BF245B,126

Overview

The BF245B is an N-channel silicon junction field-effect transistor (JFET) designed for general-purpose applications. It features a plastic TO-92 variant package with interchangeable drain and source connections, supporting frequencies up to 700 MHz. Key electrical parameters include a maximum drain-source voltage of ±30 V and a total power dissipation of 300 mW at 75 °C. The device exhibits a typical forward transfer admittance of 6.5 mS at 1 kHz and a reverse transfer capacitance of 1.1 pF at 1 MHz. Drain current ranges from 6 mA to 15 mA under zero gate-source bias conditions.

Feature Summary

• Symmetrical structure allowing interchangeability of drain and source connections
• Capable of operation at radio frequencies up to 700 MHz
• Low noise figure suitable for sensitive signal amplification

Applications

• Low Frequency (LF) amplifiers
• High Frequency (HF) amplifiers
• DC amplifiers

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm exact packaging and reel specifications. Ensure that the component meets all required environmental and thermal operating limits for the intended application design. Cross-reference the datasheet revision date to ensure compatibility with current manufacturing standards.

Selection Notes

Select this component when symmetrical JFET characteristics are required for circuit flexibility. The BF245B offers a balance of moderate gain and low noise performance suitable for analog signal processing. Consider the TO-92 package constraints regarding thermal dissipation and lead length requirements during PCB layout planning.

Part Context

This part belongs to the BF245 series of N-channel silicon field-effect transistors, which also includes the BF245A and BF245C variants. These devices share identical physical packages and basic structural features but differ in their specific electrical thresholds and current ratings. The series is categorized as general-purpose discrete semiconductors within the NXP portfolio.

Replacement Considerations

Direct substitutes include the BF245A and BF245C models from the same product family. Other generic N-channel JFETs may be considered if their electrical parameters align with the specific circuit requirements, though pinout and package compatibility must be verified.

FAQ

Can the drain and source terminals be swapped?

Yes, the BF245B features a symmetrical structure that allows for the interchangeability of drain and source connections.

What is the maximum operating frequency?

The device supports frequencies up to 700 MHz.

Is this component automotive qualified?

No, unless explicitly stated otherwise in the datasheet, this product is not suitable for automotive use and lacks automotive qualification testing.