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PSSI2021SAY ECAD models PCB Symbol, Footprint & ECAD Model

Constant current source in SOT353 package

Resistor-equipped PNP transistor with two diodes on one chip in a SOT353 (SC-88A) plastic package. Stabilized output current of between 15 uA and 50 mA by connection of an external resistor between pins 4 and 5.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
PSSI2021SAY PSSI2021SAY,115 934056564115 SOT353 Order product


  • One chip integrated constant current source
  • Output current setting by use of an external resistor
  • Very small package
  • Reduces component count and board space
  • AEC-Q101 qualified

Target applications

  • Automotive applications
  • Generic constant current source
  • Constant current LED driver
  • Active bias control for audio amplifiers


Type numberPackage versionPackage nameSize (mm)Description
PSSI2021SAYSOT353TSSOP52.1 x 1.25 x 0.95Constant Current Source


Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackageOutline versionReflow-/Wave solderingPacking
( 9340 565 64115 )
SOT353Reel 7" Q1/T1

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
Quality and reliability disclaimer

Documentation (8)

File nameTitleTypeDate
PSSI2021SAYConstant current source in SOT353 packageData sheet2009-09-10
Nexperia_document_factsheet_LED_Driver_2019Constant current LED DriversLeaflet2019-09-02
PSSI2021SAY_Nexperia_Product_QualityPSSI2021SAY Nexperia Product QualityQuality document2019-05-20
PSSI2021SAY_Nexperia_Product_ReliabilityPSSI2021SAY Nexperia Product ReliabilityQuality document2019-04-29
PSSI2021SAYPSSI2021SAY SPICE modelSPICE model2019-11-21
SOT353_115Tape reel SMD; standard product orientation 12NC ending 115Packing2012-11-16
SOT353plastic, surface-mounted package; 5 leads; 0.65 mm pitch; 2.1 mm x 1.25 mm x 0.95 mm bodyOutline drawing2019-05-28


If you are in need of design/technical support, let us know and fill in the answer form, we'll get back to you shortly.


File nameTitleTypeDate
PSSI2021SAYPSSI2021SAY SPICE modelSPICE model2019-11-21

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
PSSI2021SAYPSSI2021SAY,115934056564115Reel 7" Q1/T1Order product


As a Nexperia customer you can order samples via our sales organization or directly via our Online Sample Store:

Sample orders normally take 2-4 days for delivery.

If you do not have a direct account with Nexperia our network of global and regional distributors is available and equipped to support you with Nexperia samples.