triggering.

Pin Name Type Function
1 GND Ground Ground connection
2 RESET Output Active-low reset output (push-pull)
3 VCC Power Supply voltage input (monitored)
  • Embedded microcontroller systems requiring reliable power-on reset
  • Battery-powered portable devices needing ultra-low quiescent current
  • Computers, servers, and workstations for supply supervision
  • Automotive ECUs and intelligent instrument monitoring
  • Hot-plug applications requiring transient-immune reset protection
Manufacturer Part Number Package Notes
Analog Devices MAX809TEUR+T SOT-23-3 Original Maxim version, 4.63V threshold
onsemi MAX810STRG SOT-23-3 Active-high RESET variant
onsemi MAX809MTRG SOT-23-3 4.38V threshold (M version)
TI TPS3823-33DBVR SOT-23-5 3.3V watchdog reset, 5-pin
Microchip MCP130T-300I/TT SOT-23-3 3.0V reset, open-drain
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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