2N4091UB/TR

Overview

The MX2N4091UB/TR is a silicon N-channel Junction Field-Effect Transistor (JFET) manufactured by Microchip Technology. It features a single configuration housed in a TO-18-3 metal can package designed for through-hole mounting. Key electrical specifications include a drain-source breakdown voltage of 40 V and a gate-source breakdown voltage of -40 V. The device supports a maximum power dissipation of 360 mW and operates within a temperature range of -65°C to +175°C. At zero gate-source voltage, the drain current is specified at 30 mA, with an on-resistance of 30 Ohms.

Feature Summary

• High-temperature operation capability up to 175°C utilizing silicon technology
• Robust voltage handling with 40 V breakdown ratings for both drain-source and gate-source terminals
• Metal can packaging providing mechanical durability and thermal stability

Applications

• Low-noise amplifier circuits requiring high input impedance
• Analog switching applications demanding low leakage current
• Precision instrumentation front-ends operating in extreme environments

Procurement Notes

Verify the specific suffix designation when ordering, as it determines the packaging format. The standard MX2N4091UB typically utilizes bulk or individual unit packaging, whereas the /TR suffix indicates tape and reel delivery. Confirm RoHS compliance status directly with the manufacturer, as historical data suggests non-compliance for certain variants in this series. Ensure the procurement channel provides official datasheets matching the exact part number to avoid substitution errors.

Selection Notes

Select the MX2N4091UB/TR when designing circuits that require high-temperature resilience beyond standard commercial limits. The TO-18-3 package necessitates through-hole layout considerations, which may impact board density compared to surface-mount alternatives. Evaluate the 360 mW power dissipation limit against thermal management strategies for enclosed enclosures. Compare the 30 mA drain current specification against circuit requirements to ensure adequate signal drive capability without exceeding safe operating areas.

Part Context

This component belongs to Microchip's legacy JFET portfolio, often serving as a direct replacement for older Motorola or Fairchild equivalents in established designs. The 'MX' prefix typically denotes military or high-reliability grade screening, while the 'UB' suffix identifies the specific pinout and electrical characteristics. Understanding this lineage is critical for maintaining compatibility in aerospace, defense, and industrial control systems where long-term availability and parameter consistency are paramount.

Replacement Considerations

Publicly confirmed substitute part numbers for the MX2N4091UB/TR are not available in the provided documentation. Engineers should consult official cross-reference guides from Microchip Technology or verify compatibility with generic JFETs such as the 2N5457 or 2N5485 only after confirming pinout alignment and parameter margins.