? fits sot-343 (sc-70) ampli?er packages ? input/output blocking capacitors ? rf bypass and bias capacitors ? dual bias resistors ? rf bias inductor ? ro-4350 board material ? fits microamp mh-series housings assembly amplifier schematic for additional product information, plea s e visit www .twinind.com contact information: 925-866-8946 (phone) 925-866-8937 (fax) sales@twinind.com microamp MB-4 circuit board for sot-343 (sc-70) amplifiers the microamp MB-4 circuit board is designed for rapid prototyping of many di?erent rf mmic ampli?ers in sot-343 (sc-70) 4-pin packages that use a common rf output and bias pin from manufacturers such as avago (ada) and others. this board will ?t the microamp mh series of connectorized housings that allow it to be used as a single ampli?er stage or cascaded with other microamp boards for added versatlity. boards are fabricated from a high-performance 13 mil thick ro-4350 laminate with rohs compatble enig platng (electroless nickel/immersion gold) on both the component side and the solid botom ground plane. the board measures 0.490" x 0.590" and mounts into the housing with four #1-72 screws. ampli?ers can be easily designed and assembled with standard surface-mount passive components. it includes provisions for input and output dc blocking capacitors (0603), rf and bias bypass capacitors (0603/0805), dual bias resistors for ?exible thermal management (0805), and a rf bias inductor (0805 or 0603). pads for the rf connectors allow the sma center pins to be easily soldered to the board afer it is installed into the housing, as well as a large pad to connect the completed board assembly to the bias feed-through. ref size function c1 0603 dc block c2 0603 dc block c3 0603 bypass c4 0603 bypass c5 0805 bypass r1 0805 dc bias r2 0805 dc bias l1 0805/0603 rf bias u1 sot-343 (sc-70) ampli?er j1 input j2 output j3 bias features
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