CRF-20A-250 SQ DIRECTIONAL COUPLERS REV: 001, 04/18/02 • SPACE QUALIFIED • 5 - 500 MHz DIRECTIONAL COUPLER • FORWARD AND REVERSE COUPLING SERIES 05 TECHNICAL DESCRIPTION / APPLICATION The CRF-20A-250 SQ Directional Coupler covers 5 - 500 MHz with a special lumped element design to reduce size, while maintaining high performance. Parts, materials and processes are in accordance with Merrimac document CENG-0001, “Standard Design Requirements for Space Qualified Devices”. GENERAL SPECIFICATIONS MODEL NUMBER CRF-20A-250 SQ FREQUENCY RANGE COUPLING INSERTION LOSS dB DIRECTIVITY dB VSWR MHz dB MAX. MIN. MAX. 5 - 500 20 ± 1 1.0 18 1.5:1 FREQUENCY SENSITIVITY dB WEIGHT MAX. MAX. CW POWER RATING MAIN LINE MAX. ± 0.75 1 WATT 2.8 g PACKAGE OUTLINE .312 ± .030 .150 MAX. [3.81] [7.92 ± 0.76] (TYP) IN OUT .385 ± 0.020 [9.78 ± .508] *.350 TYP. [8.89] .510 ± 0.020 [12.94 ± 0.508] FWD REV *.250 TYP. [6.35] *.015 ± 0.005 [0.38 ± 0.127] TYP. 8 PINS NOTES: 1. TOLERANCE ON 3 PLACE DECIMALS ± .010 [.25mm] EXCEPT AS NOTED. 2. MAX. IS LARGEST DIMENSION ALLOWED. 3. DIMENSIONS = INCHES [mm] 4. METRIC EQUIVALENTS ARE TO THE NEAREST .01 mm. *.100 TYP. [2.54] *.080 TYP. [2.03] 5 *.050 ± 0.015 [1.27 ± 0.381] 5. ALL LEADS TO BE WITHIN ±.010 [.25mm] OF EACH OTHER AT THIS DIMENSION. 6. DIMENSIONS MARKED WITH * APPLY ONLY AT BODY. 7. ALL UNMARKED PINS ARE CASE GROUND. Merrimac Industries, RF & Microwave Products Division / 41 Fairfield Place, West Caldwell, NJ 07006 Tel: 973.575.1300 / Fax: 973.575.0531 / Internet: www.Merrimacind.com