A method for die-attach based on sintering of micro- and nano-silver-particles, which is stable in harsh environments, was described. A modified flip-chip bonder providing high placement accuracy was used for precise pick and place die-attach. Components of sensors designed for data logging during deep drilling, i.e., a MEMS vibration sensor and a MOEMS pressure sensor, were assembled and tested at temperatures up to 250°C. Shear tests of bonded devices were performed before and after temperature load. Bonded silicon-on-insulator Wheatstone bridges and GaP-PD were tested by temperature cycling (50 cycles from 100°C up to 250°C).