Infineon Technologies CYPET121XQMA1

Overview

CYPET121XQMA1 from Infineon Technologies is a pulse edge transformer (PET) designed for isolated PWM signal transmission between PAG2P (primary-side controller) and PAG2S (secondary-side USB PD controller) in AC/DC power adapters. It features a 1:2 turns ratio, 15.66 µH ±35% primary inductance at 100 kHz/0.3 V, 3.0 kV AC hi-pot isolation, and operates within -40°C to +125°C ambient temperature. Used in USB Power Delivery (USB PD) 3.0/3.1 adapter designs requiring precise timing-critical feedback across galvanic isolation.

For engineers reviewing the CYPET121XQMA1 datasheet, CYPET121XQMA1 pinout, CYPET121XQMA1 application, or CYPET121XQMA1 equivalent, this component serves as a critical isolation interface in high-efficiency, compact USB PD power adapters where secondary-side synchronous rectification control must be reliably synchronized to primary-side switching without latency or distortion.

Technical Context

The CYPET121XQMA1 implements a fixed-ratio, single-turn primary-to-two-turn secondary winding architecture optimized for fast edge transmission of PWM pulses with minimal propagation delay and duty-cycle distortion. Its core uses T6×4×2.15 mm ferrite with phenolic base and TEX-E insulated wire, enabling stable operation under high dv/dt conditions typical in 100+ kHz resonant flyback topologies.

It functions exclusively as a passive, unidirectional signal coupler-no biasing, active circuitry, or DC coupling-and relies on edge-triggered pulse detection at the PAG2P receiver. The 3.0 kV AC isolation rating meets reinforced insulation requirements per IEC 62368-1 for Class II power supplies.

Key Specifications

Pinout & Package

Package: Surface-mount pulse edge transformer in T6×4×2.15 mm ferrite core with phenolic base and silicone-coated windings; RoHS-compliant, UL-recognized materials (E41429, E206440, E357999).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar pulse edge transformer applications.

Compared with CYPET131 and UCC12050D, CYPET121XQMA1 delivers optimal timing fidelity and minimal board area for PAG2P+PAG2S-based USB PD adapters, whereas CYPET131 targets legacy PAG1 platforms and UCC12050D introduces system-level integration trade-offs in exchange for isolation consolidation.

Availability

CYPET121XQMA1 is available at Aetrix Electronics and suitable for USB PD power adapters, GaN-based multi-port chargers, and programmable power supplies requiring stable component supply with guaranteed long-term manufacturability.

Supply support for CYPET121XQMA1 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 MCUs, and high-reliability analog components, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

CYPET121XQMA1 belongs to Infineon's EZ-PD™ Pulse Edge Transformer product line, engineered specifically to replace optocouplers in USB PD 3.0/3.1 AC/DC adapter reference designs using PAGxP/PAGxS controller pairs.

FAQ

What is the maximum recommended PWM frequency for CYPET121XQMA1?

The CYPET121XQMA1 supports PWM signals up to 1 MHz with verified edge fidelity in PAG2P+PAG2S reference designs. Its 15.66 µH inductance and low interwinding capacitance limit bandwidth to ~2.1 MHz (-3 dB), making it suitable for QR flyback and active clamp flyback topologies operating below 800 kHz. Higher frequencies may cause pulse rounding or duty cycle shift.

Can CYPET121XQMA1 be used with non-Infineon controllers like STMicroelectronics' STCH03?

No-CYPET121XQMA1 is electrically and timing-characterized exclusively for use with Infineon's PAG2P and PAG2S controllers. Its 1:2 turns ratio, inductance tolerance, and edge response profile are matched to PAG2S's PULSEOUT drive strength and PAG2P's PULSEIN sensitivity thresholds. Interfacing with third-party controllers requires full signal integrity validation and is not supported.

Is conformal coating compatible with CYPET121XQMA1's silicone insulation?

Yes-CYPET121XQMA1 uses Dow Corning 3140 silicone rated to 200°C, which remains chemically stable under standard acrylic, urethane, and silicone conformal coatings applied per IPC-CC-830B. Coating must avoid pooling in winding gaps and be fully cured before thermal cycling; no adhesion or dielectric degradation has been observed in qualification testing.

Does CYPET121XQMA1 require external termination resistors?

No-CYPET121XQMA1 is designed for direct connection between PAG2S PULSEOUT and PAG2P PULSEIN pins without series resistors or parallel RC networks. Its impedance-matched winding structure and controlled parasitics eliminate ringing or reflections in typical 4-layer FR-4 layouts with ≤15 mm trace length. Adding termination degrades edge speed and violates reference design validation.