UM9604

Overview

The UM9604 is a silicon PIN diode from the Microsemi UM9601–UM9608 series, designed for shunt mount applications in microstrip circuits. It features a hermetic fused-in-glass package with symmetrical metallurgical bonds to minimize parasitic inductance and capacitance. The device supports frequencies from UHF to 4 GHz and higher. Key electrical specifications include a reverse voltage rating of 400 V at 10 µA, a typical series resistance (Rs) of 1.7 Ω at 100 mA forward current and 100 MHz, and a total capacitance (CT) of 0.5 pF at 100 V reverse bias and 1 MHz. The I-region width is 150 µm, and the carrier lifetime is 1.0 µs.

Feature Summary

• Hermetic fused-in-glass construction with symmetrical full-faced metallurgical bonds
• Low inductance shunt mount package optimized for microstrip transmission lines
• High power handling capability exceeding discrete PIN diode chips
• Excellent distortion properties suitable for linear RF applications

Applications

• Microstrip antenna switches operating at 900 MHz and above
• Shunt switch elements in microwave circuits up to 4 GHz
• High isolation SPST and multi-throw switch configurations
• Low distortion attenuator applications

Procurement Notes

Verify the specific part number suffix against the manufacturer's current documentation to confirm packaging options and RoHS compliance status. Ensure that the ordering information matches the exact UM9604 variant required for your design. Cross-reference the datasheet revision date to confirm the validity of the electrical parameters and mechanical dimensions provided.

Selection Notes

Select the UM9604 when high reverse voltage ratings are required compared to the 100 V variants in the series. This component is recommended for applications demanding low insertion loss and high isolation in shunt-mounted microstrip designs. Consider its thermal resistance characteristics and power dissipation limits relative to the expected ambient temperature and bias conditions.

Part Context

The UM9604 belongs to the UM9601–UM9608 series developed by Microsemi (now part of Microchip Technology). These diodes are engineered specifically for integration into microstrip circuit boards, offering ruggedness and reliability for harsh environments. The series addresses handling issues associated with passivated chips while providing superior microwave performance and power handling capabilities.

Replacement Considerations

The UM9602 serves as the lower voltage (100 V) counterpart within the same series. For applications requiring lower cost or different power handling profiles, consider the UM9601 or UM9603 variants. Verify mechanical compatibility and electrical parameter alignment before substituting any other PIN diode models.