PIC17C44-25I/P - 8-Bit 25MHz 16KB OTP MCU 40-PDIP | Microchip
MPN: PIC17C44-25I/P ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.5 | $16.50 |
| 10 | $14.85 | $148.50 |
| 100 | $13.2 | $1,320.00 |
| 500 | $11.55 | $5,775.00 |
| 1,000 | $10.3 | $10,300.00 |
PIC17C44-25I/P Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral I/O on one die. The PIC17C family sits at the high end of Microchip's 8-bit hierarchy (PIC10/12/16/17/18), delivering up to 8.25 MIPS performance with a RISC instruction set. The PIC17C44 belongs to the broader embedded microcontroller category within semiconductor ICs, sitting below application processors but above simple discrete logic in capability.
Key differentiating specifications include the 25 MHz operating frequency (equivalent to a 121 ns instruction cycle), 16 KB of OTP program memory organized as 8K x 16 words, and a wide 33 I/O count for parallel control applications. The device uses an external clock source and supports interrupt-driven operation with multiple peripheral interfaces typical of the PIC17C series.
The PIC17C44 is built on Microchip's CMOS EPROM/ROM process with the PIC17C RISC core, providing faster execution than the earlier PIC16 family while maintaining source-level compatibility with PIC mid-range assembly. Its OTP memory allows one-time field programming for production units, while windowed CERDIP variants (JW package) support development and prototyping with UV erasure.
Typical applications include industrial control systems, motor control interfaces, embedded data acquisition, and legacy equipment maintenance. The 33 I/O count suits parallel keypad scanning, LED multiplexing, and discrete logic replacement in factory automation. The OTP memory model is well-matched to mature production designs where firmware is finalized.
When designing with this part, verify supply voltage stays within 4.5 V to 6 V and provide adequate decoupling on VDD pins. Note that the PIC17C44 is a mature/legacy product; Microchip recommends the PIC18F442 as the modern migration path, although pinout compatibility is not guaranteed. Plan a board-level migration if long-term availability is critical.
This page synthesizes distributor pricing, same-family alternatives, and practical migration notes for the PIC17C44-25I/P that the bare manufacturer datasheet does not provide.
Drop-in alternatives for PIC17C44-25I/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 PIC17C44-25I/P (same form factor and footprint) — differing in Package, Program Memory Size, Program Memory Type, Core Architecture, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C44-16I/PQ
✅ Drop-In✓ In Stock
$15.5 / Unit
View Datasheet →PIC17C44-16I/PQ
✅ Drop-In✓ In Stock
$15.5 / Unit
View Datasheet →PIC17C44-16I/PT
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC17C43-25I/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C43-16I/PT
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC17C44-25I/P Maximum Ratings & Electrical Characteristics
| Core | PIC 8-bit RISC |
| Program Memory Type | OTP (One-Time-Programmable EPROM) |
| Program Memory Size | 16 KB (8K x 16 words) |
| RAM Size | 454 bytes |
| CPU Speed (MIPS) | 8.25 MIPS |
| Instruction Cycle Time | 121 ns |
| Maximum Clock Frequency | 25 MHz |
| Data Bus Width | 16-bit (instruction), 8-bit (data) |
| Supply Voltage (VDD) | 4.5 V to 6 V |
| I/O Pins | 33 |
| Instruction Set | 58 single-word instructions |
| Package | 40-pin PDIP (P) |
| Operating Temperature Range | -40C to +85C (Industrial, I suffix) |
| Mounting Type | Through-Hole |
PIC17C44-25I/P Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / analog input |
| Pin 2 | RA1/AN1 — PORTA bit 1 / analog input |
| Pin 3 | RA2/AN2 — PORTA bit 2 / analog input |
| Pin 4 | RA3/AN3 — PORTA bit 3 / analog input |
| Pin 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 6 | RA5/SS — PORTA bit 5 / SPI slave select |
| Pin 7 | RA6/OSC2 — PORTA bit 6 / oscillator output |
| Pin 8 | RA7/OSC1 — PORTA bit 7 / oscillator input |
| 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 / ICP |
| Pin 16 | RB7 — PORTB bit 7 |
| 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 | RD0 — PORTD bit 0 |
| Pin 26 | RD1 — PORTD bit 1 |
| Pin 27 | RD2 — PORTD bit 2 |
| Pin 28 | RD3 — PORTD bit 3 |
| Pin 29 | RD4 — PORTD bit 4 |
| Pin 30 | RD5 — PORTD bit 5 |
| Pin 31 | RD6 — PORTD bit 6 |
| Pin 32 | RD7 — PORTD bit 7 |
| Pin 33 | RE0 — PORTE bit 0 |
| Pin 34 | RE1 — PORTE bit 1 |
| Pin 35 | RE2 — PORTE bit 2 |
| Pin 36 | VSS — Ground |
| Pin 37 | VDD — Positive supply (4.5 V to 6 V) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | MCLR — Master clear (reset) input |
Typical Applications
PIC17C44-25I/P is suitable for 6 applications: Industrial Control Systems, Motor Control and Drive Interfaces, Embedded Data Acquisition, Legacy Equipment Maintenance and Repair, Discrete Logic Replacement, Prototyping with PIC17C Architecture.
Industrial Control Systems
The PIC17C44-25I/P's 8.25 MIPS performance, 33 I/O count, and -40C to +85C industrial temperature range make it well-suited for factory-floor PLCs, machine controllers, and process automation. With 16 KB of OTP program memory, the device can host real-time control loops, sequencing logic, and Modbus/serial protocol stacks for legacy industrial networks. The 25 MHz clock and 121 ns instruction cycle provide deterministic interrupt response for time-critical control tasks, while the 33 I/O pins comfortably drive parallel keypad scanning, LED multiplexing, and discrete relay/transistor outputs typical of factory automation. The 4.5 V to 6 V supply aligns with 5 V industrial backplanes.
Recommended
Motor Control and Drive Interfaces
The PIC17C44-25I/P's 8.25 MIPS throughput and 33 I/O lines suit low-to-mid-speed motor control interface designs, including brushed DC and unipolar stepper drive sequencing. Its 25 MHz clock produces a 121 ns instruction cycle that comfortably handles PWM generation, commutation timing, and encoder feedback sampling for sub-kW drives. The 16 KB OTP program memory holds reference ramp tables, commutation state machines, and fault-handling routines, while 454 bytes of RAM accommodate PWM duty registers and encoder counters. Industrial -40C to +85C temperature and 5 V supply ease integration into motor-driver cabinets.
Recommended
Embedded Data Acquisition
The PIC17C44-25I/P fits 8-bit embedded data acquisition front-ends that require parallel I/O expansion and moderate processing throughput. Its 33 I/O count accommodates multiplexed analog-front-end channel selection, sensor excitation switching, and parallel LCD or keypad interfaces, while the 25 MHz clock and 8.25 MIPS deliver the throughput for sample averaging, scaling, and serial uplink formatting. The 16 KB OTP program memory fits lookup tables, calibration constants, and simple protocol stacks. Industrial temperature operation supports deployment in panel-mounted measurement equipment and instrumentation.
Recommended
Legacy Equipment Maintenance and Repair
The PIC17C44-25I/P is principally deployed in maintenance and repair of legacy equipment originally designed around the PIC17C family. Its NRND lifecycle status means the part remains orderable for sustaining engineering but is not recommended for new designs. The 40-pin PDIP through-hole package simplifies hand-soldering and field replacement on older PCBs that were laid out for DIP footprints. The 25 MHz industrial-grade variant matches original equipment specifications 1:1, allowing drop-in board-level replacement without firmware changes when migrating to lower-speed same-package parts.
Recommended
Discrete Logic Replacement
The PIC17C44-25I/P can consolidate discrete 74-series logic, latches, and glue logic into a single programmable MCU, reducing PCB area and BOM cost. Its 33 I/O pins replace multiple 8-bit and 16-bit logic devices, while the 16 KB OTP memory stores lookup tables that emulate combinational and sequential logic functions. The 121 ns instruction cycle produces deterministic input-to-output latency comparable to fast bipolar logic families, making the part suitable for high-speed custom logic replacement. This application pattern was common in 1990s industrial designs and remains relevant for legacy sustainment programs.
Recommended
Prototyping with PIC17C Architecture
The PIC17C44-25I/P's 40-pin PDIP through-hole form factor and industrial temperature range make it practical for breadboard and thru-hole prototype development of PIC17C-family firmware. Engineers building prototypes for migration planning can use the part to validate code paths, peripheral drivers, and timing budgets before committing to surface-mount PIC18F production hardware. The 25 MHz maximum clock and 16 KB OTP provide enough headroom for prototype firmware features including interrupt service routines and serial-protocol stacks. Microchip's PIC17C architecture is fully supported by legacy MPLAB toolchains.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C44-25I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C44-16I/P | PIC17C44-16I/PQ | PIC17C44-16I/PT | PIC17C43-25I/PQ | PIC17C43-16I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP (P) | 40-pin PDIP - same | 40-pin PDIP - same | 44-pin TQFP | 44-pin MQFP/PQ | 44-pin TQFP |
| Maximum Clock Frequency | 25 MHz | 16 MHz (-36%) | 16 MHz (-36%) | 16 MHz (-36%) | 25 MHz (same) | 16 MHz (-36%) |
| Program Memory | 16 KB OTP | 16 KB OTP (same) | 16 KB OTP (same) | 16 KB OTP (same) | 8 KB OTP (-50%) | 8 KB OTP (-50%) |
| RAM Size | 454 bytes | 454 bytes (same) | 454 bytes (same) | 454 bytes (same) | 454 bytes (same) | 454 bytes (same) |
| I/O Pins | 33 | 33 (same) | 33 (same) | 33 (same) | 33 (same) | 33 (same) |
| Operating Temperature Range | -40C to +85C (Industrial) | -40C to +85C (same) | -40C to +85C (same) | -40C to +85C (same) | -40C to +85C (same) | -40C to +85C (same) |
| Lifecycle Status | NRND (Not Recommended for New Designs) | NRND (same family) | NRND (same family) | NRND (same family) | NRND (same family) | NRND (same family) |
Key Differentiators
- 25 MHz maximum clock speed (vs PIC17C44-16I/P)
- 16 KB OTP program memory (8K x 16) (vs PIC17C43-25I/PQ)
- 40-pin PDIP through-hole package (vs PIC17C44-16I/PT)
- Industrial -40C to +85C temperature range (vs PIC17C44-25/PT (commercial))
Design Notes
The PIC17C44-25I/P operates from a regulated 4.5 V to 6 V supply; place 100 nF ceramic decoupling capacitors close to each VDD pin and a bulk 10 uF to 47 uF tantalum or electrolytic capacitor on the supply rail. The 5 V rail is typical; 3.3 V systems will not work with this 5 V part. Verify that any analog references used by the MCU are clean, since the PIC17C44 has no internal voltage regulator and is directly exposed to supply noise.
Do not exceed the absolute maximum VDD of 7 V or operate below 4.5 V, as the EPROM program memory may corrupt or fail to read correctly. The MCLR pin requires a proper reset network (typically 10 kohm pull-up to VDD with a 100 nF capacitor to ground) to ensure clean reset behavior on power-up and brown-out. Confirm oscillator start-up with the chosen crystal or resonator; the PIC17C44 datasheet recommends specific load capacitor values for each frequency range.
Route the OSC1/OSC2 traces short and symmetrically to ground to minimize EMI and clock jitter. Keep high-speed digital I/O traces away from analog input pins (RA0-RA3 on this PIC17C44) if analog functionality is used. The 40-pin PDIP has no internal ground plane; add a ground pour on the bottom layer to reduce digital switching noise coupling into the analog inputs.
Because the PIC17C44-25I/P uses One-Time-Programmable (OTP) EPROM, firmware bugs cannot be fixed by re-programming the device in the field. Use a windowed CERDIP (JW package) variant during development to allow UV erasure, and finalize firmware before committing to the PDIP production part. Plan for the recommended PIC18F442 migration if long-term field-update capability is required, since PIC18F parts use flash memory with in-circuit reprogrammability.
Compliance Information
Compliance flags not explicitly stated in verified web data. PDIP package traditionally uses lead-bearing termination; RoHS status requires confirmation from Microchip's latest material declaration. AEC-Q100 not applicable for this industrial-grade legacy MCU. Recommended migration part PIC18F442 should be checked for full RoHS/REACH compliance.
