The Nintendo 3DS has custom components codeveloped by the Nintendo Research & Engineering department and other manufacturers, all combined into a unified system on chip. Its main central processing unit (CPU) is a dual-core ARM11 MPCore-based processor manufactured at 45 nm and clocked at 266 MHz. One processor core is dedicated to games and applications, while the other core is exclusive to the operating system, enabling multitasking and background tasks. These tasks are handled seamlessly in the background during gameplay or while the system is in sleep mode. The system also contains a single-core ARM9-based processor, enabling backward compatibility with both Nintendo DS and DSi titles. The graphics processor (GPU) is a PICA200 developed by Digital Media Professionals, running at 133 MHz. The system contains 128 MB of random-access memory (RAM) consisting of 128 MB of FCRAM developed by Fujitsu, with a peak bandwidth of 3.2 GB/s.
The console contains two separate screens. The top screen is a 15:9 (5:3) autostereoscopic liquid-crystal display (LCD) with a resolution of 800×240 pixels (effectively 400×240 pixels per eye, or WQVGA). On the original 3DS, the screen measures 3.53 in (90 mm), while on the 3DS XL it measures 4.88 in (124 mm). It is autostereoscopic; it uses a parallax barrier to produce a three-dimensional effect without requiring special glasses. There is a 3D Depth Slider next to the screen for adjusting the 3D effect or turning it off altogether. The bottom screen is a 4:3 resistive touchscreen with a display resolution of 320×240 pixels (QVGA). On the original Nintendo 3DS, the screen measures 77 mm (3.02 in), while on the 3DS XL it measures 106 mm (4.18 in).
The system features three camera sensors: two cameras on the outside of the device, capable of taking 3D photos and capturing 3D video; and one camera facing the user positioned above the top screen. All camera sensors have a maximum resolution of 640×480 pixels (0.3 megapixels, VGA) with one-point focus and can only achieve digital zoom. There is also a microphone in the bottom of the system.
The system includes 2 GB of eMMC flash memory manufactured by either Toshiba or Samsung. The system's memory can be expanded via an SD memory card slot, which supports SD and SDHC memory cards. All Nintendo 3DS systems come packaged with a 2 GB SD card while Nintendo 3DS XL systems include a 4 GB SDHC card. The system uses 2.4 GHz 802.11 b/g wireless network connectivity with enhanced WPA2 security. There is also an infrared port on the back of the console, which allows the system to connect with certain peripherals such as the Circle Pad Pro and the amiibo reader/writer.
The Nintendo 3DS comes with a 3.7 V 1300 mAh 5 Wh lithium ion battery. Its longevity fluctuates between 3 and 5 hours while playing Nintendo 3DS games and between 5 and 8 hours while playing Nintendo DS games, depending on brightness, volume and wireless settings. The Nintendo 3DS XL however, comes with a 1750 mAh, 3.7 V lithium-ion battery capable of lasting between 3.5 and 6.5 hours playing 3DS games and 6 to 10 hours playing DS games. While the original 3DS weighs approximately 230 grams (8.1 oz), the larger XL version weighs approximately 336 grams (11.9 oz). When opened, the original 3DS is 134 mm (5.3 in) wide, 74 mm (2.9 in) broad, and 21 mm (0.83 in) thick. The XL version however, is 156 mm (6.1 in) wide, 93 mm (3.7 in) broad, and 22 mm (0.87 in) thick. The 3DS also come with a telescoping stylus, extendable to up to 100 mm (3.9 in) long, while the 3DS XL come with a regular 93 mm (3.7 in) stylus.
All systems in the Nintendo 3DS family use the same AC adapter used with the Nintendo DSi and Nintendo DSi XL. In order to reduce production costs, certain console bundles, such as Japanese and European releases of the Nintendo 3DS XL and the New Nintendo 3DS, are not bundled with an AC adapter, requiring players to either use one from an older system they may own or purchase one separately. Along with plugging the adapter directly into the system, the standard Nintendo 3DS comes with a charging cradle, which players place their system in to charge. Charging cradles for the Nintendo 3DS XL and New Nintendo 3DS systems are sold separately from their respective systems, and there is no cradle for the Nintendo 2DS.
