High-voltage switching diode

High-voltage switching diode, encapsulated in an ultra small DFN1110D-3 (SOT8015, JEDEC MO340-BA) leadless Surface-Mounted Device (SMD) plastic package with side-wettable flanks.

Features and benefits

  • High switching speed: trr ≤ 50 ns

  • Low leakage current

  • High reverse voltage: VR ≤ 200 V

  • Low capacitance: Cd ≤ 5 pF

  • Leadless ultra small SMD plastic package

  • Low package height of 0.5 mm

  • Suitable for Automatic Optical Inspection (AOI) of solder joint

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


  • High-speed switching

  • General-purpose switching

  • Voltage clamping

  • Reverse polarity protection


Type number Package version Package name Size (mm) VR [max] (V) IFSM [max] (A) VF [max] (mV) IR [max] (nA) IFRM (mA) Configuration trr [max] (ns) IF [max] (mA) Cd [max] (pF)
BAS21QB-Q SOT8015 DFN1110D-3 1.1 x 1 x 0.48 200 9 1250@IF=200mA 100@VR=200V 625 single 50 250 5


Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
Active B6 SOT8015

Environmental information

Type number Orderable part number Chemical content RoHS RHF-indicator
BAS21QB-Q BAS21QB-QZ BAS21QB-Q rohs rhf rhf
Quality and reliability disclaimer

Documentation (12)

File name Title Type Date
BAS21QB-Q High-voltage switching diode Data sheet 2021-05-04
AN90023 Thermal performance of DFN packages Application note 2020-11-23
AN90023_ZH Thermal performance of DFN packages Application note 2021-02-26
AN90032 Low temperature soldering, application study Application note 2022-02-22
Nexperia_asset_document_brochure_autoDFN_CN_LR 小巧轻便的汽车 二极管和晶体管 Brochure 2022-04-26
SOT8015 3D model for products with SOT8015 package Design support 2022-05-03
Nexperia_AutoDFN_factsheet_2022 Small & light automotive diodes and transistors Leaflet 2022-04-13
SOT8015 plastic, leadless extremely thin small outline package with side-wettable flanks (SWF); 3 terminals; 0.65 mm pitch; 1.1 mm x 1 mm x 0.48 mm body Package information 2023-05-31
SOT8015_147 DFN1110D-3; Reel pack for SMD, 7"; Q2/T3 product orientation Packing information 2021-02-08
BAS21QB-Q_Nexperia_Product_Reliability BAS21QB-Q Nexperia Product Reliability Quality document 2024-04-22
REFLOW_BG-BD-1 Reflow soldering profile Reflow soldering 2021-04-06
BAS21QB BAS21QB SPICE model SPICE model 2021-01-08


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 name Title Type Date
BAS21QB BAS21QB SPICE model SPICE model 2021-01-08
SOT8015 3D model for products with SOT8015 package Design support 2022-05-03

Ordering, pricing & availability

Type number Orderable part number Ordering code (12NC) Status Packing Packing Quantity Buy online
BAS21QB-Q BAS21QB-QZ 934662969147 Active SOT8015_147 5,000 Order product


As a Nexperia customer you can order samples via our sales organization.

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. Check out the list of official distributors.

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.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
BAS21QB-Q BAS21QB-QZ 934662969147 SOT8015 Order product