Product Detail

MADP-009989
Fast MRI Protection Diode
The MADP-009989 diode was designed to protect MRI receivers from high RF energy fields including long RF pulses and RF spike pulses present in most MRI machines. This diode 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. Receiver protector diodes appear directly across the input port of the receiver. They are connected in anti-parallel pairs to limit the RF carrier excursion in both polarities. They must, therefore, exhibit extremely low insertion loss, both in the “on” state (high power present) and the “off” state (receiver power present) so as not to decrease the receiver’s sensitivity. This diode is available in two package configurations for flexibility in design. The MADP-009989 is ideally suited for MRI Receiver Protection and Body Coil Isolation.
Features
  • Available in Surface Mount Package & Axial Lead
  • Thermally Matched Configuration
  • Passivated Chip
  • Low Capacitance @ 0 V bias
  • Ultra Low Magnetic Construction
  • Low Conductance @ 0 V bias
  • Non Cavity Design
  • RoHS* Compliant
  • Compatible with Automatic Insertion Equipment
Applications
  • MRI
Specifications
  • Resistance: 0.3 Ohm
  • Total Capacitance: 1.2 pF
  • Breakdown Voltage, Minimum: 75 V
  • Lifetime: 6,500 nS
  • CW Power Dissipation: 4 W
  • Min Frequency: 30 MHz
  • Max Frequency: 1,500 MHz
Package
  • Surface Mount
Package Category
  • Axial Lead
ROHS
  • Yes
Contact Info
Part Number Package MACOM Richardson RFPD DigiKey Mouser Richardson Electronics
MADP-009989-14320T
Diode, Pin, GlassMelf
DIE
In Stock: 13
Buy
MADP-009989-14340T
Diode, Pin, Glass, Axial-Leaded
SURMOUNT Inquire Buy

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