High-voltage switching diode

High-voltage switching diode, encapsulated in an ultra small SOD523 (SC-79) flat lead Surface-Mounted Device (SMD) plastic package.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
BAS521-Q BAS521-QX 934662966115 SOD523 Order product
BAS521-Q BAS521-QYL 934662966315 SOD523 Order product
BAS521-Q BAS521-QF 934662966135 SOD523 Order product

Features and benefits

  • High switching speed: trr ≤ 50 ns

  • High reverse voltage: VR ≤ 300 V

  • Repetitive peak forward current: IFRM ≤ 1 A

  • Ultra small SMD plastic package

  • Qualified according to AEC-Q101 and recommended for use in automotive applications


  • High-speed switching

  • High-voltage switching


Type numberPackage versionPackage nameSize (mm)Automotive qualified
BAS521-QSOD523SC-791.2 x 0.8 x 0.6Y

PCB Symbol, Footprint and 3D Model

Model NameDescription


Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackagePackage informationReflow-/Wave solderingPacking
( 9346 629 66115 )
( 9346 629 66315 )
( 9346 629 66135 )

Environmental information

Type numberOrderable part numberChemical contentRoHSRHF-indicator
Quality and reliability disclaimer

Documentation (7)

File nameTitleTypeDate
BAS521-QHigh-voltage switching diodeData sheet2022-06-15
BAS521-Q_Nexperia_Product_ReliabilityBAS521-Q Nexperia Product ReliabilityQuality document2023-04-04
BAS521BAS521 SPICE modelSPICE model2023-08-10
SOD523_135Reel pack for SMD, 11''; Q1/T1-Q2/T3 product orientationPacking information2021-02-05
SOD523_315Reel pack, SMD, 7"; Q1/T1 standard product orientation; Orderable part number ending ,315 or YL; Ordering code (12NC) ending 315Packing information2020-04-21
SOD523_115Reel pack for SMD, 7''; Q1/T1-Q2/T3 product orientationPacking information2021-02-05
REFLOW_BG-BD-1Reflow soldering profileReflow soldering2021-04-06


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
BAS521BAS521 SPICE modelSPICE model2023-08-10

PCB Symbol, Footprint and 3D Model

Model NameDescription

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingPacking quantityBuy online
BAS521-QBAS521-QX934662966115SOD523_115- Order product
BAS521-QBAS521-QYL934662966315SOD523_315- Order product
BAS521-QBAS521-QF934662966135SOD523_135- Order product


As a Nexperia customer you can order samples via our sales organization or directly via our Online Sample Store: https://extranet.nexperia.com.

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.

How does it work?

The interactive datasheets are based on the Nexperia MOSFET precision electrothermal models. With our interactive datasheets you can simply specify your own conditions interactively. Start by changing the values of the conditions. You can do this by using the sliders in the condition fields. By dragging the sliders you will see how the MOSFET will perform at the new conditions set.