Alternatives to onsemi LM317T
onsemi LM317T and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 LM317Tonsemi |  LM317TGonsemi | LM317BTGonsemi | +2more | |
|---|---|---|---|---|
| FFF Compatibility | Features the exact same TO-220-3 package and pin layout (Pin 1: Adjust, Pin 2: Vout, Pin 3: Vin, Tab: Vout) as the original part.Standard TO-220 package dimension and through-hole mounting profile match the original part exactly.Fully meets or exceeds all electrical performance characteristics including 1.5A output, adjustable 1.2V to 37V voltage range, and 40V max input. | Features the identical TO-220 package and pin assignments (Adjust, Vout, Vin) as the original LM317T.Maintains the exact same mechanical body and lead dimensions as the original part.Exceeds the original specifications by offering a wider temperature operating range (-40°C to 125°C vs 0°C to 125°C) while matching all other parameters. | ||
 AI Summary | LM317T by onsemi: Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-220-3. | The LM317TG is onsemi's direct lead-free (RoHS compliant) replacement for the obsolete LM317T. It features identical electrical specs, pin assignments, and physical dimensions, allowing for a seamless drop-in replacement with no design changes.
| The LM317BTG is an upgraded industrial-grade sibling from the same manufacturer family. It offers an extended operating temperature range of -40°C to +125°C, making it more robust for harsh environments while remaining physically and electrically identical.
| |
| 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 | Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-220 | |
| Manufacturer | onsemi | onsemi | onsemi | |
| Type | Power Management (PMIC) | Power Management (PMIC) | Power Management (PMIC) | |
| Datasheet | Open | Open | Open | |
| Lead Time | 11 weeks | 12 weeks | 9 weeks | |
| Country of Origin | KR | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8542.39.0070 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| PSRR | 75dB ~ 60dB (120Hz) | - | - | |
| Output Type | Adjustable | - | - | |
| Mounting Type | Through Hole | - | - | |
| Package / Case | TO-220-3 | - | - | |
| Current - Output | 1.5A | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 LM339Nonsemi | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi LM317T 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 onsemi LM317T are the LM317TG (onsemi) and the LM317BTG (onsemi), out of 4 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Yes. The leading alternatives to the LM317T are fit-, form- and function-compatible — the same package and pinout with matching key electrical specifications — so they drop in without PCB changes. Always confirm the parameters critical to your design against the alternative's datasheet before committing.
The LM317T (onsemi) 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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