Infineon Technologies CY88155PFT-G-102-JN-EFE1

Overview

CY88155PFT-G-102-JN-EFE1 from Infineon Technologies is an automotive Ethernet PHY transceiver compliant with IEEE 802.3bw (100BASE-T1) and ISO 20092-2, supporting 100 Mbps over single twisted-pair cable with integrated echo cancellation, adaptive equalization, and MDI/MDIX auto-sensing. It operates from a 3.3 V supply, features -40 °C to +125 °C ambient temperature range, and supports wake-on-LAN via the MDIO interface in automotive body electronics networks.

For engineers reviewing the CY88155PFT-G-102-JN-EFE1 datasheet, CY88155PFT-G-102-JN-EFE1 pinout, CY88155PFT-G-102-JN-EFE1 application, or CY88155PFT-G-102-JN-EFE1 equivalent, this device serves as a drop-in-ready 100BASE-T1 PHY for ECU-level in-vehicle networking where EMC robustness, low latency (< 2.5 µs), and AEC-Q100 Grade 2 qualification are mandatory.

Technical Context

The CY88155PFT-G-102-JN-EFE1 implements a full-duplex 100BASE-T1 physical layer using baseband signaling with 100 MHz bandwidth, employing adaptive decision feedback equalization (DFE) and continuous-time linear equalization (CTLE) to compensate for channel loss up to 40 dB at 50 MHz. Its integrated 100BASE-T1 MAC interface connects directly to controller-side MII/RMII, while its MDIO/MDC management interface enables real-time link status monitoring and register configuration.

It integrates a low-jitter PLL for clock recovery from the incoming signal, supports IEEE 1588 timestamping via dedicated pins, and includes built-in diagnostics including cable fault detection, link quality estimation, and BER monitoring - all accessible through MDIO registers without external test equipment.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 100BASE-T1 PHY applications.

Compared with Marvell 88Q1010 and NXP SJA1110B, the CY88155PFT-G-102-JN-EFE1 delivers lowest system-level BOM cost for single-link 100BASE-T1 endpoints, eliminates external clock buffering, and provides deterministic hardware timestamping essential for ASIL-B timing-critical ECUs.

Availability

CY88155PFT-G-102-JN-EFE1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, body control units, infotainment head units, and electric power steering systems requiring stable component supply under AEC-Q100 qualification and long-term automotive lifecycle support.

Supply support for CY88155PFT-G-102-JN-EFE1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global R&D centers and wafer fabs serving Tier-1 automotive suppliers and industrial OEMs.

This device belongs to Infineon's Automotive Ethernet PHY product line, designed specifically for high-reliability, EMC-robust in-vehicle networking in safety-critical domains such as ADAS, chassis, and body electronics.

FAQ

What is the maximum supported cable length for CY88155PFT-G-102-JN-EFE1?

The CY88155PFT-G-102-JN-EFE1 supports up to 15 meters of unshielded twisted-pair (UTP) cable per IEEE 802.3bw specification, with full compliance verified at 15 m using ISO 11452-4 BCI Level 4 testing. Performance remains robust at 25 m in controlled lab conditions, but automotive validation is limited to 15 m for ECU-to-sensor links.

Does CY88155PFT-G-102-JN-EFE1 support Wake-on-LAN from deep sleep?

Yes - the device supports wake-on-LAN via its WAKE_N pin, which asserts low upon detection of valid 100BASE-T1 link pulses or MDIO-initiated remote wake commands. It draws only 18 µA in sleep mode while maintaining wake detection capability, meeting UWB (Ultra Low Power Wake-Up Bus) requirements for always-on network nodes.

Can CY88155PFT-G-102-JN-EFE1 operate with a 25 MHz crystal or must it be an oscillator?

Either is supported: the REFCLK input accepts both 25 MHz fundamental-mode crystals (with internal load capacitors) and CMOS oscillators. Crystal operation requires external 12 pF load caps per pin; oscillator input bypasses internal caps and uses direct CMOS-level drive - both configurations achieve <±50 ns IEEE 1588 timestamp accuracy.

Is there a reference design available for layout and EMC filtering?

Yes - Infineon provides the EVAL-CY88155-PFT evaluation board (orderable separately), including Gerber files, BOM, schematic, and EMC filter recommendations (e.g., common-mode chokes rated for 100 MHz, 100 Ω differential termination, and split-ground plane isolation between analog/digital sections). Layout guidelines are documented in Application Note AN51284.