Si4778dy

Updated October 6, 2026

Overview

Product sourcing insights & recommendations

20 来源

The Si4778DY is a legacy N-channel power MOSFET primarily designed for efficient power switching and DC-DC conversion in compact electronic applications. While still available through specialized distributors, the market is shifting toward higher-efficiency TrenchFET® and Silicon Carbide (SiC) alternatives.

Product Insights & Specifications

The device is a low-voltage, medium-current switch optimized for low conduction losses. Alibaba Digchip

* Key Parameters: 25V Drain-to-Source Voltage ($V_{DSS}$), 8A Continuous Drain Current ($I_D$), and 23 mΩ $R_{DS(on)}$. Alibaba

* Package: 8-SOIC (Small Outline Integrated Circuit) for surface mounting. Digchip

* Applications: Commonly used in power management for older LCD TVs (e.g., Philips chassis), switch-mode power supplies, and logic-level switching. Scribd Digchip

Market Trends (2025–2034)

The broader MOSFET market is undergoing a structural shift driven by electrification and AI infrastructure. Straitsresearch Maximizemarketresearch

* Growth Drivers: The power MOSFET market is projected to grow at a CAGR of 6.6% to 8.1% through 2033. Demand is primarily fueled by EV charging, AI server power trains (48V rails), and industrial automation. Mordorintelligence Skyquestt

* Technological Transition: While silicon MOSFETs like the Si4778DY remain standard for cost-sensitive legacy designs, new growth is concentrated in Silicon Carbide (SiC) and Gallium Nitride (GaN) devices, which offer superior thermal conductivity and efficiency for high-performance systems. Utmel Wiseguyreports

* Supply Chain: Recent trends indicate a move toward near-shored SiC production and AI-optimized logistics to combat maritime freight surcharges and regional supply instabilities. Maximizemarketresearch

Sourcing & Pricing

The Si4778DY is currently accessible via B2B platforms, primarily from Shenzhen-based electronic component distributors. Alibaba Alibaba

* Pricing: Market rates for the Si4778DY-T1-GE3 range from $0.28 to $0.79 per unit, depending on order volume and distributor authorization status. Alibaba Alibaba

* Lifecycle Note: Although listed as "Active" in many distributor catalogs, it belongs to an older generation of Vishay products. For new product developments, it is recommended to evaluate modern alternatives with lower $R_{DS(on)}$ or integrated thermal protection. Alibaba

Based on the Si4778DY insights, here are your next steps:

Sources & References

20 sources cited · Verified industry data & reports

SI7476DP-T1-E3 Datasheet

DiGi Electronics

The SI7476DP-T1-E3 is an N-channel MOSFET designed for efficient power switching, load control, and low-loss conduction in compact electronic circuits.

SI4777-A20-GMR - Energy Micro (Silicon Labs) Stock available. ...

Micro-Semiconductor.com

Part Number: SI4777-A20-GMR. Manufacturer/Brand: Energy Micro (Silicon Labs). Product Description: IC RCVR AM/FM CE HD-RADIO TUNER.

AZ23B16-V-G-08 datasheet - Specifications: Arrangement

Digchip

SI4778DY-T1-GE3 : Fet - Single Discrete Semiconductor Product 8A 25V 5W Surface Mount; MOSFET ... Specifications: Category / Application: General Use ; Standards ...

Si8441BB-D-IS datasheet - Silicon Laboratories

Digchip

are high-power density N-Channel Enhancement. Typical applications include switch-mode and resonant-mode power supplies, DC-DC converters and PFC circuits.

Philips Chassis | PDF | Hdmi | Soldering

Scribd

Technical Specs, Diversity, and Connections. Index of this chapter: 2.1 Technical Specifications 2.2 Directions for Use 2.3 Connections 2.4 Chassis Overview.

Manual Servico TV LCD Philips 40pfl9605d 78