> For the complete documentation index, see [llms.txt](https://docs.acrome.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.acrome.net/smd-applications/boardoza-sensors/th09c-temp-sensor-breakout-board.md).

# TH09C Temp Sensor Breakout Board

### Overview

The Boardoza TH09C is a precision temperature sensing module designed for applications demanding high accuracy and rapid thermal response. At its core lies a sensitive thermistor-based architecture, engineered to provide reliable temperature measurements across a broad environmental range.

Optimized for integration into embedded systems, this breakout board simplifies the analog interface by providing a standard 3-pin connection. It is suitable for both 3.3V and 5V logic environments, making it a versatile choice for HVAC monitoring, industrial process control, and consumer electronics thermal management.

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<div align="left"><figure><img src="/files/XoG89FW9wfCENKeqBEIv" alt="" width="375"><figcaption></figcaption></figure></div>

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### Core Technical Specifications

The module is defined by the following operational parameters:

* Sensing Element: High-precision NTC (Negative Temperature Coefficient) thermistor, typically 10kΩ at 25°C, where resistance decreases as temperature increases.
* Temperature Range: Capable of measuring temperatures from -40°C to +125°C, covering most industrial and consumer application requirements.
* Accuracy: Provides a measurement tolerance of ±1%, ensuring consistent data fidelity for critical thermal loops.
* B-Constant: Characterized by a Beta value (B25/50) of 3950K, defining the slope of the resistance-temperature curve for software linearization.
* Output Type: Analog voltage output proportional to the temperature, designed for direct connection to an MCU ADC pin.
* Operating Voltage: Supports a flexible supply input of 3.3V to 5V DC.
* Physical Dimensions: A compact 20 mm x 40 mm PCB footprint.

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### Key Engineering Features

#### Linearized Analog Output

While raw thermistors exhibit a non-linear resistance response, this breakout board is typically configured as a voltage divider circuit. This setup produces an analog voltage output that can be easily mapped to temperature values using the Steinhart-Hart equation or simplified Beta parameter calculations in the host microcontroller firmware.

#### Wide Operational Envelope

The sensor's wide operating temperature range (-40°C to +125°C) allows it to be deployed in harsh environments, from freezing outdoor weather stations to the high-heat interiors of power supply enclosures. Its ±1% accuracy ensures that it meets the rigorous standards required for safety-critical thermal shutdowns.

#### Simplified Interface

The module is designed for "plug-and-measure" simplicity. By handling the mechanical mounting and electrical termination of the discrete thermistor component, it provides a robust, vibration-resistant platform that eliminates the need for point-to-point wiring or custom signal conditioning on the main PCB.

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### Hardware Interface and Signal Mapping

The module interfaces via a standard 3-pin header, labeled for quick identification:

Power and Signal

* VCC (Signal Pin): This pin serves as the signal output. In a typical voltage divider configuration on the breakout, the output voltage at this pin varies with temperature. It is connected to the ADC input of the microcontroller.
* GND: Common system ground.
* (Third Pin): Depending on the specific voltage divider topology used on the board, the third pin (often labeled VCC or similar) provides the bias voltage (3.3V or 5V) to the thermistor circuit.

*(Note: Ensure to verify the specific pinout labels on the silk screen, as NTC breakout topologies can vary between VCC-Signal-GND)*.

### Board Pinout

<table><thead><tr><th width="153.6953125" align="center">(J1) Pin Number</th><th width="194.5234375" align="center">Pin Name</th><th>Description</th></tr></thead><tbody><tr><td align="center">1</td><td align="center">VCC</td><td>Power Supply</td></tr><tr><td align="center">2</td><td align="center">SCL</td><td>I<sup>2</sup>C Serial Clock Pin</td></tr><tr><td align="center">3</td><td align="center">SDA</td><td>I<sup>2</sup>C Serial Data Pin</td></tr><tr><td align="center">4</td><td align="center">GND</td><td>Ground</td></tr></tbody></table>

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### Applications

* HVAC Systems: Air duct temperature monitoring for climate control feedback loops.
* 3D Printers: Heated bed and hot-end temperature regulation.
* Battery Management Systems (BMS): Thermal runaway detection for Li-Ion battery packs.
* PC Hardware: Case and CPU temperature monitoring for fan speed control.

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### Board Dimensions:

![TH09C Dimension](https://github.com/Boardoza/Boardoza_TH09C_Temperature_Humidity_Sensor_Breakout_Board/raw/main/assets/TH09C%20Dimensions.png)

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{% hint style="info" %}
Ready to integrate? You can purchase the **TH09C Temp Sensor** directly from our [Online Store](https://www.robotshop.com/products/acrome-temp-sensor-breakout-board?qd=8da01df86a103994656f728682846c03). Worldwide shipping is available for engineering samples and production batches.
{% endhint %}

{% embed url="<https://www.youtube.com/watch?v=jYhk3OW2h8A>" %}