PIC17C44-33/PQ - 33MHz 8-bit OTP MCU, 16KB, 44-MQFP | Microchip
Артикул: PIC17C44-33/PQ ✗ Снят с производства| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $12.5 | $12,50 |
| 10 | $11.2 | $112,00 |
| 100 | $9.85 | $985,00 |
| 500 | $8.75 | $4.375,00 |
| 1.000 | $7.95 | $7.950,00 |
PIC17C44-33/PQ Обзор
Background knowledge: an 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, and peripherals around an 8-bit data bus; the PIC architecture family in particular follows a RISC instruction set with a fixed-width instruction word. The PIC17C family sits above the baseline PIC16C line and adds a wider instruction word, more addressing modes, a hardware multiplier, and higher throughput, while remaining object-code compatible with the earlier PIC17C42A die. OTP (One-Time Programmable) EPROM-based variants like the PIC17C44 are intended for volume production where the firmware is finalized at assembly time, unlike flash-based parts that can be re-programmed in the field.
Key features of the PIC17C44-33/PQ include 58 single-word instructions, a 16-level hardware stack, four 8-bit I/O ports (PORTA through PORTD, plus a partial PORTE), two 8-bit timers plus one 16-bit timer with capture/compare/PWM capability, a USART with addressable mode, and a watchdog timer with its own on-chip RC oscillator. The 33 MHz speed grade ('-33') specifies the maximum oscillator input; the device also offers -16 and -25 MHz speed grades. An in-circuit serial programming (ICSP) interface and a 14-bit instruction width round out the feature set.
Typical applications include industrial control panels, embedded instrumentation, motor-control front-end boards, point-of-sale terminals, and legacy embedded products designed around the PIC17C architecture. Per the manufacturer product page, Microchip explicitly recommends the PIC18F442 as the recommended migration path for new designs.
When designing with the PIC17C44-33/PQ, observe the brown-out reset voltage threshold and ensure the OTP programming voltage profile matches the Microchip programming specification; the device is in a Metric QFP package so PCB land pattern must match JEDEC MO-108. Decoupling should follow Microchip's PIC17C family reference design with a 0.1 microfarad ceramic capacitor per supply pin.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes for legacy PIC17C44 designs not found in the original manufacturer datasheet.
Аналоги без доработки для PIC17C44-33/PQ — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с PIC17C44-33/PQ (тот же форм-фактор и посадочное место) — отличается по Package, Timers, Program Memory Size, Core, Maximum Clock Frequency.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
PIC17C44-25I/PQ
✅ Прямая замена✓ В наличии
$9.85 / шт.
Открыть даташит →PIC17C44-16I/PQ
✅ Прямая замена✓ В наличии
$15.5 / шт.
Открыть даташит →PIC17C43T-25I/PQ
✅ Прямая замена✓ В наличии
$13.5 / шт.
Открыть даташит →PIC17C43T-25/PQ
✅ Прямая замена✓ В наличии
$8.1 / шт.
Открыть даташит →PIC17C43-16I/PQ
✅ Прямая замена✓ В наличии
$4.82 / шт.
Открыть даташит →PIC17C44-33/PQ Максимальные параметры и электрические характеристики
| Manufacturer | Microchip Technology |
| Series | PIC 17C |
| Core | PIC |
| Core Size | 8-bit |
| Instruction Set Architecture | RISC, 58 single-word instructions |
| Program Memory Type | OTP (One-Time Programmable EPROM) |
| Program Memory Size | 16 KB (8K x 16 words) |
| RAM Size | 454 bytes |
| Максимальная тактовая частота | 33 MHz |
| Instruction Execution Time | 121 ns (8.25 MIPS at 33 MHz) |
| Напряжение питания | 5 V |
| Number of I/O Pins | 33 |
| Package Type | 44-pin Metric Quad Flat Pack (MQFP) |
| Тип монтажа | Surface Mount |
| Timers | 2 x 8-bit, 1 x 16-bit Timer/Counter with CCP |
| Communication Interfaces | USART (addressable mode), ICSP |
| Hardware Stack | 16 levels |
| Peripherals | Watchdog Timer with on-chip RC oscillator, Brown-out Reset |
| Статус RoHS | unknown |
Конфигурация выводов PIC17C44-33/PQ
| Контакт 1 | RA0/AN0 — PORTA bit 0 / analog input |
| Контакт 2 | RA1/AN1 — PORTA bit 1 / analog input |
| Контакт 3 | RA2/AN2 — PORTA bit 2 / analog input |
| Контакт 4 | RA3/AN3 — PORTA bit 3 / analog input |
| Контакт 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Контакт 6 | RA5 — PORTA bit 5 |
| Контакт 7 | VSS — Ground |
| Контакт 8 | OSC1/CLKI — Oscillator input / external clock |
| Контакт 9 | OSC2/CLKO — Oscillator output |
| Контакт 10 | MCLR/VPP — Master clear / programming voltage |
| Контакт 11 | VSS — Ground |
| Контакт 12 | RB0/INT — PORTB bit 0 / external interrupt |
| Контакт 13 | RB1 — PORTB bit 1 |
| Контакт 14 | RB2 — PORTB bit 2 |
| Контакт 15 | RB3 — PORTB bit 3 |
| Контакт 16 | RB4 — PORTB bit 4 |
| Контакт 17 | RB5 — PORTB bit 5 |
| Контакт 18 | RB6 — PORTB bit 6 / ICSP clock |
| Контакт 19 | RB7 — PORTB bit 7 / ICSP data |
| Контакт 20 | VSS — Ground |
| Контакт 21 | RC0 — PORTC bit 0 |
| Контакт 22 | RC1 — PORTC bit 1 |
| Контакт 23 | RC2 — PORTC bit 2 |
| Контакт 24 | RC3 — PORTC bit 3 |
| Контакт 25 | RD0 — PORTD bit 0 |
| Контакт 26 | RD1 — PORTD bit 1 |
| Контакт 27 | RD2 — PORTD bit 2 |
| Контакт 28 | RD3 — PORTD bit 3 |
| Контакт 29 | RC4 — PORTC bit 4 |
| Контакт 30 | RC5 — PORTC bit 5 |
| Контакт 31 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Контакт 32 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Контакт 33 | RD4 — PORTD bit 4 |
| Контакт 34 | RD5 — PORTD bit 5 |
| Контакт 35 | RD6 — PORTD bit 6 |
| Контакт 36 | RD7 — PORTD bit 7 |
| Контакт 37 | RE0 — PORTE bit 0 |
| Контакт 38 | RE1 — PORTE bit 1 |
| Контакт 39 | RE2 — PORTE bit 2 |
| Контакт 40 | VDD — Positive supply |
| Контакт 41 | VDD — Positive supply |
| Контакт 42 | VSS — Ground |
| Контакт 43 | NC — Not connected (per datasheet) |
| Контакт 44 | NC — Not connected (per datasheet) |
Типичное применение
PIC17C44-33/PQ подходит для 6 применениеs: Industrial Control Panels, Embedded Instrumentation and Data Acquisition, Point-of-Sale Terminals and Keypad Interfaces, Motor-Control Front-End Boards, Legacy Embedded Products (Long-Life Maintenance), Educational and Trainer Boards.
Industrial Control Panels
The PIC17C44-33/PQ is well-suited for industrial control panels that require deterministic 8-bit performance and rugged 5 V CMOS I/O. Its 33 MHz / 8.25 MIPS throughput easily drives keypad scanning, LED multiplexing, and relay drive firmware at tight cycle budgets, while the 16 KB OTP holds substantial state-machine code with comfortable headroom. The 33 GPIO are sufficient for parallel LCD, seven-segment clusters, and discrete contact monitoring. Place 0.1 uF ceramic decoupling on every VDD/VSS pair and follow Microchip's reference EMI layout for the PIC17C family to pass industrial EMC tests.
Рекомендуется
Embedded Instrumentation and Data Acquisition
The PIC17C44-33/PQ's 33 MHz throughput, 454 bytes of RAM, and 8-bit ADC-friendly I/O make it a strong match for low-channel-count embedded instrumentation. With a 121 ns instruction cycle, the part can service high-rate sensor sampling, digital filtering, and UART reporting on a single chip, while the addressable USART simplifies RS-485 multi-drop sensor networks. The 16 KB OTP is sufficient for calibration tables and protocol stacks. Add an external op-amp front end and a precision voltage reference for 16-bit-class measurement performance.
Рекомендуется
Point-of-Sale Terminals and Keypad Interfaces
The PIC17C44-33/PQ was a workhorse of 1990s-era POS terminals where deterministic scan loops and the addressable USART simplified multi-drop peripheral wiring. Its 33 GPIO easily handle 4x5 matrix keypads, 16-character vacuum-fluorescent displays, and serial peripherals, while the 16 KB OTP stores menu logic and transaction handlers. The hardware 16-level depth supports deeply nested ISRs common in keypad-debounce routines. Plan OTP-window mask revision for any late-stage firmware changes because OTP cannot be re-programmed.
Рекомендуется
Motor-Control Front-End Boards
For stepper and small BLDC motor front-end boards, the PIC17C44-33/PQ delivers the deterministic interrupt latency and on-board timers needed for commutation sequencing. The 16-bit timer with capture/compare/PWM can drive FET bridges directly via PWM output, while the 33 GPIO support Hall-sensor inputs, fault inputs, and enable signals. The 8.25 MIPS throughput handles trapezoidal commutation tables with overhead to spare for current-limit protection. A 5 V supply rail simplifies gate-driver interface design.
Рекомендуется
Legacy Embedded Products (Long-Life Maintenance)
Many long-life products - medical, aerospace ground-support, and industrial automation - still require the PIC17C44-33/PQ because their firmware is OTP-validated and re-certification costs would exceed redesign. The PIC17C44's 5 V tolerance, mature datasheet, and Microchip's lifetime-buy policy make it a viable maintenance part. Heisener lists 7,616 pieces in stock as of 2026-09-25, enough for many support runs. Engineers should buffer stock per forecast, then plan a phased migration to PIC18F442 for future revisions.
Рекомендуется
Educational and Trainer Boards
The PIC17C44-33/PQ is a popular choice for university curricula and embedded-systems trainers that target the PIC 17C architecture specifically. Its 33 MHz / 8.25 MIPS specification, 16 KB OTP program memory, and 33 I/O pins give students a fully featured 8-bit platform with a real-world instruction cycle and 14-bit instruction width to study. Many existing PIC17C44 trainer boards have reference designs and lab manuals online, reducing the upfront curriculum investment. Pair with the MPLAB ICD2/3 for OTP programming during lab exercises.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для PIC17C44-33/PQ — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | PIC17C44-25I/PQ | PIC17C44-16I/PQ | PIC17C43T-25I/PQ | PIC17C43T-25/PQ | PIC17C43-16I/PQ |
|---|---|---|---|---|---|---|
| Package | MQFP-44 (PQ) | MQFP-44 (PQ) - same | MQFP-44 (PQ) - same | MQFP-44 (PQ) - same | MQFP-44 (PQ) - same | MQFP-44 (PQ) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Max Clock Frequency | 33 MHz | 25 MHz | 16 MHz | 25 MHz | 25 MHz | 16 MHz |
| Program Memory | 16 KB OTP | 16 KB OTP - same | 16 KB OTP - same | 8 KB OTP | 8 KB OTP | 8 KB OTP |
| I/O Pins | 33 | 33 - same | 33 - same | 33 | 33 | 33 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Ключевые отличия
- Highest speed grade in the PIC17C44 family (против PIC17C44-25I/PQ)
- Doubles program memory versus PIC17C43 siblings (против PIC17C43-16I/PQ)
- Manufacturer-recommended migration to PIC18F442 (not pin-compatible) (против PIC18F442)
Заметки по проектированию
The PIC17C44-33/PQ operates from a single 5 V supply; place a 0.1 uF ceramic decoupling capacitor on every VDD/VSS pair (pins 7, 11, 20, 40, 41, 42) within 5 mm of the package. Add a bulk 10 uF tantalum on the board-level supply rail. According to Microchip PIC17C family reference designs, shared supply noise degrades ADC accuracy and USART reliability; star-ground the analog and digital returns where possible.
The 44-pin MQFP package has 0.8 mm lead pitch and gull-wing terminations on all four sides. According to JEDEC MO-108, the land pattern should be slightly wider than the lead foot to allow fillet formation but not so wide that bridging occurs at reflow. Hand-soldering the MQFP-44 is possible but rework stations with hot air and flux are strongly recommended. Keep trace length under 25 mm to MCLR to avoid noise-induced resets.
OTP memory cannot be re-programmed - any firmware bug discovered after programming is permanent. According to Microchip, always verify firmware on a windowed PIC17C44JW prototype before OTP production. Brown-out reset threshold is factory-trimmed but can be disabled in configuration fuses; verify the fuse setting matches application requirements. Programming voltage VPP on MCLR must follow Microchip's programming spec to avoid device damage.
Route the oscillator traces (OSC1/OSC2) short and surrounded by a ground guard ring to minimize EMI coupling. Place the crystal load capacitors immediately adjacent to the OSC pins, not near the supply pins. For 33 MHz operation, keep total oscillator trace capacitance under 20 pF including the IC pin capacitance. According to the Microchip PIC17C44 datasheet, oscillator stability directly affects USART baud-rate accuracy.
Информация о соответствии
RoHS, REACH, lead-free, and halogen-free status not stated in the verified web data for this obsolete 5 V OTP-era part. Confirm with Microchip for specific lot codes if compliance is required. AEC-Q100 is not applicable to legacy OTP PIC17C44 family devices.
