Features Low 1.5V operation Push-pull output with 50µA source current capability Two selectable gains Very accurate over wide temperature range of −50°C to +150°C Low quiescent current Output is short-circuit protected Extremely small microSMD package Footprint compatible with the industry-standard LM20 temperature sensor Description The LM94023 is a precision analog output CMOS integrated-circuit temperature sensor that operates at a supply voltage as low as 1.5 Volts. Available in the very small four-bump microSMD 0.8mm x 0.8mm) the LM94023 occupies very little board area. A class-AB output structure gives the LM94023 strong output source and sink current capability for driving heavy loads, making it well suited to source the input of a sample-and-hold analog-to-digital converter with its transient load requirements, This generally means the LM94023 can be used without external components, like resistors and buffers, on the output. While operating over the wide temperature range of −50°C to +150°C, the LM94023 delivers an output voltage that is inversely porportional to measured temperature. The LM94023's low supply current makes it ideal for battery-powered systems as well as general temperature sensing applications. A Gain Select (GS) pin sets the gain of the temperature-to-voltage output transfer function. Either of two slopes are selectable: −5.5 mV/°C (GS=0) or −8.2 mV/°C (GS=1). In the lowest gain configuration, the LM94023 can operate with a 1.5V supply while measuring temperature over the full −50°C to +150°C operating range. Tying GS high causes the transfer function to have the largest gain for maximum temperature sensitivity. The gain-select inputs can be tied directly to VDD or Ground without any pull-up or pull-down resistors, reducing component count and board area. These inputs can also be driven by logic signals allowing the system to optimize the gain during operation or system diagnostics. Key Specification ■  Supply Voltage 1.5V to 5.5V ■ Supply Current 5.4 μA (typ) ■ Output Drive   ±50 μA ■  Temperature Accuracy 20°C to 40°C -50°C to 70°C -50°C to 90°C -50°C to 150°C ±1.5°C ±1.8°C ±2.1°C ±2.7°C ■  Operating Temperature   −50°C to 150°C Applications Cell phones Wireless Transceivers Battery Management Automotive Disk Drives Games Appliances

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

Parameters Values Temperature Accuracy (+/-) 1.5 deg C Supply Min 1.5 Volt Quiescent Current_ 8.1 uA Temperature Min -50 deg C Temperature Max 150 deg C Sensor Gain -5.5 or -8.2 mV/degC Supply Max 5.5 Volt Single Supply Yes Output Impedance 4.4 Ohm Quiescent Current 0.0081 mA Automotive Yes PowerWise Yes

Datasheets

Title		Size	Date	Other Language
	LM94023 1.5V, micro SMD, Dual-Gain Analog Temperature Sensor with Class AB Output	389 Kbytes	10-Sep-08

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM94023BITME/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1000 AVNET-EM Worldwide 250 DIGI-KEY Worldwide 1679 FARNELL Europe and Asia 20 MOUSER Worldwide 225 NEWARK Americas 75 TAYLOR Americas 1000	$0.35 each at 1K+ pcs	reel of 250
LM94023BITMX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.35 each at 1K+ pcs	reel of 3000

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 LM94023.

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 LM94023 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM94023EB/NOPB	LM94023EB Board	Preliminary Lead Free (RoHS)	Contact your distributor	CALL	N/A

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM94023BITME/NOPB	.892	MICRO SMD	4	1	260	Detail	N/A	N/A	X I
LM94023BITMX/NOPB	.892	MICRO SMD	4	1	260	Detail	N/A	N/A	X I

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 LM94023.

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 LM94023 is located at RoHS Status.

Design Tools

Title	Size	Date
LM94023 Design Aid (xls)

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)
LM94023BITME	CMOS7	0	21301	0	0	1584000	3	449464325
LM94023BITMX	CMOS7	0	21301	0	0	1584000	3	449464325

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 LM94023.

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 LM94023 is located at RoHS Status.