MAX809T-3.08V

Updated: 2026-09-10

Overview

The MAX809T-3.08V is a voltage supervisor integrated circuit (IC) manufactured by Maxim Integrated (now part of Analog Devices). It is designed to monitor the power supply voltage in electronic systems and generate a reset signal when the voltage drops below the predefined threshold of 3.08V. This ensures that microprocessors and other critical components operate only within safe voltage ranges, preventing erratic behavior or data corruption. The device is housed in a compact SOT-23 package, making it suitable for space-constrained applications. It is commonly used in embedded systems, automotive electronics, and industrial controls where reliable voltage monitoring is essential. The MAX809T-3.08V is known for its low quiescent current (typically 5µA), which minimizes power consumption in battery-powered devices.

Structure and Working Principle

The MAX809T-3.08V consists of a precision voltage reference, a comparator, and an output driver. The voltage reference maintains a stable 3.08V threshold, which the comparator uses to evaluate the input voltage (VCC). When VCC falls below 3.08V, the comparator triggers the output driver to assert a reset signal (active-low RESET). The IC operates over a wide supply voltage range (1.2V to 5.5V) and includes built-in hysteresis to prevent chatter during voltage transitions. The reset signal remains asserted for a minimum of 140ms after VCC rises above the threshold, ensuring sufficient time for system stabilization. The device requires no external components for basic operation, simplifying circuit design.

Key Features

1. Precision Threshold: The 3.08V threshold is accurate to ±1.5%, ensuring reliable monitoring even in demanding environments. 2. Low Power Consumption: With a typical quiescent current of 5µA, the IC is ideal for battery-powered applications. 3. Compact Package: The SOT-23-3 package (2.9mm x 1.6mm) saves board space and suits high-density designs. Additional features include a wide operating temperature range (-40°C to +85°C), making it suitable for industrial and automotive applications. The device is also immune to short voltage transients, reducing false resets due to noise.

Application Areas

The MAX809T-3.08V is widely used in systems requiring reliable voltage monitoring, such as: 1. Microprocessor and Microcontroller Systems: Ensures safe startup and shutdown sequences. 2. Automotive Electronics: Monitors battery voltage in infotainment, engine control, and safety systems. 3. Industrial Controls: Provides fail-safe operation in PLCs, sensors, and motor drives. It is also found in consumer electronics (e.g., smart home devices), medical equipment, and communication systems where voltage stability is critical. The IC's small footprint and low power consumption make it a preferred choice for portable and IoT devices.

Maintenance and Precautions

To ensure optimal performance of the MAX809T-3.08V, follow these guidelines: 1. PCB Layout: Place the IC close to the monitored voltage rail to minimize noise. Use a ground plane for stability. 2. Voltage Ratings: Do not exceed the absolute maximum supply voltage (6V) to prevent damage. 3. Temperature Management: Avoid prolonged exposure to temperatures beyond the specified range (-40°C to +85°C). For systems with high noise, consider adding a small bypass capacitor (0.1µF) near the VCC pin. Regularly test the reset functionality during development to confirm proper operation under low-voltage conditions.

B2B Procurement Guide

When sourcing the MAX809T-3.08V, consider the following: 1. Supplier Verification: Purchase from authorized distributors (e.g., Digi-Key, Mouser) to avoid counterfeit parts. 2. Packaging Options: The IC is available in tape-and-reel (3,000 units per reel) or cut tape for prototyping. 3. Lead Time: Standard lead times range from 2-6 weeks; plan inventory accordingly. For high-volume orders, negotiate pricing based on quantity tiers. Verify datasheet revisions and RoHS compliance if environmental regulations apply. Alternative parts with similar functionality (e.g., TPS3808 from Texas Instruments) can be evaluated for cost or availability reasons.