PIC17C44-25E/P - 8-Bit 25MHz CMOS OTP MCU 16KB | Microchip
料号： PIC17C44-25E/P ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $14.1 | $1,410.00 |
| 500 | $12.4 | $6,200.00 |
| 1,000 | $11.05 | $11,050.00 |
PIC17C44-25E/P 概述
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals onto one die. Microcontrollers sit in the embedded computing hierarchy between microprocessors (which need external peripherals) and ASICs (which are application-specific). The PIC17 family specifically bridges the gap between the simpler PIC16 family and higher-end dsPIC devices, targeting complex embedded control with C-friendly architectures and an enhanced instruction set.
Key features of the PIC17C44 include an 8-level deep hardware stack, multiply instruction, multiple interrupt sources with prioritized vectored interrupts, four capture/compare/PWM (CCP) modules, a USART with addressable hardware, an 11-channel 8-bit ADC, and a watchdog timer with on-chip RC oscillator. These peripherals deliver a richer feature set than PIC16C5X predecessors while keeping code compatibility upward toward PIC18.
The PIC17C44 uses Harvard architecture with separate program and data buses, plus a 16-bit wide program memory path that fetches instructions in a single cycle. This wider path, combined with a 25 MHz clock, is how it attains 8.25 MIPS performance. The wide instruction word also contributes to the relatively large 16KB program memory size for what is otherwise classified as an 8-bit MCU.
Typical applications include industrial control systems, motor control (when paired with the CCP/PWM peripherals), appliance controllers, automotive body electronics, security and access systems, and instrumentation front-ends. The wide I/O count of 33 also makes it useful for LED display controllers and keypad-scanning human-machine interfaces.
When designing with the PIC17C44-25E/P, ensure the external oscillator network matches the device's 25 MHz rating - a crystal oscillator or ceramic resonator with proper loading capacitors is required. Because this is an OTP (One-Time-Programmable) part, firmware must be fully verified before final programming; there is no field re-programmability.
This page synthesizes XAIPART distributor pricing, same-brand drop-in alternatives within the PIC17C family, and practical design considerations not found in the manufacturer datasheet.
直接替换替代料： PIC17C44-25E/P ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC17C44-25E/P （相同外形与封装尺寸） ——差异在于 Program Memory Size, Mounting Type, Program Memory Type, RAM Size, Package.
快速对比工具——选择替代料号进行并排对比：
PIC17C44-33E/P
✅ 直接替换✓ 有现货
$7.85 / 个
查看数据手册 →PIC17C44-25I/P
✅ 直接替换✓ 有现货
$10.3 / 个
查看数据手册 →PIC17C43-25E/PT
✅ 直接替换✓ 有现货
$10.85 / 个
查看数据手册 →PIC17C43-16E/P
✅ 直接替换✓ 有现货
$8.4 / 个
查看数据手册 →PIC17C44-25E/P 最大额定值与电气特性
| Product Family | PIC17C4X |
| Core Architecture | 8-bit PIC RISC |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 16 KB (8K x 16) |
| RAM Size | 454 bytes |
| Data EEPROM | Not present |
| 最大时钟频率 | 25 MHz |
| Instruction Execution Rate | 8.25 MIPS (121 ns/instruction) |
| Number of I/O Pins | 33 |
| Number of Instructions | 58 (single-word) |
| Hardware Stack Depth | 8 levels |
| Capture/Compare/PWM Modules | 4 |
| USART | 1 (hardware addressable) |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| 工作温度范围 | -40C to +85C (extended, "E" suffix) |
| 封装 | 40-pin PDIP (Plastic DIP, "P" suffix) |
| 安装类型 | Through-hole (DIP) |
| RoHS 状态 | unknown |
| Lead-Free | unknown |
| Oscillator Type | External (crystal/resonator) |
PIC17C44-25E/P 引脚配置
| 引脚 1 | RA0 — PORTA bit 0 (digital I/O or analog input AN0) |
| 引脚 2 | RA1 — PORTA bit 1 (digital I/O or analog input AN1) |
| 引脚 3 | RA2 — PORTA bit 2 (digital I/O or analog input AN2) |
| 引脚 4 | RA3 — PORTA bit 3 (digital I/O or analog input AN3) |
| 引脚 5 | RA4/RTCC — PORTA bit 4 / RTCC I/O |
| 引脚 6 | RA5 — PORTA bit 5 / analog input AN4 |
| 引脚 7 | RA6 — PORTA bit 6 / analog input AN5 |
| 引脚 8 | RA7 — PORTA bit 7 / analog input AN6 |
| 引脚 9 | RB0/INT — PORTB bit 0 / external interrupt |
| 引脚 10 | RB1 — PORTB bit 1 |
| 引脚 11 | RB2 — PORTB bit 2 |
| 引脚 12 | RB3 — PORTB bit 3 |
| 引脚 13 | RB4 — PORTB bit 4 |
| 引脚 14 | RB5 — PORTB bit 5 |
| 引脚 15 | RB6 — PORTB bit 6 / in-circuit debugger |
| 引脚 16 | RB7 — PORTB bit 7 / in-circuit debugger |
| 引脚 17 | RC0 — PORTC bit 0 |
| 引脚 18 | RC1 — PORTC bit 1 |
| 引脚 19 | RC2 — PORTC bit 2 |
| 引脚 20 | RC3 — PORTC bit 3 |
| 引脚 21 | RC4 — PORTC bit 4 |
| 引脚 22 | RC5 — PORTC bit 5 |
| 引脚 23 | RC6 — PORTC bit 6 |
| 引脚 24 | RC7 — PORTC bit 7 |
| 引脚 25 | VSS — Ground |
| 引脚 26 | VDD — Positive supply |
| 引脚 27 | RD0 — PORTD bit 0 (PSPMODE) |
| 引脚 28 | RD1 — PORTD bit 1 (PSPMODE) |
| 引脚 29 | RD2 — PORTD bit 2 (PSPMODE) |
| 引脚 30 | RD3 — PORTD bit 3 (PSPMODE) |
| 引脚 31 | RD4 — PORTD bit 4 (PSPMODE) |
| 引脚 32 | RD5 — PORTD bit 5 (PSPMODE) |
| 引脚 33 | RD6 — PORTD bit 6 (PSPMODE) |
| 引脚 34 | RD7 — PORTD bit 7 (PSPMODE) |
| 引脚 35 | RE0/RD/AN5 — PORTE bit 0 / read signal / analog |
| 引脚 36 | RE1/WR/AN6 — PORTE bit 1 / write signal / analog |
| 引脚 37 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog |
| 引脚 38 | OSC1/CLKIN — External clock input / crystal pin 1 |
| 引脚 39 | OSC2/CLKOUT — External clock output / crystal pin 2 |
| 引脚 40 | MCLR/VPP — Master clear / programming voltage |
典型应用
PIC17C44-25E/P 适用于 7 应用s: Industrial Motor Control, Appliance Controllers, Automotive Body Electronics, Keypad and HMI Scanners, Security and Access Control Systems, Test and Measurement Front-Ends, LED Display Controllers.
Industrial Motor Control
The PIC17C44-25E/P suits industrial motor control systems via its four on-chip Capture/Compare/PWM modules and 33 I/O pins. Each CCP drives a PWM channel at up to 25 MHz instruction throughput - 8.25 MIPS - giving a 1.2 microsecond PWM resolution, more than adequate for variable-frequency drives below 50 kHz switching. The 16-bit wide program path and 58 single-word instructions simplify closed-loop control loops in C or assembly. Pairing with external H-bridge drivers such as the IR2104 or HIP4086 lets one PIC17C44 coordinate two-quadrant or four-quadrant motor control.
推荐
Appliance Controllers
Home-appliance controllers (washing machines, dishwashers, microwave ovens) commonly used the PIC17C44 for its 16 KB OTP program memory and 454-byte RAM, sufficient for state machines and keypad scanning. The 33 I/O pins drove 7-segment displays, sensor inputs, and relay outputs without external muxing. EEPROM emulation in flash-free OTP requires creative use of unused program memory pages - a well-documented Microchip technique. For new appliance designs the migration target is PIC18F45K22 flash MCU in the same 40-pin PDIP footprint.
推荐
Automotive Body Electronics
Original PIC17C44 designs served in body-electronic modules (window lifters, seat controllers, instrument clusters) where the OTP-only memory met cost targets and the extended -40C to +85C industrial temp range covered cabin environments. The four PWM channels and addressable USART enable CAN/LIN-style multiplexing via external transceivers. Today such designs migrate to PIC18F or dsPIC30/33 flash parts - example the dsPIC33EP64GP504-E/MV - which add CAN hardware and flash re-programmability that the OTP PIC17C44 cannot provide.
推荐
Keypad and HMI Scanners
The PIC17C44-25E/P's 33 I/O lines can scan 4x4 keypads with 16 keys or larger 8x8 matrices without external encoder chips. Eight-level hardware stack and 121 ns instruction cycle permit fast debounce and chattering correction. Pair with LED or LCD drivers such as the HC595 shift register to expand output count cost-effectively. Migration path: PIC18F4520 or PIC18F45K22 with the same 40-pin PDIP footprint, providing flash and more RAM as of 2026-09-25.
推荐
Security and Access Control Systems
Access controllers and alarm panels used the PIC17C44 to drive keypads, magnetic-stripe readers, and relay outputs via its 33 GPIOs and one USART. 16 KB OTP program memory was sufficient for proprietary protocol stacks (Wiegand, mag-stripe, sensor fusion), and the 454-byte RAM supported event buffers. Hardware addressable USART simplified multi-drop RS-485 polling. Modern replacements are PIC18F or dsPIC parts with flash memory so firmware can be updated in the field as of 2026-09-25.
推荐
Test and Measurement Front-Ends
The PIC17C44-25E/P embedded its 8-bit ADC (11 channels, per datasheets.com) into instrumentation front-ends: multimeters, panel meters, process controllers. Hardware stack of 8 plus interrupts at 8.25 MIPS lets the MCU service ADC and UART simultaneously without missing samples. Combined with op-amp front ends such as the MCP6022 and 4-20 mA loop drivers, one PIC17C44 served as a complete sensor-conditioning MCU. Migration target for new designs is the dsPIC33 family with 12-bit ADC and 70 MIPS throughput.
推荐
LED Display Controllers
Multiplexed 7-segment and dot-matrix LED displays benefit from the PIC17C44-25E/P's 33 GPIOs and four CCP/PWM channels, which drive row scanning and brightness modulation in software or hardware PWM. Sustained row-refresh rates above 200 Hz are easy at 8.25 MIPS, eliminating visible flicker. Charlieplexing with 33 lines can address up to 528 individual LEDs; in practice 16-32 segments are typical. Modern migration: PIC18F45K22 flash MCU with PWM and CLC peripherals for hardware Charlieplex as of 2026-09-25.
推荐
推荐产品汇总
工程参考数据： PIC17C44-25E/P ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC17C44-33E/P | PIC17C44-25I/P | PIC17C43-25E/P | PIC17C43-16E/P |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-40 | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) |
| Max Clock Frequency | 25 MHz | 33 MHz (+32%) | 25 MHz (same) | 25 MHz (same) | 16 MHz (-36%) |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Extended (-40C/+85C) | Extended | Industrial (different suffix, "I" vs "E") | Extended | Extended |
| Lifecycle | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
关键差异点
- Higher clock speed at same footprint （对比 PIC17C44-33E/P)
- Same memory map and pinout, slightly different instruction count （对比 PIC17C43-25E/P)
- Slower speed grade, same package （对比 PIC17C43-16E/P)
设计说明
Place the bypass capacitor (typically 0.1 uF ceramic) as close as possible to VDD pin 26 and VSS pin 25 of the 40-pin PDIP PIC17C44-25E/P. With 25 MHz oscillation, internal switching events can corrupt analog ADC readings if supply rail noise exceeds 50 mV; the local decoupling cap is mandatory. Add a bulk 10 uF tantalum or aluminum electrolytic cap within 1 cm of the package to handle transient current drawn by PORTB drivers.
PIC17C44-25E/P is OTP (One-Time-Programmable). Once programmed, the firmware cannot be changed - plan production firmware validation rigorously before programming a lot. Also note that the standard ceramic package ("/P") is not directly interchangeable with the J-lead LCC package ("/L") despite shared silicon; pin ordering differs. Estimated lead-time for legacy OTP stock through 2026 distribution: 12-26 weeks depending on how much inventory remains at franchised distributors.
At 25 MHz the PIC17C44's PORTB drivers have 20 ns rise/fall times, producing edge rates that can couple into adjacent analog inputs. Keep digital traces away from the analog AN0-AN6 inputs on PORTA; use a ground guard trace between digital and analog sections on the PCB. For PWM outputs (CCP1-CCP4) keep traces short and add 33 ohm series resistors to dampen ringing when driving long cables, particularly in industrial motor-control wiring.
合规信息
Compliance status not present in verified web data; verify with manufacturer datasheet DS30412C or Microchip product page before specifying for new designs. The /P suffix historically denotes PDIP without guaranteed lead-free status - confirm with distributor documentation at time of order.
