STMicroelectronics

LD1085V33

LD1085V33 Description

The LD1085V33 from STMicroelectronics is a fixed 3.3V, 3A low-dropout (LDO) linear voltage regulator designed for high-performance power management applications. This obsolete but robust regulator features a wide input voltage range (up to 30V) and delivers a stable 3.3V output with a low dropout voltage of 1.5V at 3A, making it suitable for demanding loads. Its through-hole TO-220AB package ensures easy integration into industrial and consumer electronics. With 72dB PSRR at 120Hz, it excels in noise-sensitive applications, while over-current and over-temperature protection enhance reliability.

LD1085V33 Features

• High Current Output: Delivers 3A continuous current, ideal for powering high-load circuits.
• Low Dropout Voltage: 1.5V dropout at 3A minimizes power dissipation, improving efficiency.
• Excellent Noise Suppression: 72dB PSRR ensures clean output in sensitive analog/digital systems.
• Robust Protection: Built-in over-current and over-temperature safeguards prevent damage under fault conditions.
• Wide Input Range: Supports up to 30V input, accommodating fluctuating power sources.
• RoHS3 Compliant: Meets environmental standards for hazardous substance restrictions.

LD1085V33 Applications

• Industrial Power Supplies: Stable voltage for PLCs, motor controllers, and sensors.
• Embedded Systems: Reliable power for microcontrollers, FPGAs, and memory modules.
• Automotive Electronics: Suitable for infotainment and telematics (within non-critical systems).
• Consumer Electronics: Power management in set-top boxes, routers, and audio equipment.
• Test & Measurement: Low-noise rails for precision analog circuits.

Conclusion of LD1085V33

The LD1085V33 stands out for its high current capability, low dropout, and superior noise rejection, making it a dependable choice for noise-sensitive, high-load applications. While marked obsolete, its durability and performance ensure continued suitability for legacy designs or replacements. Engineers value its protection features and wide input range, though modern alternatives may be preferred for new designs. Ideal for industrial, embedded, and automotive systems requiring stable 3.3V power.