LM338T 5A Adjustable Voltage Regulator

LM338T 5A Adjustable Voltage Regulator is a high-current, adjustable linear voltage regulator designed for applications that require a stable and precise output voltage with load currents up to 5 amperes. This device is widely used in industrial power supplies, laboratory bench supplies, battery chargers, audio amplifiers, and high-power embedded systems due to its reliability, simplicity, and excellent electrical performance.

Overview and Core Function

• The LM338T 5A Adjustable Voltage Regulator allows the user to set the output voltage anywhere between 1.2 V and 32 V using only two external resistors.
• It belongs to the classic LM regulator family, but it is specifically optimized for high-current operation, making it suitable for demanding power applications.
• The TO-220 package enables efficient heat dissipation when mounted on an appropriate heatsink.

Key Electrical Characteristics

• Maximum output current: 5 A
• Output voltage range: 1.2 V to 32 V (depending on input voltage)
• Dropout voltage: typically around 2–3 V at full load
• Line regulation: excellent stability against input voltage variations
• Load regulation: maintains consistent output even with changing loads

These characteristics make the LM338T 5A Adjustable Voltage Regulator ideal for circuits that require clean and well-regulated DC power.

Built-in Protection Features

• Thermal shutdown: automatically limits output if the junction temperature becomes too high
• Current limiting: protects the device from overload and short-circuit conditions
• Safe operating area (SOA) protection: prevents damage during high voltage and high current operation

These protections significantly increase system reliability and reduce the need for external safety circuitry.

Typical Applications

• Adjustable bench and laboratory power supplies
• High-current battery chargers
• Motor control power stages
• Audio amplifier power rails
• Industrial and automation control systems

Because of its robustness, the LM338T 5A Adjustable Voltage Regulator is often chosen in professional designs where long-term stability is critical.

Design Advantages

• Simple circuit design with minimal external components
• High output current capability compared to standard LM317
• Proven architecture with wide industry acceptance
• Suitable for both commercial and educational electronics projects

Datasheet Summary

• Package: TO-220
• Input-to-output voltage differential: up to 40 V
• Reference voltage: typically 1.25 V
• Operating junction temperature range: 0 °C to 125 °C
• Manufacturer: Texas Instruments / National Semiconductor (original design)

The official datasheet provides detailed information on electrical characteristics, application circuits, thermal calculations, and protection behavior, making it easy for engineers and technicians to integrate this regulator into their designs.

Conclusion

remains a trusted solution for high-current adjustable voltage regulation. Its combination of simplicity, built-in protection, and strong electrical performance makes it a reliable choice for both professional engineers and advanced hobbyists.

LM338T 5A Adjustable Voltage Regulator Selection Notes

For more compatible parts, explore the . In addition, you can read more about voltage regulator to understand the circuit concept before choosing replacements.

Handling & Safety

Always confirm the rating, polarity and pinout of a voltage regulator ic before installing it, and avoid exceeding its rated voltage or current. Use proper ESD precautions with sensitive parts. These steps protect your circuit and keep your work safe.

Why Choose This Voltage Regulator IC

First, it is a widely used part in electronics repair, prototyping and assembly, so it fits into most existing projects easily. Second, the value, rating or pin count is clearly stated, so you can match it to your circuit with confidence. Third, our team checks basic function before it ships. So, you avoid guesswork when you order. As a result, this is a dependable choice for repair, prototyping or a finished project.

Usage Tips

Before soldering or installing, match the value, package and pin layout with your circuit diagram. Therefore, you avoid a wrong fit or a damaged board. Also, keep small parts stored in labeled bags so values do not get mixed up during a project. As a result, your build stays organized and easier to troubleshoot.

Good to Know

A well-matched voltage regulator ic saves time on the job later. Therefore, double-check the value, rating and pin layout against your circuit before relying on it in a final build. Also, keep the original packaging until you have tested the part, since this makes any exchange easier if something is not right. As a result, your project stays reliable with fewer surprises.

LM338T 5A Adjustable Voltage Regulator

LM338T 5A Adjustable Voltage Regulator دائرة تنظيم جهد مخصص لـ الحفاظ على ثبات جهد خرج الدائرة رغم تغير جهد الدخل.

الاستخدامات

• تصميم وإصلاح مزودات الطاقة
• مراحل تغذية الميكروكنترولر والحساسات
• تنظيم دوائر تعمل بالبطارية
• مشاريع الإلكترونيات المنزلية

ملاحظات الأمان

تأكد دايمًا من القيمة والقطبية وترتيب الأرجل بتاعة دائرة تنظيم جهد قبل التركيب، وماتتخطاش الجهد أو التيار المسموح بيه. استخدم احتياطات الشحنة الساكنة (ESD) مع القطع الحساسة. الخطوات دي بتحمي دائرتك وتخلي شغلك آمن.

ليه تختار دائرة تنظيم جهد ده

أولاً، قطعة مستخدمة بشكل واسع في إصلاح وتجميع الدوائر الإلكترونية، فتتناسب مع معظم المشاريع بسهولة. ثانيًا، القيمة أو التصنيف أو عدد الأرجل موضحة بدقة، فتقدر تطابقها مع دائرتك بثقة. ثالثًا، بنتأكد من الوظيفة الأساسية قبل الشحن. فهو اختيار موثوق للإصلاح أو التجربة أو مشروع متكامل.

تقدر تستعرض باقي المكونات الإلكترونية عندنا لمشروعك القادم.