STMicroelectronics

L79L05ACD

L79L05ACD Description

The L79L05ACD from STMicroelectronics is a fixed negative voltage regulator designed to deliver a stable -5V output with a maximum current output of 100mA. Housed in an 8-pin SOIC package, this surface-mount IC is optimized for compact and efficient power management in low-power applications. With a quiescent current of 5.5mA and a supply current of up to 6mA, it balances performance with power efficiency. The device operates over a wide temperature range of 0°C to 125°C, making it suitable for industrial and consumer electronics. Though marked as obsolete, it remains a reliable choice for legacy designs due to its ROHS3 compliance and REACH-unaffected status.

L79L05ACD Features

• Fixed -5V Output: Ensures consistent voltage regulation for sensitive circuits.
• High PSRR (49dB at 120Hz): Minimizes noise and ripple, ideal for analog and mixed-signal systems.
• Built-in Protection: Features over-temperature and short-circuit protection for enhanced reliability.
• Low Quiescent Current (5.5mA): Reduces power dissipation in standby modes.
• Surface-Mount Design (8-SOIC): Saves board space and simplifies assembly.
• Wide Operating Temperature Range (0°C to 125°C): Suitable for harsh environments.

L79L05ACD Applications

The L79L05ACD is ideal for:

• Negative Voltage Supplies: Powering op-amps, sensors, and analog circuits requiring -5V rails.
• Industrial Control Systems: Where stable voltage regulation is critical under varying loads.
• Consumer Electronics: Such as audio amplifiers and portable devices needing compact power solutions.
• Legacy Equipment Maintenance: Replacing older regulators in existing designs due to its obsolete status but proven reliability.

Conclusion of L79L05ACD

The L79L05ACD offers a robust, space-efficient solution for low-power negative voltage regulation, combining high PSRR, thermal protection, and wide temperature tolerance. While newer alternatives may exist, its performance and durability make it a preferred choice for specific applications, particularly in legacy or cost-sensitive designs. Engineers valuing noise immunity and compact form factors will find this regulator well-suited for precision power delivery.