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Infineon Technologies CY8C4045LQI-S411T — Microcontrollers & Processors (MCU / MPU / DSP)

CY8C4045LQI-S411T PSoC 4 MCU, 48 MHz Cortex-M0+, 32 KB Flash

MPNCY8C4045LQI-S411T
End of Life

Infineon PSoC® 4 CY8C4000S series, CY8C4045LQI-S411T, 32-Bit ARM Cortex-M0+ MCU, 48 MHz, 32 KB Flash, 4K x 8 RAM, 19 I/O, 1.71V ~ 5.5V, -40°C ~ 85°C, 24-QFN (4x4 mm).

$3.16Ref. price · indicative, final on quote
Infineon Technologies CY8C4045LQI-S411T datasheet (PDF)
Packaging24-UFQFN Exposed Pad
RoHSROHS3 Compliant
SeriesPSOC® 4 CY8C4000S
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

CY8C4045LQI-S411T specifications
ParameterValue
SeriesPSOC® 4 CY8C4000S
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.71V ~ 5.5V
Operating temperature-40°C ~ 85°C (TA)
Speed48MHz
PackageTape & Reel (TR); Cut Tape (CT)
RAM size4K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, CapSense, LCD, LVD, POR, PWM, WDT
ConnectivityI²C, IrDA, LINbus, Microwire, SmartCard, SPI, SSP, UART/USART
Number of i (O)19
Core processorARM® Cortex®-M0+
Case24-UFQFN Exposed Pad
Data convertersA/D 1x10b
Program memory size32KB (32K x 8)

Product details

What this PSoC 4 brings to a touch- or display-oriented BOM

It carries 32 KB of Flash and 4 KB of RAM. The supply range runs from 1.71 V up to 5.5 V, so a single Li-ion cell or two alkaline cells in series can power it without a regulator. The 24-QFN package with exposed pad (4x4 mm body) fits into handheld enclosures and sensor modules where board area is tight. Operating temperature is -40°C to 85°C, covering industrial control panels, outdoor telecom gear, and consumer appliances — not under-hood or extended-temp environments.

The Cortex-M0+ core runs at 48 MHz. The 4 KB RAM handles a touch-report table and an LCD frame buffer.

Package and rework — the 24-QFN with exposed pad

Frequently asked questions

Is CY8C4045LQI-S411T RoHS compliant?

Yes, it is ROHS3 compliant.

What is the difference between CY8C4045LQI-S411 and CY8C4045LQI-S411T?

The -S411T variant is the Tape & Reel (TR) and Cut Tape (CT) packaging option; the -S411 suffix typically denotes tray packaging. The silicon is identical.

When sourcing CY8C4045LQI-S411T, what's the closest functional second-source?

The CY8C4245LQI-483 is a PSoC 4 peer with the same 48 MHz Cortex-M0 core, 32 KB Flash, and CapSense peripheral set, but it offers 34 I/O and 8x12-bit SAR ADC plus dual IDACs in a larger package. It is not pin-compatible — the 24-QFN footprint is different — but the firmware and peripheral API are largely portable.