BS170 MOSFET Pinout, Datasheet, Equivalent & Specs

Last updated on March 28th, 2024 at 01:18 pm

BS170 is an N-channel Enhancement MOSFET capable of switching 60 V. It has a maximum drain current rating of 500 mA(continuous) and 1200 mA(pulsed), Drain to Source resistance of 1.2 ohms(typical), and maximum power dissipation rating of 830 mW. BS170 is often used in place of 2N7000 due to its similar characteristics.

Its Gate Threshold voltage rating is 3 V(VDS = VGS, ID = 1 mA). Hence, BS170 is a logic-level MOSFET.

This MOSFET is ideal for low-power switching applications such as small lamps, relays, and motors.

It comes in the TO-92 package and MBBF170, its SMD version, is available in the SOT-23 package. P channel BS250P is its counterpart.


Just like any other Mosfet, its pinout has three pins: Drain, Gate, and Source respectively from left to right(flat side with the leads pointed downward).

BS170 Mosfet Pinout
BS170 Mosfet Pinout
Pin NameDescription
GGateControls the MOSFET, used to turn it on and off.
DDrainCurrent flows through the Drain, usually connected to a load(P-channel).
SSourceCurrent comes out of transistor through the emitter, usually grounded(P-channel).
Pin configuration of BS170 transistor

Note: ONSEMI recently released a new version of BS170 in December 2021. Its Pinout is different from all other manufacturer's designs: The Gate and Source pins are swapped in this new version. The pinout of ONSEMI's BS170 is shown below
New BS170 Pinout by ONSEMI
New BS170 Pinout by ONSEMI

Specs and Features

Given below are the technical specifications of FQP30N06L in a Tabular form.

TypeN Channel
Drain-Source voltage60 V
Gate-Source voltage± 20 V
Gate Threshold voltage3 V Max.
Max. Drain Current- Continuous500 mA
Max. Drain Current- Pulsed1200 mA
Max. Junction temperature-55 °C to 150 °C
Max. RDS(ON) (VGS = 10 V, ID = 200 mA)5 Ohm
Max. power dissipation830 mW
BS170 Specs Table


2N7000, 2N7002/NDS7002A(SMD version), IRFZ44, IRF540N, and IRF3205 are the equivalent BS170 N channel MOSFETs.

P-Channel Counterpart of BS170

BS250P P channel MOSFET is the complimentary pair of BS170 N channel MOSFET.


  • For Switching loads below 500 mA(continuous) and 1200 mA pulsed.
  • Controlling small servo motors
  • As power MOSFET gate drivers
  • Low power switching applications: Small lamps, motors, and relays.
  • In LED flashers and dimmers


To download the datasheet of the new BS170 MOSFET by ONSEMI, click here.

To download the datasheet of similar BS170 from other manufacturers, click here.

Where to buy?

You can easily find this MOSFET in your local electronics store. For online purchases, we recommend this best deal on Amazon:

Dimensions/2D model

Given below is the 2D model of BS170 in T0-92 package or enclosure. All the dimensions like height, width, and length are shown in it.

BS170 Mosfet Dimensions- 2D Model
BS170 mosfet dimensions- 2D model


What type of Mosfet is BS170?

BS170 is an N-channel enhancement MOSFET. It is ideal for low-power switching applications such as small lamps, relays, and motors. It comes in a TO-92 package as well as in an SMD enclosure(MMBF170). MOSFETs are a type of transistor that is designed to work in conditions where switching speeds and efficiency need to be fast. They’re used for applications such as power supplies and converters.

Is BS170 a power Mosfet?

No, it is not a power MOSFET due to its low current/voltage characteristics and TO-92 package. It’s equivalent to a switching transistor but with slightly higher power ratings. MOSFET like FQP30N06L is called a power MOSFET.

Is BS170 logic level MOSFET?

Yes, it is a logic-level MOSFET due to its low Gate Threshold voltage of 3 V (VDS = VGS, ID = 1 mA). Meaning it can turn ON fully by using the logic level(3.3V OR 5V) of a microcontroller

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Ankit Negi

I am an electrical engineer by profession who loves to tinker with electronic devices and gadgets and have been doing so for over six years now. During this period, I have made many projects and helped thousands of students through my blog and YouTube videos. I am active on Linkedin.

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