6 of the 13 features in our table differ between the SGP30 and the SGP40.
TVOC · eCO₂ (estimated) · I²C · 1.62 to 1.98 V
Sensirion’s earlier metal-oxide sensor with TVOC and eCO₂ outputs, found on many older boards.
Watch out: End of life: Sensirion moved new designs to the SGP40 and SGP41. Its eCO₂ is estimated from VOCs, and the chip itself runs at 1.8 V.
VOC index · I²C · 1.7 to 3.6 V
A metal-oxide sensor that gives a VOC index (1 to 500) through Sensirion’s algorithm, 2.6 mA at 3.3 V.
Watch out: No CO₂ reading. The algorithm runs on your microcontroller (ESPHome includes it).
| Feature | SGP30 | SGP40 |
|---|---|---|
| Measures | TVOC · eCO₂ (estimated) | VOC index |
| I²C address | 0x58 | 0x59 |
| Supply | 1.62 to 1.98 V | 1.7 to 3.6 V |
| Lowest average current | 48.8 mA | 2.6 mA |
| ESPHome | sgp30 | sgp4x |
| Status | End of life | Available |
Same on both: technology · interface.
In our table the SGP30 has nothing the SGP40 lacks, and it is at the end of its life: choose it only for price or a board you already have.
Open the sensor comparison →Tick what your project needs and see which sensor fits best.
SGP30: I²C address, wiring and pull-ups →
SGP40: I²C address, wiring and pull-ups →
The SGP40 offers a chip that runs straight from 3.3 V, a lower average current, and a part still in production; in our table the SGP30 has no advantage of its own apart from price, and it is at the end of its life.
They measure different things: the SGP30 gives TVOC and eCO₂ (estimated), the SGP40 VOC index. Choose by what you want to know.
Often yes: both use I²C. Change the driver or, in ESPHome, the component (sgp30 → sgp4x). The I²C address changes too (0x58 → 0x59). Check the supply too: 1.62 to 1.98 V for the SGP30, 1.7 to 3.6 V for the SGP40.
SCD40 vs MH-Z19C SCD40 vs SCD30 SCD40 vs SCD41 ENS160 vs CCS811 PMS5003 vs SDS011
Figures from the makers’ datasheets and product pages and the ESPHome documentation, checked in November 2026.