KA7809AE

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The KA7809AE is a three-terminal positive voltage regulator from the KA78XXAE series, manufactured by onsemi. It provides a fixed output voltage of 9V with a maximum output current of 1A and an input voltage range up to 35V. The device features ±2% output voltage tolerance at 25°C and operates within a temperature range of 0°C to +125°C. Electrical characteristics include a typical quiescent current of 6mA, ripple rejection of 62dB at 120Hz, and a dropout voltage of 2V at 1A load. Protection mechanisms include thermal overload shutdown, short-circuit protection, and safe operating area (SOA) protection.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrated thermal overload protection for automatic shutdown during excessive heat conditions
• Internal short-circuit protection limits current to prevent damage during fault events
• Output transistor safe operating area protection ensures stability under varying load conditions

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• DC-to-DC conversion circuits requiring stable positive voltage regulation
• Power supply sections in equipment utilizing TO-220 packaged regulators
• Applications necessitating internal current limiting and thermal shut-down capabilities

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify component authenticity through authorized distributors or official manufacturer channels. Confirm package type matches TO-220 specifications and check for updated part nomenclature due to Fairchild Semiconductor integration into onsemi. Ensure compliance with RoHS standards and verify that ordering suffixes correspond to correct tolerance and packaging options.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this regulator for applications requiring a fixed 9V output with up to 1A current capability. Consider the ±2% tolerance specification for precision requirements. Evaluate thermal management needs based on the junction-to-air thermal resistance and expected power dissipation. Ensure input voltage remains within the 35V absolute maximum rating to maintain device integrity.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

The KA7809AE belongs to the KA78XXE/KA78XXAE family of three-terminal positive voltage regulators originally developed by Fairchild Semiconductor. Following the acquisition by onsemi, some part numbers underwent nomenclature changes, replacing underscores with dashes. This series is designed for general-purpose linear regulation tasks, offering robust protection features and reliable performance in standard industrial and commercial environments.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

MC7809CTG