Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Infineon Technologies CYAC1126-40LQXI

Name: CYAC1126-40LQXI
Brand: Infineon Technologies
SKU: CYAC1126-40LQXI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: CYAC1126-40LQXI

Manufacturer:: Infineon Technologies

Category:: Application Specific Microcontrollers

Package:: 40-UFQFN Exposed Pad

Datasheet:: CYAC1126-40LQXI.pdf

Description:: ACG1F

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,095

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

CYAC1126-40LQXI from Infineon is a single-port USB Type-C port controller with integrated Arm® Cortex®-M0 MCU (16 MHz, 16 KB flash, 4 KB SRAM), USB Type-C v1.3 PHY, dual VCONN FETs (1.0 W max), and a 5 V/3 A high-side VBUS load switch (R_DS(on) = 45 mΩ typ) in 40-QFN package. It supports BC v1.2 charge detection, UCSI over I²C, and VBUS protection including OVP, OCP, RCP, SCP, and thermal shutdown - deployed in notebook/desktop Type-A-to-Type-C conversion modules.

For engineers reviewing the CYAC1126-40LQXI datasheet, CYAC1126-40LQXI pinout, CYAC1126-40LQXI application, or CYAC1126-40LQXI equivalent, key selection criteria include VBUS load-switch current rating (3 A), VCONN sourcing capability (1.0 W), CC-line HV tolerance, programmable VBUS protection thresholds, and UCSI-compliant I²C interface timing.

Technical Context

The device implements a dedicated USB Type-C subsystem with two Deep Sleep comparators for CC attach/detach detection, Rp termination current sources, and high-voltage-tolerant CC1/CC2 I/Os (with internal VBUS-to-CC short protection up to 20 V). It integrates a 5 mΩ external sense-resistor-based high-side current sensing amplifier for precise VBUS OCP and RCP.

Its MCU subsystem runs at 16 MHz, executes firmware from 16 KB flash, boots from 32 KB SROM, and manages real-time Type-C state machines via dedicated hardware blocks - including TCPWM, 8-bit SAR ADC, and dual SCB (I²C) peripherals supporting master/slave UCSI and redriver control.

Key Specifications

Parameter	Value and Actual Design Meaning
USB Type-C Compliance	USB Type-C v1.3 PHY with Rp terminations, CC line comparators, and 20 V HV tolerance on CC pins
VBUS Load Switch	5 V/3 A NFET with 45 mΩ R_DS(on) (typ), slew-rate controlled gate driver, and thermal shutdown
VCONN Power Delivery	Dual integrated VCONN FETs; each supplies ≤1.0 W to EMCA cables via CC1 or CC2 (mutually exclusive)
Current Sensing	High-side VBUS sensing using external 5 mΩ Rsense; supports programmable OCP and RCP thresholds
MCU Core	Arm® Cortex®-M0 @ 16 MHz, 16 KB flash (in-system upgradeable), 4 KB SRAM, 32 KB SROM boot code
Protection Features	Configurable OVP/UVP, OCP, RCP (3 independent detection mechanisms), SCP, VBUS-to-CC short protection
Interface Support	Two I²C interfaces: one for UCSI host communication, one for external redriver/retimer/mux control

Pinout & Package

Package: 40-QFN, 0.5 mm pitch, industrial temperature range (–40°C to +85°C). Exposed thermal pad for enhanced power dissipation.

Pin/Terminal	Circuit Role	Design Meaning
CC1 / CC2	Type-C Configuration Channel I/O	High-voltage-tolerant bidirectional analog inputs for plug orientation detection and PD signaling (no PD protocol stack)
VBUS_P / VBUS_C	VBUS Provider/Connector Path	VBUS_P drives load switch NFET gate; VBUS_C connects to connector side for current sensing and protection monitoring
CSP / CSN	Current Sense Differential Inputs	Connect across external 5 mΩ Rsense to enable high-side VBUS current measurement and RCP/OCP detection
V5V	VCONN Power Supply Input	4.85–5.5 V input powering dual VCONN FETs; not used for chip core supply (VDDD only)
VDDD / VDDIO	Core & I/O Power Supply	Single 2.7–5.5 V supply powering MCU, PHY, and digital logic; supports mixed-voltage I/O operation
I²C_SDA / I²C_SCL	UCSI & Redriver Control Interface	Two independent I²C buses: one for host UCSI commands, one for configuring external signal-conditioning devices

Key Features

Feature	Design Value
Integrated VBUS Load Switch	Enables compact, discrete-free 5 V/3 A power path with programmable slew rate and multi-level fault protection
Dual VCONN FETs	Eliminates need for external VCONN regulators; supports active EMCA cables without additional PMIC overhead
BC v1.2 Charge Detection	Provides legacy USB charging compatibility without external charger ID circuitry or firmware extension
UCSI-Compliant I²C Interface	Direct integration with Windows OS USB-C policy manager via standardized UCSI command set over I²C
Three-Mechanism RCP Detection	Guarantees <1 µs response to reverse current events using CSP/CSN differential, VBUS/CSN comparison, and Vref-based voltage divider methods

Applications

USB-C Port Retrofit Module

Notebook Embedded Type-C Controller

Use Scenario: Adding native USB-C data and power delivery capability to legacy desktop motherboards with existing USB-A headers.

IC Role / Device Role / Timing Role: Acts as full Type-C port controller and VBUS power manager, translating legacy USB-A signals into compliant Type-C handshaking and power control.

Use Value: Enables OEMs to reuse existing platform designs while meeting modern USB-C compliance requirements without redesigning power delivery architecture.

Use Scenario: Native USB-C port implementation in thin-and-light notebooks where space and BOM count are critical constraints.

IC Role / Device Role / Timing Role: Central Type-C subsystem controller managing CC negotiation, VBUS switching, VCONN sourcing, and host UCSI reporting via I²C.

Use Value: Reduces component count by integrating MCU, PHY, load switch, and protection logic - cutting PCB area by >40% vs. discrete solution.

Desktop Docking Station Hub

USB-C Monitor with Data Tunneling

Use Scenario: Multi-port docking station supporting simultaneous USB 3.x data, DisplayPort Alt Mode, and 60 W power delivery passthrough.

IC Role / Device Role / Timing Role: Manages upstream Type-C port attachment, VBUS provider control, and VCONN power for downstream cable negotiation.

Use Value: Ensures stable VCONN supply during hot-plug events and prevents VBUS instability during DP Alt Mode transitions via fast RCP and OCP response.

Use Scenario: Monitor with embedded USB-C upstream port enabling video, audio, USB HID, and power delivery over single cable.

IC Role / Device Role / Timing Role: Handles CC line arbitration, VBUS provider enablement, and UCSI host notifications for OS-level USB-C policy enforcement.

Use Value: Supports Windows Precision Touchpad and HID enumeration via UCSI without requiring custom driver development.

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB Type-C port controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TUSB544RGET	No integrated MCU or flash; requires external microcontroller for state machine; no VCONN FETs; supports USB 3.1 Gen 1 redriving	Targeted at high-speed signal integrity enhancement rather than full port control; lacks BC v1.2 charge detect and UCSI support	Select when redriver functionality dominates over autonomous port management
UPD350A	Integrated USB PD 3.0 controller with full PD protocol stack; supports 100 W power delivery; no integrated VBUS load switch or VCONN FETs	Designed for full PD sink/source negotiation; requires external load switches and VCONN regulators	Select when USB Power Delivery negotiation (e.g., PPS, variable voltage) is mandatory

Compared with TUSB544RGET and UPD350A, CYAC1126-40LQXI uniquely combines autonomous Type-C port control, integrated VBUS switching, dual VCONN sourcing, and UCSI-ready I²C - eliminating external components needed for basic Type-C retrofit or embedded implementations without PD complexity.

Availability

CYAC1126-40LQXI is available at Aetrix Electronics and suitable for notebook USB-C retrofit modules, desktop docking stations, and embedded monitor controllers requiring stable component supply, industrial temperature operation, and long-term lifecycle support.

Supply support for CYAC1126-40LQXI 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 connectivity solutions, with global manufacturing and quality certifications including ISO/TS 16949 and ISO 9001.

CYAC1126-40LQXI belongs to Infineon's ACG1F product line - designed specifically for cost-optimized, single-port USB Type-C controller applications in computing platforms where PD protocol complexity is unnecessary but robust VBUS control and UCSI compliance are essential.

FAQ

Does CYAC1126-40LQXI support USB Power Delivery (PD) protocol negotiation?

No. CYAC1126-40LQXI implements only the USB Type-C physical layer (v1.3), including Rp/Rd terminations and CC line comparators, but does not include a USB PD protocol stack or BMC transceiver. It supports Type-C power roles (source/sink) only via fixed 5 V VBUS control and BC v1.2 charging, not programmable PD voltage profiles.

What is the maximum continuous current rating of the integrated VBUS load switch?

The integrated VBUS NFET supports 3 A continuous current at 5 V with R_DS(on) = 45 mΩ (typical) and includes thermal shutdown protection. Derating applies above +70°C ambient; full 3 A operation is validated within the industrial temperature range (–40°C to +85°C) with proper PCB thermal design per Infineon layout guidelines.

Can CYAC1126-40LQXI operate without an external current-sense resistor?

No. The high-side VBUS current sensing and all related protections (OCP, RCP, SCP) require an external 5 mΩ precision shunt resistor connected between VBUS_C and CSP/CSN pins. Omitting Rsense disables current-dependent protection functions and invalidates VBUS safety certification claims.

Is the Arm® Cortex®-M0 firmware field-upgradable?

Yes. Firmware stored in the 16 KB flash memory can be updated in-system via either the Serial Wire Debug (SWD) interface or the I²C bus using UCSI-compliant host commands. Bootloader resides in protected SROM and supports authenticated firmware images to prevent corruption during update cycles.

CYAC1126-40LQXI Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: ACG1F

Package/Case:: 40-UFQFN Exposed Pad

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

Applications:: USB Type C

Core Processor:: ARM® Cortex®-M0

Program Memory Type:: FLASH (16kB), ROM (32kB)

Controller Series:: -

RAM Size:: 4K x 8

Interface:: I2C, USB

Number of I/O:: 8

Voltage - Supply:: 2.7V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 40-QFN (6x6)

CYAC1126-40LQXI FAQ

1.How can I place an order for CYAC1126-40LQXI through Aetrix?

Please submit a Request for Quotation (RFQ) for CYAC1126-40LQXI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CYAC1126-40LQXI reliable?

The price and inventory of CYAC1126-40LQXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYAC1126-40LQXI is usually 5 days.

3.What payment methods are accepted for CYAC1126-40LQXI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYAC1126-40LQXI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CYAC1126-40LQXI?

CYAC1126-40LQXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CYAC1126-40LQXI order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CYAC1126-40LQXI?

For technical support, including CYAC1126-40LQXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYAC1126-40LQXI requirements.

6.How does Aetrix verify that CYAC1126-40LQXI is sourced from the original manufacturer or authorized distributors?

All CYAC1126-40LQXI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CYAC1126-40LQXI meets industry standards.

7.What is the process for return or replacement of CYAC1126-40LQXI?

All CYAC1126-40LQXI units undergo pre-shipment inspection (PSI). If there is an issue with CYAC1126-40LQXI, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CYAC1126-40LQXI part is unused and in its original packaging.

Return procedure for CYAC1126-40LQXI:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…

2026-07-08 Output Capacitor Selection for High-Current ASIC Vcore Rails

Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…

2026-07-07 High-Current ASIC Core Power Supply Design: 12-Phase Buck, PMBus and Dynamic Load Response

Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …

2026-07-06 Voltage Regulator: Types, Circuits, Testing and Selection Guide

Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.

2026-06-30 Amplifiers Explained: Types, Circuits, Gain, Classes and Applications

Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…