HA1835P, Watchdog Timer and Voltage Regulator, DIP-14

The HA1835P is a watchdog timer and voltage regulator IC, designed for microcontroller-based systems. It combines a precision voltage regulator, watchdog timer, and power-on reset functions into a single IC, reducing the need for external components. Operating within a voltage range of 6V to 30V, the HA1835P provides a stable regulated output (4V-6V) using an external PNP transistor. The watchdog timer monitors clock pulses from the system and triggers a reset signal if pulses stop or fall outside the expected range. This ensures reliable operation and system recovery in case of a malfunction. The power-on reset function generates a startup reset signal to initialize the microcontroller properly. Additionally, the overcurrent protection circuit safeguards the external transistor from excessive current, improving system stability. With its DIP-14 package, the HA1835P is ideal for industrial automation, automotive electronics, and microcontroller-based safety applications.

• Integrated Voltage Regulator – Supports an adjustable 4V-6V regulated output with an external PNP transistor for current handling.
• Wide Operating Voltage Range – Operates between 6V to 30V, making it compatible with various power supply systems​
• Built-in Watchdog Timer – Monitors system pulses and generates a reset if pulse signals deviate from expected frequency.
• Automatic Power-On Reset – Ensures safe startup of microcomputers by providing an initial reset pulse.
• Overcurrent Protection – Includes a current limiter for external transistors, preventing excessive power draw.
• Standard DIP-14 Package – Allows for easy through-hole PCB mounting and prototyping.