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MC3423
Overvoltage Crowbar
Sensing Circuit
This overvoltage protection circuit (OVP) protects sensitive
electronic circuitry from overvoltage transients or regulator failures
when used in conjunction with an external “crowbar” SCR. The
device senses the overvoltage condition and quickly “crowbars” or
short circuits the supply, forcing the supply into current limiting or
opening the fuse or circuit breaker.
The protection voltage threshold is adjustable and the MC3423 can
be programmed for minimum duration of overvoltage condition
http://onsemi.com
MARKING
DIAGRAMS
before tripping, thus supplying noise immunity.
The MC3423 is essentially a “two terminal” system, therefore it
can be used with either positive or negative supplies.
8
1
PDIP?8
P1 SUFFIX
PLASTIC PACKAGE
CASE 626
MC3423P1
AWL
YYWW
Features
? Pb?Free Package is Available
MC3423P1 = Device Code
A = Assembly Location
WL = Wafer Lot
MAXIMUM RATINGS
YY = Year
Rating
Differential Power Supply Voltage
Symbol
V CC ?V EE
Value
40
Unit
Vdc
WW = Work Week
Sense Voltage (1)
Sense Voltage (2)
Remote Activation Input Voltage
Output Current
V Sense1
V Sense2
V act
I O
6.5
6.5
7.0
300
Vdc
Vdc
Vdc
mA
8
1
SOIC?8
D SUFFIX
PLASTIC PACKAGE
CASE 751
8
1
3423
ALYW
Operating Ambient Temperature Range
T A
0 to +70
° C
Operating Junction Temperature
Storage Temperature Range
T J
T stg
125
?65 to +150
° C
° C
3423
A
L
= Device Code
= Assembly Location
= Wafer Lot
Maximum ratings are those values beyond which device damage can occur.
Maximum ratings applied to the device are individual stress limit values (not
Y
W
= Year
= Work Week
normal operating conditions) and are not valid simultaneously. If these limits
are exceeded, device functional operation is not implied, damage may occur
and reliability may be affected.
PIN CONNECTIONS
V in
V out
V CC 1
8
Drive
Output
Source
Current
Limited
DC
Power
Supply
C out
+
O. V. P.
MC3423
Sense 1 2
Sense 2 3
Current
4
7
6
5
V EE
Indicator
Output
Remote
Activation
Figure 1. Simplified Application
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
? Semiconductor Components Industries, LLC, 2005
March, 2005 ? Rev. 5
1
Publication Order Number:
MC3423/D
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MC3423P1G 功能描述:监控电路 6.5V OverVoltage Crowbar Sensing RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
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