U423 TO-78 7L ROHS

Overview

The U423 is a dual N-channel Junction Field-Effect Transistor (JFET) manufactured by Linear Integrated Systems, Inc. It features a TO-78-7 hermetic metal package designed for through-hole mounting. The device supports a drain-source voltage of 40 V and dissipates up to 500 mW of power. Input capacitance is specified at 3 pF. The junction temperature range extends from -55°C to 150°C. This component is classified as an active discrete semiconductor suitable for specialized analog applications requiring high reliability.

Feature Summary

• Dual N-channel configuration within a single hermetic metal package
• High thermal stability with a wide operating junction temperature range
• Low input capacitance for signal integrity preservation
• Through-hole mounting capability for robust mechanical attachment

Applications

• Precision analog signal processing circuits
• High-reliability aerospace and defense electronics
• Low-noise amplifier stages in instrumentation systems

Procurement Notes

Verify the specific manufacturer datasheet for the U423 TO-78 7L ROHS to confirm electrical tolerances and pinout configurations prior to integration. Ensure that the procurement source provides traceable documentation matching the Linear Integrated Systems, Inc. specifications. Cross-reference the RoHS compliance status if environmental regulations apply to the final assembly. Confirm that the TO-78-7 package dimensions align with the target PCB layout constraints.

Selection Notes

Select this component when a dual N-channel JFET is required in a hermetic metal package for harsh environments. The TO-78-7 form factor offers superior protection against moisture and contaminants compared to plastic packages. Consider the 40 V breakdown voltage and 500 mW power dissipation limits when designing biasing networks. The low input capacitance makes it suitable for high-frequency or sensitive signal paths where minimal loading is critical.

Part Context

Linear Integrated Systems, Inc. specializes in specialty small-signal discrete semiconductors. The U423 belongs to their lineup of JFETs, which are distinct from standard MOSFETs due to their normally-on characteristic and high input impedance. These devices are often used in applications where linearity and low noise are paramount. The company's focus on hermetic packaging ensures longevity in demanding operational conditions.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users must consult official distributor databases or manufacturer cross-reference guides to identify compatible alternatives. Ensure any replacement matches the TO-78-7 package outline and electrical characteristics precisely.