onsemi

MC7905BD2TG

MC7905BD2TG Description

The MC7905BD2TG from onsemi is a fixed-output, negative-voltage linear regulator designed to deliver a stable -5V output at up to 1A of continuous current. Housed in a D2PAK (TO-263) surface-mount package, this regulator is optimized for applications requiring robust power management with minimal external components. With a low dropout voltage of 1.3V (typical at 1A) and 70dB PSRR at 120Hz, it ensures reliable performance in noisy environments. Although marked as obsolete, it remains a viable choice for legacy designs due to its over-current and over-temperature protection, ensuring system safety under fault conditions.

MC7905BD2TG Features

• Fixed -5V Output: Precision-regulated negative voltage for consistent performance.
• High Current Capability: Supports 1A output current with thermal protection.
• Low Dropout Voltage: 1.3V typical at full load, enhancing efficiency.
• Excellent Noise Rejection: 70dB PSRR at 120Hz minimizes ripple in sensitive circuits.
• Robust Protection: Integrated over-current and over-temperature shutdown.
• Surface-Mount Design: D2PAK package for efficient PCB space utilization and heat dissipation.
• Compliance: ROHS3 and REACH unaffected, suitable for environmentally conscious designs.

MC7905BD2TG Applications

• Industrial Power Supplies: Stable negative rail generation for analog and mixed-signal systems.
• Audio Equipment: Low-noise voltage regulation for amplifiers and preamps.
• Legacy Electronics: Maintenance and repair of older systems requiring -5V rails.
• Test & Measurement: Precision voltage references in lab instruments.
• Automotive Electronics: Auxiliary power management (where obsolescence is not critical).

Conclusion of MC7905BD2TG

The MC7905BD2TG is a dependable, high-performance negative-voltage regulator, offering low dropout, high PSRR, and robust protection features. While obsolete, its D2PAK package and 1A output capability make it a pragmatic choice for legacy designs or applications demanding a proven -5V solution. Engineers valuing noise immunity, thermal resilience, and simplicity will find it particularly advantageous in industrial, audio, and instrumentation contexts.