MRF428

The MRF428 is designed for high-voltage application as a high-power linear amplifier from 2.0 to 30MHz. The features of MRF428 are: (1)specified 50 V, 30 MHz characteristics: output power=60 W (PEP),  minimum gain=13 dB and efficiency=45%; (2)intermodulation distortion @ 150W: IMD=-32db max; (3)100% tested for load mismatch at all phase angles with 30:1 VSWR @ 150W CW.

The following is about the absolute maximum ratings of MRF428: (1)collector-emitter voltage, VCEO: 55 V; (2)collector-base voltage, VCBO: 110 V; (3)emitter-base voltage, VEBO: 4.0 V; (4)total device dissipation @ TC=25, PD: 320 W and derate 1.83 W/ above 25 ; (5)storage temperature range, Tstg: -65 to +150; (8)thermal resistance, junction to case, RJC: 0.5/W.

The electrical characteristics of the MRF428 are: (1)collector-emitter breakdown voltage: 55V at IC=200mA, IB=0; (2)collector-emitter breakdown voltage: 110V min at IC=100mA, VBE=0; (3)emitter-base breakdown voltage: 4.0V at IE=10mA, IC=0; (4)DC current gain: 10 min and 150 max at IC=5.0A, VCE=5.0V; (5)output capacitance: 220pF min and 250pF max at VCB=50V, IE=0, f=1.0MHz.