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Datasheet Texas Instruments LM317A

Datasheet Texas Instruments LM317A

ManufacturerTexas Instruments

1% Accurate, 1.5A Adjustable Linear Regulator with Short Circuit Protection


  • Download » Datasheet PDF, 4.8 Mb, File published: Oct 30, 2015
    LM317A 1% Accurate Three-Terminal Adjustable Regulator datasheet
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    SNVSAC2 – MARCH 2015 – REVISED OCTOBER 2015 LM317A 1% Accurate Three-Terminal Adjustable Regulator
    1 Features 3 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. 1 Typical 0.005%/V Line Regulation
    1% Output Voltage Tolerance
    1.5-A Output Current
    Adjustable Output Down to 1.25 V
    Current Limit Constant with Temperature ...


Family: LM317A


Lifecycle StatusNRND (Not recommended for new designs)Active (Recommended for new designs)NRND (Not recommended for new designs)Active (Recommended for new designs)Active (Recommended for new designs)Active (Recommended for new designs)NRND (Not recommended for new designs)Active (Recommended for new designs)NRND (Not recommended for new designs)Active (Recommended for new designs)NRND (Not recommended for new designs)Active (Recommended for new designs)
Manufacture's Sample AvailabilityNoNoNoYesNoNoNoYesYesYesNoNo


Industry STD TermSOT-223SOT-223SOT-223SOT-223TO-CANTO-CANTO-252TO-252TO-252TO-252TO-220TO-220
Package QTY10001000200020005005007575250025004545
Width (mm)
Length (mm)
Thickness (mm)
Pitch (mm)
Max Height (mm)
Mechanical DataDownload »Download »Download »Download »Download »Download »Download »Download »Download »Download »Download »Download »


Accuracy, %55555555555
Approx. Price (US$)0.61 | 1ku
Iout(Max), A1.
Iq(Typ), mA0.
Noise, uVrms3838383838383838383838
Operating Temperature Range, C-40 to 125-40 to 125-40 to 125-40 to 125-40 to 125-40 to 125-40 to 125-40 to 125-40 to 125-40 to 125-40 to 125
Operating Temperature Range(C)-40 to 125
Output Capacitor TypeNon-CeramicNon-CeramicNon-CeramicNon-CeramicNon-CeramicNon-CeramicNon-CeramicNon-CeramicNon-CeramicNon-CeramicNon-CeramicNon-Ceramic
Output OptionsAdjustable OutputAdjustable OutputAdjustable OutputAdjustable OutputAdjustable OutputAdjustable OutputAdjustable OutputAdjustable OutputAdjustable OutputAdjustable OutputAdjustable OutputAdjustable Output
PSRR @ 100KHz, dB4040404040404040404040
PSRR @ 100KHz(dB)40
Package GroupSOT-223SOT-223SOT-223SOT-223TOTOTO-252TO-252TO-252TO-252TO-220TO-220
Package Size: mm2:W x L, PKG4SOT-223: 46 mm2: 7 x 6.5(SOT-223)4SOT-223: 46 mm2: 7 x 6.5(SOT-223)4SOT-223: 46 mm2: 7 x 6.5(SOT-223)4SOT-223: 46 mm2: 7 x 6.5(SOT-223)3TO: 92 mm2: 9.14 x 10.03(TO)3TO-252: 40 mm2: 6.1 x 6.58(TO-252)3TO-252: 40 mm2: 6.1 x 6.58(TO-252)3TO-252: 40 mm2: 6.1 x 6.58(TO-252)3TO-252: 40 mm2: 6.1 x 6.58(TO-252)See datasheet (TO-220)See datasheet (TO-220)
Package Size: mm2:W x L (PKG)See datasheet (TO-220)
Regulated Outputs11111111111
Regulated Outputs(#)1
Special FeaturesN/A
Thermal Resistance ОёJA, В°C/W2424242424242424242424
Thermal Resistance ОёJA(В°C/W)24
Vdo(Typ), mV22502250225022502250225022502250225022502250
Vin(Max), V4040404040404040404040
Vin(Min), V4.
Vout(Max), V3737373737373737373737
Vout(Min), V1.

Eco Plan

RoHSSee ti.comCompliantSee ti.comCompliantCompliantCompliantSee ti.comCompliantSee ti.comCompliantSee ti.comCompliant
Pb FreeYesYes

Application Notes

  • Download » Application Notes PDF, 104 Kb, File published: Oct 3, 2002
    Adjustable 3-Terminal Regulator for Low-Cost Battery Charging Systems
  • Download » Application Notes PDF, 82 Kb, Revision: B, File published: May 5, 2013
    AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B)
    This application report discusses improving power supply reliability with IC power regulators.
  • Download » Application Notes PDF, 314 Kb, Revision: B, File published: May 5, 2013
    AN-181 3-Terminal Regulator is Adjustable (Rev. B)
    Until now all of the 3-terminal power IC voltage regulators have a fixed output voltage. In spite of this limitation their ease of use low cost and full on-chip overload protection have generated wide acceptance. Now with the introduction of the LM117 it is possible to use a single regulator for any output voltage from 1.2 V to 37 V at 1.5A. Selecting close-tolerance outp
  • Download » Application Notes PDF, 684 Kb, Revision: B, File published: May 6, 2013
    AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B)
    The purpose of this application report is to aid the user in maximizing the power handling capability of Texas Instruments power packages by using the SOT-223 as an example.
  • Download » Application Notes PDF, 284 Kb, Revision: A, File published: May 5, 2013
    Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A)
    When working with voltage regulator circuits the designer is often confronted with the need to calculatethe tolerance of the regulated output voltage. For fixed voltage regulators this problem is easily managedbecause the required information is directly supplied on the semiconductor manufacturer's data sheet.
  • Download » Application Notes PDF, 814 Kb, Revision: A, File published: May 6, 2013
    AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A)
    The LM340-XX are three terminal 1.0A positive voltage regulators with preset output voltages of 5.0V or15V. The LM340 regulators are complete 3-terminal regulators requiring no external components fornormal operation. However by adding a few parts one may improve the transient response provide for avariable output voltage or increase the output current. Included on the chip are all of t
  • Download » Application Notes PDF, 300 Kb, Revision: B, File published: May 6, 2013
    AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B)
    This application note discusses the operation and compensation of linear regulators.
  • Download » Application Notes PDF, 197 Kb, File published: Oct 21, 1999
    Understanding the Terms and Definitions of LDO Voltage Regulators
    This report provides an understanding of the terms and definitions of low dropout (LDO) voltage regulators and describes fundamental concepts including dropout voltage quiescent current standby current efficiency transient response line/load regulation power supply rejection output noise voltage accuracy and power dissipation. Each section includes an example to increase the understandab
  • Download » Application Notes PDF, 509 Kb, Revision: A, File published: Jun 4, 2008
    Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A)
  • Download » Application Notes PDF, 75 Kb, File published: May 8, 2010
    Packaging Limits Range of Linear Regulators
    The power limitations of the physical packaging for a linear regulator device can limit the total output current or the input-to-output voltage differential. This inherent limitation is not always apparent from the product data sheet and must be evaluated during the design phase. This application note shows how the package can limit the operating envelope of a linear regulator.
  • Download » Application Notes PDF, 79 Kb, Revision: E, File published: Feb 12, 2015
    A Topical Index of TI LDO Application Notes (Rev. E)

Moldel Line

Series: LM317A (12)

Manufacturer's Classification

  • Semiconductors > Analog and Mixed-Signal > Power Management > Linear Regulator (LDO) > Single Channel LDO

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