Product category:
Discrete Power Devices
News Release from: Vishay Siliconix | Subject: SiE802DF and SiE800DF
Edited by the Electronicstalk Editorial
Team on 13 December 2005
Novel package cools MOSFETs both ways
The novel PolarPAK package uses double-sided cooling to reduce thermal resistance, package resistance and package inductance for a more efficient, faster-switching power MOSFET.
Vishay Intertechnology is shipping the first two power MOSFETs to be offered in its innovative PolarPAK package, which uses double-sided cooling to reduce thermal resistance, package resistance, and package inductance for a more efficient, faster-switching power MOSFET PolarPAK was specifically designed for easy handling and mounting onto the PCB with high-speed assembly equipment, thus enabling high assembly yields in mass-volume production
This article was originally published on Electronicstalk on 17 Jun 2003 at 8.00am (UK)
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This is one reason why PolarPAK has already earned the distinction of being the first MOSFET package with double-sided cooling to be sourced by multiple manufacturers, beginning with a licence agreement concluded between Vishay and STMicroelectronics in March 2005.
The first PolarPAK power MOSFETs are the 30V N-channel SiE802DF and SiE800DF.
Optimised for the low-side control switch in synchronous rectification DC/DC convertors, the SiE802DF offers exceptionally low on-resistance of 1.9mohm maximum at a 10V gate drive (2.6mohm maximum at 4.5V) and can handle current levels up to 60A.
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The SiE800DF, optimised to work as the low-duty-cycle high-side MOSFET in synchronous DC/DC convertor designs, features a very low typical gate charge of 12nC, with maximum on-resistance of 7.2mohm at 10V and 11.5mohm at 4.5V.
The new PolarPAK power MOSFETs, which have the same footprint dimensions of the standard SO-8, dissipate 1C/W from their top surface and 1C/W from their bottom surface.
This provides a dual heat dissipation path that gives the devices twice the current density of the standard SO-8.
With its improved junction-to-ambient thermal impedance, a PolarPAK power MOSFET can either handle more power or operate with a lower junction temperature.
A lower junction temperature means a lower on-resistance, which in turn means higher efficiency.
A reduction in junction temperature of just 20C can also result in a 2.5x increase in lifetime reliability.
Typical applications for the new PolarPAK devices include voltage regulator modules in notebook and desktop PCs, and other systems requiring high-efficiency DC/DC conversion.
By delivering superior thermal performance and reducing package-related losses, the 5 x 6mm PolarPAK package allows designers to create smaller, more compact circuit designs with a lower component count.
With a height dimension of just 0.8 mm, half the height of the SO-8, the PolarPAK package enables end products that are thinner as well.
Samples and production quantities of the SiE800DF and SiE802DF are available now, with lead times of 10 to 12 weeks for larger orders.
Pricing in 10,000-piece quantities starts at $1.00 per piece for the SiE802DF and $0.80 per piece for the SiE800DF.
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