PIC16LC642-04I/SP - 4MHz 8-bit OTP MCU, 7KB EPROM, 28-SPDIP | Microchip
料号： PIC16LC642-04I/SP ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.85 | $48.50 |
| 100 | $4.3 | $430.00 |
| 500 | $3.75 | $1,875.00 |
| 1,000 | $3.2 | $3,200.00 |
PIC16LC642-04I/SP 概述
An 8-bit PIC microcontroller is a Harvard-architecture MCU that separates program and data memory, executing one instruction per clock cycle (except branches, which take two). OTP EPROM-based MCUs like the PIC16LC642 target cost-sensitive through-hole industrial designs where in-system reprogramming is not required; the 'LC' suffix denotes a low-power CMOS process node optimized for battery and quiescent-current-sensitive applications. Within the broader MCU taxonomy, this part sits at: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor.
Key features include 7 KB OTP EPROM, 176 bytes of RAM, 22 I/O pins, 8-bit A/D converter, USART, capture/compare/PWM modules, and an instruction cycle time of 250 ns at 4 MHz. The PIC16LC642-04I/SP supports both RC and crystal/ceramic resonator oscillator modes and is fully static, allowing the clock to be stopped for additional power savings.
Typical applications include industrial control panels, appliance controllers, automotive body electronics subsystems, sensor-interface nodes, and legacy through-hole designs requiring the PIC16C66 instruction-set compatibility. The wide 3.0 V to 5.5 V supply range enables direct operation from a regulated 5 V rail or a 3.3 V logic supply without level shifters.
When designing with this MCU, note that the OTP variant is one-time-programmable - firmware revisions require a new device. The 28-pin SPDIP footprint remains popular in educational kits, retrofit boards, and through-hole assembly lines where socketed replacements simplify field service. The 'I' suffix denotes industrial temperature grade, and the 'SP' suffix denotes SPDIP-28 package.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, enabling faster sourcing decisions for engineers maintaining legacy PIC16 designs.
直接替换替代料： PIC16LC642-04I/SP ——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： PIC16LC642-04I/SP （相同外形与封装尺寸） ——差异在于 Program Memory Size, Package, Instruction Cycle Time, Timers, Mounting Type.
快速对比工具——选择替代料号进行并排对比：
PIC16LC642-04/SP
✅ 直接替换✓ 有现货
$4.25 / 个
查看数据手册 →PIC16C642-04I/SP
✅ 直接替换✓ 有现货
$4.95 / 个
查看数据手册 →PIC16LC63A-04I/SP
✅ 直接替换✓ 有现货
$6.25 / 个
查看数据手册 →PIC16LC63-04I/SP
✅ 直接替换✓ 有现货
$1.85 / 个
查看数据手册 →PIC16C642-04/SP
✅ 直接替换📋 参考替代料（不在目录中）
PIC16LC63A-04/SO
✅ 直接替换✓ 有现货
$4.61 / 个
查看数据手册 →PIC16LC642-04I/SP 最大额定值与电气特性
| Product Type | 8-bit Microcontroller (MCU) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB |
| RAM Size | 176 bytes |
| Number of I/O Pins | 22 |
| Maximum Clock Speed | 4 MHz |
| Supply Voltage Range | 3.0 V to 5.5 V |
| Instruction Set Architecture | PIC16C6x RISC, 35 instructions |
| 工作温度范围 | -40 °C to +85 °C (Industrial) |
| Package Type | SPDIP-28 (0.300 inch, 7.62 mm) |
| 安装类型 | Through-Hole |
| Oscillator Mode | RC / Crystal / Ceramic Resonator |
| Temperature Grade | Industrial ('I' suffix) |
| Process Technology | Low-power CMOS (LC) |
| A/D Converter | 8-bit integrated |
| Peripherals | USART, Capture/Compare/PWM |
PIC16LC642-04I/SP 引脚配置
| 引脚 1 | MCLR/Vpp — Master Clear (reset, active low) / ICSP programming voltage input |
| 引脚 2 | RA0/AN0 — Port A bit 0 / Analog input channel 0 |
| 引脚 3 | RA1/AN1 — Port A bit 1 / Analog input channel 1 |
| 引脚 4 | RA2/AN2 — Port A bit 2 / Analog input channel 2 |
| 引脚 5 | RA3/AN3/Vref — Port A bit 3 / Analog input 3 / ADC voltage reference |
| 引脚 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input (open-drain) |
| 引脚 7 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| 引脚 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| 引脚 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| 引脚 10 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator output / Timer 1 clock |
| 引脚 11 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer 1 oscillator input / CCP2 |
| 引脚 12 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| 引脚 13 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| 引脚 14 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| 引脚 15 | RC5/SDO — Port C bit 5 / SPI data out |
| 引脚 16 | RC6/TX/CK — Port C bit 6 / USART transmit / USART clock |
| 引脚 17 | RC7/RX/DT — Port C bit 7 / USART receive / USART data |
| 引脚 18 | RB0/INT — Port B bit 0 / External interrupt |
| 引脚 19 | RB1 — Port B bit 1 |
| 引脚 20 | RB2 — Port B bit 2 |
| 引脚 21 | RB3 — Port B bit 3 |
| 引脚 22 | RB4 — Port B bit 4 |
| 引脚 23 | RB5 — Port B bit 5 |
| 引脚 24 | RB6/PGC — Port B bit 6 / ICSP clock (programming/debug) |
| 引脚 25 | RB7/PGD — Port B bit 7 / ICSP data (programming/debug) |
| 引脚 26 | RE0/RD/AN5 — Port E bit 0 / Parallel slave read / Analog 5 |
| 引脚 27 | RE1/WR/AN6 — Port E bit 1 / Parallel slave write / Analog 6 |
| 引脚 28 | RE2/CS/AN7 — Port E bit 2 / Parallel slave chip select / Analog 7 |
| 引脚 29 | VDD — Positive supply (3.0 V to 5.5 V) |
| 引脚 30 | VSS — Ground reference |
典型应用
PIC16LC642-04I/SP 适用于 6 应用s: Industrial Control Panel Logic, Appliance Controller Boards, Automotive Body Electronics (Retrofit), Sensor Interface Nodes, Educational and Prototyping Boards, Legacy Through-Hole Retrofit Designs.
Industrial Control Panel Logic
The PIC16LC642-04I/SP fits industrial control panel logic where the 22 digital I/O pins drive relays, optocouplers, keypads, and 7-segment displays while reading limit switches and contact closures. Its 3.0 V to 5.5 V supply range supports both 3.3 V and 5 V PLC backplanes, and the 7 KB OTP EPROM holds ladder-logic replacement code for legacy control firmware. With an 8-bit ADC, the MCU can read potentiometer setpoints or 4-20 mA loop shunts; its 4 MHz clock and 250 ns instruction cycle deliver deterministic 5-10 µs scan times suitable for panel scan rates of 100 Hz.
推荐
Appliance Controller Boards
White-goods appliance controllers (washing machines, dishwashers, microwave ovens) leverage the PIC16LC642-04I/SP's 22 I/O to drive triac-fired AC loads, read door interlocks, and sweep LED/LCD user interfaces. Its industrial -40 °C to +85 °C temperature range tolerates under-cabinet heat, and the OTP EPROM secures proprietary wash-cycle algorithms from competitors. The 4 MHz RISC core easily handles encoder input, water-level sensing, and timer interrupts; low 15 µA typical quiescent current at 5 V/4 MHz keeps standby power below 1 W for ENERGY STAR compliance.
推荐
Automotive Body Electronics (Retrofit)
Although not AEC-Q100 qualified by default, the PIC16LC642-04I/SP has historically been used in non-safety automotive body modules (window lift controllers, seat position memory, mirror adjust) operating from 12 V battery with internal 5 V regulation. The industrial temperature range covers cabin environments, and OTP EPROM prevents aftermarket firmware tampering. The USART enables LIN-bus-style half-duplex communication with body control modules at 9600-19200 baud, while CCP modules drive brushed DC motors for window/seat actuators.
推荐
Sensor Interface Nodes
Distributed sensor interface nodes (HVAC duct sensors, environmental monitors, vending telemetry) leverage the PIC16LC642-04I/SP's 8-bit ADC to read thermistor, RTD, or 0-10 V transducer signals and its USART to forward digitized readings over RS-485 or RS-232. The 3.0 V to 5.5 V supply accepts lithium battery packs or 24 V industrial loops with on-board regulation. With 7 KB OTP, sensor calibration tables and linearization polynomials fit comfortably; the 176-byte RAM supports 8-10 simultaneous channel reads with averaging, and the 4 MHz clock samples 100 Hz bandwidth signals without aliasing.
推荐
Educational and Prototyping Boards
University embedded-systems courses and hobbyist prototyping boards continue to use the PIC16LC642-04I/SP because its 28-SPDIP through-hole package is socket-friendly and survives repeated insertion cycles. The PIC16C6x 35-instruction RISC core is widely taught in textbooks, and the 7 KB EPROM holds complete reference projects (blinky LEDs, UART echo, ADC scan, PWM motor control) without bank-switching complexities. MPIDE- and MPLAB-X-compatible toolchains including the PICkit-3 programmer support this device, making it an ideal platform for teaching core MCU concepts.
推荐
Legacy Through-Hole Retrofit Designs
Long-life industrial products (10-20 year service life) including railway signaling interfaces, military COTS spares, and avionics subsystems continue to source the PIC16LC642-04I/SP because their PCB designs and firmware were qualified against this exact OTP die. The 28-SPDIP through-hole package supports hand-soldering rework in field service scenarios, and OTP EPROM guarantees bit-exact firmware matching across production batches. The PIC16C6x instruction set is fully supported by legacy Microchip assembler toolchains still in use at many aerospace and defense integrators.
推荐
推荐产品汇总
工程参考数据： PIC16LC642-04I/SP ——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 | PIC16LC642-04/SP | PIC16C642-04I/SP | PIC16LC63A-04I/SP | PIC16LC63-04I/SP |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SPDIP-28 | SPDIP-28 - same | SPDIP-28 - same | SPDIP-28 - same | SPDIP-28 - same |
| Program Memory | 7 KB OTP EPROM | 7 KB OTP EPROM | 7 KB OTP EPROM | 7 KB EPROM | 4 KB EPROM (-43%) |
| RAM | 176 bytes | 176 bytes | 176 bytes | 192 bytes (+9%) | 192 bytes (+9%) |
| Maximum Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage Range | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 4.0 V to 6.0 V (5V only) | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| I/O Pins | 22 | 22 | 22 | 22 | 22 |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | EPROM (windowed/OTP) | EPROM (windowed/OTP) |
关键差异点
- Wide 3.0 V to 5.5 V supply range supports battery and 5 V designs in one part （对比 PIC16C642-04I/SP)
- Industrial -40 C to +85 C temperature grade for harsh environments （对比 PIC16LC642-04/SP)
- 22 programmable I/O pins with analog and peripheral multiplexing （对比 PIC16LC63-04I/SP)
- OTP EPROM code security （对比 PIC16F74-I/P Flash)
设计说明
Estimated: At VDD=5V and 4 MHz oscillator, the PIC16LC642-04I/SP draws approximately 2-3 mA active current plus 15 uA typical quiescent. Add a 100 nF ceramic decoupling capacitor as close as possible to VDD pin 11 and a 10 uF bulk capacitor at the board input. The MCLR pin (pin 1) requires a 10 kohm pull-up to VDD and a 100 nF cap to ground for noise-free reset - omit the cap only if not using ICSP.
When laying out the SPDIP-28 footprint, allow 0.1 inch (2.54 mm) pin pitch with 0.6 mm drill holes and 1.0 mm pads minimum. Route OSC1/OSC2 traces (pins 8-9) as short as possible (under 12 mm) and keep them away from digital switching lines to avoid injecting noise into the crystal oscillator. If using a high-speed external clock, place a series 33 ohm resistor near OSC1 to dampen reflections.
OTP EPROM devices can be programmed only once - any bit already programmed to 0 cannot be returned to 1. Plan code revisions carefully: use a fresh blank device for each firmware revision, not the same IC. The ICSP programming voltage on MCLR/Vpp requires 13.0 V to 14.0 V (Vpp range from datasheet) - exceeding 14 V damages the device permanently. Brown-out detection should be enabled in configuration fuses for industrial reliability.
The PIC16LC642-04I/SP is fully static, meaning the clock can be stopped indefinitely without losing state - useful for low-power applications where the MCU wakes via interrupt, processes data, and returns to sleep with clock gated. However, the ADC requires the system clock to be active during conversion; switch to RC oscillator mode during ADC reads for minimum noise coupling. The 8-bit ADC has typical input impedance around 10 kohm - use a buffer op-amp or allow sufficient acquisition time (>=19.5 us at 4 MHz) when reading high-impedance sources.
合规信息
RoHS/REACH status not specified in the Verified Web Data for PIC16LC642-04I/SP - marked [DATA_NEEDED]. This part is not AEC-Q100 qualified; for automotive safety-critical applications, choose a modern PIC16F1x or dsPIC variant with explicit AEC-Q100 documentation. The standard SPDIP-28 package may use lead-containing solder plating depending on date code - verify RoHS status with distributor lot certificates before placing into lead-free assembly lines.
