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SI9945DY
June 1999
SI9945DY*
Dual N-Channel Enhancement Mode MOSFET
General Description
These N-Channel Enhancement Mode MOSFETs are produced using Fairchild Semiconductor's advance process that has been especially tailored to minimize on-state resistance and yet maintain superior switching performance. These devices are well suited for low voltage and battery powered applications where low in-line power loss and fast switching are required.
Features
3.3 A, 60 V. RDS(ON) = 0.100 @ VGS = 10 V RDS(ON) = 0.200 @ VGS = 4.5 V Low gate charge. Fast switching speed. High power and current handling capability.
Applications Battery switch Load switch Motor controls
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Notes: 1. RJA is the sum of the junction-to-case and case-to-ambient resistance where the case thermal reference is defined as the solder mounting surface of the drain pins. RJC is guaranteed by design while RJA is determined by the user's board design.
a) 78 C/W when mounted on a 0.5 in2 pad of 2 oz. copper.
b) 125 C/W when mounted on a 0.02 in2 pad of 2 oz. copper.
c) 135 C/W when mounted on a 0.003 in2 pad of 2 oz. copper.
Scale 1 : 1 on letter size paper 2. Pulse Test: Pulse Width 300 s, Duty Cycle 2.0%
SI9945DY Rev. A
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks.
ACExTM BottomlessTM CoolFETTM CROSSVOLTTM DOMETM E2CMOSTM EnSignaTM FACTTM FACT Quiet SeriesTM FAST
DISCLAIMER
FASTrTM GlobalOptoisolatorTM GTOTM HiSeCTM ISOPLANARTM MICROWIRETM OPTOLOGICTM OPTOPLANARTM PACMANTM POPTM
PowerTrench QFETTM QSTM QT OptoelectronicsTM Quiet SeriesTM SILENT SWITCHER SMART STARTTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8
SyncFETTM TinyLogicTM UHCTM VCXTM
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.
Rev. G

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