UC3901QTR

Product Overview

• Category: Integrated Circuit
• Use: Voltage Supervisor
• Characteristics: Low-power, Precision Monitoring, Adjustable Thresholds
• Package: QFN (Quad Flat No-Lead)
• Essence: Monitors voltage levels and provides reset signals
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.8V to 5.5V
• Threshold Voltage Range: Adjustable from 0.4V to 4.6V
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 2µA (typical)

Pin Configuration

The UC3901QTR package consists of 16 pins:

1. VDD - Supply Voltage Input
2. GND - Ground
3. RESET - Reset Output
4. TH - Threshold Voltage Adjustment
5. MR - Manual Reset Input
6. NC - No Connection
7. NC - No Connection
8. NC - No Connection
9. NC - No Connection
10. NC - No Connection
11. NC - No Connection
12. NC - No Connection
13. NC - No Connection
14. NC - No Connection
15. NC - No Connection
16. NC - No Connection

Functional Features

• Monitors the supply voltage and generates a reset signal when it falls below a certain threshold.
• The threshold voltage can be adjusted using an external resistor connected to the TH pin.
• Provides a manual reset input for immediate system reset.
• Low quiescent current consumption ensures minimal power usage.

Advantages and Disadvantages

Advantages: - Wide supply voltage range allows compatibility with various systems. - Adjustable threshold voltage enables flexibility in monitoring different voltage levels. - Low-power operation prolongs battery life in portable devices. - Small package size saves board space.

Disadvantages: - Limited number of pins may restrict the integration of additional features. - Lack of built-in hysteresis may result in potential noise-related issues.

Working Principles

The UC3901QTR is designed to monitor the supply voltage of a system. It compares the input voltage with an adjustable threshold voltage set by the TH pin. When the supply voltage drops below the threshold, the RESET pin is activated, generating a reset signal to initiate system recovery. The threshold voltage can be adjusted using an external resistor connected to the TH pin.

Detailed Application Field Plans

The UC3901QTR is commonly used in various applications where voltage monitoring and system reset functionality are required. Some specific application fields include:

1. Power Management Systems: Ensures stable operation by monitoring power supply voltages and initiating resets when necessary.
2. Battery-Powered Devices: Maximizes battery life by monitoring voltage levels and preventing excessive discharge.
3. Industrial Control Systems: Provides reliable reset signals to ensure proper functioning of critical equipment.
4. Automotive Electronics: Monitors vehicle power systems and triggers resets in case of voltage fluctuations or failures.
5. Home Automation: Safeguards smart home devices by monitoring power supply integrity and initiating resets if needed.

Detailed and Complete Alternative Models

1. UC3901N - DIP (Dual Inline Package) version of UC3901QTR.
2. UC3901DW - SOIC (Small Outline Integrated Circuit) version of UC3901QTR.
3. UC3901QTRG3 - Green packaging variant of UC3901QTR, compliant with RoHS regulations.

These alternative models offer similar functionality and characteristics but differ in package type and pin configuration.

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