50V N-Channel Logic Level Enhancement Mode Field Effect Transistor

This N-Channel enhancement mode field effect transistor is produced using Fairchild's proprietary, high cell density, DMOS technology. This product has been designed to minimize on-state resistance while providing rugged, reliable, and fast switching performance. The BSS138 is particularly suited for low voltage, low current applications such as small servo motor control, power MOSFET gate drivers, and other switching applications.


  • 0.22 A, 50 V. RDS(ON) = 3.5 Ω @ VGS = 10 V. RDS(ON) = 6.0 Ω @ VGS = 4.5 V
  • High density cell design for extremely low RDS(ON).
  • Rugged and Reliable.
  • Compact industry standard SOT-23 surface mount package.
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Index Product Product &
Eco Status
Unit Price/
1K Order
Packing Method Convention Package Marking
0 9G85_BSS138 Full Production (Special Order)

Die/Wafer -  Details

Line 1N/A

RƟJA 350°C/W

0 BSS138 Full Production
Green as of Jan 2013

SOT-23 3L -  Details
1.2 x 2.92 x 1.3mm,  TAPE REEL

PDF SOT-23 3L  Drawing
Last Update: Jan 2015 PDF SOT23-3L Packing Drawing
Last Update: Jan 2015 PDF SOT23-3L, PACKING DRAWING
Last Update: May 2014 PDF SOT23-3L T&R PACKING DRAWING
Last Update: May 2013
Line 1&Y (Binary Calendar Year Coding)

Line 2SS&E (Space)
&G (Weekly Date Code)

FIT 3.5

RƟJA 350°C/W

Moisture Sensitivity Level (MSL) 1

Max Reflow Temp 260


If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
* Click here for further top mark packaging information for BSS138

This product is general usage and suitable for many different applications.
Application Note Description
AN-7515 PDFA Combined Single-Pulse and Repetitive UIS Rating System
Last Update : 03-Mar-2011
AN-9010 PDFMOSFET Basics
Last Update : 09-Sep-2013
AN-4163 PDFShielded Gate PowerTrench® MOSFET Datasheet Explanation
Last Update : 23-Oct-2014
AN-558 PDFIntroduction to Power MOSFETs and their Applications
Last Update : 28-Jun-2014
AN-9034 PDFPower MOSFET Avalanche Guideline
Last Update : 05-Mar-2011
AN-9065 PDFFRFET® in Synchronous Rectification
Last Update : 28-Jun-2014
AN-9005 PDFDriving and Layout Design for Fast Switching Super-Junction MOSFETs
Last Update : 26-Nov-2014
AN-7533 PDFA Revised MOSFET Model With Dynamic Temperature Compensation
Last Update : 05-Mar-2011
AN-7510 PDFA New PSPICE Subcircuit for the Power MOSFET Featuring Global Temperature Options
Last Update : 05-Mar-2011
Package Condition Temperature Range Vcc Range Software Version Revision Date
SOT-23 3L Electrical 25°C to 125°C N/A OrCAD 16.3 06-Nov-2014

For additional information please visit the Models page.

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