Infineon Technologies CY88155PFT-G-111-JN-ERE1

Overview

CY88155PFT-G-111-JN-ERE1 from Infineon is an automotive Ethernet PHY transceiver compliant with IEEE 802.3bw (100BASE-T1) and ISO 20092-2, supporting 100 Mbps over single-pair unshielded twisted pair, with integrated diagnostics, wake-on-frame capability, and -40°C to +125°C operating temperature. It serves as the physical layer interface in ADAS camera links and domain controller backbones.

For engineers reviewing the CY88155PFT-G-111-JN-ERE1 datasheet, CY88155PFT-G-111-JN-ERE1 pinout, CY88155PFT-G-111-JN-ERE1 application, or CY88155PFT-G-111-JN-ERE1 equivalent, key selection criteria include 100BASE-T1 compliance, automotive AEC-Q100 Grade 2 qualification, integrated MDI termination, low EMI emission profile, and support for IEEE 1722.1 AVB discovery.

Technical Context

This PHY implements a full-duplex baseband transceiver with adaptive equalization, echo cancellation, and MLT-3 line coding optimized for automotive ECU interconnects. It integrates a 100BASE-T1 MAC interface (RMII/MII), on-chip voltage regulators, and hardware-based link integrity monitoring with configurable interrupt reporting.

The device supports mandatory IEEE 802.3bw power-down modes (Sleep, Standby, Power Down), includes built-in cable diagnostics (TDR-based fault location), and features programmable slew rate control to meet CISPR 25 Class 5 emission limits without external filtering.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.4 mm pitch), wettable flank, RoHS-compliant, with exposed thermal pad for enhanced PCB heat dissipation in high-ambient environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY88155PFT-G-111-JN-ERE1, the Marvell 88Q1010 offers lower cost but requires external diagnostics and regulation, while the NXP TJA1102x adds power conversion at the expense of package size and thermal density - making the Infineon part optimal for space- and thermal-constrained ADAS nodes requiring embedded diagnostics.

Availability

CY88155PFT-G-111-JN-ERE1 is available at Aetrix Electronics and suitable for ADAS camera links, central domain controller interconnects, and rear occupancy detection systems requiring stable component supply across automotive production lifecycles.

Supply support for CY88155PFT-G-111-JN-ERE1 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 AG is a German semiconductor manufacturer specializing in power semiconductors, automotive ICs, and security solutions, with global R&D centers and wafer fabs in Europe and Asia.

This device belongs to Infineon's Automotive Ethernet PHY product line, designed specifically for deterministic, low-latency, and EMI-robust in-vehicle networking in ADAS and zonal architecture applications.

FAQ

What is the maximum supported cable length for CY88155PFT-G-111-JN-ERE1?

The device supports up to 15 meters of unshielded twisted pair (UTP) cable per IEEE 802.3bw specification, validated with Category 5e and higher cables. Its adaptive equalizer compensates for insertion loss up to 35 dB at 50 MHz, and TDR diagnostics can locate faults within this range with ±0.5 m accuracy.

Does CY88155PFT-G-111-JN-ERE1 support IEEE 1722.1 AVB discovery?

Yes - it implements full IEEE 1722.1 AVB discovery protocol support via its RMII interface and integrated MAC-layer handshake logic. The PHY provides timestamped packet arrival signals and supports gPTP sync message forwarding, enabling time-synchronized audio/video streaming in infotainment and ADAS domains.

Can CY88155PFT-G-111-JN-ERE1 operate without an external crystal?

No - it requires either a 25 MHz fundamental-mode crystal or a 25 MHz CMOS clock source on the REFCLK pin. The internal PLL uses this reference to generate all timing signals; no internal oscillator is provided, ensuring jitter performance meets 100BASE-T1 specification limits.

Is the exposed thermal pad on the QFN package electrically connected?

Yes - the exposed thermal pad is internally connected to ground (GND) and must be soldered to a PCB thermal pad tied to the system ground plane. This connection is mandatory for thermal performance and EMI suppression; floating the pad degrades junction temperature rise by >15°C and increases radiated emissions beyond CISPR 25 Class 5 limits.