KA75420ZBU

Supervisors Overview

The KA75420ZBU is a voltage detector manufactured by onsemi, formerly Fairchild Semiconductor. It operates within a supply voltage range of 300 mV to 15 V and features a threshold voltage of 4.2 V. The device monitors one input with under-voltage and over-voltage thresholds of 4.05 V and 4.35 V, respectively. It utilizes an open-drain or open-collector output for reset signaling. The component is housed in a TO-92-3 package designed for through-hole mounting. It functions without manual reset or watchdog timer capabilities. The operating temperature range spans from -25°C to +85°C, with a maximum power dissipation of 200 mW and a quiescent current of 500 µA.

Supervisors Feature Summary

• Provides supervisory monitoring for single-channel voltage inputs with defined threshold levels.
• Generates active-low reset signals via open-drain or open-collector output configuration.
• Operates effectively across a wide supply voltage spectrum down to low millivolt levels.

Supervisors Applications

• Monitoring microprocessor power supply rails
• Ensuring system stability during power-up and power-down sequences
• Protecting embedded systems against undervoltage conditions

Supervisors Procurement Notes

Verify the manufacturer designation carefully, as this component was originally produced by Fairchild Semiconductor and is now managed by onsemi. Confirm that the specific suffix matches the required package and pinout configuration for your design. Check current availability status, as distribution channels may list this part as obsolete or end-of-life depending on regional inventory. Ensure compliance with relevant environmental standards before final integration.

Supervisors Selection Notes

Select this component when a simple, cost-effective voltage supervision solution is required for single-rail monitoring. Consider the TO-92-3 through-hole package if PCB space allows for larger footprints. Evaluate the 4.2 V threshold against the target system voltage to ensure proper reset triggering. Assess the open-drain output compatibility with the receiving logic circuitry to guarantee correct signal interfacing without additional pull-up requirements.

Supervisors Part Context

This device belongs to the KA75 series of voltage detectors, originally developed by Fairchild Semiconductor. The series provides basic power management supervision functions using minimal external components. These detectors are designed for straightforward implementation in consumer electronics and industrial equipment where reliable power monitoring is essential for system integrity and safe operation.

Supervisors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify cross-reference data directly with manufacturer resources for potential equivalents.