PIC16LC74AT-04I/PT - 8-bit MCU, 7KB OTP, 33 I/O, 4MHz | Microchip
料号： PIC16LC74AT-04I/PT ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $7.95 | $79.50 |
| 100 | $6.95 | $695.00 |
| 500 | $5.85 | $2,925.00 |
| 1,000 | $4.95 | $4,950.00 |
PIC16LC74AT-04I/PT 概述
An OTP microcontroller is a type of embedded processor whose program memory can be written exactly once during production programming, not repeatedly rewritten like flash-based MCUs. The PIC16LC74A belongs to Microchip's mid-range PIC16 family, which sits within the broader 8-bit microcontroller category and serves cost-effective deterministic control tasks where simpler processing suffices than 16-bit or 32-bit cores.
Key features include an integrated Analog-to-Digital (A/D) converter, capture/compare/PWM (CCP) modules, multiple timers, and a synchronous/asynchronous serial port. The device uses a Harvard architecture with separate program and data buses, providing deterministic instruction execution suitable for real-time control. The 'LC' suffix indicates the low-voltage CMOS variant optimized for demanding 3.3V to 5V operation with reduced power consumption.
Architecturally, the PIC16LC74AT-04I/PT employs a 14-bit instruction word with 35 instructions, providing a favorable code-density versus MCU capability ratio for embedded control applications. The 'T' suffix indicates tape-and-reel packaging for high-volume assembly, while the 'I' suffix denotes the industrial temperature range of -40C to +85C.
Typical applications include industrial process control, automotive body electronics, sensor signal conditioning, motor control, and consumer white goods. The integrated A/D converter with multiple channels makes the device suitable for analog sensor interfaces in cost-sensitive embedded designs.
When designing with this device, ensure the program memory is correctly allocated before OTP programming since OTP memory cannot be erased. Plan for the industrial temperature range and implement appropriate watchdog reset strategies for reliable operation in electrically harsh industrial environments.
直接替换替代料： PIC16LC74AT-04I/PT ——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： PIC16LC74AT-04I/PT （相同外形与封装尺寸） ——差异在于 Core Architecture, Package, Operating Temperature Range, ADC, Program Memory Size.
快速对比工具——选择替代料号进行并排对比：
PIC16LC74A-04I/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.35 / 个
查看数据手册 →PIC16LC74A-04I/PQ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$5.1 / 个
查看数据手册 →PIC16F74-I/PT
✅ 直接替换✓ 有现货
$5.55 / 个
查看数据手册 →PIC16F747-I/PT
✅ 直接替换✓ 有现货
$4.4 / 个
查看数据手册 →PIC16LC64AT-04I/PT
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC16LC65AT-04I/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$7.8 / 个
查看数据手册 →PIC16LC74AT-04I/PT 最大额定值与电气特性
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | PIC RISC, 14-bit instruction word |
| Program Memory Size | 7 KB (OTP) |
| RAM Size | 192 bytes |
| Number of I/O Pins | 33 |
| 最大时钟频率 | 4 MHz |
| 工作电源电压 | 3.3 V to 5 V |
| A/D Converter | Yes (integrated, multi-channel) |
| 封装 | 44-TQFP (PT) |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40 C to +85 C (Industrial) |
| Series | PIC16LC74A |
| Instruction Set | 35 instructions |
| Program Memory Type | OTP (One-Time Programmable) |
| Peripherals | CCP, Timers, USART/SCI, A/D converter |
PIC16LC74AT-04I/PT 引脚配置
| 引脚 1 | OSC1 — Oscillator input |
| 引脚 2 | OSC2 — Oscillator output |
| 引脚 3 | MCLR — Master clear reset |
| 引脚 4 | RA0 — I/O port A bit 0 |
| 引脚 5 | RA1 — I/O port A bit 1 |
| 引脚 6 | RA2 — I/O port A bit 2 |
| 引脚 7 | RA3 — I/O port A bit 3 |
| 引脚 8 | RA4 — I/O port A bit 4 |
| 引脚 9 | RA5 — I/O port A bit 5 |
| 引脚 10 | VSS — Ground |
| 引脚 11 | VDD — Positive supply voltage |
| 引脚 12 | RB0 — I/O port B bit 0 |
| 引脚 13 | RB1 — I/O port B bit 1 |
| 引脚 14 | RB2 — I/O port B bit 2 |
| 引脚 15 | RB3 — I/O port B bit 3 |
| 引脚 16 | RB4 — I/O port B bit 4 |
| 引脚 17 | RB5 — I/O port B bit 5 |
| 引脚 18 | RB6 — I/O port B bit 6 |
| 引脚 19 | RB7 — I/O port B bit 7 |
| 引脚 20 | RC0 — I/O port C bit 0 |
| 引脚 21 | RC1 — I/O port C bit 1 |
| 引脚 22 | RC2 — I/O port C bit 2 |
| 引脚 23 | RC3 — I/O port C bit 3 |
| 引脚 24 | RC4 — I/O port C bit 4 |
| 引脚 25 | RC5 — I/O port C bit 5 |
| 引脚 26 | RC6 — I/O port C bit 6 |
| 引脚 27 | RC7 — I/O port C bit 7 |
| 引脚 28 | RD0 — I/O port D bit 0 |
| 引脚 29 | RD1 — I/O port D bit 1 |
| 引脚 30 | RD2 — I/O port D bit 2 |
| 引脚 31 | RD3 — I/O port D bit 3 |
| 引脚 32 | RD4 — I/O port D bit 4 |
| 引脚 33 | RD5 — I/O port D bit 5 |
| 引脚 34 | RD6 — I/O port D bit 6 |
| 引脚 35 | RD7 — I/O port D bit 7 |
| 引脚 36 | RE0 — I/O port E bit 0 |
| 引脚 37 | RE1 — I/O port E bit 1 |
| 引脚 38 | RE2 — I/O port E bit 2 |
| 引脚 39 | VSS — Ground |
| 引脚 40 | VDD — Positive supply voltage |
| 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
PIC16LC74AT-04I/PT 适用于 6 应用s: Industrial Process Control, Sensor Signal Conditioning, Motor Control Systems, Consumer White Goods, Automotive Body Electronics, HVAC Control Systems.
Industrial Process Control
The PIC16LC74AT-04I/PT fits industrial process control with its 33 I/O pins, integrated A/D converter, and -40C to +85C industrial temperature range. The 7 KB OTP memory stores control loop firmware, while 192 bytes RAM manages real-time variables. The 3.3V to 5V operating voltage suits both legacy 5V and modern 3.3V industrial systems. Compared to newer 32-bit controllers, the PIC16LC74AT-04I/PT provides deterministic RISC execution at 4 MHz for predictable control loop timing.
推荐
Sensor Signal Conditioning
The PIC16LC74AT-04I/PT handles sensor signal conditioning with its integrated multi-channel A/D converter reading analog sensors and producing processed outputs. The 33 I/O pins connect various analog and digital sensors simultaneously, while 4 MHz clock provides 1 MIPS for filtering algorithms. OTP memory suits high-volume sensor modules where firmware is fixed at production. The industrial temperature range supports factory floor and outdoor sensor installations.
推荐
Motor Control Systems
The PIC16LC74AT-04I/PT fits motor control with PWM generation, galvanometer sensors, and GPIO for H-bridge control. The CCP module produces PWM signals for DC motor speed control, while A/D reads current sensing feedback for closed-loop control. Industrial temperature range supports motor drive environments. The 4 MHz clock generates sufficient PWM resolution for typical motor control frequencies up to 20 kHz.
推荐
Consumer White Goods
The PIC16LC74AT-04I/PT suits consumer white goods like washing machines, dishwashers, and microwave ovens where cost-effective 8-bit control suffices. OTP memory prevents unauthorized firmware copying in high-volume production, while 33 I/O pins interface with displays, keypads, and actuators. The integrated A/D reads temperature and humidity sensors. Industrial temperature range covers appliance operating environments.
推荐
Automotive Body Electronics
The PIC16LC74AT-04I/PT handles automotive body electronics like seat controllers, mirror adjusters, and interior lighting where non-safety-critical control is acceptable. The 33 I/O pins drive multiple loads while A/D reads position sensors. Industrial temperature range supports cabin environments. However, for safety-critical applications, an AEC-Q100 qualified part is required rather than this industrial-grade device.
推荐
HVAC Control Systems
The PIC16LC74AT-04I/PT controls HVAC systems with its multi-channel A/D reading temperature sensors and PWM outputs driving fan motors and damper actuators. The 7 KB OTP stores control algorithms for thermostat operation, while 33 I/O pins interface with keypads and displays. Industrial temperature range handles equipment room environments. The deterministic RISC architecture provides predictable response for safety interlocks.
推荐
推荐产品汇总
工程参考数据： PIC16LC74AT-04I/PT ——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 | PIC16LC74A-04I/PT | PIC16LC74A-04I/PQ | PIC16F74-I/PT | PIC16F747-I/PT | PIC16LC64AT-04I/PT | PIC16LC65AT-04I/PT |
|---|---|---|---|---|---|---|---|
| Package | 44-TQFP (PT) | 44-TQFP (PT) - same | 44-MQFP (PQ) - close variant | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash | 7 KB Flash | 3.5 KB OTP (-50%) | 7 KB OTP |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz (+400%) | 20 MHz (+400%) | 4 MHz | 4 MHz |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 128 bytes | 192 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Operating Voltage | 3.3V to 5V | 3.3V to 5V | 3.3V to 5V | 2V to 5.5V | 2V to 5.5V | 3.3V to 5V | 3.3V to 5V |
| Memory Type | OTP | OTP | OTP | Flash (upgrade) | Flash (upgrade) | OTP | OTP |
关键差异点
- OTP memory for production security （对比 PIC16F74-I/PT)
- Lower cost for high-volume production （对比 PIC16F747-I/PT)
- 44-TQFP package with 33 I/O pins （对比 PIC16LC64AT-04I/PT)
设计说明
OTP (One-Time Programmable) memory cannot be erased after programming. Verify firmware thoroughly using a Flash-equivalent development part (such as PIC16F74-I/PT in the same 44-TQFP package) before committing to OTP production programming. A single bit error in production programming results in a scrapped device.
The 'LC' suffix indicates low-voltage CMOS operation from 3.3V to 5V. Ensure the power supply decoupling network includes a 100nF ceramic capacitor close to each VDD pin (multiple VDD pins exist on the 44-TQFP package). For battery applications, leverage the LC variant's lower quiescent current versus the standard F variant.
The industrial temperature range of -40C to +85C requires verification of oscillator stability across the full temperature range. The 4 MHz clock requires that crystal loading capacitance is correctly matched. For high-temperature operation near 85C, consider derating clock frequency by 10% to ensure timing margins.
合规信息
Compliance information not directly stated in the verified web data. The part was published in 1997 per FindIC, predating the historical RoHS directive effective dates. Not suitable for AEC-Q100 automotive applications.