• Fits SOT-343 (SC-70) amplifier 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

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 different RF MMIC amplifiers 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 fit the

MicroAmp MH series of connectorized housings that allow it to be used as a single amplifier stage or cascaded with other MicroAmp

boards for added versatility. Boards are fabricated from a high-performance 13 mil thick RO-4350 laminate with RoHS compatible

ENIG plating (electroless nickel/immersion gold) on both the component side and the solid bottom ground plane. The board

measures 0.490" x 0.590" and mounts into the housing with four #1-72 screws. Amplifiers 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 flexible 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 after 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)

Amplifier

J1

Input

J2

Output

J3

Bias

FEATURES