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RS1117A-33SJG Datasheet(PDF) 7 Page - Orister Corporation

Part # RS1117A-33SJG
Description  1.0A Low Dropout Positive Voltage Regulator
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Manufacturer  ORISTER [Orister Corporation]
Direct Link  http://www.orister.com
Logo ORISTER - Orister Corporation

RS1117A-33SJG Datasheet(HTML) 7 Page - Orister Corporation

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DS‐RS1117A‐16    September, 2009 
www.Orister.com
Junction‐to‐case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. The 
bonding wires are appending paths. The former is the lowest resistance path. Proper mounting is required to ensure the 
best possible thermal flow this area of the package to the heat sink. Thermal compound at the case‐to‐heat‐sink interface 
is strongly recommended. The case of all devices in this series is electrically connected to the output. Therefore, if the case 
of  the  device  must  be  electrically  isolated,  a  thermally  conductive  spacer  can  be  used,  as  long  its  thermal  resistance  is 
considered. 
 
Protection Diode 
In general operation, RS1117A series don’t need any protection diodes. From the cross‐section structure of RS1117A series, 
the output pin is connected to P+ substrate, and the input pin is connected to N‐ well. There is a parasitic reverse diode 
between  them.  It  can  handle  microsecond  surge  currents  of  5A  to  10A.  Even  with  large  output  capacitance,  it  is  very 
difficult to get those values of surge currents in normal operation. Only with high value output capacitors, such as 1000uF. 
And with the input pin instantaneously shorted to ground, can damage occur. A crowbar circuit at the input of the RS1117A 
series  can  generate  those  kinds  of  currents,  and  a  diode  from  output  to  input  is  recommended.  Normal  power  supply 
cycling or even plugging and unplugging in the system will not generate currents large enough to do any damage. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Output Voltage
Package
Output Voltage
Package
Voltage
Output Voltage
 
RS1117ASJ-A
ADJ
RS1117AJ-A
ADJ
RS1117ASJ-B
1.8V
RS1117AJ-B
1.8V
RS1117ASJ-C
2.5V
RS1117AJ-C
2.5V
RS1117ASJ-D
3.3V
RS1117AJ-D
3.3V
RS1117ASJ-E
5.0V
SOT-223
RS1117AJ-E
5.0V
TO-252
RS1117A -A
ADJ
RS1117A -B
1.8V
RS1117A -C
2.5V
RS1117A -D
3.3V
RS1117A -E
5.0V
RS1117AE-A
ADJ
RS1117AE-B
1.8V
RS1117AE-C
2.5V
RS1117AE-D
3.3V
RS1117AE-E
5.0V


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