PIC17C44-25E/PQ - 8-Bit 25MHz OTP MCU, 16KB, 44-MQFP | Microchip
Référence : PIC17C44-25E/PQ ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.4 | $8,40 |
| 10 | $7.5 | $75,00 |
| 100 | $6.4 | $640,00 |
| 500 | $5.5 | $2 750,00 |
| 1 000 | $4.95 | $4 950,00 |
PIC17C44-25E/PQ Présentation
What is a PIC17C microcontroller? The PIC17C is Microchip's mid-1990s high-end 8-bit MCU family that extended the classic PIC16C instruction set with additional instructions, multiple interrupt vectors, hardware multiply, and an external program/data bus interface. PIC17C devices sit in the hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> PIC architecture -> Microchip PIC family. They were the first PIC family to expose an external memory bus and to provide hardware peripheral features that later became standard on PIC18F devices.
Key features of the PIC17C44-25E/PQ include 16 KB of OTP program memory (organized as 8K x 16 instruction words), 454 bytes of general-purpose RAM, 33 digital I/O pins, an external oscillator interface, and a wide 4.5V to 6.0V supply range. The "25E" suffix denotes the 25 MHz maximum clock and the Extended (industrial) temperature grade. The "PQ" suffix denotes the 44-pin Metric Quad Flat Package.
The PIC17C44 uses Microchip's classic two-stage pipeline and Harvard architecture, with separate program and data buses. Each instruction is 16 bits wide and most execute in a single 121 ns cycle at 25 MHz, giving 8.25 MIPS sustained throughput. The wide OTP program word (16 bits) increases code density relative to 14-bit PIC16C devices. OTP memory is one-time programmable, suitable for production runs where firmware is finalized.
Typical applications for the PIC17C44-25E/PQ include industrial control boards, embedded sensor interfaces, motor control peripherals, and legacy replacement designs originally built around the PIC17C4X platform. The part is also used in instrumentation front-ends, security panels, and telecom line-interface modules where the original PIC17C firmware was qualified. Designers often select it to maintain firmware and PCB compatibility with installed PIC17C44 systems.
When designing with the PIC17C44, ensure the oscillator source can deliver a clean, jitter-free 25 MHz clock and that the 5V rail stays within the 4.5V to 6.0V supply window. The OTP window is one-time only, so firmware must be fully validated before programming. For new designs, Microchip recommends migrating to the PIC18F442 family, which is source-code compatible and offers in-circuit reprogrammability (Flash).
This page synthesizes distributor pricing, parameter cross-checks against the Microchip datasheet, and pin-compatible replacement guidance not found in the original datasheet PDF.
Alternatives de remplacement direct pour PIC17C44-25E/PQ — 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 PIC17C44-25E/PQ (même facteur de forme et même empreinte) — différant par Program Memory Size, RAM Size, Program Memory Type, Package, Maximum Clock Frequency.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC17C44-25I/PQ
✅ Remplacement direct✓ En stock
$9.85 / unité
Voir la fiche technique →PIC17C44-25/PQ
✅ Remplacement direct✓ En stock
$7.55 / unité
Voir la fiche technique →PIC17C44T-25E/PQ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PIC17C44T-25I/PQ
✅ Remplacement direct✓ En stock
$8.45 / unité
Voir la fiche technique →PIC17C42A-33I/PQ
✅ Remplacement direct✓ En stock
$11.4 / unité
Voir la fiche technique →PIC17C44-25E/PQ Valeurs maximales et caractéristiques électriques
| Core Architecture | PIC 8-bit Harvard |
| Family | PIC17C |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 16 KB (8K x 16 instructions) |
| RAM Size | 454 x 8 bits |
| Fréquence d'horloge maximale | 25 MHz |
| Instruction Execution Time | 121 ns (8.25 MIPS) |
| Instruction Set Width | 16 bits |
| Number of I/O Pins | 33 |
| Oscillator Type | External |
| Supply Voltage (Vdd) | 4.5 V to 6.0 V |
| Température de fonctionnement | -40C to +125C (Extended "E" grade) |
| Boîtier / Format | 44-MQFP (Metric Quad Flat Package, PQ) |
| Type de montage | Surface Mount |
| Nombre de broches | 44 |
| Tube Packaging | Yes |
Configuration des broches de PIC17C44-25E/PQ
| Broche 1 | RA0 — PORTA bit 0 (digital I/O) |
| Broche 2 | RA1 — PORTA bit 1 (digital I/O) |
| Broche 3 | RA2 — PORTA bit 2 (digital I/O) |
| Broche 4 | RA3 — PORTA bit 3 (digital I/O) |
| Broche 5 | RA4 — PORTA bit 4 (digital I/O / Timer0) |
| Broche 6 | RA5 — PORTA bit 5 (digital I/O) |
| Broche 7 | VSS — Ground reference |
| Broche 8 | OSC1 — External oscillator input |
| Broche 9 | OSC2 — External oscillator output |
| Broche 10 | MCLR — Master Clear (reset, active low) |
| Broche 11 | VDD — Positive supply (4.5V-6.0V) |
| Broche 12 | RB0 — PORTB bit 0 (digital I/O / external interrupt) |
| Broche 13 | RB1 — PORTB bit 1 (digital I/O) |
| Broche 14 | RB2 — PORTB bit 2 (digital I/O) |
| Broche 15 | RB3 — PORTB bit 3 (digital I/O) |
| Broche 16 | RB4 — PORTB bit 4 (digital I/O) |
| Broche 17 | RB5 — PORTB bit 5 (digital I/O) |
| Broche 18 | RB6 — PORTB bit 6 (digital I/O / PG clock) |
| Broche 19 | RB7 — PORTB bit 7 (digital I/O / PG data) |
| Broche 20 | VSS — Ground reference |
| Broche 21 | RC0 — PORTC bit 0 (digital I/O) |
| Broche 22 | RC1 — PORTC bit 1 (digital I/O) |
| Broche 23 | RC2 — PORTC bit 2 (digital I/O / PWM1) |
| Broche 24 | RC3 — PORTC bit 3 (digital I/O / PWM2) |
| Broche 25 | RC4 — PORTC bit 4 (digital I/O) |
| Broche 26 | RC5 — PORTC bit 5 (digital I/O) |
| Broche 27 | RC6 — PORTC bit 6 (digital I/O / TX) |
| Broche 28 | RC7 — PORTC bit 7 (digital I/O / RX) |
| Broche 29 | RD0 — PORTD bit 0 (digital I/O / external memory bus) |
| Broche 30 | RD1 — PORTD bit 1 (digital I/O / external memory bus) |
| Broche 31 | RD2 — PORTD bit 2 (digital I/O / external memory bus) |
| Broche 32 | RD3 — PORTD bit 3 (digital I/O / external memory bus) |
| Broche 33 | RD4 — PORTD bit 4 (digital I/O / external memory bus) |
| Broche 34 | RD5 — PORTD bit 5 (digital I/O / external memory bus) |
| Broche 35 | RD6 — PORTD bit 6 (digital I/O / external memory bus) |
| Broche 36 | RD7 — PORTD bit 7 (digital I/O / external memory bus) |
| Broche 37 | VSS — Ground reference |
| Broche 38 | RE0 — PORTE bit 0 (digital I/O / external memory control) |
| Broche 39 | RE1 — PORTE bit 1 (digital I/O / external memory control) |
| Broche 40 | RE2 — PORTE bit 2 (digital I/O / external memory control) |
| Broche 41 | VDD — Positive supply (4.5V-6.0V) |
| Broche 42 | RF0 — PORTF bit 0 (digital I/O) |
| Broche 43 | RF1 — PORTF bit 1 (digital I/O) |
| Broche 44 | RF2 — PORTF bit 2 (digital I/O) |
Applications typiques
PIC17C44-25E/PQ convient pour 6 applications: Industrial Control Boards, Embedded Sensor Interface Modules, Motor Control Peripherals, Legacy Firmware Replacement Designs, Instrumentation Front-Ends, Telecom Line-Interface Modules.
Industrial Control Boards
The PIC17C44-25E/PQ fits industrial control boards thanks to its 8.25 MIPS throughput at 25 MHz, 33 I/O pins for parallel sensor and actuator interfaces, and Extended -40C to +125C temperature grade. In a typical PLC-style I/O board, the MCU scans 16 to 24 discrete inputs, drives relay or transistor outputs, and runs a control loop in firmware - all within the 16 KB OTP code budget. Designers favor the PQ package for hand-soldered prototype boards; for volume production, the same die is offered in PT (TQFP) and L (PLCC). The 5V supply matches legacy industrial 24V-to-5V regulated rails. Trade-off: OTP memory is one-time programmable, so production firmware changes require a new mask or new chips - consider PIC18F452 for in-field firmware updates.
Recommandé
Embedded Sensor Interface Modules
The PIC17C44-25E/PQ is well suited to embedded sensor interface modules that need 33 digital I/O lines and reliable 8-bit arithmetic at industrial temperatures. In a typical multi-signal acquisition front-end, the MCU polls 8 to 16 analog channels via an external ADC, formats data over UART or SPI, and stores calibration in 454 bytes of RAM. The 25 MHz / 121 ns instruction cycle handles tight interrupt-driven sampling loops. The 44-MQFP (PQ) footprint makes it easy to route all 33 I/O without via-stacking. For designs that need more code space, the PIC17C44 family has no larger-memory sibling - migrate to PIC18F452 if 16 KB is insufficient.
Recommandé
Motor Control Peripherals
The PIC17C44-25E/PQ supports small motor control peripherals such as stepper sequencers, brushed DC PWM drivers, and BLDC commutation controllers, where 8.25 MIPS at 25 MHz delivers deterministic timing for commutation loops. In a typical stepper driver board, the MCU generates step/direction pulses, reads end-stop and encoder inputs, and runs open-loop acceleration ramps. The 33 I/O pins map directly to one or two H-bridge signals plus encoder channels. Extended temperature grade supports under-hood or cabinet-mounted installations. Power dissipation is dominated by external drivers, not the MCU itself, so the 5V rail can stay at modest current. For higher-power BLDC, migrate to dsPIC30 or PIC32MK families.
Recommandé
Legacy Firmware Replacement Designs
The PIC17C44-25E/PQ is the canonical drop-in choice for legacy firmware replacement designs that were originally qualified on the PIC17C4X platform. Engineers maintaining fielded products that were built around PIC17C44 silicon can use this part to repair, refurbish, or build small production runs without re-qualifying firmware or PCBs. The 16 KB OTP code space accommodates the original PIC17C44 binary, and the 44-MQFP (PQ) footprint matches the original PCB land pattern. The Extended temperature grade covers most industrial and outdoor installations. Caveat: because OTP is one-time programmable, production firmware changes require a new wafer mask - for ongoing firmware evolution, plan migration to Flash-based PIC18F or dsPIC families.
Recommandé
Instrumentation Front-Ends
The PIC17C44-25E/PQ is found in instrumentation front-ends such as bench-top multimeters, panel meters, and process signal conditioners where deterministic 8-bit control and modest I/O count are sufficient. In a typical 4-digit panel meter, the MCU reads an ADC, drives a 7-segment or LCD display via the 33 I/O lines, and implements a linearization table in the 454-byte RAM. The 121 ns instruction cycle supports fast ADC polling rates, and the 5V supply rail matches most signal-conditioning op-amps. The Extended temperature grade allows outdoor panel mounting. For designs that need USB, CAN, or more memory, the PIC18F452 is the natural successor.
Recommandé
Telecom Line-Interface Modules
The PIC17C44-25E/PQ was widely deployed in telecom line-interface modules during the 1990s, including SLIC control, ring-detection circuits, and PBX line cards. The 33 I/O pins map directly to multi-line SLIC supervision, the Extended temperature grade handles outdoor cabinet environments, and the 8.25 MIPS throughput runs HDLC or simplified serial protocols. Modern replacements have shifted to DSP and ARM-based controllers, but fielded PIC17C44 designs remain in service worldwide. The part's continued availability through distributors (per DigiKey, Heisener, Octopart listings) supports maintenance of these legacy systems. New telecom designs should consider dsPIC or PIC32 families for integrated DSP and Ethernet.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC17C44-25E/PQ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PIC17C44-25I/PQ | PIC17C44-25/PQ | PIC17C44T-25E/PQ | PIC17C44T-25I/PQ | PIC17C42A-33I/PQ |
|---|---|---|---|---|---|---|
| Package | 44-MQFP (PQ) | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Size | 16 KB OTP (8K x 16) | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 4 KB OTP (-75%) |
| Maximum Clock Frequency | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 33 MHz (+32%) |
| Operating Temperature | -40C to +125C (Extended) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Packaging Carrier | Tube | Tube | Tube | Tape & Reel | Tape & Reel | Tube |
| Supply Voltage | 4.5V to 6.0V | 4.5V to 6.0V | 4.5V to 6.0V | 4.5V to 6.0V | 4.5V to 6.0V | 4.5V to 6.0V |
| RAM Size | 454 x 8 | 454 x 8 | 454 x 8 | 454 x 8 | 454 x 8 | 454 x 8 |
Principaux différenciateurs
- Highest program memory in PIC17C4X family (16 KB OTP) (vs PIC17C42A-33I/PQ)
- Extended -40C to +125C temperature grade for harsh environments (vs PIC17C44-25I/PQ)
- Tube packaging suited for prototype and low-volume production (vs PIC17C44T-25E/PQ)
Notes de conception
The PIC17C44-25E/PQ requires a stable 4.5V to 6.0V supply. Place a 100 nF decoupling capacitor as close as possible to each VDD pin (pins 11 and 41) and a bulk 10 uF tantalum or aluminum electrolytic capacitor at the board's power entry. The PIC17C family's high-speed external oscillator draws transient current spikes that can corrupt analog supplies - keep digital VDD separate from analog rails if the board mixes analog and digital sections. Add a 10 kohm pull-up on the MCLR pin (pin 10) to prevent spurious resets during power-up brown-out events. The 5V-only operation means a 3.3V system cannot use this part directly; level shifters are required for mixed-voltage designs.
Lay out the 44-MQFP (PQ) footprint with all 33 I/O traces routed away from the oscillator pins (8, 9, 10) to avoid coupling noise into the external clock. Place the 25 MHz crystal or resonator within 1 cm of OSC1/OSC2, with a grounded guard ring around the oscillator traces. The 44-MQFP body is 10x10 mm with 0.8 mm lead pitch - use NSMD (non-soldermask-defined) pads for reliable paste release during reflow. Add thermal vias under the exposed die-attach pad (if present on this PQ variant) to improve heat dissipation. Keep all I/O traces short and away from analog signal paths to minimize digital switching noise.
Three common pitfalls when designing with the PIC17C44-25E/PQ: (1) OTP memory is one-time programmable - once a chip is programmed, the firmware cannot be erased, debugged, or updated. Validate firmware completely with a windowed or Flash prototype (e.g., PIC17C44 JW or PIC18F442) before committing to OTP production. (2) The Extended "E" temperature grade covers -40C to +125C, while the Industrial "I" grade is -40C to +85C - selecting the wrong grade for outdoor or under-hood applications causes field failures. (3) The 5V-only supply rules out direct interface to 3.3V peripherals; always verify peripheral logic compatibility before designing in this part. For new designs, Microchip recommends PIC18F442 as the Flash-based, in-circuit-reprogrammable successor.
Informations de conformité
The PIC17C44-25E/PQ is an obsolete Microchip part from the 1990s PIC17C OTP family. RoHS, REACH, lead-free, halogen-free, and conflict-minerals compliance status are not specified in the verified data and require direct manufacturer inquiry. The 'E' suffix denotes Extended industrial temperature grade, not AEC-Q100 automotive qualification - this part is not AEC-Q100 qualified.
