Silicon Bipolar Darlington Amplifier
Avago Technologies’ ADA-4543 is an economical, easy-to-
use, general purpose silicon bipolar RFIC gain block am-
plifiers housed in a 4-lead SC-70 (SOT-343) surface mount
plastic package which requires only half the board space
of a SOT-143 package.
The Darlington feedback structure provides inherent
broad bandwidth performance, resulting in useful oper-
ating frequency up to 2.5 GHz. This is an ideal device for
small-signal gain cascades or IF amplification.
ADA-4543 is fabricated using Avago’s HP25 silicon bi-
polar process, which employs a double-diffused single
polysilicon process with self-aligned submicron emitter
geometry. The process is capable of simultaneous high fT
and high NPN breakdown (25 GHz fT at 6V BVCEO). The
process utilizes industry standard device oxide isolation
technologies and submicron aluminum multilayer inter-
connect to achieve superior performance, high uniformi-
ty, and proven reliability.
Surface Mount Package
• Small Signal gain amplifier
• Operating frequency DC – 2.5 GHz
• Unconditionally stable
• 50 Ohms input & output
• Flat, Broadband Frequency Response up to 1 GHz
• Operating Current: 10 to 30 mA
• Industry standard SOT-343 package
• Lead-free option available
900 MHz, 3.4V, 15 mA (typ.)
• 15.1 dB associated gain
• 1.9 dBm P1dB
• 15 dBm OIP3
• 3.7 dB noise figure
• VSWR < 2 throughput operating frequency
• Single supply, typical Id = 15 mA
• Cellular/PCS/WLL base stations
• Wireless data/WLAN
• Fiber-optic systems
Pin Connections and Package Marking
Top View. Package marking provides orientation and identification.
“1T” = Device Code
“x” = Date code character
identifies month of manufacture.
Observe precautions for handling
electrostatic sensitive devices.
ESD Machine Model (Class A)
ESD Human Body Model (Class 1B)
Refer to Avago Application Note A004R:
Electrostatic Discharge Damage and Control.
Typical Biasing Configuration
VCC = 5 V
Vd = 3.4 V