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.

Lifecycle Status


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