Temperature and Humidity Sensors: Selection and Sourcing Guide

Combined temperature and humidity sensors provide simultaneous environmental monitoring in a single compact package, eliminating the need for two discrete sensing elements. These sensors are essential across industries where precise climate data drives process control, quality assurance, and regulatory compliance. ADD Components sources temperature and humidity sensor modules from Sensirion, Bosch Sensortec, Texas Instruments, Honeywell, and Aosong, supporting OEMs and contract manufacturers with competitive lead times for prototype and production quantities.

Product Types and Variants

Digital I2C/SPI Combination Sensors

Modern digital temperature and humidity sensors integrate the sensing element, analog front-end, ADC, and digital interface on a single die. Sensirion’s SHT3x and SHT4x families represent the industry benchmark, utilizing a CMOSens chip that combines a capacitive humidity sensing element with a bandgap temperature sensor on the same substrate. The SHT30-DIS-B delivers ±2% RH and ±0.3°C accuracy with calibrated digital output over I2C in a 2.5 × 2.5 mm DFN package. The SHT40-AD1B pushes accuracy to ±1.8% RH and ±0.2°C, while the SHT85 incorporates a PTFE membrane filter for harsh or condensing environments such as cold chain logistics and outdoor weather stations. All Sensirion SHT sensors feature factory calibration stored on-chip, enabling plug-and-play integration.

Bosch Sensortec’s BME280 adds barometric pressure measurement to temperature and humidity sensing in a single 2.5 × 2.5 mm LGA package, making it popular for indoor air quality monitors, weather stations, and altitude-tracking IoT devices. With ±3% RH, ±0.5°C, and ±1 hPa accuracy across I2C and SPI interfaces, the BME280 delivers three environmental parameters from one footprint. Texas Instruments offers the HDC1080 and HDC2010 series, both providing ±2% RH and ±0.2°C typical accuracy with ultra-low power consumption down to 0.1 μA in sleep mode - a critical specification for battery-powered wireless sensor nodes in cold chain monitoring and smart agriculture deployments.

Capacitive Analog Output Sensors

For designs where the system MCU already incorporates a high-resolution ADC, analog-output humidity sensors offer a cost-optimized path. Honeywell’s HIH-4000 series outputs a linear voltage proportional to relative humidity, with 0-100% RH range and ±3.5% RH accuracy. The HIH-5030 extends this to surface-mount with an SMD package. These analog sensors are widely used in HVAC air handling units, compressor control systems, and industrial drying processes.

Discrete Sensor Probes and Modules

Aosong’s DHT22 (also sold as AM2302) remains one of the most widely deployed temperature and humidity sensors in the maker, educational, and light industrial segments. With a measurement range of -40 to 80°C and 0 to 100% RH, and typical accuracy of ±2% RH and ±0.5°C, the DHT22 uses a capacitive humidity sensor and thermistor combined with a dedicated 8-bit MCU that outputs calibrated digital data over a single-wire protocol. The DHT11 provides a lower-cost entry point with ±5% RH accuracy for basic environmental monitoring applications.

Key Selection Parameters

• Humidity Accuracy: ±1.5% to ±5% RH. Sensirion SHT85 delivers ±1.5% for precision applications; DHT11 at ±5% suits non-critical monitoring.

• Temperature Accuracy: ±0.1°C to ±1°C. SHT85 and HDC2010 achieve ±0.1°C typical; budget sensors operate at ±0.5 to ±1°C.

• Interface: I2C (SHT3x/SHT4x, HDC1080, HDC2010, BME280), SPI (BME280), single-wire (DHT22), or analog voltage (HIH-4000). Match interface to your MCU peripheral availability.

• Supply Voltage and Power Budget: 1.08V to 5.5V range across parts. HDC2010 draws 0.1 μA in sleep mode for battery-powered designs. Consider average and peak current for your power envelope.

• Package and Ingress Protection: DFN, LGA, and pin-type packages available. SHT85’s PTFE membrane protects against dust and condensation. For outdoor installations, evaluate sensor housing and breathable membrane requirements.

• Measurement Range: Validate against your environment. Most sensors cover 0-100% RH and -40 to 125°C, but confirm operating conditions including condensation tolerance.

• Response Time: t63% humidity response ranges from 2 seconds (SHT4x) to 5-10 seconds (DHT22). Fast response is critical in HVAC damper control and process drying applications.

• Long-Term Drift: Sensirion sensors specify less than 0.25% RH per year. Evaluate manufacturer drift specifications for products deployed in inaccessible locations requiring multi-year maintenance-free operation.

Representative Sensors We Source

Common Applications

Temperature and humidity sensors are deployed across diverse industrial and commercial environments. In HVAC and building automation, they enable demand-controlled ventilation and chiller optimization to reduce energy consumption. Cold chain logistics providers depend on Sensirion SHT3x sensors to monitor refrigerated containers and pharmaceutical transport for GDP compliance. Precision agriculture and greenhouse automation use multi-sensor arrays with BME280 and DHT22 nodes to regulate irrigation and ventilation based on real-time microclimate data. Data center operators deploy SHT40 and HDC2010 sensors for hot aisle/cold aisle monitoring to prevent thermal runaway. Consumer IoT products leverage the low power consumption of digital sensors to achieve years of battery life from a single coin cell.

Send Us Your Sensor Requirements

ADD Components provides end-to-end procurement support for temperature and humidity sensors - from part selection and cross-reference assistance through to competitive pricing, inventory management, and scheduled deliveries. Our supply chain team maintains active relationships with Sensirion, Bosch Sensortec, Texas Instruments, Honeywell, and Aosong, giving customers access to allocation-constrained lines and alternative sourcing options. Whether you need a single reel for prototyping, a multi-quarter production forecast, or an urgent spot buy to prevent a line-down situation, our team delivers responsive service. Contact us with your part numbers, target quantities, and delivery schedule for a quotation within one business day.

Email: Info@addcomponents.hk | Phone: +852 5334 3091 | WhatsApp: +852 5334 3091

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