Overview
Information | 1.0A Low Dropout Voltage Regulator |
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Output Option | Fixed |
VOUT (V) | 2.5, 3.3, 5.0 |
VOUT Adj MIN (V) | - |
VOUT Adj MAX (V) | - |
IOUT (mA) | 1000 |
VIN MIN (V) | 3.1 |
VIN MAX (V) | 16 |
IQ (µA) | 18000 |
Accuracy (%) | 2% |
Vdrop (mV) | 280 |
Output Noise (µVRMS) | 260 |
PSRR (dB) | - |
Junction Temp Range (°C) | -40 to 125 |
Package | SOT223-3, TO263-3 |
Features | Reverse battery protection, Current limit and thermal protection |
The SPX3940 is a 1A, accurate voltage regulator with a low drop out voltage of 280mV (typical) at 1A.
These regulators are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. They are fully fault protected against overcurrent, reverse battery and positive and negative voltage transients.
The SPX3940 is offered in 3-pin SOT-223 and TO-263 packages. For a 3A version, refer to the SPX29300 datasheet.
- 1% output accuracy SPX3940A
- Guaranteed 1.5A peak current
- Low quiescent current
- Low dropout voltage of 280mV at 1A
- Extremely tight load and line regulation
- Extremely fast transient response
- Reverse battery protection
- Internal short-circuit current limit
- Replacement for LM3940
Documentation & Design Tools
Type | Title | Version | Date | File Size |
---|---|---|---|---|
Data Sheets | SPX3940 1A Low Dropout Voltage Regulator | 1.0.1 | July 2023 | 1.1 MB |
Application Notes | AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian | April 2019 | 1.2 MB | |
Product Brochures | Power Management Brochure | May 2024 | 7.1 MB | |
Product FAQs | SPX3940 FAQ | 1.0.0 | October 2006 | 169.8 KB |
Symbols & Footprints | SPX3940AM3-L-3-3 and SPX3940AM3-L-3-3/TR CAD File (.bxl) | September 2018 | 24.9 KB | |
Symbols & Footprints | SPX3940AM3-L-5-0/TR CAD File (.bxl) | September 2018 | 24.9 KB | |
Symbols & Footprints | SPX3940AT-L-3-3/TR CAD File (.bxl) | September 2018 | 17.7 KB | |
Symbols & Footprints | SPX3940M3-L-2-5/TR CAD File (.bxl) | September 2018 | 24.9 KB | |
Symbols & Footprints | SPX3940M3-L-5-0/TR CAD File (.bxl) | September 2018 | 24.9 KB | |
Symbols & Footprints | SPX3940T-L-3-3/TR CAD File (.bxl) | September 2018 | 17.7 KB |
Quality & RoHS
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | TSCA | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|---|
SPX3940AM3-L-3-3 | N | Y | Y | Y | Y | L1 / 260ᵒC | SOT-223-3 |
SPX3940AM3-L-3-3/TR | N | Y | Y | Y | Y | L1 / 260ᵒC | SOT-223-3 |
SPX3940AM3-L-5-0/TR | N | Y | Y | Y | Y | L1 / 260ᵒC | SOT-223-3 |
SPX3940M3-L-5-0/TR | N | Y | Y | Y | Y | L1 / 260ᵒC | SOT-223-3 |
SPX3940M3-L-2-5/TR | N | Y | Y | Y | Y | L1 / 260ᵒC | SOT-223-3 |
SPX3940AT-L-3-3/TR | N | Y | Y | Y | Y | L3 / 245ᵒC | TO-263-3 |
SPX3940T-L-3-3/TR | N | Y | Y | Y | Y | L3 / 245ᵒC | TO-263-3 |
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Parts & Purchasing
Part Number | Pkg Code | Min Temp | Max Temp | Status | Suggested Replacement | Buy Now | Order Samples | PDN |
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SPX3940AM3-1-8 | SOT-223-3 | OBS | ||||||
SPX3940AM3-1-8/TR | SOT-223-3 | OBS | ||||||
SPX3940AM3-2-5 | SOT-223-3 | OBS | ||||||
SPX3940AM3-2-5/TR | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940AM3-3-3 | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940AM3-3-3/TR | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940AM3-5-0 | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940AM3-5-0/TR | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940AM3-L-1-8 | SOT-223-3 | -40 | 125 | OBS | SPX3940AM3-L-1-8/TR | |||
SPX3940AM3-L-1-8/TR | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940AM3-L-2-5 | SOT-223-3 | -40 | 125 | OBS | SPX3940AM3-L-2-5/TR | |||
SPX3940AM3-L-2-5/TR | SOT-223-3 | -40 | 125 | OBS | SPX3940M3-L-2-5/TR | |||
SPX3940AM3-L-3-3 | SOT-223-3 | -40 | 125 | OBS | SPX3940AM3-L-3-3/TR | |||
SPX3940AM3-L-3-3/TR | SOT-223-3 | -40 | 125 | Active | Order | |||
SPX3940AM3-L-5-0 | SOT-223-3 | -40 | 125 | OBS | SPX3940AM3-L-5-0/TR | |||
SPX3940AM3-L-5-0/TR | SOT-223-3 | -40 | 125 | Active | Order | |||
SPX3940AT-1-8 | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940AT-1-8/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940AT-2-5 | TO-263-3 | OBS | ||||||
SPX3940AT-2-5/TR | TO-263-3 | OBS | ||||||
SPX3940AT-3-3 | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940AT-3-3/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940AT-5-0 | TO-263-3 | OBS | ||||||
SPX3940AT-5-0/TR | TO-263-3 | OBS | ||||||
SPX3940AT-L-1-8 | TO-263-3 | -40 | 125 | OBS | SPX3940AT-L-1-8/TR | |||
SPX3940AT-L-1-8/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940AT-L-2-5 | TO-263-3 | -40 | 125 | OBS | SPX3940AM3-L-2-5 | |||
SPX3940AT-L-2-5/TR | TO-263-3 | -40 | 125 | OBS | SPX3940AM3-L-2-5/TR | |||
SPX3940AT-L-3-3 | TO-263-3 | -40 | 125 | OBS | SPX3940AT-L-3-3/TR | |||
SPX3940AT-L-3-3/TR | TO-263-3 | -40 | 125 | Active | Order | |||
SPX3940AT-L-5-0 | TO-263-3 | -40 | 125 | OBS | SPX3940AT-L-5-0/TR | |||
SPX3940AT-L-5-0/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940AU-1-8 | TO-220-3 | OBS | ||||||
SPX3940AU-2-5 | TO-220-3 | OBS | ||||||
SPX3940AU-3-3 | TO-220-3 | OBS | ||||||
SPX3940AU-5-0 | TO-220-3 | OBS | ||||||
SPX3940AU-L-1-8 | TO-220-3 | OBS | ||||||
SPX3940AU-L-2-5 | TO-220-3 | OBS | ||||||
SPX3940AU-L-3-3 | TO-220-3 | OBS | ||||||
SPX3940AU-L-5-0 | TO-220-3 | -40 | 125 | OBS | ||||
SPX3940M3-1-8 | SOT-223-3 | OBS | ||||||
SPX3940M3-1-8/TR | SOT-223-3 | OBS | ||||||
SPX3940M3-2-5 | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940M3-2-5/TR | SOT-223-3 | OBS | ||||||
SPX3940M3-3-3 | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940M3-3-3/TR | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940M3-5-0 | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940M3-5-0/TR | SOT-223-3 | -40 | 125 | OBS | ||||
SPX3940M3-L-1-8 | SOT-223-3 | -40 | 125 | OBS | SPX3940AM3-L-1-8 | |||
SPX3940M3-L-1-8/TR | SOT-223-3 | -40 | 125 | OBS | SPX3940AM3-L-1-8/TR | |||
SPX3940M3-L-2-5 | SOT-223-3 | -40 | 125 | OBS | SPX3940M3-L-2-5/TR | |||
SPX3940M3-L-2-5/TR | SOT-223-3 | -40 | 125 | Active | Order | |||
SPX3940M3-L-3-3 | SOT-223-3 | -40 | 125 | OBS | SPX3940AM3-L-3-3/TR | |||
SPX3940M3-L-3-3/TR | SOT-223-3 | -40 | 125 | OBS | SPX3940AM3-L-3-3/TR | |||
SPX3940M3-L-5-0 | SOT-223-3 | -40 | 125 | OBS | SPX3940M3-L-5-0/TR | |||
SPX3940M3-L-5-0/TR | SOT-223-3 | -40 | 125 | Active | Order | |||
SPX3940T-1-8 | TO-263-3 | OBS | ||||||
SPX3940T-1-8/TR | TO-263-3 | OBS | ||||||
SPX3940T-2-5 | TO-263-3 | OBS | ||||||
SPX3940T-2-5/TR | TO-263-3 | OBS | ||||||
SPX3940T-3-3 | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940T-3-3/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940T-5-0 | TO-263-3 | OBS | ||||||
SPX3940T-5-0/TR | TO-263-3 | OBS | ||||||
SPX3940T-L-1-8 | TO-263-3 | -40 | 125 | OBS | SPX3940AM3-L-1-8 | |||
SPX3940T-L-1-8/TR | TO-263-3 | -40 | 125 | OBS | SPX3940AM3-L-1-8/TR | |||
SPX3940T-L-2-5 | TO-263-3 | -40 | 125 | OBS | SPX3940AM3-L-2-5 | |||
SPX3940T-L-2-5/TR | TO-263-3 | -40 | 125 | OBS | SPX3940AM3-L-2-5/TR | |||
SPX3940T-L-3-3 | TO-263-3 | -40 | 125 | OBS | SPX3940T-L-3-3/TR | |||
SPX3940T-L-3-3/TR | TO-263-3 | -40 | 125 | Active | Order | |||
SPX3940T-L-5-0 | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940T-L-5-0/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX3940U-1-8 | TO-220-3 | OBS | ||||||
SPX3940U-2-5 | TO-220-3 | OBS | ||||||
SPX3940U-3-3 | TO-220-3 | -40 | 125 | OBS | ||||
SPX3940U-5-0 | TO-220-3 | -40 | 125 | OBS | ||||
SPX3940U-L-1-8 | TO-220-3 | OBS | ||||||
SPX3940U-L-2-5 | TO-220-3 | OBS | ||||||
SPX3940U-L-3-3 | TO-220-3 | OBS | ||||||
SPX3940U-L-5-0 | TO-220-3 | -40 | 125 | OBS |
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Packaging
Pkg Code | Details | Quantities | Dimensions |
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SOT-223-3 |
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TO-220-3 |
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TO-263-3 |
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Notifications
FAQs & Support
Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
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