2N998 Description
2N998 (SILICON) Darlington amplifier containing two NPN silicon annular transistors is designed for applications requiring very high-gain, low-noise, and high-input impedance. Pulse Width = 300 "S, Duty Cycle = 1% ··Measured with constant current supply of 20 ItAdc connected to the emitter of the input transistor. (See Figure 1) FIGURE 1- NOISE-FIGURE TEST CIRCUIT Unit Yde Yde Yde "Ade p.Adc - pF pF - dB 2-147.