J174

Overview

The J174 is a P-Channel Silicon Junction Field Effect Transistor (JFET) designed for low-level analog switching applications. It is available in TO-92 and SOT-23 packages. Key electrical characteristics include a Drain-Gate Voltage of -30 V, Gate-Source Voltage of 30 V, and a Zero-Gate Voltage Drain Current (IDSS) range of -20 mA to -100 mA at VDS = -15 V. The device features a Drain-Source On Resistance (rDS(on)) maximum of 85 Ω and a Gate-Source Cutoff Voltage (VGS(off)) range of 5.0 V to 10 V. Total device dissipation is 350 mW in the TO-92 package.

Feature Summary

• Designed specifically for low-level analog switching, sample and hold circuits, and chopper-stabilized amplifiers.
• Features interchangeable source and drain terminals, simplifying circuit layout and design flexibility.
• Utilizes Process 88 technology to ensure consistent performance across operating temperatures.

Applications

• Low-level analog signal switching
• Sample and hold circuits
• Chopper-stabilized amplifier inputs

Procurement Notes

Verify the specific package variant required, as the J174 is manufactured in both TO-92 and SOT-23 configurations with distinct pinouts and thermal characteristics. Confirm that the ordering suffix corresponds to the desired packaging style, such as tape and reel or bulk, as these do not alter the electrical function but affect handling and assembly processes. Ensure compatibility with the intended PCB footprint before procurement.

Selection Notes

Select the J174 when a P-Channel JFET with high IDSS and low rDS(on) is required for precision analog switching. Compare against J175, J176, and J177 if different IDSS or VGS(off) ranges are needed to match specific circuit thresholds. Consider the SOT-23 version for surface-mount designs requiring smaller footprints, while retaining TO-92 for through-hole applications needing higher power dissipation capabilities.

Part Context

The J174 belongs to the J174/J175/J176/J177 family of P-Channel Switches originally developed by Fairchild Semiconductor. This family shares identical physical dimensions and pinouts but varies in electrical parameters like IDSS and VGS(off) to provide options for different switching speeds and leakage requirements. The MMBFJ17x series represents the surface-mount equivalent of this family.

Replacement Considerations

Direct functional substitutes within the same family include J175, J176, and J177, which share the same package and pinout but offer different IDSS and VGS(off) specifications. Surface-mount replacements include the MMBFJ174, MMBFJ175, MMBFJ176, and MMBFJ177 in SOT-23 packages. Verify parameter compatibility before substitution.

FAQ

Are the source and drain terminals interchangeable on the J174?

Yes, the datasheet explicitly notes that the source and drain terminals are interchangeable, allowing for flexible circuit orientation.

What is the maximum Drain-Gate Voltage for the J174?

The absolute maximum Drain-Gate Voltage (VDG) rating for the J174 is -30 V.

How does the J174 differ from the J175?

The primary difference lies in their electrical characteristics. The J174 has a higher IDSS range (-20 mA to -100 mA) and a higher VGS(off) range (5.0 V to 10 V) compared to the J175, which has lower values for these parameters.