VERIFIED CROSS-REFERENCE
AM2302 alternatives & equivalent parts
Calibrated digital temperature/humidity sensor; proprietary timed single-bus protocol (not Dallas/Maxim 1-Wire); 0-99.9% RH, -40C to +80C; about +/-2% RH and +/-0.5C; 3.3-5.5 V — common packages: 4-lead wired module (VDD, DATA, NC, GND). Each candidate below cites its manufacturer datasheet; check the relationship badge before substituting.
4 verified alternatives for AM2302
| Alternative | Manufacturer | Relationship | Key differences | Source |
|---|---|---|---|---|
| DHT22 | Aosong | Pin-to-pinDrop-in: same footprint and pinout. | Aosong's own datasheet names DHT22 as AM2302: same 4-pin module, protocol, and specs; third-party mirror of official datasheet. | 数据手册（第三方托管，购买前请核对原厂） |
| AHT20 | Aosong | FunctionalSame function: board or design change needed. | I2C interface with fixed slave address 0x38, not single-bus; DFN-6 SMD 3x3x1 mm versus the 4-lead wired module; +/-2% RH, +/-0.3C; 2.2-5.5 V; same manufacturer (Aosong). | Aosong 官方数据手册 |
| SHT31-DIS-B | Sensirion | FunctionalSame function: board or design change needed. | I2C up to 1 MHz with two selectable addresses; DFN-8 2.5x2.5x0.9 mm; +/-2% RH, about +/-0.2-0.3C; 2.15-5.5 V; no single-bus compatibility. | Sensirion 官方数据手册 |
| HDC3020DEFR | Texas Instruments | FunctionalSame function: board or design change needed. | I2C up to 1 MHz with four selectable addresses and CRC checksum; WSON-8 2.5x2.5 mm; +/-0.5% RH, +/-0.1C; -40C to +125C; 1.62-5.5 V; listed ACTIVE in TI's official datasheet packaging addendum. | TI 官方数据手册 |
Pre-replacement checklist
- Protocol is Aosong's timed single-bus, not Dallas/Maxim 1-Wire - do not mix driver libraries.
- Poll no faster than every 2 s and pull DATA up (about 5.1 kΩ) to VDD.
- I2C alternatives (AHT20, SHT31, HDC3020) need new driver code and a different footprint.
- Only DHT22 is a true drop-in; all others are redesign candidates.
Need the exact lot, date code or a second source quoted?
Send the original MPN and the approved alternative. Sourceics reconfirms source, stock, date code and commercial terms before any order — no substitution without your engineering approval.
Request a quote for AM2302Source part reference: AM2302 规格书（第三方托管，购买前请核对原厂）. Equivalence notes are reference guidance, not a guarantee of fit — always verify against your schematic and layout.