KA78L18AZBU

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

The KA78L18AZBU is a fixed positive linear voltage regulator from the KA78LXXA series, manufactured by onsemi. It provides a nominal output voltage of 18V with a maximum output current capability of 100mA. The device features thermal overload protection and short circuit current limiting to ensure operational safety. It is housed in a TO-92-3 through-hole package. Electrical specifications include a maximum input voltage of 35V, an operating junction temperature range of 0°C to +150°C, and a ripple rejection ratio of 48dB at 120Hz.

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

• Integrated thermal overload protection prevents damage during overheating conditions.
• Short circuit current limiting safeguards the component against output faults.
• Monolithic construction ensures reliable local regulation for supply currents up to 100mA.

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

• Local on-card voltage regulation
• Logic system power supplies
• Instrumentation circuits

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

Verify that the KA78L18AZBU is confirmed as obsolete or end-of-life status before initiating procurement actions. Confirm availability of direct substitutes such as MC78L18ABPG if active sourcing is required. Ensure compliance with RoHS and REACH environmental standards specified by the manufacturer. Validate that the TO-92-3 package dimensions match the target PCB footprint requirements.

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

Select this component when a fixed 18V output is required with a maximum load current of 100mA. Consider the thermal dissipation capabilities inherent to the TO-92 package under expected load conditions. Verify that the input voltage remains within the 35V absolute maximum rating. Evaluate the need for external bypass capacitors to maintain stability and transient response performance.

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

This part belongs to the KA78LXXA/KA78L05AA family of three-terminal positive voltage regulators. The series offers multiple fixed output voltages including 5V, 6V, 8V, 9V, 10V, 12V, 15V, 18V, and 24V. These regulators are designed for applications requiring low cost and simple implementation with standard passive components.

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

MC78L18ABPG is listed as a direct substitute part number.

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

What is the maximum input voltage allowed for the KA78L18AZBU?

The maximum input voltage is 35V.

Does the KA78L18AZBU include internal protection mechanisms?

Yes, it includes thermal overload protection and short circuit current limiting.