KSZ8721BLI-TR

Updated: 2026-08-05

Overview

The KSZ8721BLI-TR is a single-port 10/100 Ethernet physical layer transceiver (PHY) manufactured by Microchip Technology. It is designed to provide reliable Ethernet connectivity for industrial and consumer applications. The device supports both MII (Media Independent Interface) and RMII (Reduced Media Independent Interface) for flexible integration with various microcontrollers and processors. With its compact 32-pin LQFP package, the KSZ8721BLI-TR is ideal for space-constrained designs. It complies with IEEE 802.3 standards, ensuring interoperability with other networking components. The PHY is commonly used in networking switches, routers, IoT gateways, and embedded systems requiring stable Ethernet communication.

Structure and Working Principle

The KSZ8721BLI-TR integrates analog and digital circuitry to transmit and receive Ethernet signals over twisted-pair cables. It includes a physical coding sublayer (PCS), physical medium attachment (PMA), and a media-dependent interface (MDI) for signal conditioning and transmission. The device operates by converting parallel data from the MAC layer into serial data for transmission over the Ethernet cable. It also performs auto-negotiation to determine the optimal link speed (10 Mbps or 100 Mbps) and duplex mode (half or full). Advanced features like energy-efficient Ethernet (EEE) help reduce power consumption during periods of low data activity.

Key Features

The KSZ8721BLI-TR offers several key features that make it suitable for industrial and consumer applications. It supports both MII and RMII interfaces, providing flexibility in system design. The device includes built-in ESD protection, enhancing its robustness in harsh environments. Low power consumption is a standout feature, with advanced power management modes to minimize energy usage. The PHY also supports auto-MDIX, eliminating the need for crossover cables. Compliance with IEEE 802.3 standards ensures reliable performance and interoperability with other networking components.

Application Areas

The KSZ8721BLI-TR is widely used in various networking and embedded applications. It is commonly found in industrial automation systems, where reliable Ethernet connectivity is critical. The device is also used in IoT gateways, smart home devices, and consumer electronics. Embedded systems, such as single-board computers and development kits, often incorporate the KSZ8721BLI-TR for Ethernet communication. Its compact size and low power consumption make it ideal for portable and battery-powered devices. Networking equipment like switches and routers also benefit from its robust performance.

Maintenance and Precautions

Proper handling and installation of the KSZ8721BLI-TR are essential to ensure optimal performance. ESD precautions should be observed during assembly to prevent damage to the sensitive components. The device should be stored in an anti-static bag when not in use. When designing the PCB layout, ensure proper grounding and signal integrity to minimize noise and interference. Follow the manufacturer's guidelines for power supply decoupling and thermal management. Regular firmware updates may be required to maintain compatibility with evolving networking standards.

B2B Procurement Guide

When procuring the KSZ8721BLI-TR in bulk, verify the supplier's authenticity to avoid counterfeit components. Microchip Technology or authorized distributors are recommended sources. Check for compliance with industry standards and request sample units for testing before large-scale purchases. Consider lead times and minimum order quantities (MOQs) when planning procurement. Pricing may vary based on volume, with discounts available for large orders. Ensure the supplier provides adequate technical support and documentation, including datasheets and application notes.