KA7809RTM

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

The KA7809RTM is a fixed positive linear voltage regulator from the KA78xx series, manufactured by Fairchild Semiconductor (now onsemi). It provides a nominal output voltage of 9V with a maximum continuous output current of 1A. The device features internal thermal overload protection and short-circuit current limiting to ensure robust operation under fault conditions. It is designed for applications requiring stable DC power supply regulation. The component utilizes a DPAK surface-mount package, suitable for automated assembly processes in compact electronic designs.

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

• Fixed 9V output voltage regulation
• 1A maximum output current capability
• Integrated thermal overload protection
• Short-circuit current limiting

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

• General-purpose DC power supply circuits
• Embedded system voltage regulation
• Industrial control power modules

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

Verify the manufacturer status as Fairchild Semiconductor operations have been acquired by onsemi. Confirm the specific suffix RTM corresponds to the DPAK surface-mount package variant. Check datasheet revisions for electrical parameter consistency. Ensure compatibility with existing PCB footprints for the TO-252/DPAK form factor during procurement planning.

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

Select this component when a fixed 9V output at up to 1A is required in a surface-mount configuration. Consider the thermal performance of the DPAK package relative to the expected load current and ambient temperature. Verify input voltage requirements stay within the specified maximum limits to prevent damage. Compare against other 78xx series variants if different output voltages or through-hole packages are preferred.

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

The KA78xx series represents a legacy line of three-terminal positive voltage regulators widely used in analog and digital circuit design. Originally developed by Fairchild Semiconductor, these components established industry standards for simple, reliable linear regulation. The KA7809RTM specifically adapts this architecture into a modern surface-mount format, bridging traditional reliability with contemporary manufacturing needs.

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

Equivalent parts include MC7809CTG and L78M09CV. Verify pinout compatibility between DPAK and alternative packages like TO-220 before substitution. Electrical parameters such as dropout voltage and quiescent current should be compared to ensure circuit performance remains within specifications.