MMBT3904LT1G by Onsemi is a NPN BJT with max. collector-emitter voltage of 40V, hFE of 30, and fT of 300MHz. Ideal for small signal applications in electronics due to its compact size, high transition frequency, and low power dissipation capabilities.
LM107H by Linear Technology is an Operational Amplifier with a max input offset voltage of 3000uV, common mode reject ratio of 96dB, and min voltage gain of 50000. It is used in military applications due to its MILITARY temperature grade and BIPOLAR technology for precise signal processing in harsh environments.
ULN2803ADWR by Texas Instruments is a peripheral driver with 8 functions, open-collector output characteristics, and built-in transient protections. It operates b/w -40 to 85°C, has a max supply voltage of 3V, and is ideal for buffer or inverter-based applications requiring sink current flow direction.