Inside, the phone is similar too, but there have been some strategic changes from one generation to the next that have important implications for Apple’s many suppliers. According to a teardown analysis conducted by the research firm IHS iSuppli, chipmaker Intel, which last year acquired the wireless operations of the German chip concern Infineon, has been almost entirely bounced out of the 4S in favor of a set of chips from Qualcomm. The shift to Qualcomm had been rumored as far back as last September.

Before Intel acquired its wireless unit, Infineon had previously supplied Apple with a chip known as a baseband processor that Apple had used in combination with chips from Skyworks and Triquint to work with wireless phone networks. “Qualcomm is the big winner here,” says Andrew Rassweiler, an analyst with IHS iSuppli who conducted the teardown. “It is selling Apple a whole suite of chips that adds up to about $14 to $15 per iPhone.”

Intel spent $1.4 billion to acquire Infineon’s wireless chip operations last year in a move seen as meant to shore up its presence in the wireless phone industry overall. It has struggled to win business for its Atom line of microprocessors, which are aimed at mobile devices like smartphones and tablets.

Infineon still has a small chip in the iPhone, but Rassweiler says it’s far less significant and a lot less costly than the one it supplied Apple before. “It’s almost like Apple threw them a bone with a 50-cent part after they lost a much more high profile chip that cost about $10,” he says. Intel had no comment.

ISuppli regularly conducts teardown studies of wireless phones and other consumer electronics devices in order to find out who a manufacturer’s vendors are — like most manufacturers, Apple prevents its suppliers from identifying themselves, much as they’d love to — but also to determine what each part costs. The combined cost of components — analysts check on the list prices of each part — is known as a bill-of-materials (BOM) estimate that gives a fair idea how much a manufacturer, in this case Apple, makes in gross margin on each device sold. Apple doesn’t disclose its gross margin on a per-product basis but when it reported its quarterly results yesterday it said its overall gross margin was 40.3 percent.

In the case of the iPhone 4S, Rassweiler estimates that the BOM cost ranges from $188 for the 16 gigabyte version of the iPhone 4S to $207 for the 32GB version and $245 for the 64GB version. Apple and its carrier partners sell the phones for $199, $299 and $399 respectively, typically with a two-year contract for wireless service that carriers use to subsidize the cost they pay Apple.

The costliest components are the ones that determine the price: Memory chips. Apple has been known in the past to rely mostly upon South Korea’s Samsung Electronics, the world’s largest supplier of memory, and from Japan’s Toshiba. In the phone that Rassweiler’s team tore down, the memory chips came from Samsung rival Hynix Semiconductor. “That struck us as a bit of a surprise,” Rassweiler says. It’s hard not to wonder if adding Hynix to the stable of iPhone memory suppliers is a partial response by Apple to the complicated patent fight it is waging with Samsung in courtrooms around the world.

Even so, Samsung appears to be have maintained its role as the manufacturer of the Apple-designed A5 processor that provides the iPhone 4S, and also the iPad 2, with most of its computing horsepower. Some published reports in recent months had suggested that because of the patent fight, Apple might end a relationship that dates back to the original iPhone and move its chip manufacturing contract to Taiwan Semiconductor Manufacturing Co., the huge chip manufacturing foundry. Rassweiler says there’s no sign on the latest A5 chips that that has occurred. “The markings are the same as what we saw in the iPad 2,” he says. The estimated cost for the A5 chip is $15 each, he says.

Apple started designing its own chips for the iPhone and iPad products beginning in 2010 with the release of the first iPad. The chip is thought to have been designed by teams from PA Semi and Intrinsity, two privately held chip design firms that Apple acquired in 2008 and 2010 respectively.

However, it’s also clear that the A5 chip is taking on more of the heavy computing lifting inside the device than the previous A4 chip, Rassweiler says. For example: The iPhone 4 contains a chip from privately held Audience Semiconductor, based in Mountain View, Calif., that handled noise cancellation. There’s no such chip inside the iPhone 4S, Rassweiler says, so it appears that noise-cancellation duties may have been moved to the beefier A5 chip itself.

Triquint Semiconductor provided a set of chips that make up a wireless transmit module that works with the wireless phone networks. Triquint has traditionally been an iPhone supplier, Rassweiler says, but the value of what it supplies to Apple appears to have dropped. One wireless chip company that has seen the value of what it supplies to Apple increase is Avago Technologies. Like Triquint, it too has been an iPhone supplier, but the overall value of the chips it supplies has gone up in the 4S.

STMicroelectronics, the European chipmaker, maintained its role as the supplier of gyroscope chips that help determine the phone’s position and rotate the screen for playing games and displaying pictures and videos. AKM Semiconductor again supplied the compass chip. Texas Instruments continued in its role supplying the chip that controls the iPhone’s display, and an audio chip.

One vendor could not be identified. Rassweiler says that Apple appears to have taken pains to hide the identity of the company that supplies the parts that power the iPhone 4S’s highly regarded 8 megapixel camera. This is not new, and the candidates include Largan Precision Co., a Taiwanese supplier of camera modules to wireless phone companies, and Omnivision. “We don’t know exactly who makes it,” Rassweiler told me. Whoever the supplier is, Rassweiler estimates the camera added $17.60 to the cost to build the iPhone. And they’re likely to make a lot on the deal. IHS iSuppli is forecasting that Apple will sell 81 million iPhone 4Ss around the world next year.

Update: A few of you have written in saying that it was Sony who supplied the camera. Maybe. The folks at Chipworks dissected the camera module and found a Sony-made CMOS image sensor inside it. That doesn’t make the whole module a Sony’s however. It could be a Sony camera or it could be that whoever made the camera used a Sony sensor. And last week Barron’s reported on some debate among analysts over whether or not Apple has split the camera supply contract 50-50 between Omnivision and Sony.

But the most intriguing part of Berger’s note is his report that Asian sources indicate a compound called “Bismaleimide Triazine Resin,” which is used in the packaging of many chips, could be constrained given that most of the supply comes from Japan’s Mitsubishi Gas Chemical. A shortage of BT resin would hurt Xilinx, which is “50 percent exposed,” he writes, Altera, which has 40 percent exposure, and Qualcomm which has 30 percent exposure.

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Ho doesn’t formally cover SanDisk: he’s more interested in the implications for some of his coverage companies, including Teradyne (TER) and Verigy (VRGY), both of which he rates “Buy.” Those two companies make chip test equipment.

“We believe the company (and the overall NAND flash market) has seen a pickup in handset demand, as well as continued strength in many Apple-based products (including the iPhone 3G S),” writes Ho.

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Mok writes in a research note that the downgrade reflects “early signs of weakness in the NAND flash memory sector that we believe will lead to lower prices.” He contends checks find that NAND product inventories have increased substantially, and that demand in both the retail and OEM channel has slowed since May. Heading into the second half, he writes, “we are concerned that production ramps”–Mok expects higher output from both Samsung and Toshiba–“will swing the NAND sector into oversupply.”

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In October, Samsung withdrew a $26-a-share bid for SanDisk; there was speculation before Samsung pulled its offer that Toshiba might serve as a white knight for SanDisk.

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In fact, as Bloomberg reports, Toshiba today cut its full-year net income forecast for the March 31, 2009, fiscal year by 46 percent to 70 billion yen, which would be a four-year low. The company also cut its sales projection by 3.8 percent to 7.7 trillion yen, and its operating profit forecast by 48 percent to 105 billion yen.

Toshiba is the world’s second-largest producer of NAND flash memory chips. The company said its semiconductor division will lose 65 billion yen for the year due to weak NAND pricing.

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