KA2803B

Power Management - Specialized Overview

The KA2803B is an earth leakage detector IC designed for stable operation in AC line breakers. It integrates a differential amplifier, level comparator, and latch circuit to detect ground faults. The device features a built-in voltage regulator and high-gain differential amplifier with low external part count requirements. It operates from a 12V to 20V input supply with a maximum power dissipation of 5mW at 100V/200V. The component provides a 0.4mA output current pulse to trigger SCRs and offers high noise immunity with large surge margins.

Power Management - Specialized Feature Summary

• Integrates differential amplifier, level comparator, and latch circuit for earth leakage detection
• Features built-in voltage regulator and high-gain differential amplifier
• Provides 0.4mA output current pulse to trigger SCRs
• Offers high noise immunity and large surge margin

Power Management - Specialized Applications

• Earth leakage circuit interrupters
• AC line breaker stabilization
• Ground fault detection systems

Power Management - Specialized Procurement Notes

Verify the manufacturer origin carefully as the KA2803B was originally a Fairchild Semiconductor product now under onsemi. Confirm RoHS compliance status as historical data indicates non-compliance for some variants. Ensure the specific suffix (e.g., BDTF) matches the required package type. Cross-reference datasheet revisions to confirm functional equivalence with legacy designs.

Power Management - Specialized Selection Notes

Select this component for applications requiring dedicated earth leakage detection with minimal external components. It is suitable for AC line breaker circuits needing stable operation. Consider the 12V to 20V operating range and 5mW power dissipation limits. Verify temperature range requirements against the specified -25°C to +80°C operational window.

Power Management - Specialized Part Context

The KA2803B belongs to the earth leakage detector family, originally developed by Fairchild Semiconductor and later integrated into onsemi's portfolio. It serves as a specialized solution for safety-critical AC protection circuits. The device replaces discrete solutions by integrating amplification and comparison functions into a single DIP-8 package.

Power Management - Specialized Replacement Considerations

Direct replacements include the KA2803BD variant. Verify pinout compatibility and electrical specifications before substitution. Check for updated datasheet revisions that may affect performance characteristics or packaging options.

Power Management - Specialized FAQ

What is the primary function of the KA2803B?

It is designed for use in earth leakage circuit interrupters to ensure stable operation of AC line breakers by detecting ground faults.

How does the KA2803B handle noise immunity?

The device offers high noise immunity and a large surge margin to prevent false triggering in electrically noisy environments.