PIC16LC621-04/P - 4MHz 8-bit OTP MCU, 1.75KB, 18-DIP | Microchip
料号： PIC16LC621-04/P ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.7 | $2.70 |
| 10 | $2.45 | $24.50 |
| 100 | $2.17 | $217.00 |
| 500 | $1.92 | $960.00 |
| 1,000 | $1.65 | $1,650.00 |
PIC16LC621-04/P 概述
An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. Within the broader taxonomy it sits under microprocessor -> microcontroller -> 8-bit MCU -> CMOS RISC MCU. The PIC16LC62x family in particular is part of Microchip's mid-range PIC architecture, which uses a Harvard-style separate program/data bus and a small, deterministic instruction set well-suited to real-time control. The LC (low-power CMOS) suffix indicates the part is optimized for low quiescent current and supports a wide supply range, making it appropriate for battery-powered and industrial systems.
Key features include 35 single-cycle instructions (only program branches take two cycles), 12 I/O pins with individual direction control, a two-level deep hardware stack, and support for direct, indirect, and relative addressing modes. The device has seven or eight special function hardware registers and an integrated power-on reset / brown-out detection block (typical for the family). The 'LC' process node enables supply operation from approximately 2.5 V to 6.25 V with reduced active current compared to the standard 'C' EPROM variants.
Architecturally the PIC16LC621 uses a RISC core with a fixed 14-bit instruction word and 8-bit data path, giving it deterministic interrupt latency and instruction timing - a key reason these MCUs remain popular in cost-sensitive motor control, sensor conditioning, and appliance designs. The 4 MHz speed grade in this part denotes a maximum oscillator input of 4 MHz, yielding a 200 ns instruction cycle. The OTP (One-Time Programmable) program memory is windowless and intended for production volumes where code is finalized.
Typical applications include low-cost white goods control (washing machines, microwave ovens), HVAC fan and damper control, simple sensor interface boards, IR remote receivers, and small appliance key-scan matrices. The wide 2.5-6.25 V supply range also makes it suitable for 3.3 V or 5 V industrial sensor nodes.
When designing with this MCU, allocate the 1.75 KB program memory carefully - it accommodates roughly 1K single-word instructions. Because this is an OTP part, code must be fully debugged before programming; use the UV-erasable PIC16C621 windowed variant during development, then move to PIC16LC621-04/P for production.
This page synthesizes current distributor pricing, drop-in alternative listings (same-brand first), and practical design notes not aggregated on any single manufacturer or distributor page, providing a single reference for engineers qualifying the PIC16LC621-04/P.
直接替换替代料： PIC16LC621-04/P ——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： PIC16LC621-04/P （相同外形与封装尺寸） ——差异在于 Program Memory Size, Core Architecture, Operating Temperature Range, Instruction Cycle Time, Package Type.
快速对比工具——选择替代料号进行并排对比：
PIC16LC621A-04/P
✅ 直接替换📋 参考替代料（不在目录中）
PIC16LC620A-04/P
✅ 直接替换✓ 有现货
$1.3 / 个
查看数据手册 →PIC16LC620-04/P
✅ 直接替换✓ 有现货
$1.85 / 个
查看数据手册 →PIC16LC621-04I/P
✅ 直接替换✓ 有现货
$2.54 / 个
查看数据手册 →PIC16LC621A-04I/P
✅ 直接替换✓ 有现货
$1.01 / 个
查看数据手册 →PIC16LC621-04/P 最大额定值与电气特性
| Core Architecture | PIC 8-bit RISC |
| Program Memory Type | OTP (EPROM-based) |
| Program Memory Size | 1.75 KB (1K x 14) |
| RAM Size | 80 bytes |
| 最大时钟频率 | 4 MHz |
| Instruction Cycle Time | 200 ns (single cycle) |
| Instruction Set Size | 35 instructions |
| Supply Voltage Range | 2.5 V to 6.25 V |
| I/O Pins | 13 |
| 数据总线宽度 | 8-bit |
| Instruction Word Width | 14-bit |
| Stack Depth | 2 levels (hardware) |
| Package Type | 18-pin PDIP (DIP-18, 0.300 inch) |
| 安装类型 | Through-Hole |
| 工作温度范围 | 0C to +70C (Commercial) |
| Address Modes | Direct, Indirect, Relative |
| Special Function Registers | 7 to 8 |
PIC16LC621-04/P 引脚配置
| 引脚 1 | RA2 — Bidirectional I/O, PORTA bit 2 |
| 引脚 2 | RA3 — Bidirectional I/O, PORTA bit 3 |
| 引脚 3 | RA4/T0CKI — Bidirectional I/O / Timer0 clock input |
| 引脚 4 | MCLR/VPP — Master Clear (Reset) / Programming voltage |
| 引脚 5 | VSS — Ground reference |
| 引脚 6 | RB0/INT — Bidirectional I/O / External interrupt |
| 引脚 7 | RB1 — Bidirectional I/O, PORTB bit 1 |
| 引脚 8 | RB2 — Bidirectional I/O, PORTB bit 2 |
| 引脚 9 | RB3 — Bidirectional I/O, PORTB bit 3 |
| 引脚 10 | RB4 — Bidirectional I/O, PORTB bit 4 |
| 引脚 11 | RB5 — Bidirectional I/O, PORTB bit 5 |
| 引脚 12 | RB6 — Bidirectional I/O, PORTB bit 6 |
| 引脚 13 | RB7 — Bidirectional I/O, PORTB bit 7 |
| 引脚 14 | VDD — Positive supply voltage |
| 引脚 15 | OSC2/CLKOUT — Oscillator crystal output / Clock out |
| 引脚 16 | OSC1/CLKIN — Oscillator crystal input / External clock in |
| 引脚 17 | RA0 — Bidirectional I/O, PORTA bit 0 |
| 引脚 18 | RA1 — Bidirectional I/O, PORTA bit 1 |
典型应用
PIC16LC621-04/P 适用于 6 应用s: White Goods Control, IR Remote Receiver Decoder, HVAC Fan and Damper Control, Small Appliance Key-Scan Matrix, Industrial Sensor Interface Board, Battery-Powered Sensor Node.
White Goods Control
The PIC16LC621-04/P's 1.75 KB OTP program memory and 13 GPIO pins make it well suited for low-cost white goods controllers such as microwave ovens, washing machines, and dishwashers. Its 4 MHz core delivers a 200 ns instruction cycle, fast enough for keypad scanning, relay sequencing, and triac-based heater control loops typical in appliance main boards. The wide 2.5 V to 6.25 V supply tolerance allows direct connection to rectified 5 V or 3.3 V rails without additional regulators, simplifying the BOM.
推荐
IR Remote Receiver Decoder
With 35 single-cycle instructions and a deterministic 200 ns instruction cycle, the PIC16LC621-04/P can decode common IR protocols (RC5, NEC, Sony SIRC) directly in software using a single external interrupt pin. The 80-byte RAM is sufficient for protocol state machines and timing buffers, while the OTP program memory locks the decoded command set against field tampering. Its 13 GPIO pins comfortably drive status LEDs and relay outputs.
推荐
HVAC Fan and Damper Control
The PIC16LC621-04/P's CMOS LC process supports the wide 2.5-6.25 V supply range needed for 24 V industrial HVAC control boards with simple LDO regulation. Its 13 GPIO pins can drive multiple TRIAC optocouplers for fan speed selection and damper actuators, while the 4 MHz clock enables precise PWM-based motor control. The OTP memory prevents firmware tampering in field-deployed HVAC systems.
推荐
Small Appliance Key-Scan Matrix
For small kitchen and personal-care appliances, the PIC16LC621-04/P can scan a 4x4 or larger key matrix using its 13 GPIO pins with minimal external components. The Harvard architecture and predictable interrupt response allow deterministic debounce handling and multi-key rollover detection. OTP memory keeps per-SKU firmware locked at production cost, ideal for high-volume appliance lines.
推荐
Industrial Sensor Interface Board
The PIC16LC621-04/P's 13 GPIO pins and 80-byte RAM support simple 4-20 mA or 0-10 V sensor signal conditioning boards that require local display driving and relay outputs. The 4 MHz instruction cycle allows polling of multiple sensor channels at sub-millisecond rates. Its commercial 0C to +70C operating range and through-hole PDIP package suit industrial control panels where socketed replacement and hand-prototyping remain common.
推荐
Battery-Powered Sensor Node
The 'LC' low-power CMOS process of the PIC16LC621-04/P reduces active current draw versus standard CMOS variants, making it usable in battery-powered wireless sensor transmitters and remote controls. The 2.5 V to 6.25 V supply range allows direct operation from 2xAA alkaline or single Li-ion cells. Its 13 GPIO pins can wake from sleep on a sensor event and drive an RF transmitter for short-range data links.
推荐
推荐产品汇总
工程参考数据： PIC16LC621-04/P ——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 | PIC16LC621A-04/P | PIC16LC620A-04/P | PIC16LC620-04/P | PIC16LC621-04I/P | PIC16LC621A-04I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-pin PDIP (DIP-18) | 18-pin PDIP (DIP-18) | 18-pin PDIP (DIP-18) | 18-pin PDIP (DIP-18) | 18-pin PDIP (DIP-18) | 18-pin PDIP (DIP-18) |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 896 B OTP | 896 B OTP | 1.75 KB OTP | 1.75 KB OTP |
| RAM | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 80 bytes |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Supply Voltage | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V |
| Temperature Grade | Commercial (0C to +70C) | Commercial | Commercial | Commercial | Industrial (-40C to +85C) | Industrial (-40C to +85C) |
| Mounting Type | Through-Hole (PDIP) | Through-Hole (PDIP) | Through-Hole (PDIP) | Through-Hole (PDIP) | Through-Hole (PDIP) | Through-Hole (PDIP) |
关键差异点
- Enhanced CMOS revision with identical footprint （对比 PIC16LC621A-04/P)
- Industrial temperature grade variant available （对比 PIC16LC621-04I/P)
- Lower-memory variant in same package （对比 PIC16LC620A-04/P)
设计说明
PIC16LC621-04/P is OTP (One-Time Programmable) - firmware cannot be erased or rewritten. Develop and debug firmware on the UV-erasable windowed PIC16C621 variant or on a Flash-based PIC16F84A/16F88 development platform first. Once programmed into the OTP LC621, any code bug requires a new chip, increasing rework cost on production lines. Always verify code with the MPLAB simulator and an emulator or ICD before committing.
PIC16LC621-04/P lacks an internal voltage regulator, so VDD must be tightly regulated to within 2.5 V to 6.25 V. Add a 100 nF decoupling capacitor close to VDD (pin 14) and a 10 uF bulk capacitor on the supply rail. Brown-out reset is selectable via configuration fuses; enable BOR for reliable operation in electrically noisy environments like motor control or relay-driven systems. For battery-powered designs, leverage the SLEEP instruction to reduce quiescent current to typical LC-family levels.
The 18-pin PDIP through-hole package accommodates both wave soldering and hand-prototyping with DIP sockets - use machined-pin sockets for production programming and field replacement. Keep the 4 MHz crystal or resonator (typically a 4.000 MHz AT-cut type with 22-33 pF loading caps) within 5 mm of OSC1/OSC2 pins to minimize EMI and start-up issues. Route the MCLR/VPP pin with a 10 kΩ pullup to VDD and place the reset circuit close to the MCU to avoid spurious triggering.
Estimate: PORTB internal weak pull-ups (typically 50-100 kΩ) can source limited current - do not use them to drive LEDs directly without a buffer transistor. For high-current loads (relays, solenoids, triacs), use a dedicated driver IC such as a ULN2003 or MOC3021 optocoupler on the GPIO pin. Isolate noisy analog sections from the MCU's digital traces with a ground plane and keep the crystal traces short and symmetric to reduce radiated EMI.
合规信息
RoHS and lead-free compliance per Microchip product page. PIC16LC621-04/P is not AEC-Q100 qualified - choose automotive-grade PIC variants for vehicle applications. Halogen-free status not explicitly stated in the verified data.
