ST802RT1BFR

Drivers, Receivers, Transceivers Overview

The ST802RT1BFR is a high-performance fast Ethernet physical layer transceiver manufactured by STMicroelectronics. It supports IEEE 802.3 10Base-T and 100Base-TX standards, with the B variant additionally supporting 100Base-FX fiber optic interfaces. The device operates from a single 3.3 V supply and provides full-duplex operation at both 10 Mbps and 100 Mbps speeds. Key technical specifications include an optimized deterministic latency for real-time Ethernet applications, auto-negotiation capabilities, and automatic MDI/MDIX crossover detection. The component integrates MII and RMII interfaces for connection to media access controllers and features programmable LED outputs for status signaling. It is housed in a 48-pin LQFP package measuring 7 x 7 mm and is rated for an extended operating temperature range of -40 °C to +105 °C.

Drivers, Receivers, Transceivers Feature Summary

• Supports 100Base-FX fiber optic transmission in addition to standard copper twisted-pair Ethernet protocols
• Integrates automatic MDI/MDIX functionality to eliminate the need for crossover cables
• Provides deterministic latency optimization suitable for real-time industrial Ethernet networks
• Includes configurable LED pins for displaying link status, speed, and activity

Drivers, Receivers, Transceivers Applications

• Industrial control systems requiring reliable Ethernet connectivity
• Factory automation equipment and PLCs
• High-end computer peripherals
• Building automation infrastructure
• Telecom network equipment

Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific part number suffix 'B' corresponds to the required 100Base-FX fiber optic capability, as the 'A' variant lacks this feature. Confirm the 'FR' suffix indicates the correct tape-and-reel packaging format if automated assembly is planned. Ensure the design accommodates the 48-pin LQFP footprint dimensions and thermal requirements specified in the mechanical data section of the datasheet.

Drivers, Receivers, Transceivers Selection Notes

Select the ST802RT1BFR over the ST802RT1AFR only if the application requires 100Base-FX fiber optic connectivity. Both variants share identical copper Ethernet (10Base-T/100Base-TX) performance and pinouts. Designers must account for the external transformer requirements, specifically the 1.414:1 turn ratio on the transmit and receive sides. Verify that the host MAC controller supports either MII or RMII interface modes via the appropriate strap configurations.

Drivers, Receivers, Transceivers Part Context

The ST802RT1x series serves as a PHY solution for Fast Ethernet applications within the STMicroelectronics portfolio. The ST802RT1BFR represents the fiber-optic enabled version of this family, distinguishing itself from the copper-only ST802RT1AFR through the inclusion of PECL transmitter and receiver circuits necessary for optical module interfacing. This differentiation allows system architects to choose between copper and fiber media based on environmental noise immunity and distance requirements without changing the core logic interface.

Drivers, Receivers, Transceivers Replacement Considerations

The ST802RT1AFR is a direct functional substitute for copper-only applications where fiber connectivity is not needed. No other cross-model replacements are documented in the provided source material.