The S-81337HG is a voltage detector IC produced by SII Semiconductor Corporation. This IC is designed to monitor voltage levels in electronic circuits and to provide a reset signal to microcontrollers or other devices when the voltage drops below a certain threshold. This protects components from damage due to under-voltage conditions and ensures proper system operation.

Applications

• Microcontroller reset circuits
• Power supply monitoring
• Battery-operated devices
• Industrial control systems
• Automotive electronics

Features

• High-accuracy detection voltage
• Ultra-low current consumption
• Open-drain output
• Small package size (typically SOT-23)
• Hysteresis characteristics

Benefits

• Improved system reliability by preventing operation at low voltages
• Extended battery life in portable devices due to low power consumption
• Simplified circuit design with integrated functionality
• Compact solution suitable for space-constrained applications
• Enhanced noise immunity due to hysteresis

Technical Specifications

The S-81337HG features a specific detection voltage; refer to the datasheet for the exact value. It consumes very low current, usually in the microampere range. The output is an open-drain N-channel MOSFET. It includes built-in hysteresis to prevent oscillation near the threshold voltage. It is available in a small SOT-23 package for compact designs. This voltage detector is designed to operate over a specified temperature range.

The open-drain output allows for flexible interfacing with various microcontrollers and logic circuits. When the input voltage falls below the detection threshold, the output transistor turns off, and the output voltage is pulled high by an external pull-up resistor. When the input voltage rises above the detection threshold plus the hysteresis voltage, the output transistor turns on, pulling the output voltage low. The hysteresis characteristic prevents oscillation or chattering near the detection threshold, ensuring stable operation.