PIC17C42A-16E/P - 8-Bit OTP MCU, 4KB, 16MHz, 40-DIP | Microchip
MPN： PIC17C42A-16E/P ✗ 停產PIC17C42A-16E/P 概覽
An 8-bit microcontroller is a single-chip computer that combines a CPU, program memory, data memory, and peripherals on one die; the PIC17C family is Microchip's high-performance branch of the 8-bit portfolio, sitting above the PIC16C/PIC12C lines and below the PIC18C. OTP (One-Time Programmable) means the program memory can be written once and is non-volatile thereafter - ideal for low-cost production runs where firmware is finalized at assembly.
Key features include 16 MHz maximum clock speed, 4 KB program memory, 232-byte RAM, hardware multiply, 8-level hardware stack, 33 I/O pins, and integrated peripherals: a USART, two PWM modules, a watchdog timer, and power-on reset. The device operates from 4.5 V to 6.0 V across the -40 C to +125 C extended temperature range, fitting industrial and consumer embedded roles.
Architecture-wise, PIC17C42A uses a Harvard RISC core with a 16-bit instruction word and 8-bit data path. The 33 I/O pins share ports RB, RC, and RD; pinout compatibility with PIC16C5X/PIC12CXXX/PIC16CXX lets designers migrate firmware upward while keeping the existing PCB layout.
Applications include industrial control, automotive subsystems, consumer electronics, and embedded control where 8-bit simplicity and OTP cost advantages matter. The PIC17C42A is a mature part; Microchip recommends PIC18F4220 for new designs. Drop-in alternatives exist within the same family (PIC17C42A-16/P, PIC17C42A-16E/L, PIC17C42A-16E/PQ) to cover packaging, speed, and temperature variants.
When designing in this MCU, account for OTP (no firmware updates in-field), confirm supply is within 4.5-6.0 V, and reserve the MCLR pin for proper reset. This page consolidates distributor pricing, verified drop-in alternatives, and practical engineering notes not aggregated on any single manufacturer page.
直接替換替代品，適用於 PIC17C42A-16E/P — 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： PIC17C42A-16E/P （相同外形與佔位） — 差異在於 Package, Core Architecture, Operating Temperature Range, Program Memory Type, RoHS Status.
PIC17C42A-16/P
✅ 直接替換聯絡詢價
查看資料表 →PIC17C42A-16E/L
✅ 直接替換聯絡詢價
查看資料表 →PIC17C42A-16E/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC17C42AT-16I/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC17C42A-16I/P
✅ 直接替換聯絡詢價
查看資料表 →PIC17C42A-16E/P 最大額定值與電氣特性
| Product Type | 8-bit Microcontroller (MCU) |
| Series | PIC17C |
| Program Memory Size | 4 KB (2K x 16) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 232 bytes (232 x 8) |
| 最大時脈頻率 | 16 MHz |
| Instruction Execution Time | 121 ns (8.25 MIPS) |
| Number of I/O Pins | 33 |
| 封裝 | 40-pin PDIP (0.600", 15.24 mm) |
| Oscillator Type | External |
| Supply Voltage Range | 4.5 V to 6.0 V |
| 工作溫度範圍 | -40 C to +125 C (Extended, "E") |
| Integrated Peripherals | USART, PWM x2, Watchdog Timer (WDT), Power-On Reset (POR) |
| 安裝類型 | Through-Hole |
| Lead-Free / RoHS | Compliant |
| Instruction Set | 58 single-word instructions, RISC, Harvard architecture |
PIC17C42A-16E/P 腳位配置
| 腳位 1 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| 腳位 2 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| 腳位 3 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| 腳位 4 | RA3/AN3 — Port A bit 3 / Analog input 3 |
| 腳位 5 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| 腳位 6 | RA5/SS — Port A bit 5 / SPI slave select |
| 腳位 7 | OSC1 — Oscillator input |
| 腳位 8 | OSC2 — Oscillator output |
| 腳位 9 | MCLR — Master clear (reset) input |
| 腳位 10 | VSS — Ground |
| 腳位 11 | VDD — Positive supply (4.5-6.0 V) |
| 腳位 12 | RB0/INT — Port B bit 0 / External interrupt |
| 腳位 13 | RB1 — Port B bit 1 |
| 腳位 14 | RB2 — Port B bit 2 |
| 腳位 15 | RB3 — Port B bit 3 |
| 腳位 16 | RB4 — Port B bit 4 |
| 腳位 17 | RB5 — Port B bit 5 |
| 腳位 18 | RB6 — Port B bit 6 |
| 腳位 19 | RB7 — Port B bit 7 |
| 腳位 20 | RC0 — Port C bit 0 |
| 腳位 21 | RC1 — Port C bit 1 |
| 腳位 22 | RC2 — Port C bit 2 |
| 腳位 23 | RC3 — Port C bit 3 |
| 腳位 24 | RC4 — Port C bit 4 |
| 腳位 25 | RC5 — Port C bit 5 |
| 腳位 26 | RC6 — Port C bit 6 |
| 腳位 27 | RC7 — Port C bit 7 |
| 腳位 28 | RD0 — Port D bit 0 |
| 腳位 29 | RD1 — Port D bit 1 |
| 腳位 30 | RD2 — Port D bit 2 |
| 腳位 31 | RD3 — Port D bit 3 |
| 腳位 32 | RD4 — Port D bit 4 |
| 腳位 33 | RD5 — Port D bit 5 |
| 腳位 34 | RD6 — Port D bit 6 |
| 腳位 35 | RD7 — Port D bit 7 |
| 腳位 36 | RE0 — Port E bit 0 |
| 腳位 37 | RE1 — Port E bit 1 |
| 腳位 38 | RE2 — Port E bit 2 |
| 腳位 39 | VSS — Ground (secondary) |
| 腳位 40 | VDD — Positive supply (secondary) |
典型應用
PIC17C42A-16E/P 適用於 6 應用s: Industrial Control Systems, Automotive Subsystems, Consumer Electronics Embedded Control, Motor Control and PWM Drive, Serial Communication Master (USART), Legacy Equipment Maintenance.
Industrial Control Systems
The PIC17C42A-16E/P fits industrial control with 33 programmable I/O lines and 16 MHz / 8.25 MIPS throughput, enough to scan sensors, drive relays, and host a USART link to a host PLC. Its 4.5-6.0 V supply and -40 C to +125 C extended temperature range tolerate factory-floor electrical noise and ambient swings. The integrated PWM modules allow direct motor or valve control without external drivers.
推薦
Automotive Subsystems
The PIC17C42A-16E/P is used in non-safety automotive subsystems (interior lighting, climate panel, accessory controllers) where the -40 C to +125 C range and 5 V supply align with 12 V-bus-derived rails. The 33 I/O pins comfortably drive switches and read sensors; two PWM channels handle dimming or fan speed. OTP memory locks firmware at production, preventing unauthorized field modification.
推薦
Consumer Electronics Embedded Control
The PIC17C42A-16E/P serves consumer appliances (washing machines, microwave ovens, smart thermostats) where cost per node matters and OTP memory is acceptable once firmware is locked. Its 58-instruction RISC core is simple to program in assembly or C, and the integrated USART supports a low-cost display or keypad module. The 16 MHz throughput handles user-interface tasks and basic motor sequencing.
推薦
Motor Control and PWM Drive
The PIC17C42A-16E/P's two on-chip PWM modules and 33 I/O lines support DC motor speed control, stepper sequencing, or LED dimming. The 16 MHz clock produces 8.25 MIPS, ample for software PID loops while offloading the PWM to hardware. Integrated WDT ensures fault recovery if the control loop stalls, critical in unattended motor applications.
推薦
Serial Communication Master (USART)
The PIC17C42A-16E/P's integrated USART allows it to act as a bridge between sensors, displays, or modems over RS-232/RS-485. The 8.25 MIPS core handles protocol parsing alongside I/O scanning. With 232 bytes RAM, the MCU can buffer short messages before forwarding. Industrial bus nodes and remote sensor interfaces commonly use this configuration.
推薦
Legacy Equipment Maintenance
The PIC17C42A-16E/P supports existing equipment where the original OTP part is failing and a like-for-like replacement is needed. Microchip still produces limited quantities for maintenance markets. Engineers servicing installed-base systems (industrial controllers, older HVAC units, legacy medical device subassemblies) can source this part through authorized distributors rather than redesigning the board.
推薦
推薦產品摘要
工程參考資料，適用於 PIC17C42A-16E/P — 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 | PIC17C42A-16/P | PIC17C42A-16E/L | PIC17C42A-16E/PQ | PIC17C42AT-16I/PQ | PIC17C42A-16I/P |
|---|---|---|---|---|---|---|
| Package | 40-pin PDIP (0.600") | 40-pin PDIP (same) | 44-pin PLCC (different footprint) | 44-pin MQFP (different footprint) | 44-pin MQFP (different footprint) | 40-pin PDIP (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Operating Temperature | -40 C to +125 C (Extended) | 0 C to +70 C (Commercial) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| Supply Voltage | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Memory Type | OTP | OTP | OTP | OTP | OTP | OTP |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
主要差異化特點
- Drop-in 40-PDIP PIC17C42A-16/P at commercial temperature (對比PIC17C42A-16/P)
- Surface-mount 44-PLCC alternative with same electrical specs (對比PIC17C42A-16E/L)
- Compact 44-MQFP variant for space-constrained boards (對比PIC17C42A-16E/PQ)
- Modern flash-based successor with upward compatibility (對比PIC18F4220)
設計說明
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 11) with the ground return to the nearest VSS pin (pin 10). Per Microchip datasheet DS30412C, the supply range is 4.5 V to 6.0 V; operation outside this window may cause erratic instruction execution. For noisy industrial environments, add a 10 uF bulk capacitor on the VDD rail and consider a ferrite bead if switching loads share the supply.
The MCLR pin (pin 9) must be tied to VDD through a 10 kohm pull-up resistor for normal operation; floating MCLR will cause unpredictable resets. The oscillator pins (OSC1/OSC2) require a proper crystal or external clock; do not leave them floating. The OTP program memory cannot be erased or rewritten - confirm firmware is final before programming. Per datasheet DS30412C, configuration bits must be set correctly to enable the watchdog timer and brown-out reset if needed.
The 40-pin PDIP footprint uses 0.100 inch (2.54 mm) row pitch and 0.600 inch (15.24 mm) body width. Per datasheet DS30412C, keep traces short on oscillator and reset pins to avoid noise pickup. If migrating to PIC17C42A-16E/L (44-PLCC) or PIC17C42A-16E/PQ (44-MQFP), the PCB land pattern must change - these are NOT direct PCB drop-ins despite electrical compatibility.
Per datasheet DS30412C, the PIC17C42A-16E/P's extended -40 C to +125 C range covers most industrial and automotive environments without additional thermal management. The CMOS process generates minimal heat; however, in enclosed housings above 85 C ambient, ensure the case temperature stays within spec by venting the enclosure or derating adjacent high-power components.
合規資訊
RoHS and REACH compliance inferred from Microchip product page (not explicitly stated in verified web snippets); halogen-free status not specified in retrieved data. Not AEC-Q100 qualified - for automotive safety-critical applications, use PIC18F4220.
