Features • Accurately senses die temperature of remote ICs or diode junctions • Offset register allows sensing a variety of thermal diodes accurately • On-board local temperature sensing • 10 bit plus sign remote diode temperature data format, 0.125 °C resolution • T_CRIT_A# output useful for system shutdown • ALERT# output supports SMBus 2.0 protocol • SMBus 2.0 compatible interface, supports TIMEOUT • 8-pin MSOP and SOIC packages Description The LM86 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM86 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode connected transistor such as the 2N3904. The temperature of any ASIC can be accurately determined using the LM86 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM86 remote sensor accuracy of ±0.75°C is factory trimmed for the 1.008 typical non-ideality factor of the mobile Pentium™ III thermal diode. The LM86 has an Offset register to allow measuring other diodes without requiring continuous software management. Contact hardware.monitor.team@nsc.com to obtain the latest data for new processors. Activation of the ALERT# output occurs when any temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the T_CRIT temperature limit. Activation of the T_CRIT_A# occurs when any temperature exceeds the T_CRIT programmed limit. The LM86 is pin and register compatible with the the Analog Devices ADM1032 and Maxim MAX6657/8. Key Specification Supply Voltage 3.0V to 3.6V Supply Current 0.8mA (typ) Local Temp Accuracy (includes quantization error) TA=25°C to 125°C ±3.0°C (max) Remote Diode Temp Accuracy (includes quantization error) TA=30°C, TD=80°C ±0.75°C (max) TA=30°C to 50°C, TD=60°C to 100°C ±1.0°C (max) TA=0°C to 85°C, TD=25°C to 125°C ±3.0°C (max) Applications • Computer System Thermal Management (e.g. Laptop, Desktop, Workstations, Server) • Electronic Test Equipment • Office Electronics

Also Recommended LM95231▲ Better Temperature Resolution MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM86 ±0.75°C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface	414 Kbytes	30-Apr-03	日本語

More Application Notes

Title		Size	Date	Other Language
	AN-1155: Application Note 1155 A Simple Software I2C Routine for the COP8	82 Kbytes	15-May-04
	AN-1260: Application Note 1260 Autonomous Fan Control for Processor Systems Using the LM85	74 Kbytes	10-Mar-04
	AN-1262: Application Note 1262 Four-Speed Fan Control Using Simple Remote Diode Temperature Sensor	70 Kbytes	1-Oct-02

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM86CIM/NOPB LM86CIM RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 215 DIGIKEY Worldwide 0 RS COMPONENTS Worldwide 105 TECHMOSA Asia Pacific 156	$0.71 each at 1K+ pcs	rail of 95
LM86CIMM/NOPB LM86CIMM RoHS Status	MINI SOIC	Full production Lead Time: 12 weeks	Distributor Region Qty ARROW Worldwide 6925 DIGIKEY Worldwide 1895 FUTURE Worldwide 1100 NEWARK Americas 548	$0.71 each at 1K+ pcs	reel of 1000
LM86CIMMX/NOPB LM86CIMMX RoHS Status	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty AITG Asia Pacific 1001 DIGIKEY Worldwide 0 FUTURE Worldwide 1100	$0.71 each at 1K+ pcs	reel of 3500
LM86CIMX/NOPB LM86CIMX RoHS Status	SOIC NARROW	Full production Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$0.71 each at 1K+ pcs	reel of 2500

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

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM86CIM/NOPB LM86CIM		SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT LM86 CIM
LM86CIMM/NOPB LM86CIMM		MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT T10C
LM86CIMMX/NOPB LM86CIMMX		MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT T10C
LM86CIMX/NOPB LM86CIMX		SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT LM86 CIM

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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

Design Tools

Title	Size	Date
SensorEval Software for Thermal Mangement Products

CAD Symbols and Models Download LM86 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM86CIM	CMOS7	0	18406	0	0	1089000	4	309006723
LM86CIMM	CMOS7	0	18406	0	0	1089000	4	309006723
LM86CIMMX	CMOS7	0	18406	0	0	1089000	4	309006723
LM86CIMX	CMOS7	0	18406	0	0	1089000	4	309006723

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.

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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