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


Information 500mA Alkaline DC/DC Boost Regulator
Package SOT23-5
IQ (µA) 10
# of Channels 1
Special Features Non synchronous, Enable pin, Current limiting
VIN MIN (V) 0.9
VIN MAX (V) 4.5
# of Outputs 1
VOUT MIN (V) 3.3
Frequency (kHz)
Efficiency (%) 87
Features Non synchronous, Enable pin, Current limiting
IOUT (mA) 100
IOUT (A) 0.1
Operating Temperature (°C) -40 to 85
Peak Switch Current (A) 0.28
Startup Voltage (V) 0.85
Switching Frequency (kHz)
Operating Temp Range (°C) 0 to 85 -40 to 85
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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
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 SP6641AEK-L-3-3/TR CAD File (.bxl) September 2018 81.7 KB
Symbols & Footprints SP6641AEK-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
SP6641AEK-L-3-3/TR N Y Y Y Y L1 / 260ᵒC SOT-23-5
SP6641AEK-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
SP6641AEK SOT-23-5 -40 85 OBS
SP6641AEK/TR SOT-23-5 -40 85 OBS
SP6641AEK-3-3 SOT-23-5 -40 85 OBS
SP6641AEK-3-3/TR SOT-23-5 -40 85 OBS AEK-L-3-3/TR
SP6641AEK-5-0 SOT-23-5 -40 85 OBS
SP6641AEK-5-0/TR SOT-23-5 -40 85 OBS AEK-L-5-0/TR
SP6641AEK-L-3-3 SOT-23-5 -40 85 OBS SP6641AEK-3-3/TR
SP6641AEK-L-3-3/TR SOT-23-5 -40 85 OBS
SP6641AEK-L-5-0 SOT-23-5 -40 85 OBS
SP6641AEK-L-5-0/TR SOT-23-5 -40 85 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: 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
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.
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.

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