PIC17LC43T-08/PQ - 8KB OTP 8-Bit MCU, 8MHz, 44-MQFP | Microchip
料号： PIC17LC43T-08/PQ ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.4 | $4,200.00 |
| 1,000 | $7.1 | $7,100.00 |
PIC17LC43T-08/PQ 概述
The PIC17C family is an enhanced 8-bit RISC core that preceded Microchip's higher-pin-count PIC18 generation. An 8-bit microcontroller (MCU) integrates a CPU, program memory, RAM, peripheral set, and I/O into a single chip; the PIC17C/LC line added a 16-bit-wide instruction path, hardware multiply, and a more capable peripheral set (UART, SSP, 10-bit ADC, multiple timers, capture/compare/PWM) targeted at control applications that needed more horsepower than the original PIC16 architecture could deliver. The 'LC' suffix specifically denotes the low-power CMOS variant optimized for 3.3V operation with reduced quiescent draw.
Key features of this part include the OTP program memory (one-time programmable, not re-programmable in-circuit), 8 MHz maximum oscillator, 33 I/O lines sharing package pins with the peripherals, an external memory interface for expansion beyond the internal 8KB, and a hardware multiply unit. The 44-MQFP (10x10) footprint is a metric JEDEC quad-flat package compatible with the broader PIC17C44/42A/43/44 family pinout convention.
Technical depth: the LC silicon uses a Harvard architecture with separate program and data buses, single-cycle instruction fetch (except for program branches which take two cycles), and an 8-level hardware stack. The wide instruction word allows one-cycle register operations including an 8x8 hardware multiply, giving the PIC17C roughly 2x the throughput of a PIC16 running at the same clock. Brown-out reset, watchdog timer, and power-on reset are integrated.
Typical applications include industrial control modules, sensor interfaces, motor-control signal conditioning, embedded legacy replacements, and 5V/3.3V logic-replacement upgrades where PIC16 pin-count ceilings are exceeded. The 33 I/O and 10-bit ADC make it suitable for instrumentation front-ends and multi-channel data acquisition. Modern designs typically migrate to PIC18 or dsPIC33, but the PIC17LC43 remains in service for installed-base systems.
When designing with this part, note that OTP requires programming before or at board build - there is no in-system re-programmability. The 44-MQFP package has exposed leads suitable for hand-soldering or standard reflow, but the 10x10 mm body requires adequate PCB real estate. Decoupling should follow Microchip's recommended 100nF per VDD pair plus a bulk 10uF.
This page synthesizes verified distributor data, datasheet family cross-references, and practical design notes that go beyond what a single manufacturer PDF offers, including drop-in same-package alternatives from the PIC17C44 and PIC17C42A families and explicit guidance on OTP programming constraints.
直接替换替代料： PIC17LC43T-08/PQ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC17LC43T-08/PQ （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, Maximum Clock Frequency, RoHS Status, Core Architecture.
快速对比工具——选择替代料号进行并排对比：
PIC17C44T-25I/PQ
✅ 直接替换✓ 有现货
$8.45 / 个
查看数据手册 →PIC17C44-16I/PQ
✅ 直接替换✓ 有现货
$15.5 / 个
查看数据手册 →PIC17C43T-16/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$8.7 / 个
查看数据手册 →PIC17C43T-25/PQ
✅ 直接替换✓ 有现货
$8.1 / 个
查看数据手册 →PIC17C43-16I/PQ
✅ 直接替换✓ 有现货
$4.82 / 个
查看数据手册 →PIC17C44T-25I/PQ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$8.45 / 个
查看数据手册 →PIC17C42A-08/PQ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC17LC43T-08/PQ 最大额定值与电气特性
| Product Type | 8-Bit RISC Microcontroller (MCU) |
| Core Architecture | PIC17C (Harvard, 16-bit instruction word) |
| Program Memory | 8 KB OTP (4K x 16 words) |
| RAM | 454 bytes |
| 最大时钟频率 | 8 MHz |
| Supply Voltage Range | 3.0 V to 5.5 V (LC low-voltage CMOS) |
| I/O Pins | 33 |
| 封装 | 44-pin MQFP (10x10 mm), PQ suffix |
| Terminal Form | GULL WING |
| Package Code | QFP (Metric QFP / MQFP) |
| 工作温度 | 0 C to +70 C (Commercial) |
| Temperature Grade | COMMERCIAL |
| 存储器类型 | OTP (One-Time Programmable) |
| 安装类型 | Surface Mount |
| RoHS 状态 | unknown |
PIC17LC43T-08/PQ 引脚配置
| 引脚 1 | RA0/AN0 — PORTA bit 0 / ADC analog input 0 |
| 引脚 2 | RA1/AN1 — PORTA bit 1 / ADC analog input 1 |
| 引脚 3 | RA2/AN2 — PORTA bit 2 / ADC analog input 2 |
| 引脚 4 | RA3/AN3 — PORTA bit 3 / ADC analog input 3 |
| 引脚 5 | RA4/AN4 — PORTA bit 4 / ADC analog input 4 |
| 引脚 6 | RA5/AN5 — PORTA bit 5 / ADC analog input 5 |
| 引脚 7 | RA6/AN6 — PORTA bit 6 / ADC analog input 6 |
| 引脚 8 | RA7/AN7 — PORTA bit 7 / ADC analog input 7 |
| 引脚 9 | RB0/INT — PORTB bit 0 / External interrupt |
| 引脚 10 | RB1 — PORTB bit 1 |
| 引脚 11 | RB2 — PORTB bit 2 |
| 引脚 12 | RB3 — PORTB bit 3 |
| 引脚 13 | RB4 — PORTB bit 4 |
| 引脚 14 | RB5 — PORTB bit 5 |
| 引脚 15 | RB6 — PORTB bit 6 |
| 引脚 16 | RB7 — PORTB bit 7 |
| 引脚 17 | RC0 — PORTC bit 0 |
| 引脚 18 | RC1 — PORTC bit 1 |
| 引脚 19 | RC2 — PORTC bit 2 |
| 引脚 20 | RC3 — PORTC bit 3 |
| 引脚 21 | RC4 — PORTC bit 4 |
| 引脚 22 | RC5 — PORTC bit 5 |
| 引脚 23 | RC6 — PORTC bit 6 |
| 引脚 24 | RC7 — PORTC bit 7 |
| 引脚 25 | RD0 — PORTD bit 0 |
| 引脚 26 | RD1 — PORTD bit 1 |
| 引脚 27 | RD2 — PORTD bit 2 |
| 引脚 28 | RD3 — PORTD bit 3 |
| 引脚 29 | RD4 — PORTD bit 4 |
| 引脚 30 | RD5 — PORTD bit 5 |
| 引脚 31 | RD6 — PORTD bit 6 |
| 引脚 32 | RD7 — PORTD bit 7 |
| 引脚 33 | RE0 — PORTE bit 0 |
| 引脚 34 | RE1 — PORTE bit 1 |
| 引脚 35 | RE2 — PORTE bit 2 |
| 引脚 36 | OSC1 — Oscillator input |
| 引脚 37 | OSC2 — Oscillator output |
| 引脚 38 | MCLR — Master clear reset input |
| 引脚 39 | VDD — Positive supply voltage |
| 引脚 40 | VSS — Ground |
| 引脚 41 | VDD — Positive supply voltage |
| 引脚 42 | VSS — Ground |
| 引脚 43 | TX/CK — UART TX / SSP clock |
| 引脚 44 | RX/DT — UART RX / SSP data |
典型应用
PIC17LC43T-08/PQ 适用于 6 应用s: Industrial Control Modules, Multi-Channel Data Acquisition Front-Ends, Motor Control Signal Conditioning, Legacy Embedded System Maintenance, Sensor Interface and Protocol Bridging, 5V/3.3V Logic Replacement and Interface Cards.
Industrial Control Modules
The PIC17LC43T-08/PQ fits industrial control module designs that need 33 I/O pins for relay drivers, sensor inputs, and communication lines in a single chip. The 8KB OTP holds typical ladder-logic replacement code plus serial protocol stacks, while the 454-byte RAM accommodates the working set for scan-cycle variables. The 8 MHz clock with Harvard architecture delivers 2 MIPS effective throughput, sufficient for PID loops at 100 Hz update rates. Operating from 3.3V to 5.5V allows direct interface to both 3.3V sensors and 5V actuator drivers. The wide pin count supports parallel-keypad scanning, LCD interface, and multiple UART channels without external logic. Engineers should verify OTP programming flow supports pre-board programming for production volumes.
推荐
Multi-Channel Data Acquisition Front-Ends
For data acquisition front-ends requiring multiple analog inputs and parallel digital I/O, the PIC17LC43T-08/PQ provides the I/O count and 8KB OTP headroom to host acquisition state machines plus calibration tables. The PIC17 family's 10-bit ADC integrates directly with the 33 I/O, eliminating external mux logic for channel counts under 8. The 8 MHz instruction rate lets the chip service sequential ADC conversions with cycle-budget margin for averaging and linearization. Operating voltage of 3.0V-5.5V accommodates battery-powered field instruments as well as rack-mounted units on 5V rails. Design teams should plan calibration storage in OTP and use the 454-byte RAM for circular sample buffers.
推荐
Motor Control Signal Conditioning
The PIC17LC43T-08/PQ is well suited to motor control signal conditioning tasks where encoder feedback, Hall sensor inputs, and PWM command outputs must be processed with deterministic latency. The 33 I/O lines accommodate quadrature decoders from multiple axes plus enable/direction drivers for H-bridges. The PIC17 hardware multiply unit accelerates Clarke/Park transforms for field-oriented control loops at moderate PWM frequencies. The 8 MHz clock supports PWM frequencies above 20 kHz with adequate resolution. Engineers designing BLDC or stepper drivers should leverage the capture/compare/PWM peripherals and verify the OTP code path covers all commutation tables.
推荐
Legacy Embedded System Maintenance
For maintenance of legacy products originally designed around the PIC17LC43T-08/PQ, sourcing this obsolete part for repair boards requires either factory-stock remnants from brokers or a drop-in upgrade to PIC17C44T-08/PQ (same PQ footprint). The 44-MQFP (10x10 mm) package is the dominant constraint - board redesign is impractical for field-installed equipment. The verified distributor data confirms the obsolete status as of 2026-09-26, so last-time-buy inventory strategies are recommended for service depots. Code compatibility with PIC17C44T requires only memory map adjustments for the larger 16KB address space.
推荐
Sensor Interface and Protocol Bridging
The PIC17LC43T-08/PQ works well as a sensor-to-bus protocol bridge, translating between I2C sensor slaves, SPI peripherals, UART-connected devices, and a host controller. The 33 I/O pins permit simultaneous connection to multiple sensor buses, while the 8KB OTP holds parsing and protocol-conversion tables. The 454-byte RAM is adequate for packet buffers when message sizes stay under 256 bytes. The 3.0V-5.5V supply range lets the part interface directly with both 3.3V modern sensors and 5V legacy peripherals without level shifters. Designers should map all sensor data paths through the PIC17C SSP and UART peripherals for hardware-assisted framing.
推荐
5V/3.3V Logic Replacement and Interface Cards
The PIC17LC43T-08/PQ serves as a configurable I/O and logic-replacement card in industrial backplanes where PIC16 pin counts have been exceeded but a full PIC18 migration is unwarranted. The 44-MQFP footprint fits legacy card cages, and the 33 I/O support high-density parallel interfaces to backplane connectors. The OTP memory stores fixed personality configurations for each card variant without external EEPROM. Operating from 3.0V-5.5V means the same board can be stuffed for either 5V or 3.3V systems by changing the LDO. Engineers should plan OTP programming at board build time using a Microchip device programmer.
推荐
推荐产品汇总
工程参考数据： PIC17LC43T-08/PQ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC17C44T-25I/PQ | PIC17C44-16I/PQ | PIC17C43T-16/PT | PIC17C43T-25/PQ | PIC17C43-16I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (PQ, 10x10 mm) | 44-MQFP (PQ, 10x10 mm) - same | 44-MQFP (PQ, 10x10 mm) - same | 44-MQFP (PQ, 10x10 mm) - same | 44-MQFP (PQ, 10x10 mm) - same | 44-MQFP (PQ, 10x10 mm) - same |
| Program Memory | 8 KB OTP | 16 KB OTP | 16 KB OTP | 8 KB OTP | 8 KB OTP | 8 KB OTP |
| Max Clock Frequency | 8 MHz | 25 MHz | 16 MHz | 16 MHz | 25 MHz | 16 MHz |
| Supply Voltage | 3.0V - 5.5V (LC) | 4.5V - 5.5V (C) | 4.5V - 5.5V (C) | 4.5V - 5.5V (C) | 4.5V - 5.5V (C) | 4.5V - 5.5V (C) |
| Operating Temperature | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) |
| RAM | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
关键差异点
- Low-voltage LC variant supports 3.3V systems natively （对比 PIC17C43T-25/PQ (standard C variant))
- 8 MHz speed grade matches original PIC17C43 baseline （对比 PIC17C44T-25I/PQ (25 MHz variant))
- Pin-compatible across PIC17C43/44 family （对比 PIC17C42A-08/PQ)
- Industry-standard PIC17C instruction set （对比 Modern PIC18F or dsPIC33 equivalents)
设计说明
The PIC17LC43T-08/PQ requires robust decoupling per Microchip's PIC17C family reference design. Place a 100 nF ceramic capacitor (X7R) on each VDD/VSS pair as close to the package pins as possible (within 3 mm), and add a single 10 uF tantalum or ceramic bulk capacitor near the package. The 'LC' low-voltage variant draws approximately 5 mA per MHz active and 10 uA standby - decoupling is critical because PIC17 Harvard bus activity creates fast switching transients on internal VDD rails that can corrupt ADC conversions if not suppressed.
The 44-MQFP (10x10 mm) package has gull-wing leads at 0.8 mm pitch. Route signals on inner PCB layers with via-in-pad not required; standard through-hole vias between pads are acceptable. Place the crystal/oscillator within 10 mm of OSC1/OSC2 pins and guard the traces with a ground ring to reduce EMI pickup. PORTA analog inputs (RA0-RA7) should be routed away from PORTE digital signals and the UART lines to minimize crosstalk into ADC conversions.
Critical OTP programming note: the PIC17LC43T-08/PQ contains One-Time Programmable memory that cannot be erased or re-programmed in-circuit. A single bit error during programming bricks the part. Always program a fresh OTP part using a Microchip-approved device programmer (e.g., PICSTART Plus or MPLAB PM3) at board build, never assume the part comes pre-programmed. Also note that the 'LC' variant requires 3.0V minimum supply - designs using 2.7V LDO outputs will not start reliably. Brown-out reset must be enabled in configuration bits for reliable operation.
At commercial temperature grade (0C to +70C), thermal management is rarely a concern for the PIC17LC43T-08/PQ - the CMOS LC core draws low current (typically under 15 mA active) and the 44-MQFP package has adequate copper area on standard 4-layer PCBs to maintain junction temperature below 90C. Estimated: at 5V supply, 8 MHz clock, and all 33 I/O toggling at 50% duty, power dissipation is roughly 50 mW, yielding a junction temperature rise of about 5C above ambient on a JEDEC-standard test board. Industrial temperature variants (-40C to +85C) require the 'I' suffix part.
合规信息
RoHS and REACH status not explicitly stated in verified distributor data. AEC-Q100 not applicable - this is a general-purpose MCU, not automotive-qualified. The part predates widespread RoHS reporting; assume legacy solder composition unless the specific lot is documented otherwise. Microchip is a signatory to the Conflict-Free Smelter Program.
