Vishay Siliconix SI4925DDY-T1-GE3

Overview

SI4925DDY-T1-GE3 from Vishay Siliconix is a dual P-channel enhancement-mode MOSFET in SO-8 package, rated for -30 V drain-source voltage, 0.029 Ω R_DS(on) at -10 V V_GS, and -8 A continuous drain current at T_C = 25 °C. It serves as a compact, high-efficiency load switch in portable computing power rails.

For engineers reviewing the SI4925DDY-T1-GE3 datasheet, SI4925DDY-T1-GE3 pinout, SI4925DDY-T1-GE3 application, or SI4925DDY-T1-GE3 equivalent, key selection criteria include its dual P-channel topology, -30 V rating, low gate charge (15 nC at -4.5 V), halogen-free RoHS-compliant construction, and SO-8 thermal performance under pulsed and steady-state conditions.

Technical Context

This device integrates two independent P-channel TrenchFET® MOSFETs in a single SO-8 package, sharing no internal connection between channels. Each channel supports full -30 V V_DS blocking and operates with gate threshold voltage ranging from -1.0 V to -3.0 V, enabling direct logic-level control from 3.3 V or 5 V microcontrollers when used with appropriate level-shifting or gate drive configuration.

Its dynamic parameters-including 1350 pF input capacitance, 7.5 nC gate-drain charge, and 34–60 ns body diode reverse recovery time-are optimized for synchronous buck converter high-side switching and bidirectional load switching where fast turn-off and controlled dv/dt are critical.

Key Specifications

Pinout & Package

SO-8 (JEDEC MS-012) surface-mount package with exposed thermal pad (footprint per Vishay AN826); 1.27 mm pitch, 4.9 mm × 3.9 mm body, 1.75 mm max height. Thermal resistance junction-to-foot (R_thJF) is 20 °C/W typical, enabling direct PCB copper pour cooling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual P-channel MOSFET applications.

Compared with IRF7317PBF and DMC3025LSD-13, the SI4925DDY-T1-GE3 delivers optimal balance of dual-channel integration, SO-8 thermal performance, and 15 nC gate charge-making it preferred for space-constrained notebook and game console power management where layout efficiency and switching speed are critical.

Availability

SI4925DDY-T1-GE3 is available at Aetrix Electronics and suitable for notebook PCs, desktop VRMs, game console power systems, and industrial I/O modules requiring stable component supply and lead-free/halogen-free compliance.

Supply support for SI4925DDY-T1-GE3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Siliconix is a global leader in discrete semiconductors, specializing in MOSFETs, diodes, optoelectronics, and passive components with emphasis on power efficiency and ruggedness.

The Si4925DDY product line targets high-density power management in portable and embedded systems, delivering dual-channel P-MOSFET integration with industry-leading R_DS(on)-to-footprint ratio for battery-powered applications.

FAQ

What is the maximum continuous drain current rating for SI4925DDY-T1-GE3 at 70 °C case temperature?

The SI4925DDY-T1-GE3 supports -8.0 A continuous drain current at T_C = 70 °C, as specified in the Absolute Maximum Ratings table. This rating is limited by package thermal resistance-not silicon capability-and assumes proper PCB copper pour and thermal vias under the exposed foot (Pins 7–8). Derating begins above 70 °C per the published current derating curve.

Does SI4925DDY-T1-GE3 support logic-level gate drive from a 3.3 V microcontroller?

Yes, the SI4925DDY-T1-GE3 has a gate threshold voltage (V_GS(th)) range of -1.0 V to -3.0 V, and its R_DS(on) is specified down to -4.5 V V_GS (0.041 Ω). When driven from a 3.3 V source referenced to its source, the effective V_GS is -3.3 V-within specification and sufficient for low-loss switching in most load-switch applications. For guaranteed -8 A conduction, -4.5 V or greater is recommended.

What is the thermal resistance junction-to-foot (R_thJF) for SI4925DDY-T1-GE3, and how should it be used in thermal design?

The SI4925DDY-T1-GE3 has a typical R_thJF of 20 °C/W and maximum of 25 °C/W. This parameter reflects heat flow from junction to the exposed thermal pad (Pins 7–8), not ambient. In thermal design, R_thJF must be combined with PCB thermal resistance (e.g., 15–30 °C/W for 1-in² 2-oz copper) to estimate total junction-to-ambient resistance. The SI4925DDY-T1-GE3 datasheet provides derating curves based on this path.

Is SI4925DDY-T1-GE3 suitable for use in back-to-back configuration for AC or bidirectional DC blocking?

Yes, the SI4925DDY-T1-GE3 is commonly used in back-to-back P-channel configuration-using both channels-to provide bidirectional blocking in battery protection circuits. Its -30 V V_DS rating and matched channel characteristics ensure symmetrical clamping and low leakage (<1 µA IDSS). The body diodes are oriented to block current in both directions when gates are biased appropriately.

What does "T1-GE3" signify in the full part number SI4925DDY-T1-GE3?

The "T1" denotes tape-and-reel packaging (1000 pieces per reel), and "GE3" indicates Vishay's green, lead-free, and halogen-free compliance designation per J-STD-609. This suffix confirms the SI4925DDY-T1-GE3 meets RoHS Directive 2011/65/EU and IEC 61249-2-21 standards, with no lead, brominated flame retardants, or chlorine-based additives in the package or plating.