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Product Detailed Parameters
- Description：SI PPIN HERMETIC MELF
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Diode Type：PIN - Anti-Parallel
- Voltage - Peak Reverse (Max)：-
- Current - Max：-
- Capacitance @ Vr, F：8pF @ 0V, 1MHz
- Resistance @ If, F：-
- Power Dissipation (Max)：-
- Operating Temperature：-65°C ~ 150°C
- Package / Case：Module
- Supplier Device Package：-
- Grade：-
- Qualification：-
Download product information
Overview
The UMX9989AP is a dual ultra-low magnetic moment fast diode module designed for MRI applications. It features two matched anti-parallel PIN diodes in a hermetic MELF package. Key electrical parameters at 25°C include forward voltage of ±0.38 V (10 µA) and ±1.2 V (1 A), capacitance of 4 pF at 1 MHz and 8 pF at 64 MHz, conductance of 80 µS at 64 MHz, and parallel resistance of 12 kOhms at 64 MHz. The device supports an operating temperature range of -65 to +150 °C and a non-repetitive peak forward surge current of 2 A.
Feature Summary
- Ultra-low magnetic construction suitable for sensitive MRI environments
- Dual matched anti-parallel diode configuration minimizes parasitic inductance
- Hermetic metallurgical bond with planar passivated chip
- Compatible with automatic insertion equipment
Applications
- MRI receiver protection from high RF energy fields
- Passive switching of surface coil detuning circuits
- Passive blocking circuits for MRI coils
- Implementation of semi-active detune designs with external PIN diodes
Procurement Notes
Verify the specific ordering suffix and package type against the manufacturer's official documentation before procurement. Confirm RoHS compliance status and availability through authorized Microchip or Microsemi distributors. Ensure the component meets the required hermetic sealing standards for the intended medical imaging application environment.
Selection Notes
Select this component for MRI systems requiring passive protection without active driver circuits. The dual matched pair design simplifies assembly and reduces polarity errors compared to discrete components. Verify that the low capacitance and conductance values meet the noise figure requirements of the specific LNA being protected.
Part Context
The UMX9989AP belongs to the UMX series of ultra-low magnetic moment PIN diodes developed by Microsemi (now Microchip Technology). This series is specifically engineered to minimize interference with the strong magnetic fields used in Magnetic Resonance Imaging machines, distinguishing it from standard RF switching diodes.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. Consult the manufacturer for potential cross-reference options.
