500mA Alkaline DC/DC Boost Regulator
Data Sheets OBS (Obsolete)


Information 500mA Alkaline DC/DC Boost Regulator
# of Outputs 1
IOUT (A) 0.5
Peak Switch Current (A) 0.28
VIN MIN (V) 0.9
VIN MAX (V) 4.5
Startup Voltage (V) 0.85
IQ (µA) 10
VOUT MIN (V) 3.3
Frequency (kHz)
Efficiency (%) 87
Operating Temperature (°C) -40 to 85
Package SOT23-5
Special Features Non synchronous, Enable pin, Current limiting
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  • Ultra Low Quiescent Current: 10uA
  • Wide Input Voltage Range: 0.9V to 4.5V
  • 90mA IOUT at 1.3V Input 3.3V output (SP6641AEK-3-3)
  • 100mA IOUT at 2.0V Input 5.0V output (SP6641AEK-5-0)
  • 500mA IOUT at 2.6 Input 3.3V output (SP6641BEK-3-3)
  • 500mA IOUT at 3.3V Input 5.0V output (SP6641BEK-5-0)
  • Current Limit Protection
  • Thermal Shutdown Protection with Hysteresis
  • Auxiliary Supply Control
  • Internal 0.3Ω NFET Switch Eliminates External FETs
  • Kelvin Connection with 3.3V Feedback

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 1.0.0 May 2005 131.5 KB
Application Notes ANP-28, Filter Design in Continuous Conduction Mode (CCM) of Operation; Part 2 Boost Regulator A March 2006 285.9 KB
User Guides & Manuals SP6641A-41B Evaluation Board Manual 1.0.0 July 2002 82.8 KB
Symbols & Footprints SP6641BEK-L-3-3/TR CAD File (.bxl) September 2018 81.7 KB
Symbols & Footprints SP6641BEK-L-5-0/TR CAD File (.bxl) September 2018 81.7 KB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
SP6641BEK-L-3-3/TR N Y Y Y Y L1 / 260ᵒC SOT-23-5
SP6641BEK-L-5-0/TR N Y Y Y Y L1 / 260ᵒC SOT-23-5
SP6641BEK-L-3-3/TR N Y Y Y Y L1 / 260ᵒC SOT-23-5
SP6641BEK-L-5-0/TR N Y Y Y Y L1 / 260ᵒC SOT-23-5

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 PDN
SP6641BEK-3-3 SOT-23-5 -40 85 OBS SP6641BEK-L-3-3
SP6641BEK SOT-23-5 -40 85 OBS
SP6641BEK-3-3/TR SOT-23-5 -40 85 OBS
SP6641BEK-5-0 SOT-23-5 -40 85 OBS
SP6641BEK-5-0/TR SOT-23-5 -40 85 OBS
SP6641BEK-L-3-3 SOT-23-5 -40 85 OBS
SP6641BEK-L-3-3/TR SOT-23-5 -40 85 OBS
SP6641BEK-L-5-0 SOT-23-5 -40 85 OBS
SP6641BEK-L-5-0/TR SOT-23-5 -40 85 OBS
SP6641BEK/TR SOT-23-5 -40 85 OBS
SP6641CK/TR SOT-23-5 0 70 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: MO-178
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 191ºC/W
  • Bulk Pack Style: Canister
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 3000
  • Quantity per Tube: n/a
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 180 x 8 x 12
  • Tape & Reel Unit Orientation: 3 Pins at sprocket hole.
  • Dimensions: mm
  • Length: 2.90
  • Width: 1.60
  • Thickness: 1.45
  • Lead Pitch: 0.95


Distribution Date Description File
11/01/2023 To improve manufacturing efficiency, MaxLinear has qualified mold compound GE-1030S-CJ for use on the products listed above. There is no change to form, fit, function and reliability of the parts.
08/19/2022 Product Discontinuation Notice
02/16/2018 Standard tape and reel quantity will change from 2500 pieces to 3000 pieces for SOT23-3L/5L/6L. Addendum: Remove SOT-89 parts from affected products list.
01/30/2017 Qualification of alternate assembly subcon, JCET.
01/12/2017 Standard tape and reel quantity will change from 2500 pieces to 3000 pieces for SOT23-3L/5L/6L.
07/26/2016 Product discontinuation notification. Discontinued.
07/30/2013 Addition of an alternate qualified assembly supplier, Carsem (Malaysia) for SOT23 package using copper wire bonding. Material Change.
08/29/2011 Material change: Mold compound and die attach material are changed and the listed parts will be fully Green (halogen-free). Migrating to green environment and material standardization.
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.

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