LM35DZ Precision Centigrade Temperature Sensor — TO-92, 0–100°C, 10mV/°C, Arduino

LM35DZ Precision Centigrade Temperature Sensor — TO-92, 0–100°C, 10mV/°C, Arduino

The LM35DZ is a precision analog temperature sensor from Texas Instruments in a TO-92 through-hole package. Its output voltage is linearly proportional to temperature at exactly 10mV/°C, requiring no external calibration. With a 0–100°C range, ±0.5°C accuracy, and direct connection to any microcontroller ADC, it is the standard analog temperature sensor for Arduino projects, industrial temperature monitoring, and embedded system thermal management.

Key Specifications

Parameter	Value
Package	TO-92 (through-hole)
Temperature Range	0°C – +100°C (LM35DZ)
Output Sensitivity	10mV/°C (linear)
Accuracy	±0.5°C (at +25°C)
Supply Voltage	4V – 30V
Output Impedance	0.1Ω (at 1mA load)
Quiescent Current	60μA typ.
Output	Analog voltage (0–1.0V for 0–100°C)
Calibration	Factory calibrated, no external trimming needed

LM35 Variant Comparison

Part	Range	Package	Best For
LM35DZ	0–+100°C	TO-92	Room temperature, indoor monitoring
LM35CAZ	-40–+110°C	TO-92	Extended range, outdoor use
LM35CZ	-40–+110°C	TO-92	Wide range, industrial
LM35D (TO-220)	0–+100°C	TO-220	PCB mount with heatsink tab

LM35DZ vs DS18B20 vs DHT22 — Which Sensor?

Feature	LM35DZ	DS18B20	DHT22
Output	Analog (10mV/°C)	Digital (1-Wire)	Digital (single-wire)
Accuracy	±0.5°C	±0.5°C	±0.5°C
Humidity	No	No	Yes (±2% RH)
ADC needed	Yes (MCU ADC)	No	No
Best for	Simple analog circuits, op-amp integration	Multi-sensor 1-Wire bus	Temp + humidity combined

Why Choose LM35DZ?

• 10mV/°C linear output — directly readable by any ADC without lookup tables or complex math
• No calibration needed — factory trimmed to ±0.5°C accuracy out of the box
• 4–30V supply range — works from 5V Arduino, 12V industrial supply, or 3.3V with care
• 60μA quiescent current — minimal self-heating, accurate readings without thermal management
• Analog output — integrates directly with op-amp comparators, ADCs, and analog control circuits

Compatible With

• Arduino UNO/Nano: Connect Vout to A0, read with analogRead(A0) * (5.0/1023.0) * 100 for °C
• ESP32: 3.3V supply, connect Vout to ADC pin — temp = analogRead(pin) * (3.3/4095.0) * 100
• STM32: 12-bit ADC for higher resolution temperature reading
• Op-amp thermostat: LM35DZ + LM393 comparator for analog temperature threshold switching
• Raspberry Pi: Requires external ADC (MCP3008) since Pi has no built-in ADC

Frequently Asked Questions

Q: How do I read LM35DZ temperature with Arduino?
A: Connect V+ to 5V, GND to GND, Vout to Arduino A0. Code: int raw = analogRead(A0); float voltage = raw * (5.0 / 1023.0); float tempC = voltage * 100.0; Serial.println(tempC); At 25°C, Vout = 250mV, raw ADC = ~51 (at 5V reference).

Q: Can LM35DZ measure below 0°C?
A: LM35DZ is rated 0–100°C. Below 0°C, the output goes negative, which a standard single-supply ADC cannot read. To measure below 0°C, use LM35CAZ (rated -40–+110°C) with a negative supply or a virtual ground circuit. Alternatively, use DS18B20 which handles -55°C natively.

Q: Why does my LM35DZ read higher than actual temperature?
A: Common causes: (1) Self-heating from high supply voltage — use the lowest supply voltage possible (4–5V). (2) ADC reference voltage error — use analogReference(INTERNAL) (1.1V internal reference) for better resolution at low temperatures. (3) Noise on Vout — add a 100nF ceramic capacitor from Vout to GND close to the sensor.

Package Contents

• 1× LM35DZ Precision Centigrade Temperature Sensor (TO-92)

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