Overview
Information | 1.0A Low Dropout Voltage Regulator |
---|---|
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 | Click Buy Now | 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 | Click Buy Now | 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 | Click Buy Now | 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 | Click Buy Now | 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 | Click Buy Now | 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 | Click Buy Now | 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
Distribution Date | Description | File |
---|---|---|
07/17/2023 | In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. ADDENDUM A: Fixed MBB label logo for DX204001 to MaxLinear logo. ADDENDUM B: Replaced ‘All other affected products outer box label’ with clearer pictures. Corrected Date Issued (from original PCN) issue date +90 days to August 30, 2023. | PCN & PDN Download |
06/01/2023 | In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. | PCN & PDN Download |
06/01/2023 | In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. ADDENDUM: Fixed MBB label logo for DX204001 to MaxLinear logo. | PCN & PDN Download |
05/08/2019 | Product Discontinuation Notice | PCN & PDN Download |
02/27/2018 | Qualification of alternate assembly subcon, JCET. | PCN & PDN Download |
07/11/2017 | Product Discontinuation Notification | PCN & PDN Download |
04/12/2017 | Qualification of alternate assembly subcon, JCET. | PCN & PDN Download |
08/16/2016 | Addition of an alternate qualified location, JCET. | PCN & PDN Download |
07/26/2016 | Product discontinuation notification. Discontinued. | PCN & PDN Download |
02/25/2016 | Alternate assembly site. Addition of an alternate assembly supplier JCET. | PCN & PDN Download |
02/05/2016 | Alternate assembly site. Addition of an alternate assembly supplier Nantong Fujitsu (China) | PCN & PDN Download |
10/05/2015 | JCET as alternate assembly site Addition of qualified alternate assembly site and material change using copper wire or gold wire. | PCN & PDN Download |
09/09/2013 | Addition of an alternate qualified SOT-223 assembly site, Carsem (Malaysia) using Hitachi CEL9240 molding compound, in addition to the current qualified assembly site, Unisem (Ipoh) using Sumitomo G600 molding compound. Material Change & Alternate Assembly Site. | PCN & PDN Download |
02/06/2012 | Packing Change: The carrier tape size changed from 16x12 mm to 12x8 mm. Quantity per reel remains the same (2.5Ku per reel). Standardization and business consolidation. | PCN & PDN Download |
03/04/2009 | Notice of Obsolescence Discontinued by Exar Corporation due to low market demand | PCN & PDN Download |
02/28/2007 | Product Obsolescence Letter and Discontinuation Notification. Discontinued. | PCN & PDN Download |
02/02/2006 | Announcing transfer of certain Power Management and Interface Products from Hillview fabrication facility to wafer foundary BCD. See attached Product List Power Management and Interface products as listed are being transfer to external wafer foundry, due to cessation of operations of the sipex Hillview Fabrication manufacturing site | PCN & PDN Download |
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.
For ordering information and general customer service visit our Contact Us page.
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The Parts & Purchasing section of the product page shows the Status of all orderable part numbers for that product. Click Show obsolete parts, to see all EOL or OBS products.