BF959ZL1

Overview

The BF959ZL1 is an NPN silicon VHF transistor manufactured by onsemi in a TO-92 plastic package. It features a collector-emitter voltage of 20 Vdc and a continuous collector current of 100 mAdc. The device provides a minimum DC current gain (hFE) of 35 at 5 mA and 40 at 20 mA, with a typical current-gain bandwidth product (fT) of 700 MHz at 20 mA. Thermal characteristics include a junction-to-ambient resistance of 200 °C/W and a maximum operating temperature range from -55°C to +150°C.

Feature Summary

• Designed for Very High Frequency (VHF) applications
• Optimized for low noise figure performance
• High current-gain bandwidth capability

Applications

• VHF amplification stages
• Low-noise RF circuits
• General-purpose VHF signal processing

Procurement Notes

Verify the specific ordering suffix ZL1 corresponds to the 2000-unit ammo pack configuration when sourcing. Confirm RoHS compliance status if required, as standard versions may differ from Pb-Free variants. Ensure the TO-92 pinout matches Style 21 (Collector-Base-Emitter) for proper circuit integration.

Selection Notes

Select this component for designs requiring high-frequency operation up to VHF bands with moderate power dissipation limits. Consider the 200 °C/W thermal resistance for ambient cooling requirements. Verify that the 20 Vdc breakdown voltage meets the circuit's peak voltage demands.

Part Context

This part belongs to the BF959 family of NPN silicon transistors designed specifically for VHF frequency ranges. The ZL1 suffix indicates a specific packaging format within the broader BF959 product line, which includes bulk and tape-and-reel options.

Replacement Considerations

Direct substitutes are not explicitly listed in the provided documentation. Evaluate other VHF NPN transistors with similar fT ratings and voltage/current specifications for potential cross-compatibility.