BF245A,126

Overview

The BF245A,126 is an N-channel silicon junction field-effect transistor (JFET) manufactured by NXP Semiconductors. It is housed in a plastic TO-92 package, conforming to the DIN 41868 standard. This component is engineered for use in direct current, audio frequency, and radio frequency amplifier circuits. The device operates as a depletion-mode transistor, providing high input impedance and low noise characteristics suitable for signal amplification tasks in consumer and industrial electronics.

Feature Summary

• N-channel silicon construction for reliable semiconductor performance
• Plastic TO-92 packaging compatible with standard through-hole mounting
• Optimized for DC, audio frequency, and RF amplifier applications

Applications

• Radio frequency signal amplification stages
• Audio frequency pre-amplifier circuits
• Direct current switching and amplification

Procurement Notes

Verify the specific suffix '126' against official NXP documentation to confirm reel or tape-and-reel packaging specifications. Ensure the ordering part number matches the exact electrical binning requirements for your design. Cross-reference with Siemens Semiconductor Group historical data if sourcing legacy equivalents, as NXP acquired these assets. Confirm RoHS compliance status for the specific manufacturing batch.

Selection Notes

Select this JFET when designing circuits requiring high input impedance and low noise in VHF/UHF ranges. Compare forward transfer admittance parameters against alternatives like the 2SK30A or 2SK160A for specific gain requirements at 150kHz or higher frequencies. Ensure the TO-92 package fits the thermal and spatial constraints of the target PCB layout. Validate that the depletion-mode operation aligns with the biasing strategy of the amplifier stage.

Part Context

The BF245 series originates from Siemens Semiconductor Group and is now managed by NXP Semiconductors following corporate acquisitions. The family includes variants such as BF245B and BF245C, differentiated primarily by gain groupings. These transistors are widely recognized in legacy electronic design for their stability in RF and AF applications. The BF245A represents the standard gain variant within this established product line.

Replacement Considerations

Publicly confirmed substitute part numbers include the BF245B and BF245C from the same manufacturer family. Other compatible JFETs mentioned in technical comparisons for similar amplification roles include the 2SK30A, 2SK160A, and 2SK241. Verify pinout compatibility and electrical parameter overlaps before substituting.