3A Ultra-Low Dropout Voltage Regulator


Information 3A Ultra Low Dropout Voltage Regulator
Package TO263-5
VOUT (V) Adj
VOUT Adj MIN (V) 1.25
VOUT Adj MAX (V) 6
IQ (µA) 5000
VIN MIN (V) 1.8
VIN MAX (V) 5.5
Features Enable,Remote sense,Current limit and thermal protection
Junction Temp Range (°C) 0 to 125
IOUT (mA) 3000
Accuracy (%) 2%
Output Option Adjustable
Vdrop (mV) 400
Output Noise (µVRMS) -
PSRR (dB) 80
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The SPX1582 is a 3A low dropout regulator with extremely low dropout voltage. The adjustable version requires only two external resistors to set the output voltage. The fixed version has a preset output of 3.3V, 2.8V or 2.5V and does not require any external resistors. The SPX1582 features a low dropout of 400mV (Typ.) and offers fast transient response. This device is suitable for Pentium applications requiring 2.8V, 2.5V from 3.3V ATX power supplies, where low current input voltage 1V greater than the output voltage is needed. With an external sense pin the load regulation is less than 1mV. This device is an excellent choice for use in powering low voltage microprocessors that require a lower dropout, fast transient response to regulate from 3.3V and 5V supplies. The SPX1582 is also an excellent choice as a post regulator for switching supply applications.

The SPX1582 offers protection against overcurrent faults, reversed input polarity, over temperature operation and positive or negative transient voltages.

The SPX1582 is offered in a 5-pin TO-220 and TO-263 compatible with industry standard 5-terminal regulators. For 5A, 3A and 1.5A ultra-low dropout versions refer to SPX1581, SPX1582 and SPX1583 datasheets respectively.

  • Low dropout voltage 500mV at 3A full load current
  • Adjustable ouput down to 1.25V from ATX power supply
  • Extremely tight load and line regulation
  • Standard 5-terminal low cost TO263

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets SPX1582 3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed 1.0.0 January 2007 205.1 KB
Application Notes AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian April 2019 1.2 MB
Product Brochures Power Management Brochure October 2020 2.4 MB
Symbols & Footprints SPX1582T5-L/TR CAD File (.bxl) September 2018 18.5 KB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
SPX1582T5-L/TR N Y Y Y Y L3 / 245ᵒC TO-263-5

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
SPX1582HT5-L TO-263-5 0 125 OBS
SPX1582HT5-L/TR TO-263-5 0 125 OBS
SPX1582T5 TO-263-5 0 125 OBS
SPX1582T5/TR TO-263-5 0 125 OBS
SPX1582T5-1-5 TO-263-5 OBS
SPX1582T5-1-8 TO-263-5 OBS
SPX1582T5-2-5 TO-263-5 OBS
SPX1582T5-2-5/TR TO-263-5 OBS
SPX1582T5-2-8 TO-263-5 OBS
SPX1582T5-2-8/TR TO-263-5 OBS
SPX1582T5-2-85 TO-263-5 OBS
SPX1582T5-2-85/TR TO-263-5 OBS
SPX1582T5-3-3 TO-263-5 0 125 OBS
SPX1582T5-3-3/TR TO-263-5 OBS
SPX1582T5-5-0 TO-263-5 OBS
SPX1582T5-5-0/TR TO-263-5 OBS
SPX1582T5-L TO-263-5 0 125 OBS SPX1582T5-L/TR
SPX1582T5-L/TR TO-263-5 0 125 Active Order
SPX1582T5-L-1-5 TO-263-5 0 125 OBS SPX1582T5-L
SPX1582T5-L-1-5/TR TO-263-5 0 125 OBS SPX1582T5-L/TR
SPX1582T5-L-1-8 TO-263-5 0 125 OBS SPX1582T5-L
SPX1582T5-L-1-8/TR TO-263-5 0 125 OBS SPX1582T5-L/TR
SPX1582T5-L-2-5 TO-263-5 0 125 OBS SPX1582T5-L-2-5/TR
SPX1582T5-L-2-5/TR TO-263-5 0 125 OBS SPX1582T5-L/TR
SPX1582T5-L-2-8 TO-263-5 0 125 OBS SPX1582T5-L
SPX1582T5-L-2-8/TR TO-263-5 0 125 OBS SPX1582T5-L/TR
SPX1582T5-L-2-85 TO-263-5 0 125 OBS SPX1582T5-L
SPX1582T5-L-2-85/TR TO-263-5 0 125 OBS SPX1582T5-L/TR
SPX1582T5-L-3-0 TO-263-5 0 125 OBS
SPX1582T5-L-3-0/TR TO-263-5 0 125 OBS
SPX1582T5-L-3-3 TO-263-5 0 125 OBS SPX1582T5-L
SPX1582T5-L-3-3/TR TO-263-5 0 125 OBS SPX1582T5-L/TR
SPX1582T5-L-5-0 TO-263-5 0 125 OBS SPX1582T5-L
SPX1582T5-L-5-0/TR TO-263-5 0 125 OBS SPX1582T5-L/TR
SPX1582U5 TO-220-5 0 125 OBS
SPX1582U5-1-5 TO-220-5 OBS
SPX1582U5-1-8 TO-220-5 OBS
SPX1582U5-2-5 TO-220-5 OBS
SPX1582U5-2-8 TO-220-5 OBS
SPX1582U5-2-8/TR TO-220-5 0 125 OBS
SPX1582U5-2-85 TO-220-5 OBS
SPX1582U5-2-85/TR TO-220-5 0 125 OBS
SPX1582U5-3-3 TO-220-5 OBS
SPX1582U5-5-0 TO-220-5 OBS
SPX1582U5-5-0/TR TO-220-5 0 125 OBS
SPX1582U5-L TO-220-5 OBS
SPX1582U5-L-1-5 TO-220-5 OBS
SPX1582U5-L-1-8 TO-220-5 OBS
SPX1582U5-L-2-5 TO-220-5 0 125 OBS
SPX1582U5-L-2-8 TO-220-5 OBS
SPX1582U5-L-2-85 TO-220-5 OBS
SPX1582U5-L-3-0 TO-220-5 0 125 OBS
SPX1582U5-L-3-3 TO-220-5 OBS
SPX1582U5-L-5-0 TO-220-5 OBS
SPX1582UT-L-5-0 TO-220-5 0 125 OBS
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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.


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: TS-001
  • MSL Pb-Free: n/a
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 29.3ºC/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: 0.370 max
  • Width: 0.415 max
  • Thickness: 0.190 max
  • Lead Pitch: 0.067
  • 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


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.
12/22/2015 Alternate assembly site Addition of an alternate assembly supplier Nantong Fujitsu (China).
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.
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

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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 

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.