BSS138 MOSFET Datasheet, Pinout, Features & Applications

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Electrical Engineering

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Hi Everyone! Hope you’re well today. I welcome you on board. In this post today, I’ll detail the Introduction to BSS138.

The BSS138 is an N-Channel Logic Level Enhancement Mode Field Effect Transistor that is available in surface mount package SOT-23. It features a low input capacitance of around 40pF and a low on-state resistance of around 3.5. High switching speed and low threshold voltage make this device an ideal pick for level shifter circuit applications.

I suggest you read this post all the way through as I’ll walk you through the complete Introduction to BSS138 covering datasheet, pinout, features, and applications. Let’s jump right in.

Introduction to BSS138

• The BSS138 is an N-Channel MOSFET mainly used in low current and low voltage switching applications.
• It contains three terminals called, drain, source, and gate. At times the body is also included in the terminals, making it a four-terminal device.

• It is important to note that the gate terminal is electrically insulated and contains no current and is normally called an Insulated Gate FET (IG-FET).
• MOSFETs are categorized into two main types i.e. N-channel MOSFET and P-channel MOSFET. This chip BS138 falls under the category of N-channel MOSFET where electrons are major carriers. While holes are major carriers in P-channel MOSFETs.
• The electron movement is better than the hole movement. The reason, N-channel MOSFETs are preferred over P-channel MOSFETs for a range of applications.

• During working with high loads the P-channel MOSFETs turn hot while the N-channel MOSFETs remain cool.
• BSS138 comes in a continuous drain current of around 200mA and drain-source VDS voltage is 50V.
• The on-state resistance of this chip is 3.5, while the turn-off and turn-ON time is 20ns each.
• The compact and robust nature of this device makes it an ideal choice for portable applications including power management circuits and cell phones.
• The BSS138 is costly compared to its alternative 2n7002. Picking the alternative, you have to compromise with the threshold voltage and on-state resistance.

BSS138 Datasheet

BSS138 Pinout

BSS138 Features

• Logic Level N-Channel MOSFET
• Turn ON and Turn OFF time = 20ns each
• Continuous Drain Current (ID) = 200mA
• Comes in low on-state resistance

• Gate threshold voltage (VGS-th) = 0.5V
• On-state Resistance = 3.5?
• Drain Source Voltage (VDS) = 50V
• Gate threshold voltage (VGS-th) = 1.5V
• Available Package = SOT23 SMD

BSS138 Alternatives

• IRF540N
• IRF3205
• IRF1010E
• 2N7000
• BS170N

BSS138 Applications

• Employed as switching devices in electronic control units.
• Incorporated in low voltage low current applications.
• Used in automotive electronics.
• Used as power converters in modern electric vehicles.
• Used in servo motor control.

That’s all for today. Hope you’ve got a brief insight into the Introduction to BSS138. If you have any questions, you can approach me in the section below, I’d love to help you the best way I can. You’re most welcome to share your valuable feedback and suggestions around the content we share so we keep sharing quality content customized to your exact needs and requirements. Thank you for reading the post.