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Old 23rd January 2010, 11:21 AM   #1
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Default SMD component ID

Can anyone ID this part. The dimensions of the body are ~3mm by ~1.55mm. It's likely a dual transistor (possibly with bias resistors).

Thanks in advance.
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Old 23rd January 2010, 05:28 PM   #2
bichi is offline bichi  United States
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Possibly Fairchild NC7SZ00 2-IN NAND Gate?
- see package marking codes (does not indicate "B," however)
Product Folder - NC7SZ00 - TinyLogic UHS 2-Input NAND Gate, Fairchild Semiconductor - Global Leader in Power Optimization

Might be helpful to know what type of equipment it's installed in...
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Old 23rd January 2010, 07:32 PM   #3
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I think you're probably correct. This is in a class D amplifier. Pins 1 and 2 are tied together and driven by an opto-coupler. Pin 3 is on 'ground'. Pin 4 drives the input of a TC4420. Pin 5 is connected to a 5v power supply.

Can you tell me how you found it? I looked through every SMD codebook I could find and searched the manufacturers sites but came up blank. Even searching the Fairchild site for 7z00 or 7zoo doesn't return anything.
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Old 24th January 2010, 08:05 AM   #4
bichi is offline bichi  United States
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Have been designing discrete preamps/LFP filters with SOT-XX stuff, past few years...
- just got lucky this time, I guess.
- but I hear ya, 'tis a nightmare "decoding" SOT device ID's back to manufacturers lately.

Sounds like the right part from your description...

Last edited by bichi; 24th January 2010 at 08:26 AM.
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