AP78L12VL-A

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

The AP78L12VL-A is a three-terminal positive linear regulator from the AP78LXX series by Diodes Incorporated, providing a fixed 12V output. It delivers an output current exceeding 100mA and maintains voltage tolerances of ±5% across operating temperature ranges. The device incorporates internal thermal overload protection, short-circuit current limiting, and safe area protection for output transistors. It operates with an input voltage range of 14.5V to 27V and functions within an ambient temperature range of -20°C to +85°C. The component is housed in a plastic TO-92 package.

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

• Provides local on-card regulation to eliminate distribution problems associated with single-point regulation.
• Improves output impedance significantly compared to Zener diode/resistor combinations while lowering quiescent current.
• Includes built-in thermal overload protection to prevent damage from excessive junction temperatures.
• Features internal short-circuit protection and safe-area protection for pass transistors.

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

• Logic systems
• Communication equipment
• CD-ROM drives
• DVD players
• Set-top boxes

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

Verify that the specific part number corresponds to the TO-92 package variant, as indicated by the 'V' suffix in the ordering information. Confirm compliance with RoHS directives and lead-free finish requirements specified for this package type. Ensure the application design accounts for the recommended operating conditions, including input voltage limits and thermal resistance characteristics for adequate heat sinking during operation.

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

Select this regulator when a fixed 12V output with over 100mA capability is required in space-constrained designs using standard through-hole technology. Consider its low quiescent current and improved output impedance over discrete Zener solutions. Evaluate thermal management needs based on the junction-to-ambient thermal resistance values provided for the TO-92 package under specified test conditions without external heat sinks or airflow.

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

The AP78L12VL-A belongs to the AP78LXX series of three-terminal positive regulators manufactured by Diodes Incorporated. This series includes variants with fixed outputs of 5V, 8V, and 12V. The components are designed to replace Zener diode and resistor combinations, offering superior performance in terms of output impedance and quiescent current consumption. They are suitable for various solid-state electronic equipment applications requiring reliable local voltage regulation.

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

Direct replacements may include other AP78L12 variants with different packaging options such as SO-8 or SOT-89, provided pin compatibility and thermal requirements are met. Cross-manufacturer equivalents like the L78L12 series should be evaluated for matching electrical specifications, particularly output current capabilities and thermal protection features, before substitution.

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

What protection features are integrated into the AP78L12VL-A?

The device includes internal thermal overload protection to prevent damage from excessive junction temperatures, internal short-circuit current limiting to restrict peak output current, and safe area protection for the output transistors to limit internal power dissipation.

How does the AP78L12VL-A compare to a Zener diode/resistor combination?

When used as a replacement for a Zener diode and resistor combination, the AP78L12VL-A can improve output impedance by two orders of magnitude and lower the quiescent current, providing more stable and efficient regulation.