BF245A,112

Overview

The BF245A,112 is an N-channel silicon junction field-effect transistor (JFET) manufactured by NXP USA Inc. It is housed in a plastic package similar to TO-92 (DIN 41868). The device is engineered for use in DC, audio frequency (AF), and radio frequency (RF) amplifiers. As a depletion-mode component, it operates with a negative gate-source voltage to control current flow between the source and drain terminals.

Feature Summary

• N-channel silicon construction optimized for linear amplification applications
• Suitable for high-frequency RF and VHF/UHF signal processing
• Depletion-mode operation allowing standard biasing configurations

Applications

• Radio frequency amplification stages
• Audio frequency pre-amplifiers
• VHF/UHF circuit designs

Procurement Notes

Verify the specific suffix '112' against official NXP documentation to confirm packaging details and reel specifications. Ensure the component matches the required pinout for TO-92 compatible footprints. Cross-reference datasheets from authorized distributors to confirm availability and lot traceability before finalizing procurement orders.

Selection Notes

Select this JFET when designing low-noise amplifier circuits requiring stable gain at radio frequencies. Consider its depletion-mode characteristic for biasing simplicity in AF and RF stages. Evaluate thermal dissipation requirements relative to the plastic package constraints. Compare forward transfer admittance specifications against alternative JFETs like the 2SK series for specific impedance matching needs.

Part Context

This component belongs to the general-purpose JFET family used in analog signal conditioning. It serves as a fundamental active element in oscillator and amplifier topologies. The BF245 series variants (A, B, C) offer different gain groupings to accommodate precise circuit tolerances without requiring external trimming components during mass production assembly.

Replacement Considerations

Publicly confirmed substitutes include the BF245B and BF245C for similar amplification roles with varying gain characteristics. Alternative JFETs such as the 2SK30A or 2SK160A may be evaluated for 150kHz navigation signal applications, though pinouts and electrical parameters must be verified for direct compatibility.