onsemi

MC7908CTG

MC7908CTG Description

The MC7908CTG from onsemi is a fixed-output negative linear voltage regulator designed to deliver a stable -8V output with a 1A current capacity. Housed in a TO-220AB package, this through-hole-mount IC is engineered for robustness, featuring over-current and over-temperature protection to ensure reliable operation under demanding conditions. With a low dropout voltage of 1.3V (typical at 1A) and a high PSRR of 62dB (120Hz), it excels in noise-sensitive applications. Although marked as obsolete, its ROHS3 compliance and REACH unaffected status make it a viable choice for legacy designs requiring dependable power regulation.

MC7908CTG Features

• Fixed -8V Output: Ensures consistent voltage delivery for precision circuits.
• High Current Capacity: Supports up to 1A output current, suitable for powering moderate loads.
• Low Dropout Voltage: 1.3V (typical at 1A) minimizes power dissipation, enhancing efficiency.
• Excellent Noise Suppression: 62dB PSRR (120Hz) reduces ripple in sensitive analog/digital systems.
• Robust Protection: Integrated over-current and over-temperature safeguards.
• Wide Operating Range: Functions reliably from 0°C to 125°C, ideal for industrial environments.
• Through-Hole Design: TO-220AB package simplifies heat dissipation and mechanical integration.

MC7908CTG Applications

• Industrial Power Supplies: Stable negative voltage rails for control systems and instrumentation.
• Audio Equipment: Low-noise regulation for preamps, mixers, and signal processing circuits.
• Legacy Electronics: Maintenance or replication of older designs requiring -8V rails.
• Test & Measurement: Precision voltage references in lab equipment.
• Automotive Electronics: Auxiliary power in non-critical subsystems (within operating temperature limits).

Conclusion of MC7908CTG

The MC7908CTG is a dependable, albeit obsolete, negative voltage regulator offering high current output, low dropout, and superior noise rejection. Its rugged protection features and wide temperature range make it suitable for industrial, audio, and legacy applications. While newer alternatives exist, its proven performance and ease of integration ensure continued relevance in specific use cases. Engineers should evaluate replacement options for future-proof designs but can rely on this IC for existing systems requiring a stable -8V supply.