Chip suppliers are looking to enter production starting mid-June for the upcoming new iPhone series slated for launch in September 2016, but are generally less optimistic on their unit production for the devices by the end of the year.

About 75 million units of the upcoming iPhone will be produced in 2016, according to an estimate by sources from chipmakers in the iPhone supply chain. The estimate is lower than the unit production for the iPhone 6 and 6 Plus devices in 2014.

Chip suppliers for the upcoming iPhone include Intel and Qualcomm for modem chips, Dialog Semiconductor for power management ICs, NXP Semiconductors for NFC chips and Broadcom for wireless solutions, according to the sources.

Apple's new A10 processor that will power the upcoming iPhone will be fabricated on TSMC's 16nm FinFET process, said the sources.