Piper Jaffray published a research note Monday predicting that the iPhone would split into a multi-tiered family of phones and that combined with the release of 3G units will see sales of 45 million in 2009.

Within the 4-page report Senior Jaffray analyst Gene Munster outlines what he believes Apple’s plans are for the iPhone.

“While most investors view our estimate of 45 million iPhones in 2009 as outrageously aggressive, we are maintaining our estimate based on several factors,” Munster wrote. “First, we expect Apple to introduce a 3G iPhone model with additional features in the next 3-6 months. We also expect Apple to offer an entire family of iPhones by January 2009 at the latest including lower priced models that decrease the average selling price (ASP).”

The analyst expects a 3G iPhone to arrive in June followed by an introduction of a new model next year priced between $200 and $300. As such, he expects iPhone ASPs to drop from $489 in 2007 to $365 in 2008 to $314 in 2009.