PIC17C43T-25I/PQ - 8-bit 25MHz OTP MCU 8KB EPROM | Microchip
MPN： PIC17C43T-25I/PQ ✗ 停產PIC17C43T-25I/PQ 概覽
An MCU (microcontroller) is a single-chip computer that combines a CPU core, program and data memory, peripherals, and I/O on one die. The PIC17C43 belongs to the 8-bit PIC family, itself part of the broader microcontroller / embedded controller / semiconductor hierarchy. Within Microchip's lineup, PIC17C5x sits above PIC16C5x and below PIC18 in capability, offering an extended instruction set with only 58 single-word instructions to learn.
Key features include a 121 ns single-cycle instruction execution (program branches and table reads/writes are two-cycle), an operating voltage range of 4.5 V to 6 V, an industrial temperature grade of -40 C to +85 C, and an 8-level hardware stack. The device provides multiple peripherals: a 16-bit timer/counter with prescaler, capture/compare/PWM modules, an 8-bit A/D converter, a USART, and a synchronous serial port (SSP) for SPI/I2C communication.
The PIC17C43 uses a RISC Harvard architecture with separate program and data paths, enabling simultaneous instruction fetch and data access. The 16-bit-wide instruction word and 8-bit data bus yield efficient code density, while the integrated watchdog timer and power-on reset improve system robustness in noisy industrial environments.
Typical applications include industrial automation controllers, motor control, automotive subsystems, consumer electronics, and embedded control where OTP programmability and 8-bit simplicity are preferred over larger flash-based MCUs. Its 33 I/O pins support direct interfacing to keypads, displays, sensors, and power switches.
When designing with this part, plan for OTP programming: the device cannot be re-flashed in-circuit, so code must be validated before commitment. An erasable CERDIP variant (JW package) exists for development. Adequate decoupling and oscillator layout are essential for the high-frequency 25 MHz operation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 PIC17C43T-25I/PQ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC17C43T-25I/PQ （相同外形與佔位） — 差異在於 Package, Program Memory Size, Operating Temperature Range, Mounting Type, Program Memory Type.
PIC17C43T-25/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC17C43-16I/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC17C43-16E/P
✅ 直接替換聯絡詢價
查看資料表 →PIC17C42A-25/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC17C43T-25E/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC17CR43T-25I/PQ
✅ 直接替換📋 參考替代品（不在目錄中）
PIC17C43T-25I/PQ 最大額定值與電氣特性
| Core Architecture | PIC 8-bit RISC |
| Family | PIC17C |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 8 KB (4K x 16) |
| Data RAM | 454 bytes |
| 最大時脈頻率 | 25 MHz |
| Instruction Cycle Time | 121 ns (single cycle) |
| Throughput | 8.25 MIPS |
| Supply Voltage (Vcc) | 4.5 V to 6 V |
| I/O Pins | 33 |
| Timers | 16-bit timer/counter with prescaler |
| A/D Converter | 8-bit, multi-channel |
| Communication Peripherals | USART, SSP (SPI/I2C) |
| 工作溫度範圍 | -40 C to +85 C (Industrial) |
| 封裝 | 44-MQFP (PQ, 10x10 mm) |
| 安裝類型 | Surface Mount |
| Instruction Set | 58 single-word instructions |
| Hardware Stack | 8-level |
| Watchdog Timer | Yes |
| RoHS 狀態 | unknown |
PIC17C43T-25I/PQ 腳位配置
| 腳位 1 | MCLR — Master Clear (reset) input, active low |
| 腳位 2 | RA0 — PORTA bit 0 (digital I/O or analog input) |
| 腳位 3 | RA1 — PORTA bit 1 (digital I/O or analog input) |
| 腳位 4 | RA2 — PORTA bit 2 (digital I/O or analog input) |
| 腳位 5 | RA3 — PORTA bit 3 (digital I/O or analog input) |
| 腳位 6 | RA4 — PORTA bit 4 (digital I/O) |
| 腳位 7 | RA5 — PORTA bit 5 (digital I/O) |
| 腳位 8 | RE0 — PORTE bit 0 (digital I/O or analog input) |
| 腳位 9 | RE1 — PORTE bit 1 (digital I/O or analog input) |
| 腳位 10 | RE2 — PORTE bit 2 (digital I/O or analog input) |
| 腳位 11 | Vdd — Positive supply voltage (4.5V-6V) |
| 腳位 12 | Vss — Ground |
| 腳位 13 | OSC1 — Oscillator input (crystal or external clock) |
| 腳位 14 | OSC2 — Oscillator output (crystal) |
| 腳位 15 | RC0 — PORTC bit 0 (digital I/O or USART TX/CK) |
| 腳位 16 | RC1 — PORTC bit 1 (digital I/O or USART RX/DT) |
| 腳位 17 | RC2 — PORTC bit 2 (digital I/O or CCP1) |
| 腳位 18 | RC3 — PORTC bit 3 (digital I/O or SSP SCL/SCLK) |
| 腳位 19 | RD0 — PORTD bit 0 (digital I/O) |
| 腳位 20 | RD1 — PORTD bit 1 (digital I/O) |
| 腳位 21 | RD2 — PORTD bit 2 (digital I/O) |
| 腳位 22 | RD3 — PORTD bit 3 (digital I/O) |
| 腳位 23 | RC4 — PORTC bit 4 (digital I/O or SSP SDA/SDI) |
| 腳位 24 | RC5 — PORTC bit 5 (digital I/O or SSP SDO) |
| 腳位 25 | RC6 — PORTC bit 6 (digital I/O) |
| 腳位 26 | RC7 — PORTC bit 7 (digital I/O) |
| 腳位 27 | RD4 — PORTD bit 4 (digital I/O) |
| 腳位 28 | RD5 — PORTD bit 5 (digital I/O) |
| 腳位 29 | RD6 — PORTD bit 6 (digital I/O) |
| 腳位 30 | RD7 — PORTD bit 7 (digital I/O) |
| 腳位 31 | Vss — Ground |
| 腳位 32 | Vdd — Positive supply voltage (4.5V-6V) |
| 腳位 33 | RB0 — PORTB bit 0 (digital I/O with interrupt-on-change) |
| 腳位 34 | RB1 — PORTB bit 1 (digital I/O with interrupt-on-change) |
| 腳位 35 | RB2 — PORTB bit 2 (digital I/O with interrupt-on-change) |
| 腳位 36 | RB3 — PORTB bit 3 (digital I/O with interrupt-on-change) |
| 腳位 37 | RB4 — PORTB bit 4 (digital I/O with interrupt-on-change) |
| 腳位 38 | RB5 — PORTB bit 5 (digital I/O with interrupt-on-change) |
| 腳位 39 | RB6 — PORTB bit 6 (digital I/O with interrupt-on-change) |
| 腳位 40 | RB7 — PORTB bit 7 (digital I/O with interrupt-on-change) |
| 腳位 41 | NC — Not connected |
| 腳位 42 | NC — Not connected |
| 腳位 43 | NC — Not connected |
| 腳位 44 | NC — Not connected |
典型應用
PIC17C43T-25I/PQ 適用於 6 應用s: Industrial Automation Controllers, Motor Control and PWM Drive, Automotive Subsystem Controllers, Consumer Electronics User Interfaces, Smart Sensor and Instrumentation Hubs, Embedded Control and Educational Platforms.
Industrial Automation Controllers
The PIC17C43T-25I/PQ suits industrial PLC and controller boards where deterministic 8-bit performance and rugged 5 V operation are required. Its 25 MHz clock yields 121 ns instruction execution for fast scan times in ladder-logic emulation, while the 33 I/O pins drive relays, opto-isolators, and indicator LEDs directly. Industrial -40 to +85 C operation tolerates factory-floor thermal stress, and 454 bytes RAM support small protocol stacks. The OTP EPROM holds verified control firmware without in-field reprogrammability risk.
推薦
Motor Control and PWM Drive
The PIC17C43T-25I/PQ drives DC and stepper motors via its Capture/Compare/PWM (CCP) module and 16-bit timer, generating precision PWM up to 25 MHz timer tick. Its 8-bit ADC samples current and back-EMF feedback for closed-loop speed control, while 33 I/O lines connect to H-bridge drivers and encoder inputs. Industrial temperature grade and 5 V tolerance suit harsh motor enclosures. Engineers can implement trapezoidal commutation in software, leveraging the 121 ns instruction cycle for low-latency control loops.
推薦
Automotive Subsystem Controllers
The PIC17C43T-25I/PQ powers automotive body and chassis subsystems such as lighting controllers, HVAC flaps, and accessory multiplexers, leveraging its wide 5 V tolerance and 33 digital I/O. The integrated USART and SSP support LIN-style or SPI communication with BCM/ECU masters, while the 8-bit ADC reads thermistor and position sensors. Although not AEC-Q100 qualified, the industrial temperature grade meets many interior cabin requirements. Its OTP memory locks calibration constants, preventing end-user modification.
推薦
Consumer Electronics User Interfaces
The PIC17C43T-25I/PQ implements consumer user-interface controllers for appliances, toys, and small appliances that need 33 I/O to drive keypads, 7-segment displays, and LED indicators. The 8 KB OTP holds graphical menu logic and timing routines, and the 8-bit ADC reads touch or potentiometer inputs. Industrial temperature tolerance supports kitchen and laundry environments where heat and humidity challenge commercial-grade parts. Program memory density allows full keypad scanning plus sensor fusion in firmware.
推薦
Smart Sensor and Instrumentation Hubs
The PIC17C43T-25I/PQ serves as a sensor hub in instrumentation, multiplexing analog inputs through its 8-bit ADC and forwarding digital data via USART or SPI to a host processor. Its 454 bytes RAM buffer sensor packets before transmission, and the 25 MHz throughput ensures responsive data acquisition at sub-millisecond intervals. The watchdog timer and brown-out reset improve field reliability for unattended sensor installations. Industrial temperature grade and 5 V operation suit process-control analog front ends.
推薦
Embedded Control and Educational Platforms
The PIC17C43T-25I/PQ remains useful for educational and legacy embedded designs because of its simple 58-instruction set, RISC architecture, and rich peripheral documentation. With 33 I/O, an 8-bit ADC, USART, and SSP, students can learn timers, interrupts, PWM, and serial protocols on a single chip. The 8 KB OTP holds moderately-sized C or assembly projects, and the 44-MQFP package exposes all pins on standard breakout boards. Recommended PIC18F migration target: PIC18F4220 for new curricula.
推薦
推薦產品摘要
工程參考資料，適用於 PIC17C43T-25I/PQ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC17C43T-25/PQ | PIC17C43-16I/PQ | PIC17C42A-25/PT | PIC17CR43T-25I/PQ |
|---|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-TQFP | 44-MQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 25 MHz | 25 MHz | 16 MHz (-36%) | 25 MHz | 25 MHz |
| Program Memory | 8 KB OTP EPROM | 8 KB OTP EPROM | 8 KB OTP EPROM | 4 KB OTP EPROM (-50%) | 4K words Mask ROM |
| Temperature Grade | Industrial -40 to +85 C | Commercial 0 to +70 C | Industrial -40 to +85 C | Commercial 0 to +70 C | Industrial -40 to +85 C |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Program Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Mask ROM (factory programmed) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
主要差異化特點
- Higher clock speed at same package (對比PIC17C43-16I/PQ)
- Industrial temperature vs commercial (對比PIC17C43T-25/PQ)
- Reprogrammable upgrade path (對比PIC17CR43T-25I/PQ)
設計說明
Estimated: the PIC17C43T-25I/PQ draws up to ~50 mA active at 25 MHz from a 5 V rail, plus I/O sink currents. Place a 100 nF ceramic decoupling capacitor close to each Vdd pin (pins 11 and 32 in the 44-MQFP) and a bulk 10 uF tantalum or aluminum capacitor at the regulator output. Ground returns must use a low-impedance pour connecting both Vss pins (12 and 31). Inductive loads on outputs require flyback diodes and, for relays, separate Vdd rails to prevent MCU reset from supply transients.
Place the 25 MHz crystal or resonator within 5 mm of OSC1 (pin 13) and OSC2 (pin 14) with short, equal-length traces and a ground guard ring to minimize EMI coupling. Keep high-speed digital traces away from the analog ADC inputs (PORTA/PORTE) and add a 100 nF cap on AVdd if the ADC is used. The 44-MQFP package benefits from thermal vias under the die-attach pad area to spread heat during sustained I/O switching at 25 MHz.
The PIC17C43T-25I/PQ uses OTP EPROM: code cannot be erased or rewritten in-circuit. Validate firmware on a JW-windowed CERDIP variant (PIC17C43T-25/JW) or use MPLAB simulator before committing to OTP programming. Brown-out detection and watchdog timer must be enabled in configuration bits to recover from power transients. MCLR (pin 1) requires a 10 kohm pull-up to Vdd; floating MCLR can cause spurious resets. Exceeding 6 V on Vdd permanently damages the device.
合規資訊
RoHS, REACH, lead-free, and halogen-free status not stated in the Verified Web Data for PIC17C43T-25I/PQ; marked 'unknown' until confirmed via manufacturer documentation. Part is not AEC-Q100 qualified - automotive designs should validate or migrate to PIC18F-based parts.
