J109

Overview

The onsemi J109 is a single N-channel Junction Field-Effect Transistor (JFET) designed for general-purpose switching and amplification applications. It utilizes silicon technology and is housed in a TO-92 through-hole package with three pins. The device supports a maximum drain-source current of 40 mA at 15 V and features a low on-resistance of 12 Ω. It operates within a junction temperature range of -55°C to 150°C, with a maximum power dissipation of 625 mW. The breakdown voltage is rated at 25 V, and the cutoff voltage is specified at 2 V when tested at 10 nA input current.

Feature Summary

• N-channel depletion mode operation suitable for analog and digital switching circuits
• Robust thermal performance with a wide operating temperature range extending to 150°C
• Low on-resistance characteristic enabling efficient signal handling
• Through-hole TO-92 packaging facilitating standard board integration

Applications

• General-purpose electronic switching circuits
• Analog signal amplification stages
• High-temperature industrial control environments

Procurement Notes

Verify the specific ordering suffix against official onsemi documentation to confirm exact electrical tolerances and testing criteria. Ensure the procurement channel provides genuine components with traceable manufacturing data. Cross-reference the part number with the latest datasheet revisions to confirm compliance with current specifications before finalizing purchase orders.

Selection Notes

Select this component for designs requiring an N-channel JFET with moderate current handling capabilities. The TO-92 package is appropriate for prototyping or low-volume production where through-hole mounting is preferred. Consider the 625 mW power dissipation limit when designing heat management strategies for enclosed enclosures or high ambient temperature conditions.

Part Context

The J109 belongs to the family of small-signal junction field-effect transistors manufactured by onsemi. These devices are engineered for reliability in discrete semiconductor applications. The TO-92 form factor represents a standard cylindrical plastic package widely used in consumer electronics and industrial instrumentation for low-power transistor functions.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Engineers should consult official cross-reference guides or manufacturer compatibility lists to identify equivalent N-channel JFETs with matching pinouts and electrical ratings.