PIC17C44-25E/P - 8-Bit 25MHz CMOS OTP MCU 16KB | Microchip
MPN: PIC17C44-25E/P ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 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 Overview
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.
Drop-in alternatives for PIC17C44-25E/P — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC17C44-25E/P (same form factor and footprint) — differing in Program Memory Size, Mounting Type, Program Memory Type, RAM Size, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C44-33E/P
✅ Drop-In✓ In Stock
$7.85 / Unit
View Datasheet →PIC17C44-25I/P
✅ Drop-In✓ In Stock
$10.3 / Unit
View Datasheet →PIC17C43-25E/PT
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →PIC17C43-16E/P
✅ Drop-In✓ In Stock
$8.4 / Unit
View Datasheet →PIC17C44-25E/P Maximum Ratings & Electrical Characteristics
| 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 |
| Maximum Clock Frequency | 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 |
| Operating Temperature Range | -40C to +85C (extended, "E" suffix) |
| Package | 40-pin PDIP (Plastic DIP, "P" suffix) |
| Mounting Type | Through-hole (DIP) |
| RoHS Status | unknown |
| Lead-Free | unknown |
| Oscillator Type | External (crystal/resonator) |
PIC17C44-25E/P Pin Configuration
| Pin 1 | RA0 — PORTA bit 0 (digital I/O or analog input AN0) |
| Pin 2 | RA1 — PORTA bit 1 (digital I/O or analog input AN1) |
| Pin 3 | RA2 — PORTA bit 2 (digital I/O or analog input AN2) |
| Pin 4 | RA3 — PORTA bit 3 (digital I/O or analog input AN3) |
| Pin 5 | RA4/RTCC — PORTA bit 4 / RTCC I/O |
| Pin 6 | RA5 — PORTA bit 5 / analog input AN4 |
| Pin 7 | RA6 — PORTA bit 6 / analog input AN5 |
| Pin 8 | RA7 — PORTA bit 7 / analog input AN6 |
| Pin 9 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 10 | RB1 — PORTB bit 1 |
| Pin 11 | RB2 — PORTB bit 2 |
| Pin 12 | RB3 — PORTB bit 3 |
| Pin 13 | RB4 — PORTB bit 4 |
| Pin 14 | RB5 — PORTB bit 5 |
| Pin 15 | RB6 — PORTB bit 6 / in-circuit debugger |
| Pin 16 | RB7 — PORTB bit 7 / in-circuit debugger |
| Pin 17 | RC0 — PORTC bit 0 |
| Pin 18 | RC1 — PORTC bit 1 |
| Pin 19 | RC2 — PORTC bit 2 |
| Pin 20 | RC3 — PORTC bit 3 |
| Pin 21 | RC4 — PORTC bit 4 |
| Pin 22 | RC5 — PORTC bit 5 |
| Pin 23 | RC6 — PORTC bit 6 |
| Pin 24 | RC7 — PORTC bit 7 |
| Pin 25 | VSS — Ground |
| Pin 26 | VDD — Positive supply |
| Pin 27 | RD0 — PORTD bit 0 (PSPMODE) |
| Pin 28 | RD1 — PORTD bit 1 (PSPMODE) |
| Pin 29 | RD2 — PORTD bit 2 (PSPMODE) |
| Pin 30 | RD3 — PORTD bit 3 (PSPMODE) |
| Pin 31 | RD4 — PORTD bit 4 (PSPMODE) |
| Pin 32 | RD5 — PORTD bit 5 (PSPMODE) |
| Pin 33 | RD6 — PORTD bit 6 (PSPMODE) |
| Pin 34 | RD7 — PORTD bit 7 (PSPMODE) |
| Pin 35 | RE0/RD/AN5 — PORTE bit 0 / read signal / analog |
| Pin 36 | RE1/WR/AN6 — PORTE bit 1 / write signal / analog |
| Pin 37 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog |
| Pin 38 | OSC1/CLKIN — External clock input / crystal pin 1 |
| Pin 39 | OSC2/CLKOUT — External clock output / crystal pin 2 |
| Pin 40 | MCLR/VPP — Master clear / programming voltage |
Typical Applications
PIC17C44-25E/P is suitable for 7 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C44-25E/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Higher clock speed at same footprint (vs PIC17C44-33E/P)
- Same memory map and pinout, slightly different instruction count (vs PIC17C43-25E/P)
- Slower speed grade, same package (vs PIC17C43-16E/P)
Design Notes
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.
Compliance Information
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.
