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What is this component?

Can someone link me to an equivalent replacement, haven't been able to find anything

D5SV17

D5SV17

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    \$\begingroup\$ Sometimes SMT parts are hard to track down by what's printed on them alone, it might be worth adding a few details on what it's from and if you have thoughts on what it might be based on the location and what it connects to. \$\endgroup\$
    – PeterJ
    Jan 20, 2015 at 9:39
  • \$\begingroup\$ it appears to be being used as a three-terminal device (4pins are connected to the large plane) \$\endgroup\$ Jan 20, 2015 at 11:58
  • \$\begingroup\$ might be a dual transistor, might be a voltage reference. \$\endgroup\$ Jan 20, 2015 at 12:01

3 Answers 3

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The massive planes and the small tap off of the gate suggest a switching power supply design, so I assumed a power MOSFET. The Q on the silkscreen is another telling sign. This marking chart looks much the same, note the line over the year and week.

enter image description here

In addition this pinout looks about right to the usage. The only confusion is the capacitor between gate and source. A little bit of context might help that. Hope this helps.

enter image description here

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if forced to guess i'd say it's probably a dual transistor with only one half being used. there;s no other way I can explain its use as a 3 terminal device and the capacitor across pins 3 and 4, also Q in the silkscreen suggests a transistor

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  • \$\begingroup\$ It is from a laptop. Photo taken from working board. The broken board its completely blown. I'll replace with a 6 pin MOSFET and see how I go \$\endgroup\$
    – muta
    Jan 21, 2015 at 11:35
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Possible candidate with a D5 suffix:

Rohm General Purpose (dual digital transistors)

http://www.s-manuals.com/pdf/datasheet/e/m/emd5%2C_umd5n_rohm.pdf

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