onsemi

MC78L09ABDG

MC78L09ABDG Description

The MC78L09ABDG from onsemi is a fixed-output positive linear voltage regulator designed to deliver a stable 9V output at up to 100mA of continuous current. With a wide input voltage range of up to 30V, this regulator is suitable for applications requiring reliable voltage conversion from higher input sources. Housed in an 8-SOIC surface-mount package, it offers compact integration for space-constrained designs. Although marked as obsolete, it remains a robust choice for legacy systems due to its ROHS3 compliance, REACH unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating, ensuring long-term reliability.

MC78L09ABDG Features

• Fixed 9V Output: Ensures precise voltage regulation without external adjustments.
• High Input Voltage Tolerance (30V Max): Supports a broad range of input sources.
• Low Quiescent Current (6mA): Improves efficiency in battery-powered applications.
• Built-in Protection: Includes over-temperature and short-circuit safeguards for enhanced durability.
• Excellent PSRR (57dB at 120Hz): Minimizes noise and ripple for cleaner power delivery.
• Surface-Mount 8-SOIC Package: Ideal for automated PCB assembly and compact designs.
• RoHS3 Compliant: Meets environmental standards for hazardous substance restrictions.

MC78L09ABDG Applications

• Industrial Control Systems: Provides stable voltage for sensors, microcontrollers, and low-power logic circuits.
• Consumer Electronics: Suitable for audio amplifiers, small displays, and peripheral devices requiring 9V rails.
• Legacy Equipment Maintenance: Ideal for repairing or replacing obsolete power regulation components.
• Automotive Accessories: Powers non-critical subsystems where moderate current and voltage stability are needed.
• Embedded Systems: Used in low-power IoT nodes or portable devices with constrained power budgets.

Conclusion of MC78L09ABDG

The MC78L09ABDG is a dependable linear regulator for applications demanding a fixed 9V supply with moderate current requirements. Its high input tolerance, low quiescent current, and integrated protections make it a practical choice for industrial, consumer, and legacy systems. While newer alternatives may offer improved efficiency, this regulator remains a viable solution for designs prioritizing simplicity, robustness, and compliance with environmental standards.