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TS5A3166-Q1: TS5A3166-Q1 NO or NC?

Part Number: TS5A3166-Q1
Other Parts Discussed in Thread: TS5A3166,

In the process of selecting an analog switch for my application, I found TS5A3166 and TS5A3166-Q1. While most of its descriptions match TS5A3166, on page 3 of the datasheet of TS5A3166-Q1 (The only one I can find on TI website was last revised in December 2014) it's mentioned to be a "Normally Closed" type while TS5A3166 is a Normally Open.

Figure 17 of both datasheets (amongst other ones) point to the NO nature of both parts. 

I'm a bit confused here. Is there a more up to date datasheet available for TS5A3166-Q1? is TS5A3166-Q1 a Normally Open switch? or these two products are totally unrelated?

Kind regards,

Kaveh