Features 0.0625°C temperature resolution. Shutdown mode conserves power between temperature reading SPI and MICROWIRE Bus interface LM74 is also available in a 5-Bump micro SMD and 8-pin MSOP Description The LM74A is a temperature sensor, Delta-Sigma analog-to-digital converter with an SPI and MICROWIRE compatible interface in die form. The host can query the LM74A at any time to read temperature. A shutdown mode decreases power consumption to less than 10 µA. This mode is useful in systems where low average power consumption is critical. This particular data sheet applies to the LM74 in die form. The LM74 is available in the SO-8 package as well as an 5-Bump micro SMD package please refer to LM74 data sheet for detailed specifictions pertaining to the packaged parts. The LM74A has 12-bit plus sign temperature resolution (0.0625°C per LSB) while operating over a temperature range of -40°C to +150°C. The LM74A-5 MDA accuracy of ±3.5°C is specified over a temperature range of 0°C to +150°C. The LM74A's 4.5V to 5.5V or 3.0V to 3.6V supply voltage range, low supply current and simple SPI interface make it ideal for a wide range of applications. These include thermal management and protection applications in hard disk drives, printers, electronic test equipment, and office electronics. Key Specification Supply Voltage LM74A-5 4.5V to 5.5V   LM74A-3 3.0V to 3.6V Supply Current operating 310µA (typ)     520µA (max)   shutdown 8µA (typ) LM74A-5 MDA Temperature Accuracy 0°C to 140°C ±3.0°C(max)   140°C to 150°C ±3.5°C(max) Applications System Thermal Management Personal Computers Disk Drives Office Electronics Electronic Test Equipment

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

Datasheets

Title		Size	Date	Other Language
	LM74A SPI/MICROWIRE™ 12-Bit Plus Sign Temperature Sensor (LM74 in Die Form)	605 Kbytes	12-Nov-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM74A-5 MDA RoHS Status		Full production Lead Time: N/A	Contact your distributor	CALL	tray of N/A

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM74A-3 MDA	NONE	NATIONAL SEMICONDUCTOR	03 Dec 2008

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 LM74A.

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 LM74A is located at RoHS Status.

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 LM74A.

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 LM74A 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)
LM74A-5 MDA	CS065	2	47473	43	0	5527000	1	1568301341

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 LM74A.

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 LM74A is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM74A-3 MDA	NONE	NATIONAL SEMICONDUCTOR	03 Dec 2008