www.aosong.com

Version:V1.0 —— May 2021

AHT20 Data Sheet

3 / 16

Electrical Specifications

Package Information

Table 3. Electrical characteristics.

Table 4. Package

3 Expansion Performance

3.1 Operating Conditions

The sensor has stable performance within the recommended working range, as shown in Figure 4. Long-term

exposure to conditions outside the normal range, especially when the humidity is> 80%, may cause temporary

signal drift (drift + 3% RH after 60 hours). After returning to normal working conditions, the sensor will slowly self-

recover to the calibration state. Refer to "Recovery Processing" in section 4.3 to speed up the recovery process.

Long-term use under abnormal conditions will accelerate the aging of the product.

Figure 4. Working conditions

1. This accuracy is based on the sensor's test accuracy at a supply voltage of 3.3Vat 25°C when tested at the factory. This value

does not include hysteresis and non-linearity and applies only to non-condensing conditions.

2. Time required to achieve 63% first-order response at 25°C and 1 m/s airflow.

3. Normal operating range: 0-80%RH, beyond this range, there will be deviation in the sensor reading (after 60hours in 90%RH

humidity, drift >3%RH).

4. If there are volatile solvents, tapes with pungent odors , adhesives, and packaging materials around the sensor, the readings may

shift. For details, please refer to the relevant documents.

5. The minimum and maximum values for supply current and power consumption are based on VCC = 3.3V and T < 60°C. The mean

value is the value of one measurement taken in every two seconds.

6. The response time depends on the thermal conductivity of the sensor substrate.