onsemi

MC7912CT

MC7912CT Description

The MC7912CT from onsemi is a fixed-output negative linear voltage regulator designed to deliver a stable -12V output at 1A with high reliability. Housed in a TO-220AB package, this obsolete but robust component remains relevant for legacy designs due to its proven performance. It operates within a wide temperature range (0°C to 125°C) and features a low dropout voltage of 1.3V (typical at 1A), ensuring efficient regulation even under demanding conditions. With 61dB PSRR (120Hz), it effectively suppresses input noise, making it suitable for sensitive analog circuits.

MC7912CT Features

• Fixed Negative Output: Delivers a precise -12V with 1A current capability.
• High Efficiency: Low dropout voltage (1.3V @ 1A) minimizes power dissipation.
• Robust Protection: Includes over-current and over-temperature safeguards for enhanced durability.
• Excellent Noise Rejection: 61dB PSRR at 120Hz ensures clean output in noisy environments.
• Wide Operating Range: Functions reliably from 0°C to 125°C, ideal for industrial applications.
• Through-Hole Mounting: TO-220AB package facilitates easy integration into legacy systems.

MC7912CT Applications

The MC7912CT is ideal for power supply stabilization in systems requiring negative voltage rails, such as:

• Analog and Mixed-Signal Circuits: Op-amp power supplies, audio amplifiers, and data acquisition systems.
• Industrial Equipment: Motor controllers, instrumentation, and test benches.
• Legacy Electronics: Repair or maintenance of older devices where modern alternatives are incompatible.
• Embedded Systems: Low-noise power solutions for microcontrollers and sensors.

Conclusion of MC7912CT

While marked as obsolete, the MC7912CT remains a dependable choice for negative voltage regulation due to its high PSRR, thermal protection, and rugged design. Its 1A output, low dropout, and noise immunity make it particularly valuable in analog-heavy or industrial environments. Engineers working with legacy systems or noise-sensitive applications may find this regulator indispensable despite its discontinued status. For new designs, verifying alternative solutions from onsemi's portfolio is recommended.