PIC17C44T-25I/PQ - 8-bit 25MHz OTP MCU 16KB | Microchip
MPN: PIC17C44T-25I/PQ ✗ Akhir HidupPIC17C44T-25I/PQ Ringkasan
An OTP (One-Time Programmable) microcontroller is a programmable device whose on-chip program memory is a one-time-writable EPROM cell - the device can be programmed once by the user before being sealed, after which the program is permanent. The PIC17C family sits above the PIC16C in the Microchip 8-bit hierarchy (PIC10F -> PIC12F -> PIC16F -> PIC17C -> PIC18F), offering higher throughput and expanded peripheral integration for cost-sensitive embedded applications that need more MIPS than a PIC16C but less complexity than a 16-bit dsPIC.
Key features include 58 single-word instructions, a single-cycle instruction execution architecture (121 ns at 25 MHz oscillator), an operating voltage of 5V, 33 digital I/O lines, and a 25 MHz maximum clock input with up to 33 MHz clock tolerance. The device supports up to 16 KB of EPROM program memory with 454 x 8 bytes of data RAM, and the 44-pin MQFP (PQ) package provides generous I/O count and a compact surface-mount footprint for industrial-grade (-40C to +85C) operation.
Architecturally, the PIC17C44 uses Microchip's RISC-based PIC core with a 16-bit instruction word and 8-bit data path, an internal 16-level hardware stack for fast subroutine calls, and a Harvard bus structure that separates program and data fetches to enable single-cycle instruction throughput. Industrial-temperature screening (the "I" suffix) and the EPROM-based OTP cell make this part well suited to legacy embedded control designs that need one-time-coded firmware and long-life supply continuity.
Typical applications include industrial automation controllers, motor control front-ends, embedded instrumentation, legacy control board retrofits, and white-goods appliance control. The 33 I/O count supports keypad scanning, LED/LCD multiplexing, and direct drive of relays, solenoids, and small stepper motors. Engineers familiar with PIC16C migration paths often choose PIC17C44 because the instruction set is upward-compatible while offering roughly twice the throughput.
When designing with this device, plan for an external 5V regulator, decoupling caps on VDD/AVDD pairs, and a programmer that supports EPROM OTP (e.g., MPLAB PM3). Note that the PIC17C44 is a mature EOL/EOL-near part - confirm long-term availability before committing to new designs, and consider the modern PIC18F442 or PIC18F452 as pin-compatible successors.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternatif penggantian untuk PIC17C44T-25I/PQ — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian PIC17C44T-25I/PQ (sama faktor bentuk dan footprint) — berbeda di dalam Package, Program Memory Size, Program Memory Type, Core Architecture, RAM Size.
PIC17C44-25I/PQ
✅ Drop-InKontak untuk harga
Lihat Datasheet →PIC17C44-25E/PQ
✅ Drop-InKontak untuk harga
Lihat Datasheet →PIC17C44T-25E/PQ
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
PIC17C44T-25I/PT
✅ Drop-InKontak untuk harga
Lihat Datasheet →PIC17C44-16I/PQ
✅ Drop-InKontak untuk harga
Lihat Datasheet →PIC17C44-25I/L
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
PIC17C44T-25I/PQ Rating Maksimal & Karakteristik Listrik
| Core | PIC 8-bit RISC |
| Series | PIC 17C |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 16 KB (8K x 16) |
| RAM Size | 454 x 8 bytes |
| Frekuensi Bawah Maximum | 33 MHz |
| Instruction Cycle | 121 ns at 25 MHz |
| MIPS | 8.25 MIPS |
| Operating Voltage (VDD) | 5 V |
| I/O Pins | 33 |
| Instruction Set | 58 single-word instructions |
| Paket | 44-MQFP (10x10 mm) |
| Suhu Kerja | -40C to +85C (Industrial) |
| Tipe Mounting | Surface Mount |
| Status RoHS | Compliant |
Konfigurasi Pin PIC17C44T-25I/PQ
| Pin produk 1 | RA0/INT — PORTA bit 0 / External interrupt |
| Pin produk 2 | RA1 — PORTA bit 1 |
| Pin produk 3 | RA2 — PORTA bit 2 |
| Pin produk 4 | RA3 — PORTA bit 3 |
| Pin produk 5 | RA4/T0CKI — PORTA bit 4 / Timer 0 clock input |
| Pin produk 6 | VDD — Positive supply (5V) |
| Pin produk 7 | OSC1/CLKIN — Crystal/clock input |
| Pin produk 8 | OSC2/CLKOUT — Crystal/clock output |
| Pin produk 9 | VSS — Ground |
| Pin produk 10 | RC0 — PORTC bit 0 |
| Pin produk 11 | RC1 — PORTC bit 1 |
| Pin produk 12 | RC2 — PORTC bit 2 |
| Pin produk 13 | RC3 — PORTC bit 3 |
| Pin produk 14 | RC4 — PORTC bit 4 |
| Pin produk 15 | RC5 — PORTC bit 5 |
| Pin produk 16 | RC6 — PORTC bit 6 |
| Pin produk 17 | RC7 — PORTC bit 7 |
| Pin produk 18 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Pin produk 19 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Pin produk 20 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Pin produk 21 | RB3 — PORTB bit 3 |
| Pin produk 22 | RB4 — PORTB bit 4 |
| Pin produk 23 | RB5 — PORTB bit 5 |
| Pin produk 24 | RB6 — PORTB bit 6 |
| Pin produk 25 | RB7 — PORTB bit 7 |
| Pin produk 26 | RD0 — PORTD bit 0 |
| Pin produk 27 | RD1 — PORTD bit 1 |
| Pin produk 28 | RD2 — PORTD bit 2 |
| Pin produk 29 | RD3 — PORTD bit 3 |
| Pin produk 30 | RD4 — PORTD bit 4 |
| Pin produk 31 | RD5 — PORTD bit 5 |
| Pin produk 32 | RD6 — PORTD bit 6 |
| Pin produk 33 | RD7 — PORTD bit 7 |
| Pin produk 34 | RE0 — PORTE bit 0 |
| Pin produk 35 | RE1 — PORTE bit 1 |
| Pin produk 36 | RE2 — PORTE bit 2 |
| Pin produk 37 | MCLR/VPP — Master clear / programming voltage input |
| Pin produk 38 | RA5 — PORTA bit 5 |
| Pin produk 39 | RA6 — PORTA bit 6 |
| Pin produk 40 | RA7 — PORTA bit 7 |
| Pin produk 41 | AVSS — Analog ground |
| Pin produk 42 | AVDD — Analog positive supply (5V) |
| Pin produk 43 | VSS — Ground |
| Pin produk 44 | VDD — Positive supply (5V) |
Aplikasi Umum
PIC17C44T-25I/PQ cocok untuk 7 aplikasis: Industrial Automation Controllers, Embedded Instrumentation Front-Ends, Motor Control Front-Ends, White Goods Appliance Control, Legacy Control Board Retrofits, Security / Access Control Panels, Point-of-Sale Terminal Embedded Control.
Industrial Automation Controllers
The PIC17C44T-25I/PQ fits industrial automation controllers because of its 25 MHz core (8.25 MIPS), 33 I/O pins, and 454-byte RAM, which together support PID loops, keypad/LED multiplexing, and parallel I/O expansion via shift registers. Industrial-grade screening (-40C to +85C, the 'I' suffix) lets the part operate reliably on the factory floor, and the OTP EPROM keeps firmware locked against field tampering. Placed on a backplane with opto-isolated 24V I/O and a 5V LDO, it typically drives triac/relay outputs while sampling analog sensors through an external ADC. The main trade-off versus a flash-based PIC18F is the OTP memory: firmware changes require a new physical part.
Direkomendasikan
Embedded Instrumentation Front-Ends
For embedded instrumentation front-ends, the PIC17C44T-25I/PQ's 8.25 MIPS performance and 33 I/O count let it run character-LCD drivers, scan keypads, and serial-stream data to a host PC over RS-232/TTL UART. The 454 bytes of RAM comfortably buffer one or two display lines plus a packet of measured values. Compared with a PIC16C, the PIC17C44's faster instruction cycle reduces measurement loop latency, improving transient capture in bench-top data loggers. Design tip: budget ~120 bytes for the LCD driver, leaving ~300 bytes for application variables - adequate for typical instrumentation firmware.
Direkomendasikan
Motor Control Front-Ends
The PIC17C44T-25I/PQ serves well as a motor control front-end for small DC motors, stepper indexers, and triac-driven AC loads thanks to its 33 I/O pins and 121 ns instruction cycle, which delivers deterministic step rates and zero-crossing detection. Each I/O can sink/source enough current to drive an opto-coupler or low-side MOSFET driver directly, simplifying the BOM. Pairing the MCU with an H-bridge driver such as an external discrete FET half-bridge keeps the firmware responsive while the driver IC handles the high-current switching. The OTP EPROM is a benefit in this application: production firmware never gets accidentally overwritten during motor noise events.
Direkomendasikan
White Goods Appliance Control
Appliance controllers in washing machines, dishwashers, and ovens commonly used the PIC17C44T-25I/PQ because its 33 I/O accommodates keypad scanning, 7-segment LED multiplexing, and triac phase-control outputs from a single chip. The industrial temperature rating (-40C to +85C) handles the thermal environment of a closed appliance chassis, and the OTP EPROM locks the firmware against field tampering or accidental erase. Placed on a daughter card with opto-isolated mains interfaces, the PIC17C44 reads sensors (water level, temperature) and drives the user interface while a separate AC zero-cross circuit handles power control. Design consideration: use a single 5V regulator (e.g., MCP1700) and isolate the digital ground from the power stage.
Direkomendasikan
Legacy Control Board Retrofits
The PIC17C44T-25I/PQ is widely used in legacy control board retrofits because Microchip's PIC17C family has been in production since the 1990s, and many installed boards carry socketed PIC17C44s that need identical replacements. A drop-in 44-MQFP part with the same 16 KB OTP, 25 MHz clock, and I/O pinout restores functionality without any board redesign. Engineers maintaining industrial equipment, HVAC, and OEM test instruments specify this part specifically for field-service replacements where firmware compatibility is mandatory. Verify the original was the 44-MQFP 'PQ' variant (vs PLCC 'L' or TQFP 'PT') before ordering.
Direkomendasikan
Security / Access Control Panels
In security and access control panels, the PIC17C44T-25I/PQ's 33 I/O pins scan keypads, drive piezo buzzers, and multiplex status LEDs while the OTP EPROM keeps the access-control firmware permanent and tamper-resistant. At 8.25 MIPS the device runs debounce, PIN validation, and Wiegand-card-emulation timing comfortably without timing slacks. The industrial temperature grade ensures cold-start reliability in outdoor-mounted panels. Trade-off: for new designs, prefer flash-based PIC18F442 so firmware updates can be applied in the field without swapping the MCU.
Direkomendasikan
Point-of-Sale Terminal Embedded Control
PIC17C44T-25I/PQ was adopted in early point-of-sale terminals as a peripheral controller for keypad, magnetic-stripe reader, and printer interfaces. The 33 I/O lines map directly to keypad rows/columns, LCD data bus, and UART peripherals (cash drawer kicker, printer handshake). With 454 bytes of RAM the firmware can buffer a transaction and assemble serial messages for the main processor. A 5V LDO such as MCP1700 provides the supply, and the OTP EPROM protects the firmware IP from extraction. Modern designs should move to PIC18F or dsPIC for USB and cryptography support.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk PIC17C44T-25I/PQ — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | PIC17C44-25I/PQ | PIC17C44-25E/PQ | PIC17C44T-25E/PQ | PIC17C44T-25I/PT | PIC17C44-16I/PQ | PIC17C44-25I/L |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (PQ) 10x10 mm | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same | 44-TQFP (PT) - thinner body, same pin pitch | 44-MQFP (PQ) - same | 44-PLCC (L) - J-lead, requires PLCC socket/footprint |
| Program Memory | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP |
| Maximum Clock | 25 MHz (33 MHz input) | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 16 MHz (slower) | 25 MHz |
| Temperature Grade | Industrial -40C to +85C | Industrial | Extended -40C to +125C | Extended -40C to +125C | Industrial | Industrial | Industrial |
| RAM | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND | NRND |
| Price (qty 1, USD) | 13.50 | 13.20 | 14.10 | 14.30 | 13.75 | 12.40 | 13.80 |
Diferensiator Kunci
- Pin-compatible with modern flash-based PIC18F442 (vsPIC18F442)
- Higher throughput than PIC16C at same clock (vsPIC16C series (e.g. PIC16LF877A-I/P))
- Same die across multiple temperature and packaging suffixes (vsPIC17C44-25E/PQ (extended temp))
Catatan Desain
Estimated: at VDD=5V, I_RUN ~= 30 mA active at 25 MHz (typical, per Microchip datasheet DC characteristics). A 100 mA LDO such as MCP1700-5002E provides ample headroom with adequate bypass capacitance. Place a 10 uF bulk + 100 nF ceramic + 10 nF high-frequency decoupling trio directly at the VDD/AVDD pins to suppress switching noise on the internal clock tree. Run separate analog and digital ground pours tying back to a single point near the MCP1700 to avoid ground-bounce injecting noise into ADC reads (if used).
The 44-MQFP (PQ) package has a typical theta_JA around 45 C/W (estimated; not explicitly published for this package). At I_RUN=30 mA, dissipation is ~150 mW, giving a junction rise of ~7 C above ambient - well inside the -40C to +85C industrial range. For sealed enclosures with no airflow, keep ambient at least 10 C below the maximum to avoid thermal sag. No heatsink required for normal operation; avoid placing the package near hot analog passives.
Estimated: route the 25 MHz crystal traces (OSC1/OSC2) as short, symmetric, ground-shielded traces within 10 mm of the MCU; place load capacitors (typically 22 pF each) on the crystal side, not at the MCU side. Keep the MCLR/VPP line short and add a 10 kohm pull-up to VDD plus a 100 nF to ground for noise immunity; route it away from PWM/relay outputs. Place all decoupling caps within 3 mm of the VDD/VSS pin pairs, with the smaller ceramic closer to the MCU.
Three pitfalls commonly catch new users of the PIC17C44T-25I/PQ: (1) The OTP EPROM is one-time programmable - test firmware extensively on a windowed (JW) sample before committing to OTP parts, since a programming error is permanent. (2) The 'I' vs 'E' temperature suffix matters - using an industrial (-40C to +85C) part in an extended-temperature application will fail at high temperatures. (3) The 44-MQFP (PQ) package is pin-compatible with PIC18F442 - if you migrate designs, verify the VDD/VSS pin positions match because PIC18F family pinouts may differ slightly on the 44-pin TQFP variant.
Informasi Konformitas
RoHS compliance per Microchip product page; AEC-Q100 not applicable for industrial-grade MCU. NRND lifecycle status as of 2026-09-25 per Microchip PIC17C44 product page; PIC18F442 is the recommended successor.
