PIC16LC642-04I/SP - 4MHz 8-bit OTP MCU, 7KB EPROM, 28-SPDIP | Microchip
MPN: PIC16LC642-04I/SP ✓ Hoạt độngPIC16LC642-04I/SP Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC642-04I/SP — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16LC642-04I/SP (cùng hình factor và footprint) — khác nhau ở Program Memory Size, Package, Instruction Cycle Time, Timers, Mounting Type.
PIC16LC642-04/SP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C642-04I/SP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC63A-04I/SP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC63-04I/SP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C642-04/SP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC63A-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC642-04I/SP Tỷ lệ tối đa & tính chất điện
| 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 |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C (Industrial) |
| Package Type | SPDIP-28 (0.300 inch, 7.62 mm) |
| Kiểu lắp đặt | 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 |
Cấu hình chân PIC16LC642-04I/SP
| Chân 1 | MCLR/Vpp — Master Clear (reset, active low) / ICSP programming voltage input |
| Chân 2 | RA0/AN0 — Port A bit 0 / Analog input channel 0 |
| Chân 3 | RA1/AN1 — Port A bit 1 / Analog input channel 1 |
| Chân 4 | RA2/AN2 — Port A bit 2 / Analog input channel 2 |
| Chân 5 | RA3/AN3/Vref — Port A bit 3 / Analog input 3 / ADC voltage reference |
| Chân 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input (open-drain) |
| Chân 7 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| Chân 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Chân 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Chân 10 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator output / Timer 1 clock |
| Chân 11 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer 1 oscillator input / CCP2 |
| Chân 12 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| Chân 13 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Chân 14 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Chân 15 | RC5/SDO — Port C bit 5 / SPI data out |
| Chân 16 | RC6/TX/CK — Port C bit 6 / USART transmit / USART clock |
| Chân 17 | RC7/RX/DT — Port C bit 7 / USART receive / USART data |
| Chân 18 | RB0/INT — Port B bit 0 / External interrupt |
| Chân 19 | RB1 — Port B bit 1 |
| Chân 20 | RB2 — Port B bit 2 |
| Chân 21 | RB3 — Port B bit 3 |
| Chân 22 | RB4 — Port B bit 4 |
| Chân 23 | RB5 — Port B bit 5 |
| Chân 24 | RB6/PGC — Port B bit 6 / ICSP clock (programming/debug) |
| Chân 25 | RB7/PGD — Port B bit 7 / ICSP data (programming/debug) |
| Chân 26 | RE0/RD/AN5 — Port E bit 0 / Parallel slave read / Analog 5 |
| Chân 27 | RE1/WR/AN6 — Port E bit 1 / Parallel slave write / Analog 6 |
| Chân 28 | RE2/CS/AN7 — Port E bit 2 / Parallel slave chip select / Analog 7 |
| Chân 29 | VDD — Positive supply (3.0 V to 5.5 V) |
| Chân 30 | VSS — Ground reference |
Ứng dụng tiêu biểu
PIC16LC642-04I/SP phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC642-04I/SP — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Wide 3.0 V to 5.5 V supply range supports battery and 5 V designs in one part (vsPIC16C642-04I/SP)
- Industrial -40 C to +85 C temperature grade for harsh environments (vsPIC16LC642-04/SP)
- 22 programmable I/O pins with analog and peripheral multiplexing (vsPIC16LC63-04I/SP)
- OTP EPROM code security (vsPIC16F74-I/P Flash)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
