Apple's newest iPhone features chips from Samsung Electronics, Micron Technology and STMicroelectronics, according to a teardown analysis by tech outfit iFixit.

The iPhone 4 goes on sale on Thursday in five countries and consumers hoping to secure a device are expected to throng stores. But iFixit, which takes apart Apple gadgets to identify components within, said it obtained one of the phones from a Silicon Valley employee who got it in the mail days early.

Samsung supplied flash memory, according to the teardown.

The Micron chip contained in the gadget taken apart on Tuesday was most likely memory, while STMicro, Europe's top chip maker, provided the accelerometer and gyroscope chips used for orienting the phone, iFixit told Reuters.

Early demand for the iPhone 4 has exceeded analysts' expectations. Apple and carrier partner AT&T Inc took pre-orders for 600,000 units in the first day of online pre-sales, underscoring intense demand for the company's slimmer, $199 fourth-generation smartphone.

Apple doesn't disclose who makes the components that go into its smartphones, and suppliers, including Toshiba, Samsung, Infineon and Broadcom in previous versions, keep mum for fear of angering the company.

More than 50 million iPhones have been sold since the device, which revolutionized the smartphone market, debuted in 2007. Wall Street expects the company to sell 8 million to 9 million units in the current quarter, which ends June 26, and as many as 10 million next quarter.

Investors rely on experts such as iFixit and iSuppli to crack open Apple devices to reveal suppliers and component prices. Such news can boost the shares of a component maker, particularly one new to the iPhone.

Shares of Cirrus Logic rose 10 percent on June 17 after the first-day sales blowout. Cirrus supplies chips for virtually all of Apple's gadgets and relies on the company for more than a third of its revenue.

IFixit has garnered a reputation amongst technology afficionados as the speediest of the so-called teardown firms that deconstruct Apple's products.

There can be multiplier suppliers for a particular type of component, experts say. – Reuters