Vishay Siliconix SIHB125N65E-GE3

Overview

SIHB125N65E-GE3 from Vishay Siliconix is a 650 V, 27 A N-channel enhancement-mode Power MOSFET in D2PAK (TO-263) package, featuring R_DS(on) = 0.106 Ω at V_GS = 10 V, Q_g = 38 nC (typ), and Kelvin-source connection for reduced gate noise-designed for high-efficiency, high-frequency switching in telecom power supplies and PFC stages.

For engineers reviewing the SIHB125N65E-GE3 datasheet, SIHB125N65E-GE3 pinout, SIHB125N65E-GE3 application, or SIHB125N65E-GE3 equivalent, key selection criteria include its 650 V blocking rating, low FOM (R_DS(on) × Q_g), avalanche-rated UIS capability, and optimized Co(er) = 81 pF for reduced switching loss in hard-switched SMPS topologies.

Technical Context

This E-series MOSFET employs 4th-generation superjunction technology with a Kelvin-source configuration that separates power and signal source terminals to minimize common-source inductance and suppress gate oscillation during fast dV/dt transitions. Its low effective output capacitance (Co(er) = 81 pF) and reduced Q_gd/Q_g ratio (14/38 nC) support clean turn-off and reduced Miller-induced shoot-through risk.

The device is rated for repetitive unclamped inductive switching (UIS) up to 81 mJ and supports continuous operation at T_C = 100 °C with I_D = 17 A, leveraging R_thJC = 0.6 °C/W for efficient heat transfer to the PCB copper pour or heatsink. Its V_GS(th) range of 3.0–5.0 V ensures robust gate drive margin in 12 V systems.

Key Specifications

Pinout & Package

D2PAK (TO-263) package with exposed drain tab on underside for thermal and electrical connection; 3-pin surface-mount outline conforming to JEDEC MO-211 (D2PAK-3L). Requires minimum 0.420″ × 0.355″ (10.67 mm × 9.02 mm) copper pad with thermal vias for optimal R_thJA.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage power switching applications.

Compared with STW65N65M5 and IXTH120N65X2, SIHB125N65E-GE3 offers the best balance of low Q_g, Kelvin-source noise immunity, and D2PAK manufacturability-making it optimal for high-frequency, space-constrained telecom and server power designs where gate drive simplicity and EMI control are critical.

Availability

SIHB125N65E-GE3 is available at Aetrix Electronics and suitable for server and telecom power supplies, solar PV inverters, and industrial motor drives requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SIHB125N65E-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 high-reliability, high-efficiency power solutions.

The E Series Power MOSFET product line targets high-frequency, high-efficiency switching applications-including PFC, LLC, and isolated DC/DC converters-where low FOM, avalanche ruggedness, and thermal performance are essential.

FAQ

What is the maximum continuous drain current rating for SIHB125N65E-GE3 at 100 °C case temperature?

The SIHB125N65E-GE3 has a continuous drain current rating of 17 A at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This value assumes proper PCB thermal design with full-surface drain pad soldering and adequate copper area. At T_C = 25 °C, the rating increases to 27 A. Derating follows a linear factor of 1.67 W/°C above 25 °C case temperature.

Does SIHB125N65E-GE3 feature a Kelvin-source connection, and how does it affect layout?

Yes, SIHB125N65E-GE3 implements Kelvin-source topology-though implemented via internal routing rather than a dedicated 4th pin. The gate and source signal paths are physically separated from the high-current source return path, minimizing common-source inductance. Layout must maintain tight coupling between gate driver ground and the signal-source pin while keeping high-current source traces away from the gate loop to preserve noise immunity.

What is the typical total gate charge (Q_g) of SIHB125N65E-GE3, and why is it important for gate driver selection?

The typical total gate charge (Q_g) of SIHB125N65E-GE3 is 38 nC at V_GS = 10 V, with a maximum of 57 nC. This parameter determines the peak gate current required to achieve a target switching speed-for example, achieving 50 ns rise time demands ~1.1 A peak drive. Selecting a gate driver with sufficient current capability and low output impedance prevents gate waveform distortion and ensures reliable turn-on/turn-off timing in high-frequency SMPS.

Can SIHB125N65E-GE3 be used in avalanche mode, and what is its rated single-pulse energy?

Yes, SIHB125N65E-GE3 is fully rated for repetitive unclamped inductive switching (UIS) with a single-pulse avalanche energy (E_AS) of 81 mJ under test conditions of V_DD = 140 V, L = 28.2 mH, R_g = 25 Ω, and I_AS = 2.4 A. This ruggedness enables use in flyback, forward, and resonant converters where inductive energy must be safely absorbed without external protection circuitry.

What thermal resistance values apply to SIHB125N65E-GE3, and how do they impact heatsink design?

SIHB125N65E-GE3 has a maximum junction-to-case thermal resistance (R_thJC) of 0.6 °C/W and a maximum junction-to-ambient (R_thJA) of 62 °C/W. For high-power operation, the low R_thJC means thermal performance depends almost entirely on the heatsink and interface (e.g., thermal paste, pad). With a 10 °C/W heatsink and 0.5 °C/W interface, total R_thJA ≈ 11.1 °C/W, allowing ~150 W dissipation at ΔT = 165 °C (150 °C T_J − 25 °C ambient).