PIC16LC621AT-04E/SO - 8-Bit 4MHz OTP MCU, 1.75KB, 18-SOIC | Microchip
料号： PIC16LC621AT-04E/SO ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
PIC16LC621AT-04E/SO 概述
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (ROM/EPROM/Flash), data memory (RAM), and peripheral interfaces such as timers, I/O ports, and communication modules. Within the semiconductor hierarchy, an MCU is a sub-class of embedded processor -> microprocessor -> digital IC. The PIC16LC621A specifically belongs to Microchip's mid-range PIC16 family, characterized by a 14-bit instruction set, two-level hardware stack, and Harvard-style separate program/data buses.
Key features of the PIC16LC621AT-04E/SO include 13 I/O pins, seven or eight special function hardware registers, and direct, indirect, and relative addressing modes. It is rated for the automotive operating temperature range (per the 'E' designator) and uses One-Time Programmable (OTP) EPROM for code storage, making it suitable for low-to-medium volume production. The device supports Watchdog Timer, power-on reset, and sleep low-power modes typical of the PIC mid-range architecture.
Technically, the PIC16LC621A employs a RISC instruction set with most instructions executing in a single instruction cycle (4 oscillator clocks). Its CMOS process yields low power consumption, and the 'LC' variant specifies a low-voltage (2.5 V minimum) operation, ideal for battery-backed or 3.3 V-only systems. The 18-SOIC package offers an industry-standard footprint compatible with hand-soldering and automated SMT assembly.
Typical applications include automotive body controllers, low-end sensor interfaces, appliance controls, and industrial logic replacement. The OTP memory is well-suited to mature, stable firmware where field re-programmability is not required.
A key design consideration is that the 'A' suffix denotes an enhanced silicon revision; engineers should confirm register-level compatibility with older PIC16C621 firmware. OTP parts cannot be reprogrammed, so emulator or flash-based PIC16F621 prototypes are recommended during development.
This page synthesizes distributor stock data, parametric alternatives, and practical design notes not aggregated in a single place on the manufacturer datasheet, enabling faster engineering and procurement decisions.
直接替换替代料： PIC16LC621AT-04E/SO ——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： PIC16LC621AT-04E/SO （相同外形与封装尺寸） ——差异在于 Operating Temperature Range, Program Memory Size, Program Memory Type, RoHS Status, Core Architecture.
快速对比工具——选择替代料号进行并排对比：
PIC16LC621A-04E/SO
✅ 直接替换✓ 有现货
$2.25 / 个
查看数据手册 →PIC16LC621A-04/SO
✅ 直接替换✓ 有现货
$1.75 / 个
查看数据手册 →PIC16LC621AT-04/SO
✅ 直接替换📋 参考替代料（不在目录中）
PIC16LC621AT-04E/SO 最大额定值与电气特性
| Core Processor | PIC |
| Core Size | 8-bit |
| Core Series | PIC 16C |
| Clock Speed (Max) | 4 MHz |
| Program Memory Size | 1.75 KB (1K x 14) |
| Program Memory Type | OTP EPROM |
| RAM Size | 96 x 8 bytes |
| Number of I/O Pins | 13 |
| Supply Voltage Range | 2.5 V to 6.25 V |
| Instruction Word Width | 14-bit |
| Data Path Width | 8-bit |
| 工作温度范围 | Automotive (E suffix) |
| 封装 / 外壳 | 18-SOIC (0.300 inch, plastic) |
| 安装类型 | Surface Mount |
PIC16LC621AT-04E/SO 引脚配置
| 引脚 1 | MCLR/VPP — Master clear reset (active low) / programming voltage input |
| 引脚 2 | RA0 — PORTA bit 0 (digital I/O) |
| 引脚 3 | RA1 — PORTA bit 1 (digital I/O) |
| 引脚 4 | RA2 — PORTA bit 2 (digital I/O) |
| 引脚 5 | RA3 — PORTA bit 3 (digital I/O) |
| 引脚 6 | RA4 — PORTA bit 4 (digital I/O, open-drain option) |
| 引脚 7 | VSS — Ground reference |
| 引脚 8 | OSC1 — Oscillator input / external clock input |
| 引脚 9 | OSC2 — Oscillator output (crystal mode) |
| 引脚 10 | RB0 — PORTB bit 0 (digital I/O, interrupt-on-change) |
| 引脚 11 | RB1 — PORTB bit 1 (digital I/O, interrupt-on-change) |
| 引脚 12 | RB2 — PORTB bit 2 (digital I/O, interrupt-on-change) |
| 引脚 13 | RB3 — PORTB bit 3 (digital I/O, interrupt-on-change) |
| 引脚 14 | RB4 — PORTB bit 4 (digital I/O, interrupt-on-change) |
| 引脚 15 | RB5 — PORTB bit 5 (digital I/O, interrupt-on-change) |
| 引脚 16 | RB6 — PORTB bit 6 (digital I/O, interrupt-on-change, ICSP clock) |
| 引脚 17 | RB7 — PORTB bit 7 (digital I/O, interrupt-on-change, ICSP data) |
| 引脚 18 | VDD — Positive supply voltage (2.5V to 6.25V) |
典型应用
PIC16LC621AT-04E/SO 适用于 6 应用s: Automotive Body Control Modules, Low-End Sensor Interface Modules, Appliance Control Boards, Industrial Logic Replacement (Glue Logic MCU), Battery-Backed Remote Controls, Legacy Industrial Timing Modules.
Automotive Body Control Modules
The PIC16LC621AT-04E/SO's automotive-grade 'E' temperature suffix and 2.5-6.25V supply range make it a fit for body controllers managing lighting, wipers, and accessory timing. Its 4 MHz instruction rate handles debounced switch scanning, relay PWM, and LIN-style bit-banging protocols common in pre-CAN body networks. The 13 I/O pins and 96-byte RAM are sufficient for typical body-controller firmware that handles a handful of inputs and a few actuator outputs without an RTOS.
推荐
Low-End Sensor Interface Modules
With 96 bytes RAM, 13 I/O, and a 4 MHz core, the PIC16LC621AT-04E/SO fits sensor-interface modules such as thermistor conditioning, simple level switches, and 4-20 mA loop readouts. The OTP memory is appropriate for fixed calibration constants in production. Its low 2.5 V minimum supply allows direct battery operation in remote sensor nodes, and the small 18-SOIC footprint suits compact sensor housings where board area is constrained.
推荐
Appliance Control Boards
The PIC16LC621AT-04E/SO is well-suited to white-goods appliance controllers like coffee makers, microwave keypads, and small kitchen devices where cost is critical and firmware is fixed at production time. The 1.75 KB OTP holds typical state-machine firmware for button matrices, LED indicators, and triac-triggered heating elements. Its 18-SOIC package is compatible with high-volume SMT lines used in consumer appliance manufacturing.
推荐
Industrial Logic Replacement (Glue Logic MCU)
Designers often replace discrete 74HC logic with a PIC16LC621AT-04E/SO when pin count exceeds discrete gates and a small amount of programmability adds value. With 13 I/O and 4 MHz execution, the MCU can decode complex input combinations, generate timed pulse trains, and handle asynchronous events more compactly than discrete logic. The 96-byte RAM and 14-bit instructions accommodate typical state-machine or lookup-table implementations.
推荐
Battery-Backed Remote Controls
The PIC16LC621AT-04E/SO's 2.5 V minimum supply and CMOS low-power design fit battery-powered handheld transmitters for garage doors, security fobs, and simple RF remote controls. Sleep current is low enough to support multi-year coin-cell operation. The 4 MHz oscillator and 1.75 KB program memory can store rolling-code algorithms and button-debounce routines typical of sub-GHz ISM-band transmitters.
推荐
Legacy Industrial Timing Modules
The PIC16LC621AT-04E/SO is commonly found in long-lifecycle industrial timing, sequencing, and watchdog-redundant control modules where the design is stable and OTP suffices. With 4 MHz clock and 96-byte RAM, it can implement delay-line replacements, watchdog-kicker logic, and sequence-interlock functions. The automotive 'E' temp grade supports harsh factory environments, and the 18-SOIC footprint eases integration into legacy PCB layouts.
推荐
推荐产品汇总
工程参考数据： PIC16LC621AT-04E/SO ——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-04E/SO | PIC16LC621A-04/SO | PIC16LC621AT-04/SO |
|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Processor | PIC (8-bit) | PIC (8-bit) | PIC (8-bit) | PIC (8-bit) |
| Clock Speed (Max) | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP |
| RAM Size | 96 bytes | 96 bytes | 96 bytes | 96 bytes |
| Operating Temperature | Automotive (E suffix) | Automotive (E suffix) | Commercial | Commercial |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
关键差异点
- Automotive-grade temperature range （对比 PIC16LC621A-04/SO)
- Tape-and-reel packaging for SMT automation （对比 PIC16LC621A-04E/SO (without T suffix))
- Low-voltage 2.5 V operation （对比 Standard PIC16C621 (3.0 V minimum))
设计说明
PIC16LC621AT-04E/SO is OTP (One-Time Programmable) and cannot be erased or rewritten once programmed. Develop and debug firmware on a flash-based PIC16F621 or PIC16F628A prototype, then port the final hex image to OTP parts for production. Failing to use a flash development platform can cost hundreds of dollars in scrapped OTP samples during firmware iteration.
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin (pin 18), with a short trace to VSS (pin 7). For designs with large switching loads, add a 10 uF bulk capacitor near the MCU. The PIC16LC621A's internal POR (Power-On Reset) handles slow VDD rise, but rapid transients on VDD can cause unintended resets if decoupling is inadequate. Keep digital and analog ground returns separated when integrating with op-amps or sensors.
Route the MCLR/VPP pin through a 10 kohm pull-up to VDD and a 100 nF capacitor to VSS for proper reset behavior; do not leave MCLR floating. If using ICSP, do not place series resistance greater than 100 ohm on RB6/RB7 (ICSP clock/data), or programming may fail. Keep oscillator traces short and surround them with a ground guard ring to minimize EMI pickup on the OSC1/OSC2 traces.
合规信息
RoHS and lead-free status not explicitly stated in verified distributor data. The 'E' temperature suffix indicates automotive operating range but does not by itself imply AEC-Q100 qualification. Engineers requiring explicit RoHS-compliant parts should select the active PIC16F621-I/SO or PIC16F628A-I/SO, which carry current Microchip RoHS declarations.
