1.5A Low Dropout Voltage Regulator
Data Sheet


The SPX29150/51/52/53 are 1.5A, highly accurate voltage regulators with a low dropout voltage of 390mV (typical) at 1.5A. 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. Other features in the 5-pin versions include enable and error flags.

The SPX29150/51/52/53 is offered in 3-pin and 5-pin TO-220 and TO-263 packages. For a 3A version, refer to the SPX29300 datasheet.


  • 1% output accuracy
  • Output current of 1.5A
  • Low dropout voltage of 390mV @ 1.5A
  • 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
SPX29150JT-L-3-3/TR TO-263-3 -40 125 OBS
SPX29150JT-L-5-0 TO-263-3 -40 125 OBS
SPX29150JT-L-5-0/TR TO-263-3 -40 125 OBS
SPX29150JU-L-3-3 TO-220-3 -40 125 OBS
SPX29150T-1-8 TO-263-3 -40 125 OBS
SPX29150T-1-8/TR TO-263-3 -40 125 OBS
SPX29150T-2-5 TO-263-3 -40 125 OBS
SPX29150T-2-5/TR TO-263-3 -40 125 OBS
SPX29150T-3-3 TO-263-3 -40 125 OBS
SPX29150T-3-3/TR TO-263-3 -40 125 OBS
SPX29150T-5-0 TO-263-3 -40 125 OBS
SPX29150T-5-0/TR TO-263-3 -40 125 OBS
SPX29150T-L-1-8 TO-263-3 -40 125 OBS Suggested:
SPX29150T-L-1-8/TR TO-263-3 -40 125 OBS
SPX29150T-L-2-5 TO-263-3 -40 125 OBS Suggested:
SPX29150T-L-2-5/TR TO-263-3 -40 125 OBS Suggested:
SPX29150T-L-3-3 TO-263-3 -40 125 OBS
SPX29150T-L-3-3/TR TO-263-3 -40 125 Active Order
SPX29150T-L-5-0 TO-263-3 -40 125 OBS
SPX29150T-L-5-0/TR TO-263-3 -40 125 OBS Suggested:
SPX29300T-L-3-3/TR or SPX29300T-L-5-0/TR
SPX29150U-1-8 TO-220-3 OBS
SPX29150U-2-5 TO-220-3 OBS
SPX29150U-3-3 TO-220-3 -40 125 OBS
SPX29150U-5-0 TO-220-3 -40 125 OBS
SPX29150U-L-1-8 TO-220-3 -40 125 OBS Suggested:
SPX29150U-L-2-5 TO-220-3 -40 125 OBS Suggested:
SPX29150U-L-2-5/TR TO-220-3 -40 125 OBS Suggested:
SPX29150U-L-3-3 TO-220-3 -40 125 OBS
SPX29150U-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.

Quality & Environmental Data

Part Number RoHS | Exempt RoHS Halogen Free REACH MSL Rating / Peak Reflow Package
SPX29150T-L-3-3/TR Y | 7a N 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
02/27/2018 Qualification of alternate assembly subcon, JCET.
02/14/2018 Product Discontinuation Notice
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)
05/22/2013 Addition of JCET as an alternate qualified assembly and test location. Process & material change.
08/07/2009 Notice of Obsolescence – Selected Power Management Parts Discontinued due to low market demand, effective immediately.
06/04/2009 Die attach material is changed from Pb/Sn/Ag solder to 84-1LMISR4 epoxy. To eliminate lead – To be RoHS compliance without exemption.
03/04/2009 Notice of Obsolescence Discontinued by Exar Corporation due to low market demand
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 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


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

The output capacitor should be a minimum of 10uF for stable operation. Input capacitor should be 6.8uF minimum. There are no actual limitations for output capacitor value. Increasing output capacitance will help to improve transient response. If transient response is not much of a concern, then the 10uF output capacitor would be fine. If your application requires a better transient response then the output capacitance value could range from 47uF up to 470uF. It is basically up to the end user to determine largest output capacitance value for application based on bench test results and expectations.

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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