STMicroelectronics

L78L33ACD  

Linear & Switching Voltage Regulators

L78L33ACD Description

The L78L33ACD from STMicroelectronics is a fixed-output linear voltage regulator designed to deliver a stable 3.3V output with a maximum current of 100mA. This surface-mount IC operates within an input voltage range of up to 30V, making it suitable for a variety of low-power applications. With a quiescent current of 5.5mA and a supply current of 6mA (max), it balances efficiency and performance. The device features robust over-current, over-temperature, and short-circuit protection, ensuring reliable operation in demanding environments. Its 49dB PSRR (120Hz) minimizes noise, making it ideal for sensitive analog and digital circuits. Packaged in an 8-pin SOIC (Tube), the L78L33ACD is RoHS3 compliant and REACH unaffected, aligning with modern environmental standards.

L78L33ACD Features

• Fixed 3.3V Output: Precision-regulated voltage for stable power delivery.
• Wide Input Range (Up to 30V): Compatible with higher-voltage supplies.
• Low Quiescent Current (5.5mA): Enhances power efficiency in standby modes.
• High PSRR (49dB at 120Hz): Superior noise suppression for clean power.
• Integrated Protections: Over-current, over-temperature, and short-circuit safeguards.
• Surface-Mount Design (8-SOIC): Compact footprint for space-constrained PCBs.
• Industrial Temperature Range (0°C to 125°C): Reliable performance in harsh conditions.
• RoHS3 & REACH Compliant: Meets stringent environmental regulations.

L78L33ACD Applications

The L78L33ACD is ideal for:

• Consumer Electronics: Powering microcontrollers, sensors, and low-power ICs in portable devices.
• Industrial Systems: Providing stable voltage to control circuits, PLCs, and instrumentation.
• Automotive Electronics: Supporting infotainment systems, dashboards, and lighting modules (within temp limits).
• IoT & Embedded Systems: Enabling efficient power management in battery-operated nodes.
• Medical Devices: Ensuring noise-free voltage regulation for diagnostic equipment.

Conclusion of L78L33ACD

The L78L33ACD stands out as a reliable, low-dropout linear regulator with robust protections and high noise immunity. While obsolete, its wide input range, compact form factor, and industrial-grade durability make it a viable choice for legacy designs or applications requiring proven performance. Its high PSRR and protection features are particularly advantageous in noise-sensitive and mission-critical systems. Engineers seeking a cost-effective, stable 3.3V regulator for low-power designs will find this IC a dependable solution.

L78L33ACD Documents

Download datasheets and manufacturer documentation for L78L33ACD

Datasheets :

L78L Datasheet