Alternatives to onsemi FAN1117ASX
onsemi FAN1117ASX and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 FAN1117ASXonsemi |  NCP1117STAT3Gonsemi | LD1117ASTRSTMicroelectronics | +3more | |
|---|---|---|---|---|
| FFF Compatibility | The package, footprint, pin assignments (Pin 1: ADJ/GND, Pin 2/Tab: OUT, Pin 3: IN) are identical to the original FAN1117ASX, allowing for a direct drop-in replacement on existing PCBs.Housed in the identical SOT-223 surface mount package, retaining identical mechanical dimensions.Matches the adjustable output configuration, 1.25V reference voltage, and 1A output current capability, while offering a superior maximum input voltage rating of 20V (compared to 18V). | Features the identical pinout (Pin 1: ADJ/GND, Pin 2/Tab: OUT, Pin 3: IN) and package footprint as the original device.Housed in the standard SOT-223 package, fitting the same mechanical profile.The maximum input voltage rating is 15V, which is lower than the original 18V rating. However, it meets or exceeds all other electrical parameters and offers a wider temperature range. | ||
 AI Summary | FAN1117ASX by onsemi: Linear Voltage Regulator IC Positive Adjustable 1 Output 1A SOT-223-4. | This is the primary recommended drop-in alternative from onsemi, offering the same 1A current capacity, identical SOT-223 pinout, and a slightly higher input voltage limit of 20V. An industrial-grade variant with a wider temperature range (-40°C to 125°C) is also available under the MPN NCP1117ISTAT3G.
| This is a highly reliable alternative from STMicroelectronics that supports the full 1A output current and extends the low-end operating temperature down to -40°C. Note that the maximum input voltage is reduced from 18V to 15V.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Linear Voltage Regulator IC Positive Adjustable 1 Output 1A SOT-223-4 | Linear Voltage Regulator IC Positive Adjustable 1 Output 1A SOT-223 | Linear Voltage Regulator IC Positive Adjustable 1 Output 1A SOT-223 | |
| Manufacturer | onsemi | onsemi | STMicroelectronics | |
| Type | Power Management (PMIC) | Power Management (PMIC) | Power Management (PMIC) | |
| Datasheet | Open | Open | Open | |
| Lead Time | 42 weeks | 9 weeks | 30 weeks | |
| Country of Origin | TW | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8542.39.0070 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| PSRR | 72dB (120Hz) | - | - | |
| Output Type | Adjustable | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Package / Case | TO-261-4, TO-261AA | - | - | |
| Current - Output | 1A | - | - | |
| Protection Features | Over Current, Over Temperature | - | - | |
| Number of Regulators | 1 | - | - | |
| Output Configuration | Positive | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 FAN1616ADXonsemi | In stock | Obsolete | 5Alternatives availableSee Alternatives |
| FAN1587AD15Xonsemi | In stock | Obsolete | 6Alternatives availableSee Alternatives |
 FAN1589MXonsemi | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi FAN1117ASX 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 FAN1117ASX are the NCP1117STAT3G (onsemi) and the LD1117ASTR (STMicroelectronics), out of 5 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 FAN1117ASX 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 FAN1117ASX (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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