KA7809AETU

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

The KA7809AETU is a three-terminal positive linear voltage regulator from the KA78XXAE series, manufactured by onsemi. It provides a fixed output voltage of 9 V with a maximum output current of 1 A and an output voltage tolerance of ±2%. The device operates within a temperature range of 0°C to +125°C and is housed in a TO-220 package. Key electrical characteristics include a typical quiescent current of 6 mA, a dropout voltage of 2 V at 1 A, and ripple rejection of 62 dB at 120 Hz.

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

• Integrated thermal overload protection prevents damage during excessive heat conditions.
• Built-in short-circuit protection limits current flow to safeguard the component.
• Output transistor safe operating area protection ensures stability under varying load conditions.

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

• Power supplies for electronic equipment requiring stable 9 V DC input
• Battery-powered systems needing regulated voltage conversion
• Internal regulation within general-purpose electronic circuits

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

Verify the specific suffix 'A' indicates the ±2% tolerance variant and the 'E' denotes the TO-220 package configuration. Confirm the manufacturer origin, as this part originated from Fairchild Semiconductor prior to integration into onsemi. Ensure the ordering nomenclature aligns with current system requirements following corporate mergers.

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

Select this component when a precise 9 V output with tighter tolerance than standard variants is required. It is suitable for applications operating between 0°C and +125°C. Consider the 2 V dropout voltage requirement relative to the input supply. Verify that the thermal management strategy accommodates the junction-to-air thermal resistance for the intended load current.

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

This regulator belongs to the KA78XXAE series, which offers improved voltage accuracy compared to the standard KA78XXE line. The series includes various fixed output voltages ranging from 5 V to 24 V. All parts share similar internal protection mechanisms and packaging options, facilitating design consistency across different voltage rails in a single product family.

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

KA7809ETU

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

What is the difference between the KA7809E and KA7809A variants?

The KA7809A variant features a tighter output voltage tolerance of ±2%, whereas the standard KA7809E has a tolerance of ±4%.

Does the KA7809AETU include protection against short circuits?

Yes, the device incorporates internal short-circuit protection to limit current and protect the regulator during fault conditions.