LM34 Precision Fahrenheit Temperature Sensors TO-92

LM34 Precision Fahrenheit Temperature Sensor (TO-92) delivers direct Fahrenheit output for accurate temperature sensing without conversion. Designers connect it to microcontrollers, ADCs, and analog circuits to measure temperature in Fahrenheit with a linear 10 mV/°F scale.

Key Features:

• Direct Fahrenheit Output: Produces a voltage proportional to temperature in °F (10 mV per °F).
• No External Calibration: Provides accurate readings out of the box for most applications.
• Wide Supply Range: Operates from low-voltage single-supply systems for easy integration.
• Low Self-Heating: Minimizes measurement error in applications with limited airflow.
• TO-92 Through-Hole Package: Fits breadboards and through-hole PCBs for prototyping and production.

Technical Specifications:

• Output Scale: 10 mV / °F (typical).
• Supply Voltage (V_CC): Typically 4 V to 30 V; 5 V common for digital systems (verify datasheet for exact limits).
• Accuracy: Typical ±1 °F near 77 °F; refer to manufacturer datasheet for full accuracy curves.
• Operating Temperature Range: Wide ambient range suitable for commercial and industrial use (see datasheet for exact limits).
• Output Impedance: Low source impedance suitable for direct ADC or comparator input.
• Supply Current: Low quiescent current for battery-powered systems (see datasheet).

Mechanical Specifications:

• Package Type: TO-92 plastic through-hole.
• Lead Finish: Tin-plated leads suitable for conventional soldering.
• Body Material: Molded epoxy for standard sensor durability.
• Mounting: Through-hole PCB or socket mount for easy replacement and prototyping.

Dimensions:

• Typical TO-92 Body: Refer to supplier mechanical drawing for exact values; TO-92 bodies are compact and board-friendly.
• Lead Spacing and Length: Standard TO-92 lead spacing compatible with breadboards and PCB layouts.

Pinout and Wiring:

• Pin 1 (left): V_CC / Supply voltage (connect to 4–30 V as per datasheet)
• Pin 2 (middle): V_OUT / Sensor output (10 mV per °F). Measure this pin with ADC or voltmeter.
• Pin 3 (right): GND / Ground reference
• Wiring Note: Connect V_CC to supply, tie GND to system ground, and read V_OUT. Add a small bypass capacitor between V_CC and GND if your supply is noisy.

Datasheet Reference:

• LM34 datasheet

Applications:

• HVAC and Environmental Control: Monitor and regulate temperature in Fahrenheit for climate systems.
• Thermostats and Oven Sensors: Use direct Fahrenheit output for consumer appliances.
• Data Acquisition: Feed directly into ADC channels for logging and control systems.
• Battery and Industrial Monitoring: Track ambient or component temperatures in industrial settings.
• Educational and Prototyping: Ideal for learning circuits and quick experiments on breadboards.

Equivalent Models:

• LM34A / LM34C: Variants with different accuracy and temperature ranges; check manufacturer naming.
• TMP36 (analogue Celsius sensor): Use TMP36 with conversion if you need direct Celsius output instead of Fahrenheit.
• Other Precision Thermistors / IC Sensors: Select parts with similar linearity and output characteristics when LM34 is unavailable. Validate scaling before replacement.

Package Includes:

• 1 x LM34 Precision Fahrenheit Temperature Sensor (TO-92)