250mA Low Dropout Voltage Regulator
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Information 250mA Low Dropout Voltage Regulator
Output Option Fixed
VOUT (V) 3.3, 5.0
VOUT Adj MIN (V) -
VOUT Adj MAX (V) -
IOUT (mA) 250
VIN MIN (V) 2.4
VIN MAX (V) 30
IQ (µA) 150
Accuracy (%) 0.5%, 1%
Vdrop (mV) 310
Output Noise (µVRMS) 160
PSRR (dB) -
Junction Temp Range (°C) -40 to 125
Package SOT223-3
Features Enable,Power Good,Current limit and thermal protection
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The SPX2954 and SPX2954A are low power voltage regulators. These devices are an excellent choice for use in battery powered applications such as cordless telephones, radio control systems and portable computers. The SPX2954 and SPX2954A feature low quiescent current and low dropout voltage (typical 20mV at 100μA and 310mV at 250mA). This includes a tight initial tolerance (0.5% for SPX2954A), extremely good load and line regulation (0.05% typical) and very low output temperature coefficient (20 ppm/°C typical), making the SPX2954/SPX2954A useful as a low power voltage reference.

The error flag output feature is used as a power-on reset for warning of a low output voltage, due to a falling input voltage. The logic-compatible shutdown feature enables the regulator to be switched on and off. The SPX2954/SPX2954A is offered in 3-pin TO-92, TO-263, SOT-223 and TO-220 packages and an 8-pin SOIC package.

  • 5.0V and 3.3V versions at 250mA output
  • Accurate 0.5% for SPX2954A
  • Very low quiescent current
  • Low dropout: 310mV at 250mA
  • Extremely tight load and line regulation
  • Very low temperature coefficient
  • Current and thermal limiting
  • Need only 1μF for stability
  • Direct replacement for LP2954
  • 8-pin versions only
  • Error flag warns of output dropout
  • Logic controlled electronic shutdown
  • Programmable output from 1.24V to 30V

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets SPX2954 250mA Low Dropout Voltage Regulator 1B September 2022 560.4 KB
Application Notes AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian April 2019 1.2 MB
Product Brochures Power Management Brochure October 2020 2.4 MB
Symbols & Footprints SPX2954AM3-L-5-0/TR CAD File (.bxl) September 2018 24.9 KB
Symbols & Footprints SPX2954M3-L-3-3/TR CAD File (.bxl) September 2018 24.9 KB
Symbols & Footprints SPX2954M3-L-5-0/TR CAD File (.bxl) September 2018 24.9 KB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
SPX2954AM3-L-5-0/TR N Y Y Y Y L1 / 260ᵒC SOT-223-3
SPX2954M3-L-3-3/TR N Y Y Y Y L1 / 260ᵒC SOT-223-3
SPX2954M3-L-5-0/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
SPX2954AM3-3-3 SOT-223-3 -40 125 OBS
SPX2954AM3-3-3/TR SOT-223-3 OBS
SPX2954AM3-5-0 SOT-223-3 OBS
SPX2954AM3-5-0/TR SOT-223-3 -40 125 OBS
SPX2954AM3-L-3-3 SOT-223-3 -40 125 OBS SPX2954M3-L-3-3
SPX2954AM3-L-3-3/TR SOT-223-3 -40 125 OBS SPX2954M3-L-3-3/TR
SPX2954AM3-L-5-0 SOT-223-3 -40 125 OBS SPX2954AM3-L-5-0/TR
SPX2954AM3-L-5-0/TR SOT-223-3 -40 125 Active Order
SPX2954AN-3-3 TO-92-3 OBS
SPX2954AN-3-3/TR TO-92-3 OBS
SPX2954AN-5-0 TO-92-3 OBS
SPX2954AN-5-0/TR TO-92-3 OBS
SPX2954AN-L-3-3 TO-92-3 -40 125 OBS
SPX2954AN-L-3-3/TR TO-92-3 OBS
SPX2954AN-L-5-0 TO-92-3 -40 125 OBS
SPX2954AN-L-5-0/TR TO-92-3 OBS
SPX2954AS-5-0 NSOIC8 -40 125 OBS
SPX2954AS-L-3-3 NSOIC8 -40 125 OBS SPX2954S-L-3-3
SPX2954AS-L-3-3/TR NSOIC8 -40 125 OBS SPX2954S-L-3-3/TR
SPX2954AS-L-5-0 NSOIC8 -40 125 OBS SPX2954AS-L-5-0/TR
SPX2954AS-L-5-0/TR NSOIC8 -40 125 OBS SPX2954AM3-L-5-0/TR
SPX2954AT-3-3 TO-263-3 OBS
SPX2954AT-3-3/TR TO-263-3 OBS
SPX2954AT-5-0 TO-263-3 OBS
SPX2954AT-5-0/TR TO-263-3 OBS
SPX2954AT-L-3-3 TO-263-3 OBS
SPX2954AT-L-3-3/TR TO-263-3 OBS
SPX2954AT-L-5-0 TO-263-3 -40 125 OBS
SPX2954AT-L-5-0/TR TO-263-3 OBS
SPX2954AU-3-3 TO-220-3 OBS
SPX2954AU-5-0 TO-220-3 -40 125 OBS
SPX2954AU-L-3-3 TO-220-3 OBS
SPX2954AU-L-5-0 TO-220-3 OBS
SPX2954M3-3-3 SOT-223-3 OBS
SPX2954M3-3-3/TR SOT-223-3 OBS
SPX2954M3-5-0 SOT-223-3 -40 125 OBS
SPX2954M3-5-0/TR SOT-223-3 -40 125 OBS
SPX2954M3-L-3-3 SOT-223-3 -40 125 OBS SPX2954M3-L-3-3/TR
SPX2954M3-L-3-3/TR SOT-223-3 -40 125 Active Order
SPX2954M3-L-5-0 SOT-223-3 -40 125 OBS SPX2954M3-L-5-0/TR
SPX2954M3-L-5-0/TR SOT-223-3 -40 125 Active Order
SPX2954N-3-3 TO-92-3 -40 125 OBS
SPX2954N-3-3/TR TO-92-3 OBS
SPX2954N-5-0 TO-92-3 -40 125 OBS
SPX2954N-5-0/TR TO-92-3 OBS
SPX2954N-L-3-3 TO-92-3 -40 125 OBS
SPX2954N-L-3-3/TR TO-92-3 OBS
SPX2954N-L-5-0 TO-92-3 OBS
SPX2954N-L-5-0/TR TO-92-3 OBS
SPX2954S-3-3 NSOIC8 -40 125 OBS
SPX2954S-5-0/TR NSOIC8 -40 125 OBS
SPX2954S-L-3-3 NSOIC8 -40 125 OBS SPX2954S-L-3-3/TR
SPX2954S-L-3-3/TR NSOIC8 -40 125 OBS SPX2954M3-L-3-3/TR
SPX2954S-L-5-0 NSOIC8 -40 125 OBS SPX2954S-L-5-0/TR
SPX2954S-L-5-0/TR NSOIC8 -40 125 OBS
SPX2954T-3-3 TO-263-3 OBS
SPX2954T-3-3/TR TO-263-3 OBS
SPX2954T-5-0 TO-263-3 -40 125 OBS
SPX2954T-5-0/TR TO-263-3 -40 125 OBS
SPX2954T-L-3-3 TO-263-3 OBS
SPX2954T-L-3-3/TR TO-263-3 OBS
SPX2954T-L-5-0 TO-263-3 -40 125 OBS
SPX2954T-L-5-0/TR TO-263-3 -40 125 OBS
SPX2954U-3-3 TO-220-3 OBS
SPX2954U-5-0 TO-220-3 -40 125 OBS
SPX2954U-L-3-3 TO-220-3 OBS
SPX2954U-L-5-0 TO-220-3 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.


Pkg Code Details Quantities Dimensions PDF
  • 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
  • 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
  • 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
  • JEDEC Reference: n/a
  • MSL Pb-Free: n/a
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 131.9ºC/W
  • Bulk Pack Style: Ammo
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 2000
  • Quantity per Tube: n/a
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): Ammo
  • Tape & Reel Unit Orientation: Ammopack
  • Dimensions: inch
  • Length: 0.195 max
  • Width: 0.195 max
  • Thickness: 0.155 max
  • Lead Pitch: 0.055


Distribution Date Description File
07/11/2017 Product Discontinuation Notification
04/12/2017 Qualification of alternate assembly subcon, JCET.
02/15/2017 Qualification of alternate assembly subcon, ANST.
07/26/2016 Product discontinuation notification. Discontinued.
04/13/2016 Qualification of alternate assembly subcon, JCET.
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.
07/02/2013 Qualification of an alternate qualified assembly supplier, ASE Chung-Li (Taiwan) for the 8L NSOIC package using copper wire bonding. Material change and alternate assembly supplier qualified.
03/23/2010 Alternate qualified assembly supplier Capacity enhancement
12/07/2009 Enhancement of NSOIC 8, NSOIC14 and NSOIC16 packages to Green (halogen-free) via Mold Compound & Die Attach Material. Enhance packages to be Green (halogen-free).
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

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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 

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