PIC17C44-25I/P - 8-Bit 25MHz 16KB OTP MCU 40-PDIP | Microchip
Référence : PIC17C44-25I/P ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 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 Présentation
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.
Alternatives de remplacement direct pour PIC17C44-25I/P — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec PIC17C44-25I/P (même facteur de forme et même empreinte) — différant par Package, Program Memory Size, Program Memory Type, Core Architecture, Mounting Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC17C44-16I/PQ
✅ Remplacement direct✓ En stock
$15.5 / unité
Voir la fiche technique →PIC17C44-16I/PQ
✅ Remplacement direct✓ En stock
$15.5 / unité
Voir la fiche technique →PIC17C44-16I/PT
✅ Remplacement direct✓ En stock
$4.65 / unité
Voir la fiche technique →PIC17C43-25I/PQ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PIC17C43-16I/PT
✅ Remplacement direct✓ En stock
$5.3 / unité
Voir la fiche technique →PIC17C44-25I/P Valeurs maximales et caractéristiques électriques
| 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 |
| Fréquence d'horloge maximale | 25 MHz |
| Largeur du bus de données | 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 |
| Boîtier | 40-pin PDIP (P) |
| Plage de température de fonctionnement | -40C to +85C (Industrial, I suffix) |
| Type de montage | Through-Hole |
Configuration des broches de PIC17C44-25I/P
| Broche 1 | RA0/AN0 — PORTA bit 0 / analog input |
| Broche 2 | RA1/AN1 — PORTA bit 1 / analog input |
| Broche 3 | RA2/AN2 — PORTA bit 2 / analog input |
| Broche 4 | RA3/AN3 — PORTA bit 3 / analog input |
| Broche 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Broche 6 | RA5/SS — PORTA bit 5 / SPI slave select |
| Broche 7 | RA6/OSC2 — PORTA bit 6 / oscillator output |
| Broche 8 | RA7/OSC1 — PORTA bit 7 / oscillator input |
| Broche 9 | RB0/INT — PORTB bit 0 / external interrupt |
| Broche 10 | RB1 — PORTB bit 1 |
| Broche 11 | RB2 — PORTB bit 2 |
| Broche 12 | RB3 — PORTB bit 3 |
| Broche 13 | RB4 — PORTB bit 4 |
| Broche 14 | RB5 — PORTB bit 5 |
| Broche 15 | RB6 — PORTB bit 6 / ICP |
| Broche 16 | RB7 — PORTB bit 7 |
| Broche 17 | RC0 — PORTC bit 0 |
| Broche 18 | RC1 — PORTC bit 1 |
| Broche 19 | RC2 — PORTC bit 2 |
| Broche 20 | RC3 — PORTC bit 3 |
| Broche 21 | RC4 — PORTC bit 4 |
| Broche 22 | RC5 — PORTC bit 5 |
| Broche 23 | RC6 — PORTC bit 6 |
| Broche 24 | RC7 — PORTC bit 7 |
| Broche 25 | RD0 — PORTD bit 0 |
| Broche 26 | RD1 — PORTD bit 1 |
| Broche 27 | RD2 — PORTD bit 2 |
| Broche 28 | RD3 — PORTD bit 3 |
| Broche 29 | RD4 — PORTD bit 4 |
| Broche 30 | RD5 — PORTD bit 5 |
| Broche 31 | RD6 — PORTD bit 6 |
| Broche 32 | RD7 — PORTD bit 7 |
| Broche 33 | RE0 — PORTE bit 0 |
| Broche 34 | RE1 — PORTE bit 1 |
| Broche 35 | RE2 — PORTE bit 2 |
| Broche 36 | VSS — Ground |
| Broche 37 | VDD — Positive supply (4.5 V to 6 V) |
| Broche 38 | NC — Not connected (per datasheet) |
| Broche 39 | NC — Not connected (per datasheet) |
| Broche 40 | MCLR — Master clear (reset) input |
Applications typiques
PIC17C44-25I/P convient pour 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC17C44-25I/P — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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) |
Principaux différenciateurs
- 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))
Notes de conception
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.
Informations de conformité
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.
