Hardware Hacking

RV4145A Description
Low Power Ground Fault Interrupt Controller
RV4145A Vendor
Fairchild Semiconductor
RV4145A Categories
Ground Fault Interrupters

RV4145A Features
No potentiomenter required
Direct interface to SCR
Supply voltage derived from AC line - 26V shunt
Adjustable sensitivity
Grounded neutral fault detection
Meets U.L. 943 standards
450µA quiescent current
Ideal for 120V or 220V systems

RV4145A Description
The RV4145A is a low power controller for AC outlet ground fault interrupters. These devices detect hazardous grounding conditions, such as equipment (connected to opposite phases of the AC line) in contact with a pool of water and open circuits the line before a harmful or lethal shock occurs.
RV4145A Datasheet and Application Notes
RV4145A Datasheet

Parameter Value
Product status Full Production
Pricing* $0.386
Leads 8
Packing method RAIL
Products related to RV4145A
RV4145AM RV4145AMT RV4145AN

RV4141A Description
Low Power Ground Fault Interrupt Controller
RV4141A Vendor
Fairchild Semiconductor
RV4141A Categories
Ground Fault Interrupters

RV4141A Features
Powered from the AC line
Built-in rectifier
Direct interface to SCR
500 µA quiescent current
Precision sense amplifier
Adjustable time delay
Minimum external components
Meets UL 943 requirements
For use with 110V or 220V systems
Available in 8 pin DIP or SOIC package

RV4141A Description
The RV4141A is a low power controller for AC receptacle ground fault circuit interrupters. These devices detect hazardous current paths to ground and ground to neutral faults. The circuit interrupter then disconnects the load from the line before a harmful or lethal shock occurs.
RV4141A Datasheet and Application Notes
RV4141A Datasheet

Parameter Value
Product status Full Production
Pricing* $0.60
Leads 8
Packing method RAIL
Products related to RV4141A
RV4141AMT RV4141AM

LM1851 Description
Ground Fault Interrupter
LM1851 Vendor
National Semiconductor
LM1851 Categories
Ground Fault Interrupters

LM1851 Features
Internal power supply shunt regulator
Externally programmable fault current threshold
Externally programmable fault current integration time
Direct interface to SCR
Operates under line reversal; both load vs line and hot vs neutral
Detects neutral line faults

LM1851 Description
The LM1851 is designed to provide ground fault protection for AC power outlets in consumer and industrial environments. Ground fault currents greater than a presettable threshold value will trigger an external SCR-driven circuit breaker to interrupt the AC line and remove the fault condition. In addition to detection of conventional hot wire to ground faults, the neutral fault condition is also detected.

Full advantage of the U.S. UL943 timing specification is taken to insure maximum immunity to false triggering due to line noise. Special features include circuitry that rapidly resets the timing capacitor in the event that noise pulses introduce unwanted charging currents and a memory circuit that allows firing of even a sluggish breaker on either half-cycle of the line voltage when external full-wave rectification is used.

LM1851 Datasheet and Application Notes
LM1851 Datasheet

Parameter Value
Temperature Min (deg C) -55
Temperature Max (deg C) 125
Products related to LM1851
LM1851N LM1851MX LM1851M