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Infineon Technologies CY8C3446AXI-099T — Microcontrollers & Processors (MCU / MPU / DSP)

CY8C3446AXI-099T PSOC 3 MCU, 8051 50MHz, 64KB Flash

MPNCY8C3446AXI-099T
End of Life

Infineon (Cypress) PSOC® 3 CY8C34xx, CY8C3446AXI-099T, 8-bit 8051 MCU, 50MHz, 64KB Flash, 8K x 8 RAM, 2K x 8 EEPROM, 62 I/O, CapSense, USB, 100-TQFP, -40°C to 85°C.

$14.1Ref. price · indicative, final on quote
Infineon Technologies CY8C3446AXI-099T datasheet (PDF)
Packaging100-LQFP
RoHSROHS3 Compliant
SeriesPSOC® 3 CY8C34xx
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

CY8C3446AXI-099T specifications
ParameterValue
SeriesPSOC® 3 CY8C34xx
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.71V ~ 5.5V
Operating temperature-40°C ~ 85°C (TA)
Speed50MHz
PackageTape & Reel (TR); Cut Tape (CT)
RAM size8K x 8
Core size8-Bit
EEPROM size2K x 8
PeripheralsCapSense, DMA, LCD, POR, PWM, WDT
ConnectivityEBI/EMI, I²C, LINbus, SPI, UART/USART, USB
Number of i (O)62
Core processor8051
Case100-LQFP
Data convertersA/D 16x12b; D/A 2x8b
Program memory size64KB (64K x 8)

Product details

The CY8C3446AXI-099T is an 8-bit 8051 MCU clocked at 50 MHz, part of the PSOC® 3 CY8C34xx family from Infineon (formerly Cypress). It carries 64 KB of Flash program memory, 8K x 8 of RAM, and 2K x 8 of EEPROM — enough code and data space for a medium-complexity control loop with field-upgradeable firmware. The 8051 core at this speed handles real-time tasks like sensor polling, PID updates, and communication stack processing without a dedicated co-processor.

CapSense and mixed-signal peripherals

On-chip peripherals include CapSense (capacitive touch sensing), DMA, LCD drive, POR, PWM, and WDT. For a touch-interface panel or an analog sensor front-end, you can route signals directly into the ADC without an external converter.

Frequently asked questions

Is CY8C3446AXI-099T obsolete or active?

The CY8C3446AXI-099T is Active — no end-of-life or last-time-buy notice is in effect. It is safe to commit to a production BOM without near-term redesign risk.

What is the equivalent of CY8C3446AXI-099T?

Within the PSOC® 3 CY8C34xx family, density variants share the same 8051 core and peripheral set, but a direct drop-in replacement from another manufacturer is not documented.

How to program CY8C3446AXI-099T?

Programming is done via the standard PSOC® Creator IDE or a third-party toolchain supporting the 8051 core. The device uses an internal oscillator and supports in-system programming through the SWD (Serial Wire Debug) interface. No external crystal is required for programming.