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Product InformationFeatures
PowerFLEX, PowerPAD are trademarks of Texas Instruments. DESCRIPTION/ORDERING INFORMATIONThe LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It is exceptionally easy to use and requires only two external resistors to set the output voltage. Furthermore, both line and load regulation are better than standard fixed regulators. In addition to having higher performance than fixed regulators, this device includes on-chip current limiting, thermal overload protection, and safe operating-area protection. All overload protection remains fully functional, even if the ADJUST terminal is disconnected. The LM317 is versatile in its applications, including uses in programmable output regulation and local on-card regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the LM317 can function as a precision current regulator. An optional output capacitor can be added to improve transient response. The ADJUST terminal can be bypassed to achieve very high ripple-rejection ratios, which are difficult to achieve with standard three-terminal regulators. |
| Price | Packaging | CAD Design Tools | Samples | |||||||
| Device | Status | Temp (oC) | Replaced By | Price | Quantity | Package | Pins | Top Side Marking | Package QTY | Package Carrier | Symbols | Footprints | Samples |
| LM317DCY | ACTIVE | 0 to 125 | 0.40 | 1ku | SOT-223 (DCY) | 4 | View | 80 | TUBE | Contact TI Distributor or Sales Office | |||
| LM317DCYG3 | ACTIVE | 0 to 125 | 0.40 | 1ku | SOT-223 (DCY) | 4 | View | 80 | TUBE | Contact TI Distributor or Sales Office | |||
| LM317DCYR | ACTIVE | 0 to 125 | 0.36 | 1ku | SOT-223 (DCY) | 4 | View | 2500 | LARGE T&R | Contact TI Distributor or Sales Office | |||
| LM317DCYRG3 | ACTIVE | 0 to 125 | 0.36 | 1ku | SOT-223 (DCY) | 4 | View | 2500 | LARGE T&R | Contact TI Distributor or Sales Office | |||
| LM317KC | OBSOLETE | 0 to 125 | LM317KCS | 0.45 | 1ku | TO-220 (KC) | 3 | View | Replaced by LM317KCS | |||
| LM317KCE3 | OBSOLETE | 0 to 125 | 0.45 | 1ku | TO-220 (KC) | 3 | View | Not Available | ||||
| LM317KCS | ACTIVE | 0 to 125 | 0.38 | 1ku | TO-220 (KCS) | 3 | 50 | TUBE | Contact TI Distributor or Sales Office | ||||
| LM317KCSE3 | ACTIVE | 0 to 125 | 0.38 | 1ku | TO-220 (KCS) | 3 | 50 | TUBE | Contact TI Distributor or Sales Office | ||||
| LM317KTER | OBSOLETE | 0 to 125 | 0.49 | 1ku | (KTE) | 3 | Not Available | |||||
| LM317KTTR | ACTIVE | 0 to 125 | 0.36 | 1ku | DDPAK/TO-263 (KTT) | 3 | View | 500 | LARGE T&R | ||||
| LM317KTTRG3 | ACTIVE | 0 to 125 | 0.36 | 1ku | DDPAK/TO-263 (KTT) | 3 | View | 500 | LARGE T&R | ||||
* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.
| Reported Distributor Inventory as of 11:58 AM GMT, 26 Nov 2009 | |||
| Region | Company | In Stock | Purchase |
| TI Lead Time*: 12 WeeksLM317DCY | |||
| Americas | Arrow | >1k | |
| Avnet | >1k | ||
| Newark | 638 | ||
| Rochester Electronics | >1k | ||
| Europe | Abacus Polar | >1k | |
| Worldwide | DigiKey | 329 | |
| Mouser Electronics | 135 | ||
| TI Lead Time*: 12 WeeksLM317DCYG3 | |||
| Americas | Avnet | 780 | |
| Rochester Electronics | >1k | ||
| Worldwide | DigiKey | Available | |
| TI Lead Time*: 12 WeeksLM317DCYR | |||
| Americas | Arrow | 337 | |
| Newark | >1k | ||
| Rochester Electronics | >1k | ||
| Asia | WPI | >1k | |
| Worldwide | DigiKey | >1k | |
| TI Lead Time*: 12 WeeksLM317DCYRG3 | |||
| Americas | Arrow | >1k | |
| Worldwide | DigiKey | Available | |
| Call**LM317KC | |||
| Americas | Rochester Electronics | >1k | |
| Asia | WPI | 100 | |
| TI Lead Time*: 12 WeeksLM317KCS | |||
| Americas | Arrow | 1k | |
| Avnet | 1k | ||
| Rochester Electronics | >1k | ||
| Worldwide | DigiKey | 111 | |
| Mouser Electronics | >1k | ||
| TI Lead Time*: 12 WeeksLM317KCSE3 | |||
| Asia | WPI | 400 | |
| Europe | EBV Elektronik | 50 | |
| Worldwide | DigiKey | Available | |
| Mouser Electronics | >1k | ||
| Call**LM317KTER | |||
| Americas | Rochester Electronics | >1k | |
| TI Lead Time*: 12 WeeksLM317KTTR | |||
| Americas | Arrow | 500 | |
| Newark | >1k | ||
| Asia | Farnell Asia | >1k | |
| WPI | 119 | ||
| Europe | Avnet-SILICA | >1k | |
| Worldwide | DigiKey | 469 | |
| Mouser Electronics | 999 | ||
| TI Lead Time*: 12 WeeksLM317KTTRG3 | |||
| Worldwide | DigiKey | Available | |
| Mouser Electronics | >1k | ||
** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.
| Product Content | DPPM / MTBF / FIT Rate | ||||
| Device | Eco Plan* | Lead / Ball Finish | MSL Rating / Peak Reflow | Details | Details |
| LM317DCY | Green (RoHS & no Sb/Br) | CU SN | Level-2-260C-1 YEAR | View | View |
| LM317DCYG3 | Green (RoHS & no Sb/Br) | CU SN | Level-2-260C-1 YEAR | View | View |
| LM317DCYR | Green (RoHS & no Sb/Br) | CU SN | Level-2-260C-1 YEAR | View | View |
| LM317DCYRG3 | Green (RoHS & no Sb/Br) | CU SN | Level-2-260C-1 YEAR | View | View |
| LM317KCS | Pb-Free (RoHS) | CU SN | N/A for Pkg Type | View | View |
| LM317KCSE3 | Pb-Free (RoHS) | CU SN | N/A for Pkg Type | View | View |
| LM317KTTR | Green (RoHS & no Sb/Br) | CU SN | Level-3-245C-168 HR | View | View |
| LM317KTTRG3 | Green (RoHS & no Sb/Br) | CU SN | Level-3-245C-168 HR | View | View |
* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.
If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.
Most useful technical documents for LM317 
View Application Notes for Standard Voltage Regulators
| Part # | Name | Product Family | Comments |
| LM317L | 3/8 Pin 100mA Adjustable Positive Regulator | LINEAR REGULATORS - STANDARD VOLTAGE REGULATORS | The LM317L is very similar to the LM317 but LM317L has and output current of 100 mA. |
| LM317M | 3/4 Pin 500mA Adjustable Positive Voltage Regulator | LINEAR REGULATORS - STANDARD VOLTAGE REGULATORS | The LM317M is very similar to the LM317 but LM317M has an output current of 500 mA. |
| TL317 | 3/8 Pin 100mA Adjustable Positive Voltage Regulator | LINEAR REGULATORS - STANDARD VOLTAGE REGULATORS | The TL317 has a low voltage dropout. |
| UA7805 | 3 Pin 1.5A Fixed 5V Positive Voltage Regulator | LINEAR REGULATORS - STANDARD VOLTAGE REGULATORS | UA780x offers only fixed voltage options and does not have the same specification as the LM317. |
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