RT55237S Card Reader Controller IC

The Realtek RTS5237S / RT55237S IC is a high-speed USB 3.0 multi-card reader controller designed for efficient data transfer between flash memory cards and host systems. It supports a wide range of card formats including SD, SDHC, SDXC, MMC, and Memory Stick (MS), ensuring fast and reliable read/write operations. Featuring USB 3.0 SuperSpeed interface, the controller achieves up to 5 Gbps transfer rates while maintaining backward compatibility with USB 2.0. The RTS5237S integrates power management, card detection, and over-current protection, reducing external components. Packaged in a QFN-32 form factor and marked 5237S / S5237S, it is ideal for laptops, PCs, and external card readers.

Technical Summary:

• Model: RTS5237S / RT55237S
• Manufacturer: Realtek
• Type: USB 3.0 Multi-Card Reader Controller IC
• Supported Cards: SD, SDHC, SDXC, MMC, MS
• Interface: USB 3.0 (backward compatible with USB 2.0)
• Features: Power management, over-current protection, card detection
• Marking Code: 5237S / S5237S
• Package: QFN-32
• Applications: Laptops, notebooks, external card readers, embedded systems