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.
Table of Contents
Pinout
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).
| Pin Name | Description | |
| G | Gate | Controls the MOSFET, used to turn it on and off. |
| D | Drain | Current flows through the Drain, usually connected to a load(P-channel). |
| S | Source | Current comes out of transistor through the emitter, usually grounded(P-channel). |
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
Specs and Features
Given below are the technical specifications of FQP30N06L in a Tabular form.
| Feature | Value |
| Type | N Channel |
| Package | TO-92 |
| Drain-Source voltage | 60 V |
| Gate-Source voltage | ± 20 V |
| Gate Threshold voltage | 3 V Max. |
| Max. Drain Current- Continuous | 500 mA |
| Max. Drain Current- Pulsed | 1200 mA |
| Max. Junction temperature | -55 °C to 150 °C |
| Max. RDS(ON) (VGS = 10 V, ID = 200 mA) | 5 Ohm |
| Max. power dissipation | 830 mW |
Equivalent
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.
Applications/Uses
- 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
Datasheet
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.
FAQs
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
