BC618

Single Bipolar Transistors Overview

The BC618 is an NPN silicon Darlington transistor manufactured by onsemi. It features a collector-emitter voltage of 55 Vdc and a continuous collector current rating of 1.0 Adc. The device offers high DC current gain ranging from 2000 to 50,000 at specific test conditions. Total power dissipation is rated at 625 mW in TO-92 packages. Thermal resistance from junction to ambient is 200 °C/W. Operating and storage junction temperatures range from -55°C to +150°C.

Single Bipolar Transistors Feature Summary

• High DC current gain suitable for sensitive signal amplification
• Darlington configuration provides substantial current drive capability
• Low noise characteristics optimized for audio and low-level signal applications

Single Bipolar Transistors Applications

• Audio preamplifier stages
• General-purpose switching circuits
• Driver stages for relays or lamps

Single Bipolar Transistors Procurement Notes

Verify the specific ordering suffix (e.g., G for Pb-Free) against project requirements. Confirm package style matches the intended PCB footprint. Ensure thermal management aligns with the specified derating curves for ambient temperatures above 25°C. Validate component authenticity through authorized distribution channels.

Single Bipolar Transistors Selection Notes

Select this component when high current gain and low noise are required in a standard through-hole package. Consider the 55 V collector-emitter voltage limit for circuit design. Evaluate thermal constraints based on the 625 mW dissipation rating in TO-92 packaging. Compare against alternative Darlington transistors if higher voltage ratings are necessary.

Single Bipolar Transistors Part Context

This part belongs to the BC61x series of NPN silicon Darlington transistors produced by onsemi. These devices are designed for general-purpose amplification and switching applications requiring high input impedance and significant current gain. The series utilizes standard TO-92 and other common through-hole packages for ease of integration into legacy and modern electronic designs.

Single Bipolar Transistors Replacement Considerations

BC619 (PNP complement)

Single Bipolar Transistors FAQ

What is the maximum DC current gain (hFE) for the BC618?

The DC current gain ranges from 2000 to 50,000 depending on the collector current and test conditions specified in the datasheet.

Is the BC618 available in lead-free packages?

Yes, the BC618G variant is explicitly designated as a Pb-Free package according to the manufacturer's ordering information.

What is the thermal resistance from junction to ambient?

The thermal resistance from junction to ambient is 200 °C/W for the standard TO-92 package.