PIC24FJ128GA204-E/PT
PIC24FJ128GA204-E/PT - 16-bit XLP MCU w/ Crypto 128KB TQFP-44 | Microchip
The Microchip PIC24FJ128GA204-E/PT is a 16-bit PIC24F eXtreme Low Power (XLP) microcontroller featuring an integrated hardware cryptographic engine, 128KB Flash, 8KB RAM, and a 32MHz (16 MIPS) core, packaged in a 44-pin TQFP (10x10 mm). It belongs to the PIC24FJ128GA204 family and is engineered for low-power embedded applications that also demand on-chip security primitives. The on-die crypto engine accelerates AES, DES, 3DES, and SHA-1/MD5/HMAC operations, offloading security workloads from the CPU and enabling secure firmware update, secure boot, and authenticated communication without external cryptographic ICs.
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory (typically Flash), data memory (RAM), and a rich set of on-chip peripherals such as timers, communication interfaces, and analog-to-digital converters. The PIC24FJ family combines a 16-bit modified Harvard architecture with Microchip's XLP energy-management technology, sitting within the broader category of microcontrollers -> RISC microcontrollers -> 16-bit microcontrollers -> low-power microcontrollers -> power-conscious embedded controllers. This hierarchy matters because choosing an MCU defines the entire firmware toolchain (compiler, IDE, debugger), interrupt architecture, and peripheral programming model for the product lifetime.
Key features of the PIC24FJ128GA204-E/PT include 128KB of self-programmable Flash with 43K x 24 organization, 8KB SRAM, integrated crypto engine supporting AES (128/192/256-bit), DES/3DES and SHA-1/MD5 hash, peripheral Direct Memory Access (DMA) for offloading CPU data movement, four 16-bit timers, multiple UART/SPI/I2C interfaces, a 10/12-bit ADC, and eXtreme Low Power sleep currents in the microamp range. The "E" suffix designates the -40C to +125C extended operating temperature range; the "PT" suffix denotes the TQFP-44 (10x10 mm) package. The wide temperature grade and integrated crypto make this part well suited to industrial security and consumer metering applications.
The architecture pairs the PIC24F modified Harvard CPU with a 16-bit instruction word and 24-bit data path, providing 16 MIPS throughput at 32MHz while preserving the low-power profile that defines the family. The DMA controller can move data between peripherals and memory without CPU intervention, ideal for continuous ADC sampling or streaming I2S audio. Combined with the hardware crypto engine, designers can implement secure sensor-to-cloud nodes that spend most of their duty cycle in deep sleep, wake on interrupt, perform an AES transaction over I2C or SPI, and return to sleep.
Typical applications include secure IoT end nodes with authenticated firmware update, smart meters and energy-harvesting sensors, ISO 7816 smart-card interfaces, portable medical devices that must encrypt patient data at rest, secure industrial HMI panels, and battery-powered wireless sensor hubs. The part also exposes I2S support, making it a fit for low-cost audio capture with on-device encryption.
Design considerations include providing a stable 2.0V-3.6V supply rail, decoupling VDD with 100nF and 10uF capacitors adjacent to the pins, leaving unused GPIO as outputs to minimize current draw, configuring the crypto engine keys in secure memory before exposure, and using the JTAG/ICSP interface via dedicated pins for in-circuit programming. Designers should also budget for the extended temperature grade implications on oscillator compensation.
This page synthesizes distributor pricing, drop-in same-package alternatives, parametric comparison with adjacent PIC24F parts, and practical low-power design notes not consolidated on the manufacturer overview page.
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