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MC7918CT

MC7918CT Description

The MC7918CT from onsemi is a fixed-output negative linear voltage regulator designed to deliver a stable -18V output at up to 1A of continuous current. Housed in a rugged TO-220AB package, this obsolete but reliable component is suited for through-hole mounting and operates across a wide temperature range of 0°C to 125°C. With a low dropout voltage of 1.3V (typical at 1A) and excellent 59dB PSRR (120Hz), it ensures efficient regulation even in noisy environments. The device includes critical protection features such as over-current and over-temperature shutdown, enhancing system reliability.

MC7918CT Features

• Fixed Negative Output: Delivers a precise -18V output, simplifying design for negative voltage rail requirements.
• High Current Capability: Supports 1A output current, making it suitable for powering moderate loads.
• Low Dropout Voltage: 1.3V (max) at full load ensures efficient operation with minimal headroom.
• Robust Protection: Integrated over-current and over-temperature safeguards prevent damage under fault conditions.
• High PSRR: 59dB at 120Hz minimizes noise interference, ideal for sensitive analog circuits.
• Wide Operating Temperature: Performs reliably in harsh environments (0°C to 125°C).

MC7918CT Applications

The MC7918CT is ideal for applications requiring stable negative voltage rails, including:

• Industrial Power Supplies: Used in control systems and instrumentation requiring regulated negative voltages.
• Audio Amplifiers: Provides clean negative bias for op-amps and analog signal chains.
• Test & Measurement Equipment: Ensures precision voltage references in lab-grade instruments.
• Legacy Systems: Maintains compatibility with older designs where through-hole regulators are preferred.

Conclusion of MC7918CT

While marked as obsolete, the MC7918CT remains a robust choice for designers needing a dependable -18V linear regulator with high current capability and strong noise rejection. Its TO-220AB package and protection features make it suitable for industrial, audio, and legacy applications where reliability is critical. For new designs, verify availability or consider modern alternatives with similar specifications from onsemi's portfolio.