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MC7915ACT

MC7915ACT Description

The MC7915ACT from onsemi is a fixed-output, negative-voltage linear regulator designed to deliver a stable -15V output at up to 1A of continuous current. Housed in a TO-220AB package, this through-hole-mount IC is tailored for applications requiring reliable negative voltage regulation with robust protection features. With a low dropout voltage of 1.3V (typical at 1A) and an operating temperature range of 0°C to 125°C, it ensures consistent performance in demanding environments. Although marked as obsolete, it remains a viable choice for legacy designs due to its proven reliability and 60dB PSRR (120Hz), which minimizes noise in sensitive circuits.

MC7915ACT Features

• Fixed Negative Output: Delivers a precise -15V output, simplifying design for negative rail requirements.
• High Current Capacity: Supports 1A output current with over-current and over-temperature protection for enhanced durability.
• Low Dropout Voltage: 1.3V dropout (max) at full load ensures efficient operation even with marginal input-headroom.
• Excellent Noise Rejection: 60dB PSRR at 120Hz reduces ripple in power-sensitive applications.
• Wide Temperature Range: Operates reliably from 0°C to 125°C, suitable for industrial and automotive environments.
• Through-Hole Package: TO-220AB allows easy mounting and heat dissipation in prototyping or production systems.

MC7915ACT Applications

• Power Supplies: Ideal for negative rail generation in dual-voltage systems (e.g., op-amp circuits, audio amplifiers).
• Industrial Equipment: Used in motor controllers, instrumentation, and test gear requiring stable negative bias.
• Legacy Systems: Suitable for maintaining or repairing older electronics where modern alternatives may not be pin-compatible.
• Noise-Sensitive Designs: The high PSRR makes it effective in analog signal chains (e.g., data acquisition, sensors).

Conclusion of MC7915ACT

The MC7915ACT is a robust, albeit obsolete, linear regulator offering high current output, low dropout, and superior noise immunity for negative voltage applications. While newer alternatives exist, its TO-220AB package, protection features, and wide temperature range make it a pragmatic choice for legacy designs or harsh environments. Engineers valuing simplicity and reliability in negative-voltage regulation may still find this IC advantageous for specific use cases.