KA7909TU

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

The KA7909TU is a three-terminal negative voltage regulator from the KA79XX series, manufactured by ON Semiconductor. It provides a fixed output voltage of -9 V with a tolerance of ±4%. The device is housed in a TO-220 package and supports an output current exceeding 1 A. Key electrical characteristics include a maximum input voltage of -35 V and an operating temperature range of 0 to +125 °C. Internal protections encompass thermal overload shutdown, short-circuit protection, and output transistor safe operating area compensation.

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

• Integrated internal thermal overload protection for automatic shutdown during overheating events
• Built-in short-circuit protection to safeguard the device under fault conditions
• Output transistor safe operating area compensation ensures stable operation across varying loads

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

• Negative fixed output power supply regulation
• Split power supply systems requiring dual polarity rails
• Local on-card voltage regulation for electronic circuits

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

Verify that the ordering suffix TU corresponds to the TO-220 package with dual gauge leads and rail packing method as specified in the official datasheet. Confirm the component belongs to the KA79XX series rather than the LM79XX or KA79XXA variants, which may have different tolerances or specifications. Ensure the manufacturer designation matches ON Semiconductor documentation.

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

Select this component when a reliable -9 V negative rail is required for linear regulation applications. The device is suitable for designs needing over 1 A of output current provided adequate heat sinking is implemented. Consider the specific ±4% voltage tolerance and the requirement for external bypass capacitors to ensure stability and optimal transient response within the specified operating temperature range.

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

This part belongs to the KA79XX series of three-terminal negative regulators produced by ON Semiconductor. The series offers multiple fixed output voltages in the TO-220 package, designed for wide-ranging applications. These regulators are characterized by robust internal protection features and high output current capabilities, making them standard choices for negative voltage generation in power management circuits.

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

LM7909CT

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

What internal protections does the KA7909TU provide?

The device includes internal current limiting, thermal shutdown, and output transistor safe operating area protection.

Can the KA7909TU be used to create adjustable voltages?

Although designed primarily as a fixed voltage regulator, it can be used with external components to obtain adjustable voltages and currents.