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UMX1089 - LOW LOSS MRI PROTECTION DIODES

General Description

The UMX1089 diode series was designed to protect MRI receivers from high RF energy fields including long RF pulses and RF spike pulses present in most MRI machines.

The UMX1089 acts as a passive protector (limiter) for the MRI receiver.

No forward bias voltage is required to turn on the diode.

Key Features

  • Available in surface mount package.
  • Metallurgical bond.
  • Passivated chip.
  • Low magnetic construction.
  • Non cavity design.
  • Optimized for low loss performance.
  • Low capacitance at 0V bias.
  • Low conductance at 0V bias.
  • Compatible with automatic insertion equipment.
  • RoHS Compliant 1 Note 1: RoHS compliant versions are supplied with a matte Tin finish or Silver finish. RoHS part numbers are: UMX1089B.
  • matte Tin finish UMX1089SM.
  • Silver.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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UMX1089 LOW LOSS MRI PROTECTION DIODES ® RoHS Compliant GENERAL DESCRIPTION The UMX1089 diode series was designed to protect MRI receivers from high RF energy fields including long RF pulses and RF spike pulses present in most MRI machines. The UMX1089 acts as a passive protector (limiter) for the MRI receiver. No forward bias voltage is required to turn on the diode. It is self-biased by the RF transmitter pulse power. A switch driver is not needed for this receiver protection application. The UMX1089 process has been optimized for lower loss performance. Receiver protector diodes appear directly across the input port of the receiver. They are connected in antiparallel pairs to limit the RF carrier excursion in both polarities.