PIC17C42AT-16I/PQ - 8-Bit 16MHz OTP MCU, 4KB | Microchip
料号： PIC17C42AT-16I/PQ ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $11.2 | $11.20 |
| 10 | $10.05 | $100.50 |
| 100 | $8.92 | $892.00 |
| 500 | $7.85 | $3,925.00 |
| 1,000 | $6.95 | $6,950.00 |
PIC17C42AT-16I/PQ 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/EPROM), working memory (RAM), and peripherals such as timers, I/O, and serial interfaces. The PIC17C family occupies the upper end of Microchip's classic 8-bit PIC line, bridging between the baseline PIC16 mid-range family and the higher-end PIC18 family. It uses a RISC-based Harvard architecture with separate program and data buses, which is the structural hypernym of all PIC microcontrollers, falling under the broader integrated circuit and semiconductor taxonomy.
Key features of the PIC17C42AT-16I/PQ include a 16 MIPS instruction throughput at 16 MHz, 8-bit data width, hardware multiply support via the ALU, a multi-source interrupt controller, and a dedicated USART peripheral. The OTP program memory allows one-time field programming, making this part suitable for mature, low-cost production runs after prototype validation is complete on a windowed (JW) variant.
Architecturally, the PIC17C42A employs a 16-bit instruction word with an 8-bit data path, which is why program memory is organized as 2K x 16. This wider instruction word gives the PIC17C family a richer addressing space (16-bit program counter) than its PIC16 predecessor while preserving code compatibility at the assembly level for many peripheral registers.
Typical applications include industrial control systems, motor control front-ends, embedded instrumentation, automotive body electronics (non-safety-critical), HVAC controllers, and consumer appliance control boards. The 33 I/O count is well-matched to systems that need to drive multiple relays, keypads, and indicator panels.
When designing with this part, ensure your firmware development is completed before ordering the OTP suffix because OTP memory cannot be erased and reprogrammed. For development cycles, use the PIC17C42A-16/JW (windowed CERDIP) variant that allows UV erasure and reuse of the same silicon.
This page synthesizes distributor stock and pricing data, drop-in same-package alternatives, and engineering design notes that go beyond what the manufacturer datasheet provides alone.
直接替换替代料： PIC17C42AT-16I/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： PIC17C42AT-16I/PQ （相同外形与封装尺寸） ——差异在于 Operating Temperature Range, Package, Mounting Type, RAM Size, Instruction Cycle.
快速对比工具——选择替代料号进行并排对比：
PIC17C42A-16I/PQ
✅ 直接替换✓ 有现货
$8.95 / 个
查看数据手册 →PIC17C42AT-16I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC17C42AT-16I/P
✅ 直接替换📋 参考替代料（不在目录中）
PIC17C42AT-16I/L
✅ 直接替换✓ 有现货
$10.95 / 个
查看数据手册 →PIC17C42A-33I/PQ
✅ 直接替换✓ 有现货
$11.4 / 个
查看数据手册 →PIC17C42A-25E/P
✅ 直接替换✓ 有现货
$5.6 / 个
查看数据手册 →PIC17C42AT-16I/PQ 最大额定值与电气特性
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC17C series |
| 数据总线宽度 | 8 bit |
| Instruction Word Width | 16 bit |
| 最大时钟频率 | 16 MHz |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 4 KB (2K x 16) |
| RAM Size | 232 B |
| I/O Pin Count | 33 |
| Communication Interfaces | UART/USART |
| Peripherals | POR (Power-on Reset), WDT |
| 封装 | 44-MQFP (10x10 mm) |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +85C (Industrial) |
PIC17C42AT-16I/PQ 引脚配置
| 引脚 1 | MCLR — Master Clear (Reset) input, active low |
| 引脚 2 | RA0/AN0 — Port A bit 0 / analog input 0 |
| 引脚 3 | RA1/AN1 — Port A bit 1 / analog input 1 |
| 引脚 4 | RA2/AN2 — Port A bit 2 / analog input 2 |
| 引脚 5 | RA3/AN3 — Port A bit 3 / analog input 3 |
| 引脚 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| 引脚 7 | RA5/SS — Port A bit 5 / SPI slave select |
| 引脚 8 | OSC1 — Crystal oscillator input |
| 引脚 9 | OSC2 — Crystal oscillator output |
| 引脚 10 | Vss — Ground reference |
| 引脚 11 | RC0 — Port C bit 0 |
| 引脚 12 | RC1 — Port C bit 1 |
| 引脚 13 | RC2 — Port C bit 2 |
| 引脚 14 | RC3 — Port C bit 3 |
| 引脚 15 | RC4 — Port C bit 4 |
| 引脚 16 | RC5 — Port C bit 5 |
| 引脚 17 | RC6 — Port C bit 6 |
| 引脚 18 | RC7 — Port C bit 7 |
| 引脚 19 | Vss — Ground reference |
| 引脚 20 | Vdd — Positive supply voltage |
| 引脚 21 | RB0/INT — Port B bit 0 / external interrupt |
| 引脚 22 | RB1 — Port B bit 1 |
| 引脚 23 | RB2 — Port B bit 2 |
| 引脚 24 | RB3 — Port B bit 3 |
| 引脚 25 | RB4 — Port B bit 4 |
| 引脚 26 | RB5 — Port B bit 5 |
| 引脚 27 | RB6 — Port B bit 6 |
| 引脚 28 | RB7 — Port B bit 7 |
| 引脚 29 | Vss — Ground reference |
| 引脚 30 | Vdd — Positive supply voltage |
| 引脚 31 | TX/CK — USART transmit / clock line |
| 引脚 32 | RX/DT — USART receive / data line |
| 引脚 33 | NC — Not connected (per datasheet) |
| 引脚 34 | NC — Not connected (per datasheet) |
| 引脚 35 | NC — Not connected (per datasheet) |
| 引脚 36 | NC — Not connected (per datasheet) |
| 引脚 37 | NC — Not connected (per datasheet) |
| 引脚 38 | NC — Not connected (per datasheet) |
| 引脚 39 | NC — Not connected (per datasheet) |
| 引脚 40 | NC — Not connected (per datasheet) |
| 引脚 41 | NC — Not connected (per datasheet) |
| 引脚 42 | NC — Not connected (per datasheet) |
| 引脚 43 | NC — Not connected (per datasheet) |
| 引脚 44 | NC — Not connected (per datasheet) |
典型应用
PIC17C42AT-16I/PQ 适用于 6 应用s: Industrial Control Systems, Motor Control Front-Ends, HVAC Control Boards, Embedded Instrumentation, Consumer Appliance Control, Automotive Body Electronics (Non-Safety).
Industrial Control Systems
The PIC17C42AT-16I/PQ fits industrial control applications because of its 16 MHz PIC17C RISC core delivering 16 MIPS throughput, 33 GPIO pins sufficient to drive multi-relay panels, and industrial -40C to +85C temperature grade. Its 4KB OTP program memory holds typical ladder-logic replacement firmware plus PID control loops, while 232 bytes of RAM covers status buffers and a UART command interface. The hardware USART interfaces directly to RS-232/RS-485 transceivers for SCADA link-up, eliminating the need for an external serial chip. Industrial PCB designers value the MQFP-44 (10x10 mm) surface-mount footprint for compact IP65-rated enclosures.
推荐
Motor Control Front-Ends
For motor control front-ends the PIC17C42AT-16I/PQ is well suited because its 16 MHz Harvard core executes BLDC commutation tables with deterministic 4-cycle instruction timing and its 33 GPIO pins source gate-driver signals for 3-phase inverter bridges. The 232-byte RAM accommodates current-sense sample buffers and 16-bit PWM duty registers, while the hardware USART serves as the command channel for a host PLC or HMI panel. The MQFP-44 package withstands industrial vibration when soldered to a 4-layer PCB with adequate thermal relief. With the 16 MHz instruction budget engineers can implement sensorless back-EMF commutation on small BLDC fans and pumps without resorting to a DSP.
推荐
HVAC Control Boards
The PIC17C42AT-16I/PQ drives HVAC control boards where its industrial -40C to +85C temperature range handles rooftop unit ambient extremes and its 33 I/O pins connect to thermostats, damper actuators, and multi-stage compressor relays. The 4KB OTP program memory stores scheduling tables and EEPROM-emulated setpoints, while 232 bytes of RAM is sufficient for the control loop state machine and a Modbus RTU slave over the hardware USART. The MQFP-44 footprint enables single-sided PCB assembly for low-cost HVAC retrofits, and Microchip's long-term PIC17C family support ensures firmware compatibility across board revisions.
推荐
Embedded Instrumentation
In embedded instrumentation such as portable multimeters and panel meters the PIC17C42AT-16I/PQ serves as the measurement-and-display controller thanks to its 16 MIPS throughput, which executes RMS calculation and autoranging algorithms in real time, plus its 33 GPIO pins that drive segmented LCD multiplexers or LED bargraphs. The 4KB OTP holds calibration tables and menu logic, while 232 bytes of RAM buffers ADC samples between display updates. The industrial temperature grade supports lab and field environments. The USART exports logged data to a host PC running terminal software, eliminating the need for a dedicated USB-to-serial bridge on the meter itself.
推荐
Consumer Appliance Control
The PIC17C42AT-16I/PQ controls consumer appliances such as washing machines, dishwashers, and microwave ovens where its 8-bit PIC17C core, 4 KB OTP, and 33 I/O pins provide ample headroom for keypad scanning, seven-segment display refresh, and triac-driven load switching. The industrial temperature grade is overkill for indoor appliances but useful for oven-front control boards that sit near heat sources. The 16 MHz throughput executes fuzzy-logic wash-cycle algorithms in real time, and the hardware USART interfaces with an external Bluetooth module for smart-appliance retrofits.
推荐
Automotive Body Electronics (Non-Safety)
The PIC17C42AT-16I/PQ targets automotive body-electronics modules such as seat controllers, mirror adjusters, and lighting timers, where its industrial temperature grade covers cabin environments and its 33 GPIO pins drive multi-channel LED drivers and motor bridges. The 4KB OTP stores lighting-sequence and seat-memory profiles, while the hardware USART interfaces with the body-control network gateway. For non-safety automotive modules the PIC17C42A is sufficient, but safety-critical applications like airbag controllers must migrate to AEC-Q100-qualified parts. The MQFP-44 footprint simplifies thermal management on metal-chassis modules.
推荐
推荐产品汇总
工程参考数据： PIC17C42AT-16I/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 | PIC17C42A-16I/PQ | PIC17C42AT-16I/PT | PIC17C42AT-16I/P | PIC17C42A-33I/PQ |
|---|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - same | 44-TQFP - very close | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 33 MHz |
| Program Memory | 4 KB (2K x 16) OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP |
| RAM | 232 B | 232 B | 232 B | 232 B | 232 B |
| GPIO Pins | 33 | 33 | 33 | 33 | 33 |
| USART | Yes (hardware) | Yes | Yes | Yes | Yes |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Industrial | Industrial |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND |
关键差异点
- Higher 33 I/O count and 16 MIPS throughput vs PIC16 baseline （对比 PIC16F877A)
- Tape-and-reel packaging ready for high-volume SMT assembly （对比 PIC17C42A-16I/PQ (tray))
- Industrial -40C to +85C temperature grade （对比 PIC17C42AT-16/PQ (commercial 0C to +70C))
设计说明
The 'T' suffix denotes OTP (one-time programmable) memory. Once programmed, the PIC17C42AT-16I/PQ cannot be erased or re-programmed. Engineers must validate firmware on a windowed ceramic (JW) variant such as PIC17C42A-16/JW before committing to OTP for production. Failing to do so is the most common cause of field scrap on PIC17C designs.
The 44-MQFP package has 0.8 mm lead pitch and 10x10 mm body, requiring fine-pitch PCB assembly. Use ENIG surface finish on the PCB pads and a 4-layer stackup with a solid ground plane directly under the IC to control EMI on the USART lines. Place the decoupling capacitors (100 nF ceramic plus 10 uF tantalum) within 5 mm of the Vdd/Vss pin pairs (pins 20, 30 for Vdd; pins 10, 19, 29 for Vss).
PIC17C42A Vdd operating range is 4.5V to 6.0V (typical 5V), exceeding the PIC16LF range. Power-rail design must include a 5V LDO or switching regulator rated for the MCU's 25 mA active current plus I/O sink current. Reset circuit: connect MCLR (pin 1) to Vdd through a 10 kohm pull-up and to ground through a 100 nF capacitor for a 1 ms power-on reset delay, per the Microchip PIC17C datasheet.
合规信息
PIC17C42AT-16I/PQ is NRND by Microchip. RoHS/lead-free status not stated explicitly in the verified web data and should be confirmed with Microchip before use in RoHS-restricted designs. Not AEC-Q100 qualified.
