The LM34 series devices are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Fahrenheit temperature. The LM34 device has an advantage over linear temperature sensors calibrated in degrees Kelvin, because the user is not required to subtract a large constant voltage from its output to obtain convenient Fahrenheit scaling. The LM34 device does not require any external calibration or trimming to provide typical accuracies of ±1/2°F at room temperature and ±1-1⁄2°F over a full −50°F to 300°F temperature range. Lower cost is assured by trimming and calibration at the wafer level. The low output impedance, linear output, and precise inherent calibration of the LM34 device makes interfacing to readout or control circuitry especially easy. It can be used with single power supplies or with plus and minus supplies. Because the LM34 device draws only 75 µA from its supply, the device has very low self-heating, less than 0.2°F in still air.
The LM34 device is rated to operate over a −50°F to 300°F temperature range, while the LM34C is rated for a −40°F to 230°F range (0°F with improved accuracy). The LM34 devices are series is available packaged in hermetic TO-46 transistor packages; while the LM34C, LM34CA, and LM34D are available in the plastic TO-92 transistor package. The LM34D device is available in an 8-lead, surface-mount, small-outline package. The LM34 device is a complement to the LM35 device (Centigrade) temperature sensor.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM34 | SOIC (8) | 4.90 mm × 3.91 mm |
TO-92 (3) | 4.30 mm × 4.30 mm | |
TO-46 (3) | 4.699 mm × 4.699 mm |
Changes from C Revision (January 2015) to D Revision
Changes from B Revision (November 2000) to C Revision
PIN | TYPE | DESCRIPTION | |||
---|---|---|---|---|---|
NAME | TO46/NDV | TO92/LP | SO8/D | ||
+VS | — | — | 8 | POWER | Positive power supply pin |
VOUT | — | — | 1 | O | Temperature Sensor Analog Output |
GND | — | — | 4 | GND | Device ground pin, connect to power supply negative terminal |
N.C. | — | — | 2 | — | No Connection |
3 | |||||
5 | |||||
6 | |||||
7 |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Supply voltage | 35 | –0.2 | V | |
Output voltage | 6 | –1 | V | |
Output current | 10 | mA | ||
Storage temperature, Tstg | TO-46 Package | −76 | 356 | °F |
TO-92 Package | −76 | 300 | ||
SO-8 Package | −65 | 150 |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2500 | V |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Specified operating temperature range (TMIN ≤ TA ≤ TMAX) |
LM34, LM34A | –50 | 300 | °F |
LM34C, LM34CA | –40 | 230 | ||
LM34D | 32 | 212 | ||
Supply Voltage Range (+VS) | 4 | 30 | V |
THERMAL METRIC(1) | LM34 | UNIT | |||
---|---|---|---|---|---|
NDV (TO-46) | LP (TO-92) | D (SO8) | |||
3 PINS | 3 PINS | 8 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 720 | 324 | 400 | °F/W |
RθJC | Junction-to-case thermal resistance | 43 | — | — |
PARAMETER | TEST CONDITIONS | LM34A | LM34CA | UNIT | ||||||
---|---|---|---|---|---|---|---|---|---|---|
MIN | TYP | MAX | MIN | TYP | MAX | |||||
Accuracy(3) | TA = 77°F | Tested Limit(1) | –1 | 1 | –1 | 1 | °F | |||
Design Limit(2) | ||||||||||
±0.4 | ±0.4 | |||||||||
T A = 0°F | Tested Limit | °F | ||||||||
Design Limit | –2 | 2 | ||||||||
±0.6 | ±0.6 | |||||||||
TA = TMAX | Tested Limit | –2 | 2 | –2 | 2 | °F | ||||
Design Limit | ||||||||||
±0.8 | ±0.8 | |||||||||
TA = TMIN | Tested Limit | –2 | 2 | °F | ||||||
Design Limit | –3 | 3 | ||||||||
±0.8 | ±0.8 | |||||||||
Nonlinearity (4) | Tested Limit | °F | ||||||||
Design Limit | –0.7 | 0.7 | –0.6 | 0.6 | ||||||
TA = 77°F | ±0.35 | ±0.3 | ||||||||
Sensor gain (Average Slope) | Tested Limit | 9.9 | 10.1 | mV/°F | ||||||
Design Limit | +9.9 | 10.1 | ||||||||
TA = 77°F | +10 | 10 | ||||||||
Load regulation(5) | TA = 77°F 0 ≤ IL ≤ 1 mA |
Tested Limit | –1 | 1 | –1 | 1 | mV/mA | |||
Design Limit | ||||||||||
±0.4 | ±0.4 | |||||||||
0 ≤ IL ≤ 1 mA | Tested Limit | mV/mA | ||||||||
Design Limit | –3 | 3 | –3 | 3 | ||||||
±0.5 | ±0.5 | |||||||||
Line regulation(5) | TA = 77°F 5 V ≤ VS ≤ 30 V |
Tested Limit | –0.05 | 0.05 | –0.05 | 0.05 | mV/V | |||
Design Limit | ||||||||||
±0.01 | ±0.01 | |||||||||
5 V ≤ VS ≤ 30 V | Tested Limit | mV/V | ||||||||
Design Limit | –0.1 | 0.1 | –0.1 | 0.1 | ||||||
±0.02 | ±0.02 | |||||||||
Quiescent current(6) | VS = 5 V, TA = 77°F | Tested Limit | 90 | 90 | µA | |||||
Design Limit | ||||||||||
75 | 75 | |||||||||
VS = 5 V | Tested Limit | µA | ||||||||
Design Limit | 160 | 139 | ||||||||
131 | 116 | |||||||||
VS = 30 V, TA = 77°F | Tested Limit | 92 | 92 | µA | ||||||
Design Limit | ||||||||||
76 | 76 | |||||||||
VS = 30 V | Tested Limit | µA | ||||||||
Design Limit | 163 | 142 | ||||||||
132 | 117 | |||||||||
Change of quiescent current(5) | 4 V ≤ VS ≤ 30 V, TA = 77°F | Tested Limit | 2 | 2 | µA | |||||
Design Limit | ||||||||||
0.5 | 0.5 | |||||||||
5 V ≤ VS ≤ 30 V | Tested Limit | µA | ||||||||
Design Limit | 3 | 3 | ||||||||
1 | 1 | |||||||||
Temperature coefficient of quiescent current | Tested Limit | µA/°F | ||||||||
Design Limit | 0.5 | 0.5 | ||||||||
0.3 | 0.3 | |||||||||
Minimum temperature for rated accuracy | In circuit of Basic Fahrenheit Temperature Sensor (5°F to 300°F), IL = 0 TA = 77°F |
Tested Limit | °F | |||||||
Design Limit | 5 | 5 | ||||||||
3 | 3 | |||||||||
Long-term stability | TJ = TMAX for 1000 hours | ±0.16 | ±0.16 | °F |
PARAMETER | CONDITIONS | LM34 | LM34C, LM34D | UNIT | ||||||
---|---|---|---|---|---|---|---|---|---|---|
MIN | TYP | MAX | MIN | TYP | MAX | |||||
Accuracy, LM34, LM34C(3) | TA = 77°F | Tested Limit(1) | –2 | 2 | –2 | 2 | °F | |||
Design Limit(2) | ||||||||||
±0.8 | ±0.8 | |||||||||
TA = 0°F | Tested Limit | °F | ||||||||
Design Limit | –3 | 3 | ||||||||
±1 | ±1 | |||||||||
TA = TMAX | Tested Limit | –3 | 3 | °F | ||||||
Design Limit | –3 | 3 | ||||||||
±1.6 | ±1.6 | |||||||||
TA = TMIN | Tested Limit | °F | ||||||||
Design Limit | –3 | 3 | –4 | 4 | ||||||
±1.6 | ±1.6 | |||||||||
Accuracy, LM34D(3) | TA = 77°F | Tested Limit | –3 | 3 | °F | |||||
Design Limit | ||||||||||
±1.2 | ||||||||||
TA = TMAX | Tested Limit | °F | ||||||||
Design Limit | –4 | 4 | ||||||||
±1.8 | ||||||||||
TA = TMIN | Tested Limit | °F | ||||||||
Design Limit | –4 | 4 | ||||||||
±1.8 | ||||||||||
Nonlinearity (4) | Tested Limit | °F | ||||||||
Design Limit | –1.0 | 1 | –1 | 1 | ||||||
±0.6 | ±0.4 | |||||||||
Sensor gain (Average Slope) | Tested Limit | 9.8 | 10.2 | mV/°F | ||||||
Design Limit | 9.8 | 10.2 | ||||||||
10 | 10 | |||||||||
Load regulation(5) | TA = 77°F 0 ≤ IL ≤ 1 mA |
Tested Limit | –2.5 | 2.5 | –2.5 | 2.5 | mV/mA | |||
Design Limit | ||||||||||
±0.4 | ±0.4 | |||||||||
TMIN ≤ TA ≤ 150°F 0 ≤ IL ≤ 1 mA |
Tested Limit | mV/mA | ||||||||
Design Limit | –6.0 | 6 | –6 | 6 | ||||||
±0.5 | ±0.5 | |||||||||
Line regulation(5) | TA = 77°F, 5 V ≤ VS ≤ 30 V |
Tested Limit | –0.1 | 0.1 | –0.1 | 0.1 | mV/V | |||
Design Limit | ||||||||||
±0.01 | ±0.01 | |||||||||
5 V ≤ VS ≤ 30 V | Tested Limit | mV/V | ||||||||
Design Limit | –0.2 | 0.2 | –0.2 | 0.2 | ||||||
±0.02 | ±0.02 | |||||||||
Quiescent current(6) | VS = 5 V, TA = 77°F | Tested Limit | 100 | 100 | µA | |||||
Design Limit | ||||||||||
75 | 75 | |||||||||
VS = 5 V | Tested Limit | µA | ||||||||
Design Limit | 176 | 154 | ||||||||
131 | 116 | |||||||||
VS = 30 V, TA = 77°F | Tested Limit | 103 | 103 | µA | ||||||
Design Limit | ||||||||||
76 | 76 | |||||||||
VS = 30 V | Tested Limit | µA | ||||||||
Design Limit | 181 | 159 | ||||||||
132 | 117 | |||||||||
Change of quiescent current(5) | 4 V ≤ VS ≤ 30 V, TA = +77°F |
Tested Limit | 3 | 3 | µA | |||||
Design Limit | ||||||||||
0.5 | 0.5 | |||||||||
5 V ≤ VS ≤ 30 V | Tested Limit | µA | ||||||||
Design Limit | 5 | 5 | ||||||||
1 | 1 | |||||||||
Temperature coefficient of quiescent current | Tested Limit | µA/°F | ||||||||
Design Limit | 0.7 | 0.7 | ||||||||
0.3 | 0.3 | |||||||||
Minimum temperature for rated accuracy | In circuit of Basic Fahrenheit Temperature Sensor (5°F to 300°F), IL = 0 | Tested Limit | °F | |||||||
Design Limit | 5.0 | 5 | ||||||||
3 | 3 | |||||||||
Long-term stability | TJ = TMAX for 1000 hours | ±0.16 | ±0.16 | °F |