Silicon Bipolar Darlington Amplifier

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The ADA-4543 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-4543 delivers gain of 15.1dB, OIP3 of 15.0dBm and P1dB of 1.9dBm at 15mA/3.4V 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


Replacement Part

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Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Obsolete
Distrib. Inventory No
Cur Bias In Ma (mA) 15.0
Freq Max In Ghz 2.5
Gain Ctgn Moderate
Gain Db 47sa 15.46
Gain In Db 15.1
RoHS6 Compliant Y
Nfo Db 47sa 3.8
Noise Fig In Db 3.7
Operating Frequency 47sa 0.1GHz
Pwr Out In Dbm 1.9
Rev Isltn Db 19.0
Test Bias Current (mA) 15.0
Test Bias Voltage (V) 3.4
Vbias In V 3.4
Vo Max In V 3.5
Vo Min In V 3.3
Frequency (GHz) DC-2.5
Bias Condition (V@mA) 3.4V@15mA
NF (dB) 3.7
Gain (dB) 15.1
P1dB (dBm) 1.9
OIP3 (dBm) 15
Package SOT-343
Vo Min In V 3.3
Vo Max In V 3.5
ADS Model 1 i
Data Sheet1 i
Obsolescence Notice1 i
Product Change Notice (PCN)5 i
Reliability Data Sheet1 i
S-Parameter4 i


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