Features • Calibrated directly in degrees Fahrenheit • Linear +10.0 mV/°F scale factor • 1.0°F accuracy guaranteed (at +77°F) • Rated for full -50° to +300°F range • Suitable for remote applications • Low cost due to wafer-level trimming • Operates from 5 to 30 volts • Less than 90 µA current drain • Low self-heating, 0.18°F in still air • Nonlinearity only ±0.5°F typical • Low-impedance output, 0.4Ohm for 1 mA load Description The LM34 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Fahrenheit temperature. The LM34 thus has an advantage over linear temperature sensors calibrated in degrees Kelvin, as the user is not required to subtract a large constant voltage from its output to obtain convenient Fahrenheit scaling. The LM34 does not require any external calibration or trimming to provide typical accuracies of ±½°F at room temperature and ±1½°F over a full -50 to +300°F temperature range. Low cost is assured by trimming and calibration at the wafer level. The LM34's low output impedance, linear output, and precise inherent calibration make interfacing to readout or control circuitry especially easy. It can be used with single power supplies or with plus and minus supplies. As it draws only 75 µA from its supply, it has very low self-heating, less than 0.2°F in still air. The LM34 is rated to operate over a -50° to +300°F temperature range, while the LM34C is rated for a -40° to +230°F range (0°F with improved accuracy). The LM34 series is available packaged in hermetic TO-46 transistor packages, while the LM34C, LM34CA and LM34D are also available in the plastic TO-92 transistor package. The LM34D is also available in an 8-lead surface mount small outline package. The LM34 is a complement to the LM35 (Centigrade) temperature sensor.

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Typical Application *click for larger image
Typical Performance *click for larger image

Datasheet

Title		Size	Date	Other Language
	LM34 Precision Fahrenheit Temperature Sensors	251 Kbytes	30-Nov-00	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-460: Application Note 460 LM34/LM35 Precision Monolithic Temperature Sensors	306 Kbytes	20-Sep-02	日本語

More Application Notes

Title		Size	Date	Other Language
	AN-1982: Application Note 1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool	63 Kbytes	15-Jul-09
	AN-1852: Application Note 1852 Designing With pH Electrodes	190 Kbytes	25-Sep-08

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM34DM/NOPB LM34DM RoHS	SOIC NARROW	Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 22 AVNET-EM Worldwide 361 DIGIKEY Worldwide 1679 FUTURE Worldwide 1100 NEWARK Americas 230	$0.92 each at 1K+ pcs	rail of 95
LM34DMX/NOPB LM34DMX RoHS	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 2500 DIGIKEY Worldwide 0 FUTURE Worldwide 285	$0.92 each at 1K+ pcs	reel of 2500
LM34CAZ/NOPB LM34CAZ RoHS		Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 1025 AVNET-EM Worldwide 931 DIGIKEY Worldwide 2531 FARNELL Europe and Asia 272 FUTURE Worldwide 1100 NEWARK Americas 1153	$4.00 each at 1K+ pcs	box of 1800
LM34CZ/NOPB LM34CZ RoHS		Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 549 AVNET-EM Worldwide 1773 DIGIKEY Worldwide 1006 FARNELL Europe and Asia 279 FUTURE Worldwide 1100 NEWARK Americas 2024 TAYLOR Americas 1390	$3.10 each at 1K+ pcs	box of 1800
LM34DZ/NOPB LM34DZ RoHS		Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 2025 AVNET-EM Worldwide 1642 DIGIKEY Worldwide 7118 FUTURE Worldwide 1100 NEWARK Americas 820	$0.95 each at 1K+ pcs	box of 1800
LM34AH/NOPB LM34AH RoHS		Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 576 AVNET-EM Worldwide 106 DIGIKEY Worldwide 261	$9.90 each at 1K+ pcs	box of 1000
LM34CAH/NOPB LM34CAH RoHS		Full production Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 444 FUTURE Worldwide 1100	$8.25 each at 1K+ pcs	box of 1000
LM34DH/NOPB LM34DH RoHS		Full production Lead Time: 8 weeks	Distributor Region Qty AVNET-EM Worldwide 83 DIGIKEY Worldwide 0	$5.17 each at 1K+ pcs	box of 1000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM34CH	LM34CAH	NATIONAL SEMICONDUCTOR	01 Dec 2009

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM34CAZ	SLM	0	44046	0	0	3532500	1	1002356520
LM34CZ	SLM	0	44046	0	0	3532500	1	1002356520
LM34DM	SLM	0	44046	0	0	3532500	1	1002356520
LM34DMX	SLM	0	44046	0	0	3532500	1	1002356520
LM34DZ	SLM	0	44046	0	0	3532500	1	1002356520

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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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM34CH	LM34CAH	NATIONAL SEMICONDUCTOR	01 Dec 2009