AN78L18M

Overview

The AN78L18M is a 3-pin fixed positive output monolithic voltage regulator from the AN78LxxM series, manufactured by Panasonic. It provides a stabilized 18V output with a maximum current capacity of 100mA without requiring external components. The device features an absolute maximum input voltage rating of 40V and operates within a junction temperature range of -55°C to +125°C. Electrical characteristics include a typical line regulation of 45mV and load regulation of 30mV at 25°C. The unit incorporates built-in overcurrent limiting and thermal overload protection circuits for enhanced reliability.

Feature Summary

• Provides stabilized fixed positive output voltage directly from unstable DC input without external parts
• Integrates internal overcurrent limit circuitry to protect against excessive load conditions
• Includes built-in thermal overload protection circuit to prevent damage during overheating

Applications

• Power supply circuits requiring stable 18V rails
• General electronic equipment power regulation
• Office equipment voltage stabilization
• Communications equipment power management

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package type matches HSIP003-P-0000Q lead-free specifications if applicable. Check datasheet revisions for updated electrical parameters before final design integration. Ensure compliance with export regulations if transferring materials across borders.

Selection Notes

Select this regulator when a fixed 18V output is required with up to 100mA load current. Consider the minimum input/output voltage difference of approximately 1.7V when designing input stages. Evaluate thermal dissipation requirements based on ambient temperature and board copper area. Verify that input voltage does not exceed the 40V absolute maximum rating under all operating conditions.

Part Context

This component belongs to the AN78Lxx/AN78LxxM series of 3-pin positive output voltage regulators. The 'M' suffix denotes the specific package variant utilizing the HSIP003-P-0000Q lead-free package dimensions. The series offers twelve fixed voltage options ranging from 4V to 24V, sharing common architectural features including monolithic construction and integrated protection mechanisms.

Replacement Considerations

Cross-reference with other manufacturers offering equivalent 3-pin linear regulators providing 18V output at 100mA. Verify pinout compatibility and thermal performance characteristics. Ensure replacement devices meet the same absolute maximum ratings and electrical specifications defined in the original datasheet.