onsemi

BSS138

BSS138 Description

The BSS138 from onsemi is a N-channel enhancement-mode MOSFET designed for low-voltage, low-power applications. With a drain-to-source voltage (Vdss) rating of 50V and a continuous drain current (Id) of 220mA, it is optimized for high-efficiency switching in compact designs. The device features a low threshold voltage (Vgs(th) ≤ 1.6V @ 250µA) and a low on-resistance (Rds(on) ≤ 3Ω @ 500mA, 10V), ensuring minimal power loss. Packaged in a SOT-23-3 surface-mount form factor, it is ideal for space-constrained PCB layouts.

BSS138 Features

• Low Input Capacitance (Ciss ≤ 27pF @ 25V) for fast switching performance.
• Low Gate Charge (Qg ≤ 2.4nC @ 10V) reduces drive power requirements.
• Wide Vgs Range (±20V) for robust gate control flexibility.
• High Power Dissipation (350mW) ensures reliability in demanding conditions.
• RoHS3 & REACH Compliant, meeting environmental regulations.
• MSL 1 (Unlimited) moisture sensitivity for extended shelf life.
• Operating Temperature up to 150°C (TJ), suitable for industrial environments.

BSS138 Applications

The BSS138 excels in low-side switching, load switching, and signal amplification due to its fast switching speed and low Rds(on). Key applications include:

• Portable Electronics: Power management in smartphones, tablets, and wearables.
• Automotive Systems: Sensor interfaces and low-power control circuits.
• Industrial Controls: Relay drivers, motor control, and logic-level translation.
• IoT Devices: Energy-efficient switching for battery-operated sensors.
• DC-DC Converters: Secondary-side synchronous rectification.

Conclusion of BSS138

The BSS138 stands out as a high-performance, cost-effective MOSFET for low-voltage applications, combining low power loss, compact packaging, and robust thermal performance. Its low gate drive requirements and fast switching make it ideal for modern electronics where efficiency and space savings are critical. Whether in consumer, automotive, or industrial systems, the BSS138 delivers reliable performance while meeting stringent environmental standards.