SPX2945

400mA Low Dropout Voltage Regulator (LDOs)
Data Sheets Active
Order Now

Overview

Information 400mA Low Dropout Voltage Regulator (LDOs)
Output Option Fixed
VOUT (V) 3.3
VOUT Adj MIN (V) -
VOUT Adj MAX (V) -
IOUT (mA) 400
VIN MIN (V) 4.1
VIN MAX (V) 30
IQ (µA) 100
Accuracy (%) 0.5%, 1%
Vdrop (mV) 420
Output Noise (µVRMS) 260
PSRR (dB) 31
Junction Temp Range (°C) -40 to 125
Package SOT223-3
Features Enable,Power Good,Current limit and thermal protection
Show more

The SPX2945 is a low power voltage regulator. This device is an excellent choice for use in battery powered applications such as cordless telephones, radio control systems and portable computers. The SPX2945 features very low quiescent current (100μA typical) and very low dropout voltage. This includes a tight initial tolerance of 1% max and very low output temperature coefficient, making the SPX2945 useful as a low power voltage reference.

The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The SPX2945 is offered in 3-pin TO-220 package, SO-8 (same pinout as SPX2951), SOT-223, surface mount 3-pin TO-252, 3-pin TO-263 packages and 5-pin TO-263.

The regulator output voltage (of the 8-pin SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed from 1.24V to 20V with an external pair of resistors. Look for SPX2951 for 150mA and SPX2954 for 250mA applications.

  • Output 3.3V, 5.0V at 400mA output
  • Very low quiescent current, 100µA
  • Low dropout voltage, 420mV at 400mA
  • Extremely tight load and line regulation
  • Very low temperature coefficient
  • Current and thermal limiting
  • Error flag warns of output dropout
  • Logic controlled electronic shutdown
  • Output programmable from 1.24V to 20V (for SO-8)

Documentation & Design Tools

All Types Data Sheets Application Notes Product Briefs & Brochures Symbols & Footprints
Type Title Version Date File Size
Data Sheets SPX2945 400mA Low Dropout Voltage Regulator with Shutdown R00 May 2023 942.4 KB
Application Notes AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian April 2019 1.2 MB
Product Brochures Power Management Brochure R01 November 2024 2.4 MB
Symbols & Footprints SPX2945M3-L-3-3/TR CAD File (.bxl) September 2018 65.9 KB
Register for a myMxL account or Login to myMxL to view all Technical Documentation & Design Tools.

Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
SPX2945M3-L-3-3/TR N Y Y Y Y L1 / 260ᵒC SOT-223-3

Click on the links above to download the Certificate of Non-Use of Hazardous Substances.

Additional Quality Documentation may be available, please Contact Support.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement Buy Now Order Samples PDN
SPX2945M3-3-3 SOT-223-3 -40 125 OBS SPX2945M3-L-3-3
SPX2945M3-3-3/TR SOT-223-3 -40 125 OBS M3-L-3-3/TR
SPX2945M3-5-0 SOT-223-3 -40 125 OBS SPX2945M3-L-5-0
SPX2945M3-5-0/TR SOT-223-3 -40 125 OBS M3-L-5-0/TR
SPX2945M3-L-3-3 SOT-223-3 -40 125 OBS SPX2945M3-L-3-3/TR
SPX2945M3-L-3-3/TR SOT-223-3 -40 125 Active Order
SPX2945M3-L-5-0 SOT-223-3 -40 125 OBS SPX2945M3-L-5-0/TR
SPX2945M3-L-5-0/TR SOT-223-3 -40 125 OBS
SPX2945R-3-3 TO-252-3 OBS
SPX2945R-3-3/TR TO-252-3 -40 125 OBS
SPX2945R-5-0 TO-252-3 -40 125 OBS
SPX2945R-5-0/TR TO-252-3 OBS
SPX2945R-L-3-3 TO-252-3 -40 125 OBS
SPX2945R-L-3-3/TR TO-252-3 OBS
SPX2945R-L-5-0 TO-252-3 -40 125 OBS
SPX2945R-L-5-0/TR TO-252-3 OBS
SPX2945S-3-3 NSOIC8 -40 125 OBS
SPX2945S-3-3/TR NSOIC8 -40 125 OBS
SPX2945S-5-0 NSOIC8 OBS
SPX2945S-5-0/TR NSOIC8 OBS
SPX2945S-L-3-3 NSOIC8 OBS
SPX2945S-L-3-3/TR NSOIC8 -40 125 OBS
SPX2945S-L-5-0 NSOIC8 -40 125 OBS
SPX2945S-L-5-0/TR NSOIC8 OBS
SPX2945T-3-3 TO-263-3 -40 125 OBS
SPX2945T-3-3/TR TO-263-3 -40 125 OBS
SPX2945T-5-0 TO-263-3 -40 125 OBS
SPX2945T-5-0/TR TO-263-3 -40 125 OBS
SPX2945T-L-3-3 TO-263-3 -40 125 OBS
SPX2945T-L-3-3/TR TO-263-3 -40 125 OBS
SPX2945T-L-5-0 TO-263-3 -40 125 OBS
SPX2945T-L-5-0/TR TO-263-3 -40 125 OBS
SPX2945T5-3-3 TO-263-5 -40 125 OBS
SPX2945T5-3-3/TR TO-263-5 OBS
SPX2945T5-5-0 TO-263-5 OBS
SPX2945T5-5-0/TR TO-263-5 OBS
SPX2945T5-L-3-3 TO-263-5 OBS
SPX2945T5-L-3-3/TR TO-263-5 OBS
SPX2945T5-L-5-0 TO-263-5 -40 125 OBS
SPX2945T5-L-5-0/TR TO-263-5 OBS
SPX2945U-3-3 TO-220-3 -40 125 OBS
SPX2945U-5-0 TO-220-3 -40 125 OBS
SPX2945U-L-3-3 TO-220-3 -40 125 OBS
SPX2945U-L-5-0 TO-220-3 -40 125 OBS
Show obsolete parts
Part Status Legend
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
NSOIC8
  • JEDEC Reference: MS-012
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 128.4ºC/W (std); 96.8ºC/W (fused)
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 98
  • Quantity per Reel: 2500
  • Quantity per Tube: 98
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 4.90
  • Width: 3.90
  • Thickness: 1.75
  • Lead Pitch: 1.27
SOT-223-3
  • JEDEC Reference: TO-261
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 62.3ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 78
  • Quantity per Reel: 2500
  • Quantity per Tube: 78
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Heatsink by sprocket hole
  • Dimensions: mm
  • Length: 6.50
  • Width: 3.50
  • Thickness: 1.80
  • Lead Pitch: 2.30
TO-220-3
  • JEDEC Reference: TO-220
  • MSL Pb-Free: n/a
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 29.4ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: n/a
  • Quantity per Tube: 50
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): n/a
  • Tape & Reel Unit Orientation: n/a
  • Dimensions: inch
  • Length: 0.355 max
  • Width: 0.420 max
  • Thickness: 0.190 max
  • Lead Pitch: 0.10
TO-252-3
  • JEDEC Reference: TO-252
  • MSL Pb-Free: L2 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 50ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 2000
  • Quantity per Tube: 80
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 16 x 8
  • Tape & Reel Unit Orientation: Tab at sprocket hole.
  • Dimensions: inch
  • Length: 0.24
  • Width: 0.265 max
  • Thickness: 0.094 max
  • Lead Pitch: 0.09
TO-263-3
  • JEDEC Reference: TO-263
  • MSL Pb-Free: L3 @ 245ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 31.4ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 500
  • Quantity per Tube: 50
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 24 x 16
  • Tape & Reel Unit Orientation: Tab away from sprocket hole.
  • Dimensions: inch
  • Length: 0.380 max
  • Width: 0.420 max
  • Thickness: 0.190
  • Lead Pitch: 0.10
TO-263-5
  • JEDEC Reference: TO-263
  • MSL Pb-Free: L3 @ 245ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 31.2ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 500
  • Quantity per Tube: 50
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 24 x 16
  • Tape & Reel Unit Orientation: Tab away from sprocket hole.
  • Dimensions: inch
  • Length: 0.380 max
  • Width: 0.420 max
  • Thickness: 0.190
  • Lead Pitch: 0.067

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.
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.
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.
07/11/2017 Product Discontinuation Notification
04/12/2017 Qualification of alternate assembly subcon, JCET.
07/26/2016 Product discontinuation notification. Discontinued.
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.
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.
09/10/2008 Notice of Obsolescence –Selected Power Management Parts This is notification that the Power Management products listed on the attached page have been discontinued by Exar Corporation due to low market demand, effective immediately.
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued.
02/02/2006 Announcing transfer of certain Power Management and Interface Products from Hillview fabrication and facility to wafer foundary Silan. 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

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.

Submit a Technical Support Question As a New Question

Yes. Try our Excel-based heat calculation spreadsheet ANP-03, Thermal Calculator
 
For further study, this spreadsheet is mentioned in the following helpful application note: ANP-02, Thermal Considerations for Linear Regulators 
  

Visit the product page for the part you are interested in.  The part's status is listed in the Parts & Purchasing section.  You can also view Product Lifecycle and Obsolescence Information including PDNs (Product Discontinuation Notifications).
 
To visit a product page, type the part into the search window on the top of the MaxLinear website.
 
In this example, we searched for XRA1201.  Visit the product page by clicking the part number or visit the orderable parts list by clicking "Orderable Parts". 
 
 
 

 

  

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.

 
 
 

 

Company
Information
Contact Us
Careers
Maximize Your Potential

Join the MaxLinear team and help shape the future of networking and communications technology.

© 2024 MaxLinear. All Rights Reserved.