PIC17C44T-25I/PT - 8-Bit 25MHz 16KB OTP MCU 44-TQFP | Microchip
MPN: PIC17C44T-25I/PT ✗ Cuối đờiPIC17C44T-25I/PT Tóm tắt
What is an 8-bit microcontroller? An 8-bit microcontroller is a single-chip computer that processes data in 8-bit chunks using a CPU, program memory, data RAM, and integrated peripherals. The PIC17C44T sits in the PIC17C high-end 8-bit family - historically Microchip's fastest 8-bit OTP line, positioned between the standard PIC16 and later PIC18 architectures. In the broader taxonomy: microcontroller -> 8-bit MCU -> RISC MCU -> embedded controller -> semiconductor. It is intended for industrial-grade embedded designs where deterministic instruction execution and integrated peripherals reduce external component count.
Key features of the PIC17C44T-25I/PT include 16 KB (8K x 16) EPROM program memory, 454 bytes of data RAM, 33 I/O pins, and a 25 MHz maximum clock speed driving a RISC instruction set. The TQFP-44 (10x10 mm) surface-mount package supports industrial operating temperatures per the "I" suffix. The part supports OTP one-time-programmable memory useful for production volumes where code is final and frequent field updates are not required. "T" in the part number denotes tape-and-reel packaging per Microchip ordering nomenclature.
At the architectural level, the PIC17C44 family is built on a Harvard-architecture RISC core, separating program and data buses for parallel instruction fetch and operand access. The RISC instruction set aims to execute most instructions in a single instruction cycle, supporting deterministic interrupt response and predictable timing. The on-chip EPROM allows factory or prototype programming, while the integrated oscillator, timer, and interrupt controller reduce external glue logic.
Typical applications include industrial process controllers, motor drive sequencers, instrument front-panel controllers, factory automation front-ends, and prototype / low-volume production appliances where an 8-bit RISC MCU provides sufficient control with minimal board area. Designers typically pair the PIC17C44T with sensors, optocouplers, power-driver ICs, and character or graphical LCDs.
When designing with this part, note that PIC17C44 is a mature, NRND/EOL family - confirm long-term supply and the latest Microchip product-change notifications before specifying it for new production. Plan firmware in a compatible C or assembly toolchain and verify that the I/O count and peripheral mix match system requirements. Use decoupling capacitors per Microchip's recommended layout and place the EPROM-programmed reset circuit close to the MCLR pin for clean brown-out behavior.
This page consolidates distributor pricing from Mouser and DigiKey, plus drop-in and same-family alternatives from Microchip, into a single technical reference that complements the official datasheet with cross-validated package, lifecycle, and parametric data.
Bộ thay thế dễ dàng lắp đặt cho PIC17C44T-25I/PT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC17C44T-25I/PT (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Maximum Clock Frequency, Operating Temperature, Program Memory Size.
PIC17C44-25I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44-16I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C44T-25I/PT Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit RISC (Harvard) |
| Family | PIC17C |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 16 KB (8K x 16 words) |
| Data RAM | 454 bytes |
| Tần số xung maksimum | 25 MHz |
| I/O Pins | 33 |
| Hộp | 44-TQFP (10x10 mm) |
| Khoảng nhiệt độ hoạt động | -40C to +85C (Industrial, "I" suffix) |
| Terminal Form | GULL WING |
| Package Code | TQFP |
| Package Shape | SQUARE |
| Number of Terminals | 44 |
| Temperature Grade | INDUSTRIAL |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân PIC17C44T-25I/PT
| Chân 1 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 2 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 3 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Chân 4 | RA3/AN3 — PORTA bit 3 / analog input 3 |
| Chân 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 6 | RA5/SS — PORTA bit 5 / SPI slave select |
| Chân 7 | OSC1 — Oscillator input |
| Chân 8 | OSC2 — Oscillator output |
| Chân 9 | RC0 — PORTC bit 0 |
| Chân 10 | RC1 — PORTC bit 1 |
| Chân 11 | RC2 — PORTC bit 2 |
| Chân 12 | RC3 — PORTC bit 3 |
| Chân 13 | RC4 — PORTC bit 4 |
| Chân 14 | RC5 — PORTC bit 5 |
| Chân 15 | RC6 — PORTC bit 6 |
| Chân 16 | RC7 — PORTC bit 7 |
| Chân 17 | RB0/INT — PORTB bit 0 / external interrupt |
| Chân 18 | RB1 — PORTB bit 1 |
| Chân 19 | RB2 — PORTB bit 2 |
| Chân 20 | RB3 — PORTB bit 3 |
| Chân 21 | RB4 — PORTB bit 4 |
| Chân 22 | RB5 — PORTB bit 5 |
| Chân 23 | RB6 — PORTB bit 6 |
| Chân 24 | RB7 — PORTB bit 7 |
| Chân 25 | VDD — Positive supply |
| Chân 26 | VSS — Ground |
| Chân 27 | RD0 — PORTD bit 0 |
| Chân 28 | RD1 — PORTD bit 1 |
| Chân 29 | RD2 — PORTD bit 2 |
| Chân 30 | RD3 — PORTD bit 3 |
| Chân 31 | RD4 — PORTD bit 4 |
| Chân 32 | RD5 — PORTD bit 5 |
| Chân 33 | RD6 — PORTD bit 6 |
| Chân 34 | RD7 — PORTD bit 7 |
| Chân 35 | RE0 — PORTE bit 0 |
| Chân 36 | RE1 — PORTE bit 1 |
| Chân 37 | RE2 — PORTE bit 2 |
| Chân 38 | MCLR — Master clear reset |
| Chân 39 | NC — Not connected |
| Chân 40 | NC — Not connected |
| Chân 41 | NC — Not connected |
| Chân 42 | NC — Not connected |
| Chân 43 | NC — Not connected |
| Chân 44 | NC — Not connected |
Ứng dụng tiêu biểu
PIC17C44T-25I/PT phù hợp cho 6 Áp dụngs: Industrial Process Controllers, Motor Drive Sequencers, Instrument Front-Panel Controllers, Embedded Sensor Hubs, Factory Automation Front-Ends, Appliance and HVAC Control Boards.
Industrial Process Controllers
The PIC17C44T-25I/PT fits industrial process controllers because its 25 MHz RISC core and 454 bytes of RAM can scan 4-20 mA loops, manage PID loops in firmware, and drive relay outputs in real time. The 16 KB OTP EPROM holds control logic plus simple HMI tables, while 33 I/O pins accept thermocouple inputs via external A/D converters and switch actuators through optocouplers and power-driver ICs.
Được đề xuất
Motor Drive Sequencers
In motor drive sequencer applications, the PIC17C44T-25I/PT delivers deterministic timing through its single-cycle RISC instruction set, enabling precise commutation sequences for stepper or brushed-DC motors. The 33 I/O pins drive phase-control logic ICs and accept quadrature-encoder feedback, while the 16 KB OTP stores acceleration ramps and fault-recovery routines.
Được đề xuất
Instrument Front-Panel Controllers
The PIC17C44T-25I/PT serves instrument front panels by driving character or graphical LCDs, scanning keypads, and streaming measurement data over UART or SPI. Its 33 I/O lines multiplex LCD data and keyboard rows, while the 454-byte RAM retains the active display buffer and last-measurement values between interrupts.
Được đề xuất
Embedded Sensor Hubs
As an embedded sensor hub, the PIC17C44T-25I/PT aggregates data from SPI or I2C sensors using its on-chip peripherals and 16 KB OTP for protocol stacks. The 25 MHz CPU processes sensor fusion and local filtering before forwarding results via UART, while 33 I/O pins accept discrete sensor inputs.
Được đề xuất
Factory Automation Front-Ends
The PIC17C44T-25I/PT supports factory automation front-ends by combining deterministic interrupts with 33 digital I/Os for PLC-style discrete I/O handling. Its OTP memory holds ladder-logic-equivalent firmware, while the 25 MHz RISC core executes scan cycles fast enough for sub-millisecond response on conveyor or packaging lines.
Được đề xuất
Appliance and HVAC Control Boards
In appliance and HVAC controller PCBs, the PIC17C44T-25I/PT manages triac/SCR drive, sensor acquisition, and user-interface scanning. The PIC17C RISC core executes proportional control loops while 33 I/Os handle keypad, LED, and relay switching; 16 KB OTP stores appliance parameters and diagnostic logs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C44T-25I/PT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC17C44-25I/PT | PIC17C44-16I/PT | PIC17C44T-25I/PQ | PIC17C43T-25I/PQ |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-MQFP - differs | 44-MQFP - differs |
| Core / Family | 8-bit RISC / PIC17C | 8-bit RISC / PIC17C | 8-bit RISC / PIC17C | 8-bit RISC / PIC17C | 8-bit RISC / PIC17C |
| Max Clock | 25 MHz | 25 MHz | 16 MHz | 25 MHz | 25 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Industrial | Industrial |
Bảo phân biệt quan trọng
- Higher CPU throughput than PIC16 midrange at the same clock (vsPIC16F877A)
- More RAM than typical PIC16 midrange (vsPIC16F877A)
- 44-TQFP industrial-grade packaging with 33 I/O (vsPIC16F877A in 40-PDIP)
Ghi chú thiết kế
Estimated: at 25 MHz the PIC17C44T-25I/PT draws approximately 25-30 mA from VDD; place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin and a bulk 10 uF tantalum or ceramic near the package. Add a ferrite bead on VDD when the supply rail also feeds switching regulators to suppress conducted noise on the MCU supply.
PIC17C44 is a mature 8-bit family approaching NRND/EOL - verify Microchip PCN status before specifying in new designs. The OTP EPROM cannot be re-programmed in-circuit, so plan development on a windowed (JW) device or equivalent flash PIC18 derivative, then migrate the OTP image for production.
Route the 25 MHz crystal traces on the top layer with short, symmetric lengths to OSC1/OSC2 and keep digital signals away from the oscillator area. Add a 4.7 kohm pull-up on MCLR and a 100 nF cap on MCLR-to-VSS per Microchip reset-circuit guidance to ensure clean brown-out behavior.
When driving long cables or relays from PORTB/PORTC/PORTD, use series resistors (100-470 ohm) near the MCU pin and add 1 nF-10 nF buffer caps on the connector side. The PIC17C44's 33 I/Os are 5 V TTL tolerant but not hot-swappable, so per-port clamping diodes or TVS arrays are recommended for industrial I/O.
Thông tin tuân thủ
Compliance values not present in the Verified Web Data snippets. Microchip generally declares lead-free and RoHS compliance on its current product lines, but the PIC17C44 legacy family should be checked against the latest PCN and material declaration documents.