Details, datasheet, quote on part number: MRF644
PartMRF644
CategoryDiscrete => Transistors => Bipolar => RF
DescriptionRF Power Transistor NPN Silicon
CompanyMotorola Semiconductor Products
DatasheetDownload MRF644 datasheet
Cross ref.Similar parts: CM20-12
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Features, Applications

. designed for 12.5 Volt UHF large­signal amplifier applications in industrial and commercial FM equipment operating to 512 MHz. Specified 12.5 Volt, 470 MHz Characteristics Output Power = 25 Watts Minimum Gain 6.2 dB Efficiency = 60% Characterized with Series Equivalent Large­Signal Impedance Parameters Built­In Matching Network for Broadband Operation Tested for Load Mismatch Stress at all Phase Angles with 20:1 VSWR @ 16­Volt High Line and 50% Overdrive Circuit board photomaster available upon request by contacting RF Tactical Marketing in Phoenix, AZ.

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

Characteristic Thermal Resistance, Junction to Case Symbol RJC Max 1.7 Unit °C/W

Collector­Emitter Breakdown Voltage (IC = 20 mAdc, = 0) Collector­Emitter Breakdown Voltage (IC = 20 mAdc, VBE = 0) Emitter­Base Breakdown Voltage (IE = 5.0 mAdc, = 0) Collector Cutoff Current (VCE = 15 Vdc, VBE = 25°C) V(BR)CEO V(BR)CES V(BR)EBO ICES Vdc mAdc (continued)

ELECTRICAL CHARACTERISTICS continued (TC = 25°C unless otherwise noted.)

Common­Emitter Amplifier Power Gain (VCC = 12.5 Vdc, Pout W, IC (MAX) = 3.6 Adc, = 470 MHz) Input Power (VCC = 12.5 Vdc, Pout = 470 MHz) Collector Efficiency (VCC = 12.5 Vdc, Pout W, IC (MAX) = 3.6 Adc, = 470 MHz) Output Mismatch Stress (VCC = 16 Vdc, Pin = Note = 470 MHz, VSWR = 20:1, All Phase Angles) Series Equivalent Input Impedance (VCC = 12.5 Vdc, Pout = 470 MHz) Series Equivalent Output Impedance (VCC = 12.5 Vdc, Pout = 470 MHz) Gpe Pin * No Degradation in Output Power Zin ZOL + j2.1 Ohms dB Watts %

NOTE: 1. Pin 150% of Drive Requirement for 25 W Output at 12.5 Vdc. * = Mismatch stress factor the electrical criterion established to verify the device resistance to load mismatch failure. The mismatch stress test is accomplished in the standard test fixture (Figure 1) terminated a 20:1 minimum load mismatch at all phase angles. RFC1

680 pF Feedthrough 5 #22 AWG 5 #20 AWG ID RFC1 Ferroxcube VK200­20­4B B Ferroxcube Bead x 0.20 Microstrip x 0.20 Microstrip

x 0.20 Microstrip 1/2 #18 AWG bent Z4, Z5 "V" shape 1/8 Wide x 0.20 Microstrip x 0.20 Microstrip x 0.20 Microstrip x 0.20 Microstrip Board 62.5 mil Glass Teflon, = 2.55

Figure 1. Test Circuit Schematic MRF644 2 MOTOROLA RF DEVICE DATA
40 Pout , POWER OUTPUT (WATTS) Pout , POWER OUTPUT (WATTS) = 470 MHz 30 VCC V 20
Figure 2. Power Output versus Power Input
40 Pout , POWER OUTPUT (WATTS) = 470 MHz Pin W 20 Pout , minus Pin (WATTS) 30
Figure 4. Power Output versus Supply Voltage

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


 

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