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

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

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	Standard Pack Size
LM94023BITME/NOPB RoHS Status		Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1000 DIGIKEY Worldwide 1275 FUTURE Worldwide 500 NEWARK Americas 303	$0.35 each at 1K+ pcs	reel of 250
LM94023BITMX/NOPB RoHS Status		Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY 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/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.

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.

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Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM94023BITME	CMOS7	0	18406	0	0	1089000	4	309006723
LM94023BITMX	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.