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VIPER20A Information
VIPER20A by STMicroelectronics is a Switching Regulator or Controller.
Switching Regulator or Controllers are under the broader part category of Power Circuits.
A power circuit delivers electricity in order to operate a load for an electronic device. Power circuits include transformers, generators and switches. Read more about Power Circuits on our Power Circuits part category page.
US Tariff Estimator: VIPER20A by STMicroelectronics
Calculations from this tool are estimations only for imports into the United States. Please refer to the distributor or manufacturer and reference official US government sources and authorities to verify any final purchase costs.
This table gives cross-reference parts and alternative options found for VIPER20A. The Form Fit Function (FFF) tab will give you the options that are more likely to serve as direct pin-to-pin alternates or drop-in parts. The Functional Equivalents tab will give you options that are likely to match the same function of VIPER20A, but it may not fit your design. Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.
STMicroelectronics provides a recommended PCB layout in the VIPER20A application note (AN4571) which includes guidelines for component placement, thermal management, and routing to minimize electromagnetic interference (EMI) and ensure reliable operation.
The transformer selection depends on the input voltage, output voltage, and power rating of the VIPER20A. STMicroelectronics provides a transformer selection guide in the VIPER20A datasheet, and also recommends using transformers from approved vendors such as TDK, Coilcraft, or Würth Elektronik.
The VIPER20A is rated for operation up to 150°C junction temperature, but the maximum ambient temperature depends on the specific application and cooling conditions. As a general guideline, STMicroelectronics recommends keeping the ambient temperature below 85°C for reliable operation.
To ensure EMC compliance, follow the guidelines in the VIPER20A application note (AN4571) for PCB layout, component selection, and shielding. Additionally, use a common-mode choke and Y-capacitors to filter the input and output lines, and consider using a metal enclosure or shielded cables to reduce radiated emissions.
STMicroelectronics recommends using a low-ESR ceramic capacitor (X7R or X5R dielectric) with a value between 1uF to 10uF, depending on the input voltage and frequency. The capacitor should be placed close to the VIPER20A input pins to minimize noise and ensure stable operation.