SPX3940

1.0A Low Dropout Voltage Regulator

Description

The SPX3940 is a 1A, accurate voltage regulator with a low drop out voltage of 280mV (typical) at 1A.

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.

The SPX3940 is offered in 3-pin SOT-223 and TO-263 packages. For a 3A version, refer to the SPX29300 datasheet.

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Features

  • 1% output accuracy SPX3940A
  • Guaranteed 1.5A peak current
  • Low quiescent current
  • Low dropout voltage of 280mV at 1A
  • Extremely tight load and line regulation
  • Extremely fast transient response
  • Reverse battery protection
  • Internal short-circuit current limit
  • Replacement for LM3940

Documentation

Datasheet

SPX3940 1A Low Dropout Voltage Regulator

Product FAQs

SPX3940 FAQ

Quality Reliability

Reliability Report

Product Brochure

Power Management Brochure

Application

Design Tools

Packaging

Pkg Code Details Quantities Dimensions PDF
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: n/a
  • Quantity per Reel: 2500
  • Quantity per Tube: 78
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 16 x 12
  • Tape & Reel Unit Orientation: Tab at sprocket hole.
  • Dimensions: mm
  • Length: 6.50
  • Width: 3.50
  • Thickness: 1.60
  • 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-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 max
  • Lead Pitch: 0.10

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
SPX3940AM3-1-8 SOT-223-3 OBS
SPX3940AM3-1-8/TR SOT-223-3 OBS
SPX3940AM3-2-5 SOT-223-3 OBS
SPX3940AM3-2-5/TR SOT-223-3 -40 125 OBS
SPX3940AM3-3-3 SOT-223-3 -40 125 OBS
SPX3940AM3-3-3/TR SOT-223-3 -40 125 OBS
SPX3940AM3-5-0 SOT-223-3 -40 125 OBS
SPX3940AM3-5-0/TR SOT-223-3 -40 125 OBS
SPX3940AM3-L-1-8 SOT-223-3 -40 125 OBS Suggested:
SPX3940AM3-L-1-8/TR
SPX3940AM3-L-1-8/TR SOT-223-3 -40 125 Active
SPX3940AM3-L-2-5 SOT-223-3 -40 125 OBS Suggested:
SPX3940AM3-L-2-5/TR
SPX3940AM3-L-2-5/TR SOT-223-3 -40 125 Active
SPX3940AM3-L-3-3 SOT-223-3 -40 125 Active
SPX3940AM3-L-3-3/TR SOT-223-3 -40 125 Active
SPX3940AM3-L-5-0 SOT-223-3 -40 125 OBS Suggested:
SPX3940AM3-L-5-0/TR
SPX3940AM3-L-5-0/TR SOT-223-3 -40 125 Active
SPX3940AT-1-8 TO-263-3 -40 125 OBS
SPX3940AT-1-8/TR TO-263-3 -40 125 OBS
SPX3940AT-2-5 TO-263-3 OBS
SPX3940AT-2-5/TR TO-263-3 OBS
SPX3940AT-3-3 TO-263-3 -40 125 OBS
SPX3940AT-3-3/TR TO-263-3 -40 125 OBS
SPX3940AT-5-0 TO-263-3 OBS
SPX3940AT-5-0/TR TO-263-3 OBS
SPX3940AT-L-1-8 TO-263-3 -40 125 OBS Suggested:
SPX3940AT-L-1-8/TR
SPX3940AT-L-1-8/TR TO-263-3 -40 125 Active
SPX3940AT-L-2-5 TO-263-3 -40 125 OBS Suggested:
SPX3940AM3-L-2-5
SPX3940AT-L-2-5/TR TO-263-3 -40 125 OBS Suggested:
SPX3940AM3-L-2-5/TR
SPX3940AT-L-3-3 TO-263-3 -40 125 OBS Suggested:
SPX3940AT-L-3-3/TR
SPX3940AT-L-3-3/TR TO-263-3 -40 125 Active
SPX3940AT-L-5-0 TO-263-3 -40 125 OBS Suggested:
SPX3940AT-L-5-0/TR
SPX3940AT-L-5-0/TR TO-263-3 -40 125 Active
SPX3940AU-1-8 TO-220-3 OBS
SPX3940AU-2-5 TO-220-3 OBS
SPX3940AU-3-3 TO-220-3 OBS
SPX3940AU-5-0 TO-220-3 OBS
SPX3940AU-L-1-8 TO-220-3 OBS
SPX3940AU-L-2-5 TO-220-3 OBS
SPX3940AU-L-3-3 TO-220-3 OBS
SPX3940AU-L-5-0 TO-220-3 -40 125 OBS
SPX3940M3-1-8 SOT-223-3 OBS
SPX3940M3-1-8/TR SOT-223-3 OBS
SPX3940M3-2-5 SOT-223-3 -40 125 OBS
SPX3940M3-2-5/TR SOT-223-3 OBS
SPX3940M3-3-3 SOT-223-3 -40 125 OBS
SPX3940M3-3-3/TR SOT-223-3 -40 125 OBS
SPX3940M3-5-0 SOT-223-3 -40 125 OBS
SPX3940M3-5-0/TR SOT-223-3 -40 125 OBS
SPX3940M3-L-1-8 SOT-223-3 -40 125 OBS Suggested:
SPX3940AM3-L-1-8
SPX3940M3-L-1-8/TR SOT-223-3 -40 125 OBS Suggested:
SPX3940AM3-L-1-8/TR
SPX3940M3-L-2-5 SOT-223-3 -40 125 OBS Suggested:
SPX3940M3-L-2-5/TR
SPX3940M3-L-2-5/TR SOT-223-3 -40 125 Active
SPX3940M3-L-3-3 SOT-223-3 -40 125 Active
SPX3940M3-L-3-3/TR SOT-223-3 -40 125 OBS Suggested:
SPX3940M3-L-3-3/TR
SPX3940M3-L-5-0 SOT-223-3 -40 125 Active
SPX3940M3-L-5-0/TR SOT-223-3 -40 125 Active
SPX3940T-1-8 TO-263-3 OBS
SPX3940T-1-8/TR TO-263-3 OBS
SPX3940T-2-5 TO-263-3 OBS
SPX3940T-2-5/TR TO-263-3 OBS
SPX3940T-3-3 TO-263-3 -40 125 OBS
SPX3940T-3-3/TR TO-263-3 -40 125 OBS
SPX3940T-5-0 TO-263-3 OBS
SPX3940T-5-0/TR TO-263-3 OBS
SPX3940T-L-1-8 TO-263-3 -40 125 OBS Suggested:
SPX3940AM3-L-1-8
SPX3940T-L-1-8/TR TO-263-3 -40 125 OBS Suggested:
SPX3940AM3-L-1-8/TR
SPX3940T-L-2-5 TO-263-3 -40 125 OBS Suggested:
SPX3940AM3-L-2-5
SPX3940T-L-2-5/TR TO-263-3 -40 125 OBS Suggested:
SPX3940AM3-L-2-5/TR
SPX3940T-L-3-3 TO-263-3 -40 125 OBS Suggested:
SPX3940T-L-3-3/TR
SPX3940T-L-3-3/TR TO-263-3 -40 125 Active
SPX3940T-L-5-0 TO-263-3 -40 125 OBS
SPX3940T-L-5-0/TR TO-263-3 -40 125 OBS
SPX3940U-1-8 TO-220-3 OBS
SPX3940U-2-5 TO-220-3 OBS
SPX3940U-3-3 TO-220-3 -40 125 OBS
SPX3940U-5-0 TO-220-3 -40 125 OBS
SPX3940U-L-1-8 TO-220-3 OBS
SPX3940U-L-2-5 TO-220-3 OBS
SPX3940U-L-3-3 TO-220-3 OBS
SPX3940U-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.
Distribution Date Description File
04/12/2017 Qualification of alternate assembly subcon, JCET. PCN 17-0207-01 JCET-1033.pdf
08/16/2016 Addition of an alternate qualified location, JCET. PCN 16-0522-02 JCET-1033.pdf
07/26/2016 Product discontinuation notification. Discontinued. PDN 16-0626-01-1033.pdf
02/25/2016 Alternate assembly site. Addition of an alternate assembly supplier JCET. PCN 16-0103-03 JCET-1033.PDF
02/05/2016 Alternate assembly site. Addition of an alternate assembly supplier Nantong Fujitsu (China) PCN 15-1250-03 Nantong Fujitsu-1033.pdf
10/05/2015 JCET as alternate assembly site Addition of qualified alternate assembly site and material change using copper wire or gold wire. PCN 15-0103-01-1033.pdf
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. PCN_13-0623-02-1033.pdf
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. PCN_12-0106-1-1033.pdf
03/04/2009 Notice of Obsolescence Discontinued by Exar Corporation due to low market demand PDN_090304-01-1033.pdf
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued. POL_022807-1033.pdf
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 PCN-06-0130-55-1033.pdf