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 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.

Datasheets

Title		Size	Date	Other Language
	LM1851 Ground Fault Interrupter	165 Kbytes	7-Jan-96

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM1851M/NOPB LM1851M RoHS Status	SOIC NARROW	Full production Lead Time: 12 weeks	Distributor Region Qty AVNET-EM Worldwide 950 DIGI-KEY Worldwide 0 MOUSER Worldwide 950	$0.41 each at 1K+ pcs	rail of 95
LM1851MX/NOPB LM1851MX RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.41 each at 1K+ pcs	reel of 2500
LM1851N/NOPB LM1851N RoHS Status	MDIP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1398	$0.44 each at 1K+ pcs	rail of 40

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM1851.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM1851 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM1851M/NOPB LM1851M	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	N/A	N/A	NSZXTT LM 1851M
LM1851MX/NOPB LM1851MX	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	N/A	N/A	NSZXTT LM 1851M
LM1851N/NOPB LM1851N	508.252 510.002	MDIP	8	1 1	NA NA	Detail	N/A	N/A	NSUZXYTTE# LM 1851N

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM1851.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM1851 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM1851M	SLM	0	44046	0	0	3532500	1	1002356520
LM1851MX	SLM	0	44046	0	0	3532500	1	1002356520
LM1851N	SLM	0	44046	0	0	3532500	1	1002356520

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM1851.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM1851 is located at RoHS Status.