LM317AT/NOPB Part Information

Details for LM317AT/NOPB by Texas Instruments

Semiconductors - ICs>Power Management ICs - PMIC>Voltage Regulators

Part Description

The LM317A adjustable 3-terminal, positive-voltage regulators are capable of supplying current in excess of 1.5 A over a 1.25-V to 37-V output range and provide 1% output-voltage accuracy. The LM317A device is available in an SOT-223 package, which makes it ideal for space-constrained applications that require high-performance regulation. The device is exceptionally easy to use and requires only two external resistors to set the output voltage. Both line regulation and load regulation are better achieved with the LM317A device than with standard fixed regulators. The LM317A offers full overload protection such as current limit, thermal-overload protection, and safearea protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple-rejection ratios that are difficult to achieve with standard 3-terminal regulators. Because the LM317A regulator is floating and detects only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. Exceeding the maximum input-to-output deferential will result in short-circuiting the output. By connecting a fixed resistor between the adjustment pin and output, the LM317A can be also used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground, which programs the output to 1.25 V where most loads draw little current. For applications requiring greater output current, see data sheets for LM150 series (3A), SNVS772, and LM138 series (5A), SNVS771. For the negative complement, see LM137 (SNVS778) series data sheet.

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Part Features

  • 1% Output Voltage Tolerance
  • 1.5-A Output Current
  • 80-dB Ripple Rejection
  • Adjustable Output Down to 1.25 V
  • Current Limit Constant with Temperature
  • Short-Circuit Protected Output
  • Typical 0.005%/V Line Regulation
  • u221240u00b0C to 125u00b0C Operating Temperature Range

Part Specifications

Fixed Output Voltage Nom. -
Adjustable Output Voltage Min 1.2V
Adjustable Output Voltage Max 37V
Input Voltage Min 4.2V
Input Voltage Max 40V
Product Range LM117
Output Current 1.5A
Output Type Adjustable
Linear Regulator Case Style TO-220
No. of Pins 3Pins
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Automotive Qualification Standard -
MSL -
SVHC No SVHC (27-Jun-2018)
Accuracy % 1%
No. of Outputs 1Outputs
Operating Temperature Range -40°C to +125°C
Output Voltage Adjustable Range 1.2V to 37V
Output Voltage Max 37V
Output Voltage Min 1.2V
Primary Input Voltage 40V
Supply Voltage Min 3V
Termination Type Through Hole
Voltage Regulator Type Adjustable Positive
RoHS Compliant

Alternative Part Descriptions

  • ADJUSTABLE LINEAR REGULATOR, 1.2V TO 37V, TO-220; Fixed Output Voltage Nom.:-; Adjustable Output Voltage Min:1.2V; Adjustable Output Voltage Max:37V; Input Voltage Min:4.2V; Input Voltage Max:40V; Product Range:-; Output Current:1.5ARoHS Compliant: Yes | Newark Electronics
  • IC: voltage regulator; linear,adjustable; 1.2÷37V; 1.5A; TO220 | Transfer Multisort Elektronik
  • 1.5-A, 40-V, adjustable linear voltage regulator with high-accuracy | Texas Instruments
  • Linear voltage regulator [Texas Instruments] LM317AT/NOPB Linear voltage regulator | Distrelec

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What category does LM317AT/NOPB fall under?

The LM317AT/NOPB is listed under Semiconductors - ICs > Power Management ICs - PMIC > Voltage Regulators.

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You can view similar parts to LM317AT/NOPB when available in the Voltage Regulators range under the specifications section at the bottom of the details page.

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Is the LM317AT/NOPB RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Farnell.

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