3A High Current, Low Dropout Voltage Regulator
Data Sheet


The SPX29300/01/02 are 3A, highly accurate voltage regulators with a low dropout voltage of 600mV (typical) at 3A. 

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. On-Chip trimming adjusts the reference voltage to 1% initial accuracy.

The SPX29300 is offered in a 3-pin TO-263 package, the SPX29301 is offered in a 5-pin TO-263 while the SPX29302 is offered in a 5-pin TO-263 and 5-pin TO-220 package.


  • Adjustable output down to 1.25V
  • 1% output accuracy
  • Output current of 3A
  • Low dropout voltage of 450mV @ 3A
  • Extremely tight load and line regulation
  • Extremely fast transient response
  • Reverse battery protection
  • Zero current shutdown (5-pin version)
  • Error flag signal output for out of regulation state (5-pin version)


Design Tools

Symbols & Footprints


Pkg Code Details Quantities Dimensions PDF
  • 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
  • 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

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Buy Now Order Samples
SPX29300T-1-8 TO-263-3 -40 125 OBS
SPX29300T-1-8/TR TO-263-3 -40 125 OBS
SPX29300T-2-5 TO-263-3 -40 125 OBS
SPX29300T-2-5/TR TO-263-3 OBS
SPX29300T-3-3 TO-263-3 -40 125 OBS
SPX29300T-3-3/TR TO-263-3 OBS
SPX29300T-5-0 TO-263-3 -40 125 OBS
SPX29300T-5-0/TR TO-263-3 OBS
SPX29300T-L-1-8 TO-263-3 -40 125 OBS Suggested:
SPX29300T-L-1-8/TR TO-263-3 -40 125 OBS
SPX29300T-L-2-5 TO-263-3 -40 125 OBS Suggested:
SPX29300T-L-2-5/TR TO-263-3 -40 125 Active Order
SPX29300T-L-3-3 TO-263-3 -40 125 OBS Suggested:
SPX29300T-L-3-3/TR TO-263-3 -40 125 Active Order
SPX29300T-L-5-0 TO-263-3 -40 125 OBS Suggested:
SPX29300T-L-5-0/TR TO-263-3 -40 125 Active Order
SPX29300U-1-8 TO-220-3 -40 125 OBS
SPX29300U-2-5 TO-220-3 -40 125 OBS
SPX29300U-3-0 TO-220-3 OBS
SPX29300U-3-3 TO-220-3 -40 125 OBS
SPX29300U-5-0 TO-220-3 -40 125 OBS
SPX29300U-L-1-8 TO-220-3 -40 125 OBS Suggested:
SPX29300U-L-2-5 TO-220-3 -40 125 OBS Suggested:
SPX29300U-L-3-3 TO-220-3 -40 125 OBS Suggested:
SPX29300U-L-5-0 TO-220-3 -40 125 OBS Suggested:
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.

Quality & Environmental Data

Part Number RoHS | Exempt RoHS Halogen Free REACH MSL Rating / Peak Reflow Package
SPX29300T-L-2-5/TR N Y Y Y L3 / 245ᵒC TO-263-3
SPX29300T-L-3-3/TR N Y Y Y L3 / 245ᵒC TO-263-3
SPX29300T-L-5-0/TR N Y Y Y L3 / 245ᵒC TO-263-3

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

Additional Quality Documentation may be available, please Contact Support.
Distribution Date Description File
07/11/2017 Product Discontinuation Notification
08/16/2016 Addition of an alternate qualified location, JCET.
07/26/2016 Product discontinuation notification. Discontinued.
02/05/2016 Alternate assembly site. Addition of an alternate assembly supplier Nantong Fujitsu (China)
05/09/2011 Revised two mask layers. To improve the manufacturing control margin.
04/30/2010 Design and datasheet change. To improve product performance.
03/04/2009 Notice of Obsolescence Discontinued by Exar Corporation due to low market demand
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued.


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.

Frequently Asked Questions

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 

The best way to determine this is to go to maxlinear.com and type the part into the search function. At or near the top of the results you should see something that looks like:

In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result.  This brings you to the product page. For example:


Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:


Notice the status column and the “Show obsolete parts” link.  A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:


Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:


And then Product Change Notifications:


Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:


If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.

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