DFN stands for dual flat no leads. The humidity sensor
opening is centered on the top side of the package.
The sensor chip is made of silicon and is mounted to a
lead frame. The latter is made of Cu plated with Ni/Pd/Au.
Chip and lead frame are overmolded by a green epoxybased
mold compound. Please note that the side walls of
sensor are diced and therefore these diced lead frame
surfaces are not covered with the respective plating.
All SHTC1 sensors are laser marked for easy identification
and traceability. The marking on the sensor consists of two
lines and a pin-1 indicator. The top line contains the
sensor type (SHTC1), the bottom line contains a 5-digit,
alphanumeric tracking code. The pin-1 indicator is located
in the top left corner. See Figure 8 for illustration.