Details, datasheet, quote on part number: MRF492
CategoryDiscrete => Transistors => Bipolar => RF
DescriptionRF Power Transistor NPN Silicon
CompanyMotorola Semiconductor Products
DatasheetDownload MRF492 datasheet
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Features, Applications

Designed for 12.5 volt low band VHF large­signal power amplifier applications in commercial and industrial FM equipment. Specified V, 50 MHz Characteristics Output Power 70 W Minimum Gain 11 dB Efficiency = 50% Load Mismatch Capability at High Line and RF Overdrive

Rating Collector­Emitter Voltage Collector­Base Voltage Emitter­Base Voltage Collector Current Continuous Total Device Dissipation 25°C (1) Derate above 25°C Storage Temperature Range Symbol VCEO VCBO VEBO IC PD Tstg Value to +150 Unit Vdc Adc Watts W/°C °C CASE 211­11, STYLE 1

Characteristic Thermal Resistance, Junction to Case (2) Symbol RJC Max 0.7 Unit °C/W

Collector­Emitter Breakdown Voltage (IC = 100 mAdc, = 0) Collector­Emitter Breakdown Voltage (IC = 50 mAdc, VBE = 0) Emitter­Base Breakdown Voltage (IE = 10 mAdc, = 0) Collector Cutoff Current (VCE = 13.6 Vdc, VBE = 0) V(BR)CEO V(BR)CES V(BR)EBO ICES Vdc mAdc

Common­Emitter Amplifier Power Gain (VCC = 12.5 Vdc, Pout = 50 MHz) Collector Efficiency (VCC = 12.5 Vdc, Pout = 50 MHz) GPE dB %

NOTES: 1. These devices are designed for RF operation. The total device dissipation rating applies only when the devices are operated as RF amplifiers. 2. Thermal Resistance is determined under specified RF operating conditions by infrared measurement techniques.

­ 180 pF, Arco ­ 480 pF, Arco C5 1000 pF, 350 V, Unelco C6 10 µF, 25 Vdc C7 0.01 µF, Ceramic 10 µH Molded Choke

RFC2 12 Turns, #16 AWG, Enameled Wire Closewound 2.0 W Carbon Resistor L1 2 Turns, #18 AWG Enameled Wire, 0.4 ID, 0.15 Long L2 Loop, #12 AWG Wire, 0.6 High, 0.4 Wide L3 2 Turns, #12 AWG Wire, 0.4, 0.25 Long Bead Ferrite Bead Ferroxcube #56­590­65/3B


Figure 2. Output Power versus Input Power
Figure 4. Output Power versus Supply Voltage

ZOL* = Conjugate of the optimum load ZOL* = impedance into which the device ZOL* = output operates at a given output ZOL* = power, voltage and frequency.


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