L7805CV Voltage Regulator: Specs, Alternatives, and Design Guide

Quick Answers: What is the L7805CV and Is It Available?

The STMicroelectronics L7805CV is a fixed 5V, 1.5A positive voltage regulator in a TO-220 package. It operates over an input voltage range of 7V to 35V with a typical dropout voltage of 2V at 1A and a ripple rejection of 62dB at 120Hz. As of 2026-08-21, the L7805CV is in active lifecycle status with 99,999 units in stock at XAIPART, priced at $0.1464 per unit at 1,000+ quantity. This guide covers its specifications, design considerations, drop-in alternatives, and market outlook.

Technical Guide: How to Select and Design with the L7805CV

Understanding the L7805CV Specifications

The L7805CV provides a fixed 5V output with ±2% tolerance (4.8V to 5.2V). Its maximum output current is 1.5A, but the actual achievable current depends on the input-output voltage differential and thermal management. The input voltage range is 7V to 35V, with a typical dropout voltage of 2V at 1A. The quiescent current is typically 6mA. The device features internal current limiting, thermal shutdown, and safe-area compensation.

Design Considerations

When designing with the L7805CV, consider the following:

• Input and Output Capacitors: Use a 0.33µF input capacitor and a 0.1µF output capacitor to ensure stability and reduce noise. Place them close to the respective pins.
• Thermal Management: The TO-220 package has a thermal resistance from junction to case of 5°C/W. At VIN=12V, VOUT=5V, and 1A load, power dissipation is 7W. Without a heatsink, the junction temperature would exceed the maximum of 150°C. Use a heatsink with thermal resistance of 10°C/W or lower.
• Power Dissipation Calculation: Power dissipation = (VIN - VOUT) × IOUT. For VIN=12V, VOUT=5V, IOUT=1A, PD = (12-5)×1 = 7W.
• Operating Temperature: The operating temperature range is 0°C to +125°C. Derate based on power dissipation and thermal resistance.

Step-by-Step Design Process

1. Determine the required output voltage and current. For 5V and up to 1.5A, the L7805CV is suitable.
2. Verify the input voltage range. The input must be between 7V and 35V.
3. Calculate power dissipation and select an appropriate heatsink.
4. Add input and output capacitors as recommended.
5. Ensure proper PCB layout with short traces and adequate copper area for heat dissipation.

Alternatives & Comparison: Drop-In Replacements for L7805CV

Several drop-in alternatives exist with the same TO-220 package, pinout, and 5V output. The following table compares the L7805CV with its alternatives based on verified data.

All alternatives are functionally identical in terms of package, pinout, and output specifications. The choice may depend on availability, price, and manufacturer preference.

Industry Insight: Market Position and Lifecycle

The L7805CV is in active lifecycle status, indicating ongoing production and availability. As of 2026-08-21, XAIPART has 99,999 units in stock, with a base price of $0.1464 at 1,000+ quantity. The 78xx series is a mature product family widely used in various applications. [DATA_NEEDED: global market share, specific supply chain details]

Trends & Outlook: What Buyers Should Watch

While linear regulators like the L7805CV remain popular for low-noise applications, the industry is shifting toward more efficient switching regulators. However, the L7805CV's simplicity, low cost, and proven reliability ensure continued demand. Buyers should monitor pricing trends and availability, as the mature lifecycle may see gradual price increases or supply constraints. [VERIFY_NEEDED: long-term availability projections]