BS270 MOSFET — Specifications & Equivalents

About the BS270

The BS270 is an N-channel MOSFET with a drain–source voltage (V_DS) rating of 60 V, a continuous drain current (I_D) of 0.4 A and an on-resistance (R_DS(on)) of 2 Ω. It can dissipate up to 0.625 W and is rated to a junction temperature of 150 °C. It is supplied in the TO92 package.

At a glance

• Type: N-channel MOSFET
• Max drain–source voltage (V_DS): 60 V
• Max continuous drain current (I_D): 0.4 A
• On-resistance (R_DS(on)): 2 Ω
• Power dissipation (P_D): 0.625 W
• Max junction temperature (T_J): 150 °C
• Package: TO92

Typical applications

With its 60 V drain–source rating the BS270 sits in the mid-range class of switching MOSFETs, typically found in 24 V and 48 V industrial and battery systems, motor drives and H-bridges and load and hot-swap switching.

At 0.4 A it is aimed at small-signal and light-load switching rather than power conversion.

On-resistance of 2 Ω is relatively high, so this part is better suited to low duty-cycle or low-current switching than to continuous high-current conduction.

Gate drive and switching notes

Keep gate–source voltage within the ±20 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.

Choosing a replacement for the BS270

A drop-in substitute for the BS270 must be the same N-channel type and offer a drain–source rating of at least 60 V, a continuous drain current rating of at least 0.4 A and an on-resistance no higher than 2 Ω if efficiency and heat matter.

Mechanically, check the replacement against the TO92 footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.

Where the application switches inductive loads or runs near the voltage limit, keep extra headroom rather than choosing a part that only just meets the original numbers.

Frequently asked questions

What is the BS270?

The BS270 is an N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 60 V drain-source and 0.4 A continuous drain current.

What is the maximum voltage of the BS270?

The BS270 has a maximum drain-source voltage (Vds) of 60 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.

How much current can the BS270 handle?

It is rated for 0.4 A of continuous drain current, with power dissipation limited to 0.625 W. Real-world capability depends on your heatsinking and ambient temperature.

What is the on-resistance of the BS270?

On-resistance (Rds(on)) is 2 Ω. Multiply by the square of your load current to estimate conduction loss.

What package does the BS270 come in?

It is listed in TO92. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the BS270?

No verified equivalents are listed yet. Choose a part of the same polarity that meets or exceeds every rating above and shares a compatible package and pinout.