The 2SA1122 is a low frequency amplifier produced by NXP. Its maximum collector voltage is -55V, its maximum collector-emitter voltage is -55V, its maximum emitter-base voltage is -5V, its maximum collector current is -100mA, its maximum collector power dissipation is 150mW, its junction temperature is 150 °C, and its storage temperature is -55 to +150 °C.