Silicon Bipolar Darlington Amplifier

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The ADA-4643 is a general purpose Silicon Bipolar Darlington Amplifier housed in an industry standard SOT-343 (4-lead SC70) package. The device is a current driven amplifier that operates on a single current supply. It also exhibits flat gain, high linearity and unconditional stability.


  • At 900MHz, the ADA-4643 delivers gain of 17.0dB, OIP3 of 28.3dBm and P1dB of 13.4dBm at 35mA/3.5V biasing. Internal input and output 50-ohm matching makes it simple to use with little design efforts, making it an excellent choice for IF, buffer and general purpose amplifiers for the wireless communications market.


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
Cur Bias In Ma (mA) 35.0
Freq Max In Ghz 2.5
Gain Ctgn Moderate
Gain In Db 17.0
RoHS6 Compliant Y
Noise Fig In Db 4.0
Pwr Out In Dbm 13.4
Rev Isltn Db 21.0
Test Bias Current (mA) 35.0
Test Bias Voltage (V) 3.5
Vbias In V 3.5
Vo Max In V 3.7
Vo Min In V 3.3
Frequency (GHz) DC-2.5
Bias Condition (V@mA) 3.5V@35mA
NF (dB) 4.0
Gain (dB) 17
P1dB (dBm) 13.4
OIP3 (dBm) 28.3
Package SOT-343
Vo Min In V 3.3
Vo Max In V 3.7

ADS Model 1 i
Application Note1 i
Data Sheet1 i
Product Change Notice (PCN)5 i
Reliability Data Sheet1 i
S-Parameter4 i


Demostration Circuit Board for ADA-4543, ADA-4643, ADA-4743