Alternatives to Microchip Technology LR645N3
Microchip Technology LR645N3 and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
| LR645N3Microchip Technology |  LR645N3-GMicrochip Technology | LR8N3-GMicrochip Technology | +1more | |
|---|---|---|---|---|
| FFF Compatibility | Identical pin assignments (Pin 1: VIN, Pin 2: GND, Pin 3: VOUT) in standard TO-92.Same physical TO-92 through-hole package dimensions.Identical electrical parameters (10V output, 3mA continuous current, 15V to 450V input range). | Both utilize the TO-92-3 footprint, but Pin 2 is ADJ instead of GND, requiring external resistor divider network connections.Same physical TO-92 package and through-hole mounting style.Can be configured to output 10V (adjustable range 1.2V to 440V) and supports a higher current capability. | ||
 AI Summary | LR645N3 by Microchip Technology: Linear Voltage Regulator IC Positive Fixed 1 Output 3mA TO-92-3. | This is the direct lead-free (RoHS compliant) drop-in replacement for the obsolete LR645N3. It offers identical electrical parameters, physical package, and pinout, making it the safest and easiest transition choice.
| An adjustable high-voltage linear regulator in the same TO-92 package. It can be set to 10V using external feedback resistors, serving as a robust alternative with a higher current rating.
| |
| 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 Fixed 1 Output 3mA TO-92-3 | Linear Voltage Regulator IC Positive Fixed 1 Output 3mA TO-92-3 | Linear Voltage Regulator IC Positive Adjustable 1 Output 10mA TO-92-3 | |
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | |
| Type | Power Management (PMIC) | Power Management (PMIC) | Power Management (PMIC) | |
| Datasheet | Open | Open | Open | |
| Lead Time | 7 weeks | 10 weeks | 4 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8542.39.0060 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| PSRR | 60dB (120Hz) | - | - | |
| Output Type | Fixed | - | - | |
| Mounting Type | Through Hole | - | - | |
| Package / Case | TO-226-3, TO-92-3 (TO-226AA) | - | - | |
| Current - Output | 3mA | - | - | |
| Number of Regulators | 1 | - | - | |
| Output Configuration | Positive | - | - | |
| Operating Temperature | -55°C ~ 155°C | - | - |
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Frequently asked questions
Yes. The Microchip Technology LR645N3 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 Microchip Technology LR645N3 are the LR645N3-G (Microchip Technology) and the LR8N3-G (Microchip Technology), 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 LR645N3 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 LR645N3 (Microchip Technology) 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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