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The SI4542DY is a power MOSFET manufactured by Fairchild Semiconductor (now part of ON Semiconductor). Below are the factual specifications, descriptions, and features from the Manufactor Datasheet:

Specifications:

• Manufacturer: FAIRCHILD (now part of ON Semiconductor)
• Part Number: SI4542DY
• Type: Dual N-Channel MOSFET
• Technology: TrenchFET®
• Drain-Source Voltage (V_DSS): 30V
• Gate-Source Voltage (V_GSS): ±20V
• Continuous Drain Current (I_D): 6.3A per channel
• Pulsed Drain Current (I_DM): 25A per channel
• Power Dissipation (P_D): 2W per channel
• On-Resistance (R_DS(on)): 0.028Ω (max) at V_GS = 10V
• Threshold Voltage (V_GS(th)): 1V to 2.5V
• Total Gate Charge (Q_g): 16nC (typical)
• Input Capacitance (C_iss): 1100pF (typical)
• Output Capacitance (C_oss): 400pF (typical)
• Reverse Transfer Capacitance (C_rss): 100pF (typical)
• Operating Temperature Range: -55°C to +150°C
• Package: SOIC-8

Description:

The SI4542DY is a dual N-channel MOSFET designed for high-efficiency power management applications. It features low on-resistance and fast switching performance, making it suitable for DC-DC converters, motor control, and load switching.

Features:

• Low R_DS(on) for reduced conduction losses.
• Optimized for high-frequency switching in power applications.
• TrenchFET® technology for improved performance.
• Dual N-Channel configuration in a single package.
• Lead-free and RoHS compliant.

This information is based solely on the manufacturer's datasheet and technical documentation.