L7809CV Voltage Regulator 9V 1.5A Positive Linear Regulator TO-220

L7809CV Voltage Regulator – 9 V, 1.5 A Positive Linear Regulator (TO‑220)
The L7809CV is a classic three‑terminal linear regulator that delivers a steady 9 V output at up to 1.5 A, regardless of variations in input voltage (up to 35 V) or load conditions. Packaged in a rugged TO‑220 case, it’s a staple for building reliable, low‑noise power supplies in hobby projects, lab prototypes, and classroom labs. By integrating this device into a circuit, students can instantly see how a simple regulator transforms an unstable source into a clean, protected supply for microcontrollers, sensors, and other digital logic.

What Students Will Learn
Working with the L7809CV gives learners hands‑on experience with linear regulation theory, thermal management, and protection features. They’ll explore concepts such as dropout voltage, load regulation, and current limiting, while also practicing PCB layout techniques for heat‑sink attachment and decoupling capacitor placement. The regulator’s straightforward pinout (IN, GND, OUT) makes it an ideal teaching tool for understanding voltage‑reference design, power budgeting, and the trade‑offs between linear and switching regulators.

Key Features & Why It’s Great

• Fixed 9 V output, 1.5 A continuous current
• Wide input range (7 V – 35 V) with low dropout (~2 V)
• Built‑in over‑current and thermal‑shutdown protection
• TO‑220 package with excellent heat‑dissipation capability
• Minimal external components required (just input and output capacitors)

Because it combines simplicity, robustness, and dependable performance, the L7809CV is the go‑to solution for students and educators who need a hassle‑free, “plug‑and‑play” regulator. Its low cost, ubiquitous availability, and proven track record make it perfect for labs that teach power‑supply design, enabling rapid prototyping while reinforcing core electronics principles.