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

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Datasheet

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

Featured Application Notes

Title		Size	Date	Other Language
	AN-79: Application Note 79 IC Preamplifier Challenges Choppers on Drift	380 Kbytes	1-Oct-02
	AN-480: A 40 MHz Programmable Video Op Amp	181 Kbytes	4-Nov-95
	AN-210: Application Note 210 New Phase-Locked-Loops Have Advantages as Frequency to Voltage Converters (and more)	339 Kbytes	3-Oct-02
	AN-71: Application Note 71 Micropower Circuits Using the LM4250 Programmable Op Amp	312 Kbytes	2-Oct-02
	AN-127: Application Note 127 LM143 Monolithic High Voltage Operational Amplifier Applications	441 Kbytes	2-May-04

More Application Notes

Title		Size	Date	Other Language
	AN-79: Application Note 79 IC Preamplifier Challenges Choppers on Drift	380 Kbytes	1-Oct-02
	AN-210: Application Note 210 New Phase-Locked-Loops Have Advantages as Frequency to Voltage Converters (and more)	339 Kbytes	3-Oct-02
	AN-71: Application Note 71 Micropower Circuits Using the LM4250 Programmable Op Amp	312 Kbytes	2-Oct-02
	AN-127: Application Note 127 LM143 Monolithic High Voltage Operational Amplifier Applications	441 Kbytes	2-May-04
	AN-1256: Application Note 1256 Tiny Temperature Sensors for Portable Systems	66 Kbytes	1-Oct-02
	AN-480: A 40 MHz Programmable Video Op Amp	181 Kbytes	4-Nov-95

Obsolete Versions

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

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM74A-3 MDA	CS065	2	38968	52	0	4402000	1	1249079519
LM74A-5 MDA	CS065	2	38968	52	0	4402000	1	1249079519

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.

Obsolete Versions

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