Vishay Siliconix SI4833BDY-T1-GE3

Overview

SI4833BDY-T1-GE3 from Vishay Siliconix is a P-channel 30 V (D-S) MOSFET integrated with a co-packaged Schottky diode in an SO-8 package, delivering R_DS(on) = 0.068 Ω at V_GS = −10 V and 0.110 Ω at V_GS = −4.5 V, with continuous drain current up to −4.6 A at T_C = 25 °C - used for battery management and non-synchronous buck conversion in notebook PCs and HDDs.

For engineers reviewing the SI4833BDY-T1-GE3 datasheet, SI4833BDY-T1-GE3 pinout, SI4833BDY-T1-GE3 application, or SI4833BDY-T1-GE3 equivalent, this device offers verified thermal resistance (R_thJA = 60 °C/W typ.), integrated body diode recovery (t_rr = 12–24 ns), and lead-free/halogen-free compliance per IEC 61249-2-21 and RoHS Directive 2002/95/EC.

Technical Context

This MOSFET operates as a high-side switch in DC-DC power stages, leveraging its negative gate threshold (V_GS(th) = −1.0 to −2.5 V) and low gate charge (Q_g = 4.6–14 nC) for efficient switching control in low-voltage, high-current paths. Its integrated Schottky diode provides forward voltage of 0.44 V at 1 A and reverse leakage < 0.2 mA at 30 V and 25 °C.

The device uses LITTLE FOOT® Plus packaging for enhanced thermal performance on FR4 PCBs, with maximum junction temperature rated at 150 °C and junction-to-foot thermal resistance (R_thJF) of 35 °C/W typical - enabling stable operation under pulsed loads up to −20 A (t = 300 µs).

Key Specifications

Pinout & Package

SO-8 narrow-body package (JEDEC MS-012), surface-mount, lead (Pb)-free and halogen-free. Dimensions: 4.9 mm × 3.9 mm × 1.55 mm (max height). Footprint matches standard SOIC-8 land pattern per Application Note 826.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI4833BDY-T1-GE3, Si7157DP-T1-GE3 trades voltage headroom for lower conduction loss at 3.3 V drive, while IRF7606TRPBF increases BOM count and switching loss due to missing Schottky and higher Q_g.

Availability

SI4833BDY-T1-GE3 is available at Aetrix Electronics and suitable for notebook PC battery management, HDD non-synchronous buck converters, and peripheral load switching requiring stable component supply, RoHS/halogen-free compliance, and proven thermal performance on FR4 PCBs.

Supply support for SI4833BDY-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 designs and manufactures discrete semiconductors including MOSFETs, diodes, and optoelectronics, with emphasis on power efficiency, reliability, and miniaturization for industrial and computing applications.

The SI4833BDY-T1-GE3 belongs to Vishay's LITTLE FOOT® Plus MOSFET family, engineered specifically for space-constrained, thermally demanding DC-DC power stages where integrated Schottky functionality reduces footprint and improves light-load efficiency.

FAQ

What is the maximum continuous drain current for SI4833BDY-T1-GE3 at 70 °C case temperature?

The maximum continuous drain current for SI4833BDY-T1-GE3 is −3.6 A at T_C = 70 °C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limitations of the SO-8 package under sustained power dissipation; designers must verify board layout and copper area to maintain safe junction temperature below 150 °C. SI4833BDY-T1-GE3 maintains stable R_DS(on) performance across this range due to its normalized on-resistance curve.

Does SI4833BDY-T1-GE3 include a body diode in addition to the integrated Schottky diode?

Yes, SI4833BDY-T1-GE3 retains the intrinsic MOSFET body diode between source and drain, but its primary freewheeling path uses the co-packaged Schottky diode (anode at pin 4, cathode at pin 3), which has lower V_F and faster t_rr. The body diode remains active during reverse conduction events not covered by the Schottky, such as reverse-bias conditions exceeding −30 V. SI4833BDY-T1-GE3 datasheet specifies both V_SD = −0.83 to −1.2 V and V_F = 0.44 V separately.

Can SI4833BDY-T1-GE3 be used with 3.3 V gate drive in high-side configuration?

Yes, SI4833BDY-T1-GE3 is fully specified down to V_GS = −4.5 V, with R_DS(on) = 0.110 Ω and I_D = −3.4 A under those conditions. At 3.3 V gate drive (i.e., V_GS ≈ −3.3 V), it remains functional but exhibits higher on-resistance (~0.13 Ω estimated from R_DS(on) vs. V_GS curves); designers should confirm voltage margin and thermal rise. SI4833BDY-T1-GE3's −1.8 V typical V_GS(th) ensures reliable turn-on with 3.3 V logic.

What is the thermal resistance from junction to foot (R_thJF) for SI4833BDY-T1-GE3, and why does it matter?

SI4833BDY-T1-GE3 has a typical junction-to-foot thermal resistance (R_thJF) of 35 °C/W, measured from die to exposed drain pad (pins 5–8). This parameter matters because it directly governs how efficiently heat transfers from the silicon to the PCB copper pour beneath the package - critical for high-pulsed-current applications like hot-swap or load switching. Lower R_thJF enables higher peak currents without exceeding T_J(max) = 150 °C. SI4833BDY-T1-GE3 leverages LITTLE FOOT® Plus construction to achieve this value.

Is SI4833BDY-T1-GE3 suitable for automotive applications?

No, SI4833BDY-T1-GE3 is not qualified for automotive applications. It lacks AEC-Q101 stress testing, has no guaranteed operation above 125 °C junction temperature, and is specified only for commercial/industrial temperature ranges (−55 to +150 °C). While its parameters may function in some automotive subsystems, Vishay does not endorse or warrant SI4833BDY-T1-GE3 for safety-critical or engine-bay environments. Automotive-grade alternatives require explicit AEC-Q101 certification and extended temperature validation.