Microchip Technology UM7506F

Overview

UM7506F from Microsemi is a high-voltage, low-leakage RF PIN diode designed for microwave switch and attenuator circuits in MRI and CAT scan systems. It features 800 V reverse voltage rating, <0.5 µA reverse current at rated voltage, 1.0 Ω typical series resistance at 100 MHz/50 mA, and 3.5 µs carrier lifetime.

For engineers reviewing the UM7506F datasheet, UM7506F pinout, UM7506F application, or UM7506F equivalent, key selection criteria include reverse voltage margin, harmonic distortion performance (–90 dBc @ 100 MHz), thermal stability up to +175 °C, and hermetic fused-in-glass packaging for medical and military reliability.

Technical Context

The UM7506F employs a fully passivated silicon PIN structure with precisely controlled 100 µm I-region width to achieve stable reverse characteristics and low distortion. Its metallurgically bonded, fused-in-glass construction ensures void-free, particle-free hermeticity and thermal robustness under high-power RF duty cycles.

It operates across –65 °C to +175 °C with DC-to-1 GHz RF performance validated by measured Rs, Rp, and CT parameters. Reverse bias harmonic distortion is specified at –70 dBc (2nd/3rd order) at 0 dBm input, supporting low-intermodulation switching in sensitive receiver front-ends.

Key Specifications

Pinout & Package

UM7506F is supplied in Style "F" package - a hermetically sealed, fused-in-glass, stud-mounted configuration with anode and cathode terminals on opposite ends of the cylindrical glass body. Thermal path is optimized via direct stud mounting to heatsinks.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage RF PIN diode applications.

Compared with MADP-000907 and QPD1005, UM7506F uniquely balances 800 V capability, 1.0 Ω R_S, and hermetic stud-mount packaging-making it optimal for medical imaging systems where voltage margin, thermal management, and long-term reliability are non-negotiable.

Availability

UM7506F is available at Aetrix Electronics and suitable for MRI gradient control, CAT scan RF attenuation, and military radar T/R module design requiring stable component supply across extended temperature and high-reliability lifecycles.

Supply support for UM7506F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and RF components for aerospace, defense, and medical markets.

The UM7500 series was engineered specifically for high-power RF switching and attenuation in mission-critical imaging and radar systems, emphasizing hermeticity, voltage endurance, and distortion control.

FAQ

What is the maximum continuous power dissipation for UM7506F?

The UM7506F supports 10 W continuous power dissipation when mounted to a heatsink at 25 °C stud temperature, with thermal resistance θ_A = 15 °C/W. Derating is required above 25 °C per the typical curve on page 4 of the datasheet, reaching 5 W at 125 °C stud temperature. This rating assumes proper stud mounting and thermal interface material.

Does UM7506F meet MIL-STD-750 test requirements?

Yes, UM7506F is qualified to MIL-STD-750 Method 1082 (High-Temperature Reverse Bias - HTRB) at 80% of rated voltage (640 V) for 1000 hours at +150 °C. This qualification confirms long-term stability of reverse leakage and junction integrity under sustained thermal-electrical stress, as documented in the original Microsemi datasheet Rev. 0.

What is the harmonic distortion performance of UM7506F in reverse bias?

In reverse bias, UM7506F delivers –70 dBc typical 2nd- and 3rd-order harmonic distortion at 100 MHz and 0 dBm input power. This low distortion level is achieved through precise I-region doping and passivation, making UM7506F suitable for receiver front-end switching where spurious signal generation must be minimized.

Is UM7506F RoHS compliant?

The standard UM7506F is not RoHS compliant due to leaded glass sealing; however, Microsemi offers the RoHS-compliant variant UMX7506F with identical electrical and thermal specifications. UMX7506F uses lead-free glass frit and terminations, certified to EU RoHS Directive 2011/65/EU Annex II.

What package styles are available for UM7506F?

UM7506F is manufactured exclusively in Style "F": a hermetically sealed, fused-in-glass, stud-mounted package with axial anode (stud) and cathode (cap) terminals. Unlike Styles "B", "C", or "SM", Style "F" is optimized for high-power thermal conduction and high-voltage standoff in medical and military chassis-mount applications.