BSS138K vs BSS138W

This in-depth comparison of the BSS138K and BSS138W provides valuable insights into their specifications and key features. We cover important factors in detail, including RoHS compliance, REACH status, series, mounting style, package type, and other relevant characteristics. Presenting the differences side by side simplifies component selection, making it easier for you to select the best option for your specific application.

Technical review by ETEI Component Engineering Source: manufacturer documentation

Parts at a glance

Part A

BSS138K

Fairchild Semiconductor

Lifecycle: Active
Stock: 4504 PCS
Package: SOT-23
Series: Transistors - FETs, MOSFETs - Single

+BOM RFQ

Part B

BSS138W

onsemi

Lifecycle: Active
Stock: 7054 PCS
Package: SOT-323
Series: Transistors - FETs, MOSFETs - Single

+BOM RFQ

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Full specification comparison

Use manufacturer datasheets as the final authority.

Specification	BSS138K	BSS138W
Part Status	Active	Active
FET Type	N-Channel	N-Channel
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss)	50 V	50 V
Current - Continuous Drain(Id) @ 25°C	220mA (Ta)	210mA (Ta)
Drive Voltage(Max Rds On Min Rds On)	1.8V, 2.5V	4.5V, 10V
Rds On(Max) @ Id Vgs	1.6Ohm @ 50mA, 5V	3.5Ohm @ 220mA, 10V
Vgs(th)(Max) @ Id	1.2V @ 250µA	1.5V @ 1mA
Gate Charge(Qg)(Max) @ Vgs	2.4 nC @ 10 V	1.1 nC @ 10 V
Vgs(Max)	±12V	±20V
Input Capacitance(Ciss)(Max) @ Vds	58 pF @ 25 V	38 pF @ 25 V
Power Dissipation (Max)	350mW (Ta)	340mW (Ta)
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount

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