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To all our customers
Regarding the change of names mentioned in the document, such as Hitachi
Electric and Hitachi XX, to Renesas Technology Corp.
The semiconductor operations of Mitsubishi Electric and Hitachi were transferred to Renesas
Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog
and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.)
Accordingly, although Hitachi, Hitachi, Ltd., Hitachi Semiconductors, and other Hitachi brand
names are mentioned in the document, these names have in fact all been changed to Renesas
Technology Corp. Thank you for your understanding. Except for our corporate trademark, logo and
corporate statement, no changes whatsoever have been made to the contents of the document, and
these changes do not constitute any alteration to the contents of the document itself.
Renesas Technology Home Page: http://www.renesas.com
Renesas Technology Corp.
Customer Support Dept.
April 1, 2003

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Cautions
Keep safety first in your circuit designs!
1. Renesas Technology Corporation puts the maximum effort into making semiconductor products better
and more reliable, but there is always the possibility that trouble may occur with them. Trouble with
semiconductors may lead to personal injury, fire or property damage.
Remember to give due consideration to safety when making your circuit designs, with appropriate
measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of nonflammable material or
(iii) prevention against any malfunction or mishap.
Notes regarding these materials
1. These materials are intended as a reference to assist our customers in the selection of the Renesas
Technology Corporation product best suited to the customer's application; they do not convey any
license under any intellectual property rights, or any other rights, belonging to Renesas Technology
Corporation or a third party.
2. Renesas Technology Corporation assumes no responsibility for any damage, or infringement of any
third-party's rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or
circuit application examples contained in these materials.
3. All information contained in these materials, including product data, diagrams, charts, programs and
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subject to change by Renesas Technology Corporation without notice due to product improvements or
other reasons. It is therefore recommended that customers contact Renesas Technology Corporation
or an authorized Renesas Technology Corporation product distributor for the latest product information
before purchasing a product listed herein.
The information described here may contain technical inaccuracies or typographical errors.
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rising from these inaccuracies or errors.
Please also pay attention to information published by Renesas Technology Corporation by various
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(http://www.renesas.com).
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information contained herein.
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or system that is used under circumstances in which human life is potentially at stake. Please contact
Renesas Technology Corporation or an authorized Renesas Technology Corporation product distributor
when considering the use of a product contained herein for any specific purposes, such as apparatus or
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2SK1521, 2SK1522
Silicon N-Channel MOS FET
Application
High speed power switching
Features
Low on-resistance
High speed switching
Low drive current
Built-in fast recovery diode (trr = 120 ns)
Suitable for motor control, switching regulator, DC-DC converter
Outline
TO-3PL
ADE-208-1289 (Z)
1st. Edition
Mar. 2001
D
G1
2
3
1. Gate
2. Drain
3. Source
S