The IA35 is a heterostructure photodiode on an InAs substrate with a relatively wide peak at 2.8µ.
The IA35 has a 0.5mm diameter chip and is designed specifically for uncooled operation and has a spectral range of up to 3.5µ, 20% cut off.
The curve of the spectral response can be seen in the image shown.
Compared to standard InAs products the IA35 offers double the shunt resistance with a quadrupled area.
The devices are manufactured in standard TO style packages and have long expected lifetimes making them suitable for fit and forget applications such as gas analysis, noncontact temperature measurement, laser monitoring and spectrophotometry.