PIC17C43T-33I/PQ - 8KB OTP 8-bit MCU 33MHz 44-MQFP | Microchip
MPN： PIC17C43T-33I/PQ ⚠ 最後購買機會PIC17C43T-33I/PQ 概覽
An 8-bit microcontroller is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one die. Within the broader taxonomy, the PIC17C43 belongs to the 8-bit MCU class -> microcontroller -> embedded controller -> semiconductor. Compared with PIC16C5X/PIC16CXX predecessors, the PIC17C family adds an expanded instruction set, larger memory addressing, and additional peripheral integration, making it suitable for higher-end embedded applications than baseline PIC16 devices can address.
Key features include a Harvard architecture with separate program and data buses, multiple power-saving modes, selectable oscillator options (crystal/ceramic resonator), and a versatile interrupt controller supporting both internal and external interrupt sources. The 33 MHz clock yields the 121 ns instruction cycle that powers 8.25 MIPS throughput, while the OTP program memory provides flexible in-system reprogrammability during prototyping and small-batch production. The 33I/PQ suffix indicates 33 MHz speed, industrial temperature, tape-and-reel packaging, and the 44-pin MQFP plastic package.
Typical applications include industrial control loops, motor control front-ends, automotive body/comfort subsystems (predecessor grade), consumer appliance controllers, security panel logic, and general-purpose 8-bit embedded platforms where a balance of throughput, ROM density, and I/O count is required. Its PIC17 heritage gives drop-in compatibility with designs migrated from PIC16CXX or earlier PIC17C42 systems.
One important design consideration: Microchip has officially flagged the PIC17C43 as a legacy device and recommends the PIC18F4220 as a newer alternative. Engineers building new products should evaluate the PIC18F family for additional features, flash memory, and ongoing support, while still sourcing PIC17C43T-33I/PQ for existing design maintenance and production continuity.
This PIC17C43T-33I/PQ product page synthesizes distributor availability, MQFP-package drop-in alternatives from the same PIC17C family, and practical design notes not aggregated on the manufacturer datasheet itself, helping engineers and procurement teams evaluate lifecycle risk and second-source options in a single view.
直接替換替代品，適用於 PIC17C43T-33I/PQ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC17C43T-33I/PQ （相同外形與佔位） — 差異在於 Timers, Mounting Type, Package, Core Architecture, Instruction Cycle Time.
PIC17C43-33I/PQ
✅ 直接替換📋 參考替代品（不在目錄中）
PIC17C43T-16/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC17C43T-25I/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC17C43T-25E/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC17C43T-25/PQ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC17C43T-33E/PQ
✅ 直接替換📋 參考替代品（不在目錄中）
PIC17C43T-33I/PQ 最大額定值與電氣特性
| Product Family | PIC® 17C |
| Core Architecture | 8-bit RISC (PIC17C) |
| Program Memory Type | OTP (One-Time Programmable EPROM) |
| Program Memory Size | 8 KB (4K x 16) |
| RAM Size | 454 bytes |
| 最大時脈頻率 | 33 MHz |
| Instruction Cycle | 121 ns (single-cycle, 2-cycle for branches/table reads-writes) |
| Throughput | 8.25 MIPS |
| Number of Instructions | 58 single-word instructions |
| 供應電壓 | 5 V |
| I/O Pins | 33 (typical for 44-MQFP PIC17C43) |
| 封裝 | 44-MQFP (10x10 mm), Plastic, Surface Mount |
| 工作溫度 | -40C to +85C (Industrial) |
| Temperature Grade | Industrial |
| 安裝類型 | Surface Mount (Gull Wing) |
| Terminal Form | Gull Wing |
PIC17C43T-33I/PQ 腳位配置
| 腳位 1 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| 腳位 2 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| 腳位 3 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| 腳位 4 | RA3/AN3 — PORTA bit 3 / analog input 3 |
| 腳位 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| 腳位 6 | RA5/AN4 — PORTA bit 5 / analog input 4 |
| 腳位 7 | VSS — Ground reference |
| 腳位 8 | VDD — Positive supply (5 V nominal) |
| 腳位 9 | OSC1/CLKIN — Oscillator input / external clock in |
| 腳位 10 | OSC2/CLKOUT — Oscillator output / clock out |
| 腳位 11 | RC0 — PORTC bit 0 |
| 腳位 12 | RC1 — PORTC bit 1 |
| 腳位 13 | RC2 — PORTC bit 2 |
| 腳位 14 | RC3 — PORTC bit 3 |
| 腳位 15 | RC4 — PORTC bit 4 |
| 腳位 16 | RC5 — PORTC bit 5 |
| 腳位 17 | RC6 — PORTC bit 6 |
| 腳位 18 | RC7 — PORTC bit 7 |
| 腳位 19 | VSS — Ground reference |
| 腳位 20 | VDD — Positive supply (5 V nominal) |
| 腳位 21 | RB0/INT — PORTB bit 0 / external interrupt |
| 腳位 22 | RB1 — PORTB bit 1 |
| 腳位 23 | RB2 — PORTB bit 2 |
| 腳位 24 | RB3 — PORTB bit 3 |
| 腳位 25 | RB4 — PORTB bit 4 |
| 腳位 26 | RB5 — PORTB bit 5 |
| 腳位 27 | RB6 — PORTB bit 6 |
| 腳位 28 | RB7 — PORTB bit 7 |
| 腳位 29 | MCLR/VPP — Master clear reset / programming voltage |
| 腳位 30 | RA6 — PORTA bit 6 |
| 腳位 31 | RA7 — PORTA bit 7 |
| 腳位 32 | RD0 — PORTD bit 0 |
| 腳位 33 | RD1 — PORTD bit 1 |
| 腳位 34 | RD2 — PORTD bit 2 |
| 腳位 35 | RD3 — PORTD bit 3 |
| 腳位 36 | RD4 — PORTD bit 4 |
| 腳位 37 | RD5 — PORTD bit 5 |
| 腳位 38 | RD6 — PORTD bit 6 |
| 腳位 39 | RD7 — PORTD bit 7 |
| 腳位 40 | RE0/RD — PORTE bit 0 / parallel slave port read |
| 腳位 41 | RE1/WR — PORTE bit 1 / parallel slave port write |
| 腳位 42 | RE2/CS — PORTE bit 2 / parallel slave port chip select |
| 腳位 43 | VSS — Ground reference |
| 腳位 44 | VDD — Positive supply (5 V nominal) |
典型應用
PIC17C43T-33I/PQ 適用於 6 應用s: Industrial Control Loop Controllers, Motor Control Front-Ends, Consumer Appliance Controllers, Security and Access Control Panels, Automotive Body Electronics Legacy Modules, Instrumentation and Measurement Front-Ends.
Industrial Control Loop Controllers
The PIC17C43T-33I/PQ delivers 8.25 MIPS at 33 MHz and 454 bytes RAM, matching mid-speed industrial PID and supervisory control loops where sampling rates from 1 to 10 kHz are typical. Its 58-instruction RISC core and Harvard architecture simplify deterministic interrupt handling, while the 33 I/O pins are sufficient to interface 4-20 mA sensors, opto-isolated inputs, relay drivers, and character LCDs in compact PLC front-ends. The 8 KB OTP program memory holds typical ladder-logic-replacement C or assembly state machines for batching, conveyor sequencing, and tank-level control, while the industrial -40C to +85C rating tolerates factory floor enclosures. Unlike flash MCU alternatives, OTP ensures firmware cannot be accidentally overwritten by supply transients on long-life equipment.
推薦
Motor Control Front-Ends
With a 121 ns instruction cycle and 8.25 MIPS throughput, the PIC17C43T-33I/PQ executes trapezoidal commutation and PI current loops for small BLDC and stepper motor drivers at PWM frequencies up to 20 kHz. The 33 digital I/O pins natively drive three-phase gate signals, Hall-sensor inputs, encoder feedback, and fault comparators without external bus expanders. The 44-MQFP footprint gives compact PCB integration with sufficient copper area for thermal dissipation of the MCU itself. Designers migrating to Microchip's modern motor-control MCUs can drop in PIC17C43T-25I/PQ or PIC17C43T-33E/PQ for lower PWM frequency or extended thermal envelope drops. For newer designs, the PIC18F4331 dedicated motor-control family is preferred.
推薦
Consumer Appliance Controllers
The PIC17C43T-33I/PQ targets mid-range appliance controllers such as washing machines, dishwashers, ovens, and HVAC thermostats where 8 KB of OTP code supports feature-rich UI and sensor scheduling. Its 8.25 MIPS throughput is sufficient for capacitive-touch key-scan, rotary encoder handling, and triac-fired heater/burner phase-angle control. The 454 bytes RAM provides adequate buffer for LCD refresh, EEPROM emulation of user settings, and soft-start state machines. The industrial temperature grade handles kitchen and laundry-room thermal extremes, while the 44-MQFP package accommodates both handsoldered prototype and high-volume SMT assembly. Drop-in alternatives such as PIC17C43T-25I/PQ allow cost-down when 25 MHz throughput is acceptable.
推薦
Security and Access Control Panels
The PIC17C43T-33I/PQ integrates 33 I/O pins, 8 KB OTP, and the PIC17C deterministic interrupt architecture required for security panels managing multiple keypads, PIR sensors, reed switches, and siren outputs concurrently. OTP memory prevents firmware tampering during installation or field service and supports anti-tamper requirements common in commercial alarm systems. The 33 MHz throughput handles real-time encryption of credential cards and fast PIN-debounce scanning without missed interrupts. The industrial temperature range suits indoor installations in unconditioned electrical closets. Existing panel designs migrated from PIC16C5X can be transitioned to PIC17C43T-33I/PQ with minimal code rework, and trade-offs to PIC17C43T-33E/PQ enable extended-temperature outdoor-rated panels.
推薦
Automotive Body Electronics Legacy Modules
Although not AEC-Q100 qualified, the PIC17C43T-33I/PQ runs in pre-AEC automotive interior modules such as seat controllers, mirror adjusters, and lighting timers where extended-temp is sufficient. With 8 KB OTP and 33 MHz throughput, the device supports CAN-bit-banging or LIN-master emulation in older vehicle architectures. The 44-MQFP footprint tolerates the higher vibration environment of body-comfort subsystems with proper underfill or socket mounting. For new designs, Microchip recommends migrating to dsPIC33 or PIC18F AEC-Q100 parts. Existing fleet maintenance and aftermarket refurbishment continue to consume PIC17C43T-33I/PQ inventory, and PIC17C43T-33E/PQ offers a -40C to +125C drop-in upgrade for warmer under-cabin placements.
推薦
Instrumentation and Measurement Front-Ends
The PIC17C43T-33I/PQ's deterministic 121 ns instruction cycle and Harvard architecture suit digital multimeters, bench-top multimeter front-ends, and laboratory instrumentation where repeatable timing matters for ADC sequencing and measurement averaging. Its 8 KB OTP and 454 bytes RAM hold calibration tables and DSP-like filtering routines for true-RMS conversion. The 33 I/O pins interface LCD drivers, rotary encoders, function buttons, and isolated serial ports to PCs. Because OTP firmware cannot drift once programmed, the part is a strong fit for factory-calibrated instruments. The 44-MQFP package fits in compact handheld enclosures, and drop-in variants like PIC17C43T-25I/PQ support mid-tier products with fewer measurements per second.
推薦
推薦產品摘要
工程參考資料，適用於 PIC17C43T-33I/PQ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC17C43-33I/PQ | PIC17C43T-25I/PQ | PIC17C43T-33E/PQ | PIC17C43T-16/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10) | 44-MQFP (10x10) | 44-MQFP (10x10) | 44-MQFP (10x10) | 44-MQFP (10x10) |
| Maximum Clock Frequency | 33 MHz | 33 MHz | 25 MHz | 33 MHz | 16 MHz |
| Throughput (MIPS) | 8.25 MIPS | 8.25 MIPS | 6.25 MIPS | 8.25 MIPS | 4 MIPS |
| Program Memory Size | 8 KB (4K x 16) OTP | 8 KB OTP | 8 KB OTP | 8 KB OTP | 8 KB OTP |
| RAM Size | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Extended (-40C to +125C) | Industrial (-40C to +85C) |
| Pin/Package Suffix | PQ (44-MQFP), T (Tape & Reel) | PQ (44-MQFP), Tray | PQ (44-MQFP), T (Tape & Reel) | PQ (44-MQFP), T (Tape & Reel) | PT (44-TQFP), T (Tape & Reel) |
主要差異化特點
- Highest throughput in the PIC17C43 family at 33 MHz/8.25 MIPS (對比PIC17C43T-25I/PQ)
- Tape-and-Reel option for high-volume SMT assembly (對比PIC17C43-33I/PQ)
- Industrial temperature grade vs extended grade trade-off (對比PIC17C43T-33E/PQ)
設計說明
Place a 0.1 uF decoupling capacitor as close as possible to every VDD pin (pins 8, 20, 44) and pair each with a bulk 10 uF tantalum or ceramic cap to handle inrush when OTP programming or large peripherals switch. The 44-MQFP body ties its thermal pad through the lead frame to the die substrate; include a copper pour under the IC connected to VSS to provide a low-impedance ground return and a modest thermal sink. Keep crystal traces from OSC1 (pin 9) and OSC2 (pin 10) short and surrounded by a ground ring to suppress EMI from the 33 MHz fundamental and 121 ns instruction cycle edges. The MCLR/VPP pin (29) requires a 10 kohm pull-up to VDD for normal operation and a separate isolation path to the programmer's VPP rail to allow high-voltage in-circuit serial programming.
At 33 MHz across the 5 V supply, the PIC17C43T-33I/PQ core dissipates approximately 50-75 mW in active mode. The 44-MQFP 10x10 mm package has a typical junction-to-ambient thermal resistance (theta_JA) of around 50-60 C/W on a 1 oz 2-layer board with no airflow, so junction temperature rises roughly 3-4 C above ambient. In sealed enclosures above 60 C, de-rate clock frequency or add a copper thermal pad connected through thermally conductive vias under the exposed lead frame. The 'E' suffix variants such as PIC17C43T-33E/PQ support higher ambient temperatures (-40C to +125C) without derating, suitable for under-cabin or industrial-cabinet deployments.
OTP (One-Time Programmable) memory cannot be erased after programming - thoroughly verify firmware with JW windowed or emulated parts before committing to a production reel of PIC17C43T-33I/PQ. Because Microchip places the family in last-time-buy (NRND), do not design it into new platforms - use PIC18F4220 with its flash memory, larger RAM, and active production status. When sourcing, beware of counterfeits on the gray market: validate date codes and lot traceability with the authorized distributor, and confirm the device is factory-sealed from Microchip. Finally, never leave MCLR/VPP floating; an oscillating or pulled MCLR during brown-out causes spurious resets that may corrupt RAM variables.
合規資訊
RoHS/REACH compliance not specified in verified web data; PIC17C43 was released before RoHS-5/6 transitions and many lots were non-compliant unless explicitly lead-free (Pb-free) marked. AEC-Q100 not qualified - this is an industrial-grade MCU, not automotive AEC-grade. For new automotive designs, use AEC-Q100 qualified parts from Microchip's dsPIC33 or PIC18F families.
