Texas Instruments LM317 Adjustable Positive Voltage Regulator, 1A, SOT-223
TI LM317 adjustable positive voltage regulator (1.2-37V, 1A) in SOT-223 package. Features overload protection & high ripple rejection.
The Texas Instruments LM317EMP/NOPB is a highly versatile three-terminal adjustable positive voltage regulator, presented in a compact 4-pin SOT-223 surface-mount package. This regulator is exceptionally user-friendly, requiring only two external resistors to set the desired output voltage, making it ideal for both prototyping and production applications. It offers superior line and load regulation compared to standard fixed regulators, ensuring a stable and reliable output under varying conditions.
Beyond performance, the LM317 provides comprehensive overload protection typically only found in integrated circuits. This includes current limiting, thermal overload protection, and safe area protection. Crucially, all this protection circuitry remains fully operational even if the adjustment terminal is disconnected, enhancing the safety and robustness of your designs. For most installations, input and output capacitors are optional; an input bypass is only needed if the device is situated more than six inches from the input filter capacitors, while an output capacitor can be added to improve transient response.
A key feature is the adjustable output voltage, which can be precisely set from 1.2V to 37V, with a maximum output current of 1A. It accepts an input voltage range from 4.2V to 40V, with a typical dropout voltage of 2.25V. The regulator also boasts an impressive 80dB ripple rejection ratio, which can be further improved by bypassing the adjustment terminal—a feature difficult to achieve with standard three-terminal regulators. The output is short-circuit protected, and the device operates reliably across a temperature range of 0°C to 125°C.
With its combination of adjustability, robust protection, and high performance, the LM317 is a cornerstone component for a wide array of electronic power management tasks, from simple voltage references to complex power supply units.
- Power management systems
- Adjustable bench power supplies
- Voltage reference circuits
- Battery-powered device regulation
- IC Type: LM317EMP/NOPB
- Terminals: 3 (Adjustable Positive)
- Package: 4-pin SOT-223 (Surface Mount)
- Output Voltage Range: 1.2V to 37V
- Max Output Current: 1A
- Input Voltage Range: 4.2V to 40V
- Dropout Voltage: Typically 2.25V
- Ripple Rejection Ratio: 80dB
- Regulation: Superior line and load regulation vs. fixed regulators
- Protection Features: Current limit, thermal overload, safe area, short circuit
- Operating Temperature Range: 0°C to 125°C
- External Components: Requires only two resistors to set voltage
- Dimensions: 43mm (H) x 33mm (W) x 15mm (D)
- Weight: 0.505 grams
- of Outputs: 1Outputs
- Output Voltage Min: 1.2V
- Output Voltage Max: 37V
- Input Voltage Min: 4.2V
- Input Voltage Max: 40V
- Product Range: LM117; LM317N
- Output Current Max: 1A
- IC Case / Package: 0
- of Pins: 4Pins
- IC Mounting: Surface Mount
- Operating Temperature Min: 0°C
- Operating Temperature Max: 125°C
- SVHC: No SVHC (27-Jun-2018)
Always follow local regulations and product guidance.
Free standard delivery on UK mainland orders. Express delivery options and international shipping available at checkout.
We offer a 30-day money-back guarantee on most products. For faulty items, contact us within 14 days for a replacement or refund.
View Full Delivery & Returns PolicySecure Transactions
We take the utmost care with your payment and personal details. Our website employs advanced encryption technology, including Secure Sockets Layer (SSL), to protect your information during transmission. You can verify a secure connection by looking for 'https' and a locked padlock in your browser.
Cookie Policy
Cookies enhance your shopping experience by keeping track of your basket and remembering you when you return. We also use banner advertising based on your browsing history to present products of potential interest.
Security Warning
Beware of phishing scams! We will never ask for personal details via email. If such information is required, we'll request you to contact us by phone. If you receive an email requesting sensitive information, do not respond and let us know immediately.
Similar Products
You may like
