TL431 Adjustable Precision Shunt Regulator – 2.5V to 36V Programmable Voltage Reference

Description

The TL431 is a highly stable, adjustable precision shunt regulator used in a wide range of electronic power circuits. Although many beginners confuse it with a transistor, the TL431 is not a transistor; it is a programmable voltage reference IC capable of regulating voltages from 2.5V up to 36V with high accuracy. It is one of the most commonly used components in SMPS (Switch Mode Power Supply) feedback systems, battery chargers, LED drivers, UPS circuits, and many other regulated power supply applications.

The TL431 operates similarly to a zener diode but with one major advantage: its output voltage is adjustable, giving it more flexibility and control. This makes it suitable for precise voltage regulation in both industrial and hobby circuits. At Rafiq Electronics, you get original & fresh TL431 ICs ideal for your repair and DIY needs.

With its standard TO-92 package, the TL431 is compact and suitable for PCB soldering. It supports an output current of up to 100mA, making it capable of driving many feedback and reference circuits efficiently. It has a low dynamic impedance, which ensures high accuracy and stable regulation even under varying load conditions.

Key Features

⚡ Adjustable Shunt Regulator – Controls voltage from 2.5V to 36V
📏 High Accuracy (±0.5% to ±1%) – Ensures stable output
🔧 TO-92 Package – Easy to solder and install
🔄 Operates Like Adjustable Zener – More precise than fixed zener diodes
🔋 100mA Output Current – Suitable for power feedback circuits
📡 Low Output Noise & High Stability
🧩 Widely Used in SMPS Feedback & Battery Chargers

Electrical Specifications

• Reference Voltage (Vref): 2.495V (typical)

• Adjustable Output Range: 2.5V – 36V

• Output Current: Up to 100mA

• Package Type: TO-92

• Tolerance: ±0.5% / ±1% depending on model

• Operating Temperature: –40°C to +125°C

Applications

🔌 SMPS feedback circuits
🔋 Battery chargers (Li-ion, Lead Acid, etc.)
💡 LED drivers
⚙️ Voltage reference circuits
📟 Microcontroller power regulation
🔄 UPS and inverter power systems

Pin Configuration (TO-92 Package)

Facing the flat side:
1️⃣ Reference (REF)
2️⃣ Anode (A)
3️⃣ Cathode (K)

Why Buy from Rafiq Electronics?

At Rafiq Electronics, we guarantee genuine and fully tested TL431 ICs that deliver reliable performance. Whether you are repairing SMPS power supplies, working on chargers, or designing accurate voltage reference circuits, this TL431 gives you precision, durability, and excellent stability. Our components are trusted by technicians, students, and DIY enthusiasts across Pakistan.

This TL431 precision shunt regulator is ideal for anyone seeking accurate voltage control in power electronics projects. With adjustable output, low noise, and stable performance, it is one of the most versatile and essential ICs used in modern electronic circuits.