The S-81340HG-KJ is a voltage detector IC produced by SII Semiconductor Corporation. This device is designed to monitor the input voltage and trigger a reset signal if the voltage drops below a specific threshold. The "KJ" designation usually signifies a particular voltage detection level. It is essential for safeguarding microcontrollers and other sensitive electronic components from operating under insufficient voltage conditions.

Applications

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

Features

• High-accuracy voltage detection
• 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-81340HG-KJ has a detection voltage specific to the "KJ" variant; consult the datasheet for the exact value. It features ultra-low current consumption, typically in the microampere range. The output is an open-drain N-channel MOSFET. It includes built-in hysteresis to prevent oscillations 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.