Alternatives to Texas Instruments LM317KC
Texas Instruments LM317KC and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 LM317KCTexas Instruments | LM317KCSTexas Instruments |  LM317TGonsemi | +1more | |
|---|---|---|---|---|
| FFF Compatibility | Identical 3-pin TO-220 footprint with identical pin mapping (Pin 1: Adjust, Pin 2: Output, Pin 3: Input, Tab connected to Pin 2/Output).Identical physical dimensions and through-hole mounting profile of the TO-220 package.Identical electrical characteristics, including output configuration, load current, voltage limits, and thermal protection features. | Identical 3-pin TO-220 footprint and pinout assignments.Standard TO-220 physical package with identical through-hole dimensions.Matches or exceeds the electrical, thermal, and protection specifications of the original LM317KC. | ||
 AI Summary | LM317KC by Texas Instruments: Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-220-3. | The LM317KCS is Texas Instruments' active, RoHS-compliant direct replacement for the obsolete LM317KC. It offers identical electrical performance and the same TO-220-3 footprint, making it a perfect drop-in replacement without board redesign.
| The LM317TG from onsemi is a highly reliable second-source alternative that matches the original LM317KC in fit, form, and function. It provides a highly available option for sourcing from an alternative top-tier manufacturer.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-220-3 | Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-220-3 | Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-220 | |
| Manufacturer | Texas Instruments | Texas Instruments | onsemi | |
| Type | Power Management (PMIC) | Power Management (PMIC) | Power Management (PMIC) | |
| Datasheet | Open | Open | Open | |
| Lead Time | Unknown | 16 weeks | 12 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8542.39.0070 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| PSRR | 80dB ~ 65dB (120Hz) | - | - | |
| Output Type | Adjustable | - | - | |
| Mounting Type | Through Hole | - | - | |
| Package / Case | TO-220-3 | - | - | |
| Current - Output | 1.5A | - | - | |
| Protection Features | Over Current, Over Temperature, Short Circuit | - | - | |
| Number of Regulators | 1 | - | - | |
| Output Configuration | Positive | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 LM317Tonsemi | In stock | Obsolete | 4Alternatives availableSee Alternatives |
 LM311Monsemi | In stock | Obsolete | 4Alternatives availableSee Alternatives |
 LM311DSTMicroelectronics | In stock | Active | 5Alternatives availableSee Alternatives |
 LM319NSTMicroelectronics | Non-stock | Obsolete | 4Alternatives availableSee Alternatives |
 LM337TTexas Instruments | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
 LM385D-1.2onsemi | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The Texas Instruments LM317KC is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the Texas Instruments LM317KC are the LM317KCS (Texas Instruments) and the LM317TG (onsemi), out of 3 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the LM317KC are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The LM317KC (Texas Instruments) is a part in the Power Management (PMIC) category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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