MMBFJ210

Overview

The MMBFJ210 is an N-channel Junction Field-Effect Transistor (JFET) manufactured by onsemi. It is designed for low-noise and high-speed switching applications, housed in a compact SOT-23 surface-mount package with three pins. The device features a maximum drain-source voltage of 50 V and a continuous drain current of 10 mA. With a typical gate-source cutoff voltage of -1.0 V and a maximum power dissipation of 350 mW, it operates within a temperature range of -55°C to +150°C. Its low input capacitance and high input impedance make it suitable for precision analog circuits.

Feature Summary

• N-channel JFET configuration optimized for low-noise signal processing
• Compact SOT-23 surface-mount packaging for space-constrained designs
• High input impedance characteristic suitable for buffer applications

Applications

• Low-noise preamplifiers in audio and instrumentation systems
• Analog switches and multiplexers requiring high isolation
• Voltage-controlled resistors in variable gain amplifier circuits

Procurement Notes

Verify the specific ordering suffix against the official datasheet to confirm pinout and electrical tolerances. Ensure the component meets RoHS compliance requirements for your target market. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Confirm availability status as production lifecycles may change without notice.

Selection Notes

Select this component when a low-noise N-channel JFET is required in a small footprint. Compare the gate-source cutoff voltage specifications against circuit biasing requirements. Evaluate the maximum power dissipation limits relative to the expected thermal environment. Consider the SOT-23 package compatibility with existing PCB layout constraints.

Part Context

The MMBFJ210 belongs to onsemi's discrete JFET portfolio, which includes various channel types and package options. It serves as a complementary or alternative device to other N-channel JFETs in the same series. The component is categorized under general-purpose discrete semiconductors rather than specialized power devices.

Replacement Considerations

Check for direct pin-compatible substitutes such as the 2N5457 or BF862 if available from other manufacturers. Verify that replacement devices meet or exceed the 50 V breakdown voltage and 10 mA current ratings. Ensure the replacement maintains similar noise figure characteristics for critical analog applications.