STMicroelectronics

L7918CV

L7918CV Description

The L7918CV from STMicroelectronics is a fixed negative voltage regulator delivering a stable -18V output with a robust 1.5A current capacity. Designed for through-hole mounting in a TO-220AB package, this linear regulator is engineered for reliability in demanding environments, operating across a wide temperature range of 0°C to 125°C. With a low dropout voltage of 1.1V (typical at 1A) and 60dB PSRR (120Hz), it ensures efficient noise suppression and stable performance in power-sensitive applications. Though marked as obsolete, it remains a viable choice for legacy systems due to its ROHS3 compliance and REACH-unaffected status.

L7918CV Features

• Output Configuration: Negative voltage regulation (-18V fixed).
• High Current Capacity: Supports up to 1.5A output current with short-circuit and thermal overload protection.
• Low Dropout: 1.1V dropout (typical at 1A) minimizes power dissipation.
• Excellent Noise Rejection: 60dB PSRR (120Hz) ensures clean output in noisy environments.
• Wide Operating Range: Functions reliably from 0°C to 125°C, suitable for industrial applications.
• Robust Packaging: TO-220AB through-hole design for easy heat dissipation and mechanical stability.
• Compliance: ROHS3 and REACH-unaffected, meeting environmental standards.

L7918CV Applications

The L7918CV is ideal for systems requiring stable negative voltage rails, including:

• Power supplies for analog circuits, audio amplifiers, and instrumentation.
• Industrial control systems where consistent negative bias is critical.
• Legacy electronics repair, offering a drop-in replacement for obsolete designs.
• Test and measurement equipment demanding low-noise voltage references.
• Automotive and aerospace subsystems (within its temperature limits) requiring rugged regulation.

Conclusion of L7918CV

The L7918CV stands out for its high current output, low dropout, and robust protection features, making it a dependable choice for negative voltage regulation. While newer alternatives exist, its proven reliability, noise immunity, and thermal resilience ensure continued relevance in industrial, audio, and legacy applications. Engineers seeking a cost-effective, high-performance negative regulator for through-hole designs will find this IC a practical solution.