Content last revised on February 26, 2026
SI6925ADQ-T1-GE3 Vishay Siliconix 30V Dual N-Channel TrenchFET MOSFET
How can engineers effectively minimize conduction losses and heat dissipation in ultra-slim portable electronics without sacrificing PCB real estate? The SI6925ADQ-T1-GE3 provides a technical answer through its advanced TrenchFET architecture integrated into a compact TSSOP-8 package.
The Vishay Siliconix SI6925ADQ-T1-GE3 is a high-performance Dual N-Channel 30-V (D-S) MOSFET designed for high-density power switching. By integrating two independent MOSFETs into a single TSSOP-8 footprint, it enables designers to optimize board space in mobile and notebook applications while maintaining a low RDS(on). For logic-level gate drive systems prioritizing thermal efficiency in constrained environments, this 30V dual module is the optimal choice.
Top Specifications: 30V | 4.0A | RDS(on) 0.030 Ω @ 10V
- Space Optimization: Dual MOSFET configuration in a single TSSOP-8 package reduces component count.
- Enhanced Efficiency: Low RDS(on) minimizes power loss during high-frequency load switching.
Frequently Asked Questions
Addressing Core Engineering Challenges in Low-Voltage Designs
How does the SI6925ADQ-T1-GE3 specifically address the challenge of battery life in portable devices?
The primary benefit lies in its low RDS(on) (typically 30 mΩ at 10V), which directly reduces conduction losses. By minimizing the energy wasted as heat during the "on" state, the module ensures that more battery power reaches the load, extending the runtime of handheld electronics and notebooks.
What is the primary benefit of the SI6925ADQ-T1-GE3 dual-channel configuration for load switching?
Enhanced system reliability through thermal symmetry. Integrating two channels on one substrate allows for more uniform heat distribution across the TSSOP-8 package, preventing localized "hot spots" that can lead to premature component fatigue in notebook load switches.
Can this MOSFET be driven directly by 5V logic circuits?
Yes. The SI6925ADQ-T1-GE3 is optimized for logic-level performance, with a maximum Gate-Threshold Voltage (VGS(th)) of 3.0V. This allows for efficient switching directly from standard 5V logic controllers without the need for additional level-shifting components.
How does the Junction-to-Ambient thermal resistance impact the PCB layout?
With a Maximum Junction-to-Ambient (RthJA) of 125 °C/W (on a standard FR4 board), designers must ensure adequate copper pour. Understanding this parameter is critical for determining the maximum allowable current before reaching the 150 °C operating junction temperature limit.
Key Parameter Overview
Decoding the Specs for Enhanced Thermal Reliability
| Technical Parameter | Value / Rating | Engineering Significance |
|---|---|---|
| Drain-Source Voltage (VDS) | 30 V | Provides safe overhead for 12V and 19V notebook rail applications. |
| Continuous Drain Current (ID) | 4.0 A (at 25 °C) | Supports steady-state power delivery for peripheral load management. |
| On-Resistance (RDS(on)) @ 10V | 0.030 Ω | Reduces I²R losses, critical for maintaining high system efficiency. |
| Maximum Power Dissipation (PD) | 1.0 W (at 25 °C) | Dictates the thermal boundary for continuous operation in TSSOP-8. |
| Gate-Source Voltage (VGS) | ± 20 V | Ensures robust gate oxide protection against voltage transients. |
Technical Deep Dive
Optimizing Switching Efficiency through TrenchFET Technology
The SI6925ADQ-T1-GE3 utilizes Vishay's proprietary TrenchFET technology. In traditional planar MOSFETs, the current flows horizontally across the surface; however, TrenchFET structures utilize vertical gates "trenched" into the silicon. This increases the cell density significantly, which is the primary driver for achieving a remarkably low RDS(on) within a small footprint.
To understand the importance of Thermal Resistance (RthJA) in this package, consider an analogy: Thermal Resistance is like a narrow pipe through which heat must flow. The SI6925ADQ-T1-GE3's TSSOP-8 package acts as the pipe. If the "water" (heat) generated by the 4.0A current is too voluminous for the pipe diameter, the system overflows (overheats). Therefore, proper PCB heat sinking is essential to "widen the pipe" and maintain the device within its Safe Operating Area.
For systems requiring significantly higher current handling or different topologies, the FF400R12KE3 or the SKM300GB128D offer higher voltage and current ratings for industrial-scale power conversion.
Application Scenarios & Value
Achieving System-Level Benefits in High-Frequency Power Conversion
In notebook computer power architectures, the SI6925ADQ-T1-GE3 is frequently deployed as a load switch for USB ports or display backlights. Engineers often face the challenge of voltage drops across switching elements, which can disrupt sensitive logic-level peripherals. By utilizing the 0.030 Ω RDS(on) of this MOSFET, the voltage drop is kept negligible, ensuring stable power delivery even under maximum current draws.
Beyond mobile computing, this module serves as a critical component in Li-ion battery protection circuits and low-voltage DC-DC converters. In battery-managed handheld devices, the dual-channel nature allows for bidirectional current control (charge/discharge) in a single component, satisfying the strict IEC 62133 safety standards for thermal management in portable products. For those designing HMI interfaces, understanding industrial display engineering can provide broader context on how such power components support backlight and logic stability.
For designers scaling up to high-power industrial drives, the CM600DX-24T provides the necessary ruggedness for heavy-duty motor control, contrasting with the SI6925ADQ-T1-GE3's focus on low-power precision.
The Vishay SI6925ADQ-T1-GE3 remains a staple for procurement and engineering teams focused on efficiency-first designs. Its balance of 30V breakdown voltage and dual-channel integration makes it a versatile tool for modern power management. To ensure long-term reliability, engineers should consult the Field Engineers Handbook for best practices in thermal verification and failure analysis.