KA78L18AZTA

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

The KA78L18AZTA is a three-terminal positive linear voltage regulator manufactured by onsemi (formerly Fairchild). It provides a fixed output voltage of 18 V with a maximum output current of 100 mA. The device operates within an input voltage range of 20.5 V to 35 V and supports junction temperatures from 0°C to +125°C. Key electrical specifications include a line regulation of 240 mV and a load regulation of 90 mV. It features internal thermal overload protection, short-circuit protection, and safe operating area protection. The component is housed in a TO-92-3 through-hole package.

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

• Provides a fixed 18 V positive output voltage
• Includes internal thermal overload and short-circuit protection
• Designed for low-current applications up to 100 mA

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

• Battery-powered equipment requiring stable low-current power
• General-purpose positive voltage regulation circuits
• Offline switching regulators and card readers

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

Verify the manufacturer status as the part is listed as End-of-Life (EOL) by onsemi. Confirm availability through authorized distributors or secondary markets. Ensure the TO-92-3 package matches the design requirements. Check for RoHS compliance documentation if required for the specific production environment. Validate that the 100 mA current rating suffices for the target application load.

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

Select this component when a fixed 18 V output is required at currents up to 100 mA. The TO-92-3 package is suitable for through-hole mounting. Consider the thermal dissipation capabilities given the 750 mW power dissipation limit. Ensure the input voltage remains between 20.5 V and 35 V for proper regulation. Compare line and load regulation specs against circuit sensitivity requirements.

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

The KA78L18AZTA belongs to the KA78LxxA series of three-terminal positive voltage regulators. This series offers fixed output voltages ranging from 5 V to 24 V. The 'L' designation indicates a lower current capability compared to the standard 1 A variants. These regulators are widely used in general electronics for providing stable DC voltages from higher unregulated sources.

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

Consider the MC78L18ACPRPG as a potential substitute from the same manufacturer family. Verify pinout compatibility and electrical specifications before substitution.