BF245C_D74Z

Overview

The BF245C_D74Z is an N-channel depletion-mode Junction Field-Effect Transistor (JFET) manufactured by onsemi. Designed for VHF and UHF amplifier applications, this component operates within a drain-source voltage range of ±30V and supports a maximum continuous drain current of 100mA. The device is housed in a TO-92 package, specifically identified as CASE 29-11 or TO-226AA, featuring three pins. It is rated for total device dissipation of 350mW at 25°C ambient temperature, with a derating factor of 2.8 mW/°C above this threshold. The operational storage channel temperature range spans from -65°C to +150°C.

Feature Summary

• N-channel silicon construction optimized for high-frequency signal amplification
• Depletion mode operation suitable for RF circuit biasing
• Robust thermal performance with defined derating characteristics

Applications

• VHF band amplifier stages
• UHF band oscillator circuits
• RF small-signal processing modules

Procurement Notes

Verify the specific suffix _D74Z against official onsemi documentation to confirm tape-and-reel packaging specifications. Ensure compliance requirements match project needs, noting that some related BF245 variants may have different RoHS statuses. Cross-reference the CASE 29-11 package code with mechanical drawings for PCB footprint accuracy during integration.

Selection Notes

Select this JFET when designing circuits requiring N-channel depletion behavior in VHF/UHF ranges. Compare gain-bandwidth products and noise figures against alternatives like the BF245A or BF245B if specific frequency response variations are critical. Confirm that the 30V breakdown voltage aligns with the system's power supply constraints.

Part Context

The BF245 series comprises N-channel JFETs historically produced by Fairchild Semiconductor and now managed by onsemi following corporate integration. Part numbers may transition from underscore to dash notation in updated catalogs. This component belongs to a family of RF transistors designed for low-noise amplification in broadcast and communication equipment.

Replacement Considerations

Direct substitutes include BF245A and BF245B, which share similar electrical characteristics but may differ in gain groupings. Verify pinout compatibility and thermal resistance values before swapping components in existing designs.