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LM317 Adjustable Voltage Regulator IC
Build reliable, adjustable power supplies with the LM317 - the industry-standard 3-terminal positive voltage regulator capable of delivering output voltages from 1.25V to 37V at up to 1.5A. Available at The Engineer Store, Bengaluru, with fast shipping and full technical support.
Specifications
| Part Number | LM317 / LM317T |
| Package | TO-220 (through-hole) |
| Regulator Type | Positive Adjustable Linear Voltage Regulator |
| Output Voltage Range | 1.25V to 37V (adjustable via external resistors) |
| Output Current (Max) | 1.5A |
| Input Voltage (Max) | 40V |
| Dropout Voltage | ~2V (typical) |
| Line Regulation | 0.01% / V (typical) |
| Load Regulation | 0.1% (typical) |
| Built-in Protection | Thermal overload, short-circuit, safe operating area (SOA) |
| Operating Temperature | 0 degreesC to +125 degreesC (junction) |
| Pin Configuration | Pin 1: Adjust | Pin 2: Output | Pin 3: Input |
| Origin | Original / Authentic from authorized supply chain |
| Warranty | 7-day warranty on manufacturing defects |
| Support | Email & WhatsApp 24/7 |
Key Features
- Wide adjustable output range: Set any voltage from 1.25V to 37V using just two external resistors (R1 and R2)
- High output current: Delivers up to 1.5A, suitable for powering microcontrollers, sensors, motors, and more
- Excellent regulation: Tight line and load regulation ensures stable output under varying conditions
- Comprehensive built-in protection: Thermal shutdown, current limiting, and safe operating area protection prevent damage from overloads and short circuits
- Low quiescent current: Efficient operation with minimal wasted power at the adjust pin
- Industry-standard TO-220 package: Easy to mount on heatsinks for high-current applications; breadboard and PCB friendly
- Drop-in replacement: Compatible with LM317T, LM317HVT, and equivalent parts from major manufacturers
Why Choose the LM317 from The Engineer Store?
- 100% authentic ICs sourced directly from trusted, authorized distributors - no counterfeits
- 1-5 day shipping, 7-8 day delivery across India from our Bengaluru warehouse; same-day delivery within Bengaluru
- Expert technical support included - get help with circuit design, resistor calculations, and troubleshooting
- Thoroughly tested and inspected before dispatch
- Competitive pricing with bulk discounts for volume orders
How It Works - Basic Circuit
The LM317 uses a simple resistor-divider network to set the output voltage. Connect a fixed resistor (R1, typically 240Ohm) between the Output and Adjust pins, and a second resistor (R2) between the Adjust pin and ground. The output voltage is calculated as:
V_out = 1.25V x (1 + R2 / R1)
For best performance, add a 0.1uF ceramic capacitor at the input and a 1uF electrolytic capacitor at the output to ensure stability and reduce noise. A protection diode across the output-to-input pins is recommended when using large output capacitors.
Common Output Voltage Examples
| Desired Output | R1 | R2 |
| 3.3V | 240Ohm | 394Ohm |
| 5V | 240Ohm | 720Ohm |
| 9V | 240Ohm | 1.49kOhm |
| 12V | 240Ohm | 2.06kOhm |
Project Ideas
- Variable Benchtop Power Supply: Pair with a potentiometer in place of R2 to create a continuously adjustable power supply for your electronics workbench - output from 1.25V to 37V
- Battery Charger Circuit: Build a constant-current/constant-voltage charger for Li-ion, NiMH, or lead-acid batteries with precise voltage control
- Microcontroller Power Supply: Regulate uneven wall adapter or battery voltage down to a stable 3.3V or 5V for Arduino, ESP32, STM32, or
Frequently Asked Questions
When will I receive my order?
Products ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.
Is technical support available?
Yes, 24/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.
What is your return policy?
7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.
Buy LM317 Adjustable Voltage Regulator IC Online in India
Purchase the LM317 Adjustable Voltage Regulator IC online at The Engineer Store - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on LM317 Adjustable Voltage Regulator IC with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.
Looking to buy LM317 Adjustable Voltage Regulator IC at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.
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LM317 Adjustable Voltage Regulator IC
Build reliable, adjustable power supplies with the LM317 - the industry-standard 3-terminal positive voltage regulator capable of delivering output voltages from 1.25V to 37V at up to 1.5A. Available at The Engineer Store, Bengaluru, with fast shipping and full technical support.
Specifications
| Part Number | LM317 / LM317T |
| Package | TO-220 (through-hole) |
| Regulator Type | Positive Adjustable Linear Voltage Regulator |
| Output Voltage Range | 1.25V to 37V (adjustable via external resistors) |
| Output Current (Max) | 1.5A |
| Input Voltage (Max) | 40V |
| Dropout Voltage | ~2V (typical) |
| Line Regulation | 0.01% / V (typical) |
| Load Regulation | 0.1% (typical) |
| Built-in Protection | Thermal overload, short-circuit, safe operating area (SOA) |
| Operating Temperature | 0 degreesC to +125 degreesC (junction) |
| Pin Configuration | Pin 1: Adjust | Pin 2: Output | Pin 3: Input |
| Origin | Original / Authentic from authorized supply chain |
| Warranty | 7-day warranty on manufacturing defects |
| Support | Email & WhatsApp 24/7 |
Key Features
- Wide adjustable output range: Set any voltage from 1.25V to 37V using just two external resistors (R1 and R2)
- High output current: Delivers up to 1.5A, suitable for powering microcontrollers, sensors, motors, and more
- Excellent regulation: Tight line and load regulation ensures stable output under varying conditions
- Comprehensive built-in protection: Thermal shutdown, current limiting, and safe operating area protection prevent damage from overloads and short circuits
- Low quiescent current: Efficient operation with minimal wasted power at the adjust pin
- Industry-standard TO-220 package: Easy to mount on heatsinks for high-current applications; breadboard and PCB friendly
- Drop-in replacement: Compatible with LM317T, LM317HVT, and equivalent parts from major manufacturers
Why Choose the LM317 from The Engineer Store?
- 100% authentic ICs sourced directly from trusted, authorized distributors - no counterfeits
- 1-5 day shipping, 7-8 day delivery across India from our Bengaluru warehouse; same-day delivery within Bengaluru
- Expert technical support included - get help with circuit design, resistor calculations, and troubleshooting
- Thoroughly tested and inspected before dispatch
- Competitive pricing with bulk discounts for volume orders
How It Works - Basic Circuit
The LM317 uses a simple resistor-divider network to set the output voltage. Connect a fixed resistor (R1, typically 240Ohm) between the Output and Adjust pins, and a second resistor (R2) between the Adjust pin and ground. The output voltage is calculated as:
V_out = 1.25V x (1 + R2 / R1)
For best performance, add a 0.1uF ceramic capacitor at the input and a 1uF electrolytic capacitor at the output to ensure stability and reduce noise. A protection diode across the output-to-input pins is recommended when using large output capacitors.
Common Output Voltage Examples
| Desired Output | R1 | R2 |
| 3.3V | 240Ohm | 394Ohm |
| 5V | 240Ohm | 720Ohm |
| 9V | 240Ohm | 1.49kOhm |
| 12V | 240Ohm | 2.06kOhm |
Project Ideas
- Variable Benchtop Power Supply: Pair with a potentiometer in place of R2 to create a continuously adjustable power supply for your electronics workbench - output from 1.25V to 37V
- Battery Charger Circuit: Build a constant-current/constant-voltage charger for Li-ion, NiMH, or lead-acid batteries with precise voltage control
- Microcontroller Power Supply: Regulate uneven wall adapter or battery voltage down to a stable 3.3V or 5V for Arduino, ESP32, STM32, or
Frequently Asked Questions
When will I receive my order?
Products ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.
Is technical support available?
Yes, 24/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.
What is your return policy?
7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.
Buy LM317 Adjustable Voltage Regulator IC Online in India
Purchase the LM317 Adjustable Voltage Regulator IC online at The Engineer Store - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on LM317 Adjustable Voltage Regulator IC with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.
Looking to buy LM317 Adjustable Voltage Regulator IC at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.