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參數(shù)資料
| 型號： | UM9989 |
| 廠商： | Microsemi Corporation |
| 英文描述： | FAST MRI PROTECTION DIODES |
| 中文描述： | 快速磁共振保護二極管 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 241K |
| 代理商： | UM9989 |
Microsemi
Page 1
Copyright
2003
Rev. 0, 2004-10-26
W
M
.
C
UM9989
FAST MRI PROTECTION DIODES
DESCRIPTION
The UM9989 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 UM9989 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. The UM9989 diodes
are available in two package configurations
for flexibility in design.
IMPORTANT:
For the most current data, consult
MICROSEMI
’s website:
http://www.microsemi.com
ABSOLUTE MAXIMUM RATINGS AT 25o C
(UNLESS OTHERWISE SPECIFIED)
Rating
Symbol
V
RRM
V
RWM
V
R
V
R (RMS)
Value
Unit
Peak Repetitive Reverse Voltage
Working Peak Reverse Voltage
DC Blocking Voltage
75
V
RMS Reverse Voltage
Non-Repetitive Peak Forward Surge Current
8.3ms Single half sine wave
Storage Temperature
50
V
I
FSM
2.5
A
T stg
-65 to +150
oC
Operating Temperature
T op
-65 to +150
oC
THERMAL CHARACTERISTICS
(UNLESS OTHERWISE SPECIFIED)
Thermal Resistance
@ Lead length = 3/8 inches
R
OLA
100
oC/Watt
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
Style “B” Style “SM”
U
M
9
9
8
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UM9995 | ULTRA LOW MAGNETIC MRI SWITCHING DIODES |
| UMA5818 | ULTRAMITTE SURFACE MOUNT SCHOTTKY BARRIER RECTIFIERS |
| UMA5819 | ULTRAMITTE SURFACE MOUNT SCHOTTKY BARRIER RECTIFIERS |
| UMC1N | Very low drop 1A regulator |
| UMC5N | QUAD DARLINGTON SWITCH |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UM9989_09 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:FAST MRI PROTECTION DIODES |
| UM9989B | 制造商:Microsemi Corporation 功能描述:RF PIN DIODE |
| UM9993 | 制造商:Microsemi Corporation 功能描述:PIN DIODE HW PN - Rail/Tube |
| UM9995 | 制造商:Microsemi Corporation 功能描述:RF PIN DIODE |
| UM9995G | 制造商:Microsemi Corporation 功能描述:RF PIN DIODE |
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