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PDF UM9989 Data sheet ( Hoja de datos )
| Número de pieza | UM9989 | |
| Descripción | FAST MRI PROTECTION DIODES | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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UM9989
FAST MRI PROTECTION DIODES
DESCRIPTION
The UM9989 diode series was designed Receiver protector diodes appear directly
to protect MRI receivers from high RF across the input port of the receiver. They
energy fields including long RF pulses are connected in anti-parallel pairs to limit
and RF spike pulses present in most the RF carrier excursion in both polarities.
MRI machines. The UM9989 acts as a They must, therefore, exhibit extremely low
passive protector (limiter) for the MRI insertion loss, both in the “on” state (high
receiver. No forward bias voltage is
power present) and the “off” state (receiver
required to turn on the diode. It is self- power present) so as not to decrease the
biased by the RF transmitter pulse
receiver’s sensitivity. The UM9989 diodes
power. A switch driver is not needed are available in two package configurations
for this receiver protection application. for flexibility in design.
IMPORTANT: Forthemostcurrentdata,consultMICROSEMI’s website: http://www.microsemi.com
ABSOLUTE MAXIMUM RATINGS AT 25º C
(UNLESS OTHERWISE SPECIFIED)
Rating
Symbol
Value
Unit
Peak Repetitive Reverse Voltage
Working Peak Reverse Voltage
DC Blocking Voltage
RMS Reverse Voltage
Non-Repetitive Peak Forward Surge Current
8.3ms Single half sine wave
Storage Temperature
Operating Temperature
VRRM
VRWM
VR
V R (RMS)
IFSM
T stg
T op
75
50
2.5
-65 to +150
-65 to +150
V
V
A
ºC
ºC
KEY FEATURES
Available in surface mount
package.
Metallurgical bond
Planar passivated chip
Non-magnetic construction
Non cavity design
Thermally matched configuration
Low capacitance at 0 V bias
Low conductance at 0 V bias
Compatible with automatic
insertion equipment
APPLICATIONS/BENEFITS
MRI receiver protection
Body coil isolation
THERMAL CHARACTERISTICS
(UNLESS OTHERWISE SPECIFIED)
Thermal Resistance
@ Lead length = 3/8 inches
ROLA
100
ºC/Watt
Style “B”
Copyright 2003
Rev. 0, 2004-10-26
Style “SM”
Microsemi
Page 1
1 page  
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UM9989
FAST MRI PROTECTION DIODES
STYLE “SM”
STYLE “SM” FOOTPRINT
Copyright 2003
Rev. 0, 2004-10-26
PRODUCT PRELIMINARY DATA – Information contained in this document is pre-production
data, and is proprietary to Microsemi Corp. It may not be modified in any way without the express
written consent of Microsemi Corp. Product referred to herein is not guaranteed to achieve
preliminary or production status and product specifications, configurations, and availability may
change at any time.
Microsemi
Page 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet UM9989.PDF ] | |
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