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UM9989 Datasheet

FAST MRI PROTECTION DIODES

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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
ƒ Available in surface mount
package.
ƒ
ƒ Metallurgical bond
ƒ
ƒ Planar passivated chip
ƒ
ƒ Non-magnetic construction
ƒ
ƒ Non cavity design
ƒ
ƒ Thermally matched configuration
ƒ
ƒ Low capacitance at 0 V bias
ƒ
ƒ Low conductance at 0 V bias
ƒ
ƒ Compatible with automatic
insertion equipment
APPLICATIONS/BENEFITS
ƒ MRI receiver protection
ƒ
ƒ 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


  Microsemi Electronic Components Datasheet  

UM9989 Datasheet

FAST MRI PROTECTION DIODES

No Preview Available !

www.DataSheet4U.com
UM9989
FAST MRI PROTECTION DIODES
Parameter
ELECTRICAL PARAMETERS @ 25°C (unless otherwise specified)
Symbol Conditions
Min Typ. Max Units
Forward Voltage (Note 1)
Reverse Break Down Voltage
(Note 1)
Reverse Current (Note1)
Capacitance
Conductance
IF = 10 mA , Tj = 25 ºC
VFm IF = 100 mA , Tj = 25 ºC
VBR IR = 100 uA
VR = 20 V, Tj = 25 ºC
Irm VR = 50 V, Tj = 25 ºC
CT VR = 0V, F = 1 MHZ
G VR = 0 V, F = 64 MHz
1.0 V
1.2 V
75 V
50 nA
500 nA
1.2 5
pF
40 uS
Note: 1 Short duration test pulse used to minimize self – heating effect.
Copyright 2003
Rev. 0, 2004-10-26
Microsemi
Page 2


Part Number UM9989
Description FAST MRI PROTECTION DIODES
Maker Microsemi Corporation
Total Page 6 Pages
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