PIC16LC74A-04I/PT - 8-Bit MCU, 4MHz, 7KB OTP, 44-TQFP | Microchip
料号： PIC16LC74A-04I/PT ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.89 | $48.90 |
| 100 | $4.32 | $432.00 |
| 500 | $3.78 | $1,890.00 |
| 1,000 | $3.35 | $3,350.00 |
PIC16LC74A-04I/PT 概述
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), data memory (RAM), I/O peripherals, and often timers, communication interfaces, and analog blocks. The PIC16C family sits within Microchip's mid-range architecture (14-bit instruction word), providing a balance of code density, peripheral integration, and deterministic interrupt response. Microcontrollers sit within the broader taxonomy of embedded processors -> microcontrollers -> 8-bit microcontrollers -> CMOS microcontrollers -> mid-range MCUs.
Key features of the PIC16LC74A-04I/PT include its 4 MHz maximum oscillator frequency, integrated 8-bit A/D converter, USART/SCI and SSP (SPI/I2C) communication peripherals, multiple 8/16-bit timer modules, and 33 digital I/O lines. The wide operating voltage range and CMOS process yield low current typical draw at full operation, making it suitable for battery-powered and industrial applications.
Architecturally, the PIC16LC74A uses a Harvard RISC core with 14-bit-wide instructions and 8-bit-wide data, allowing single-cycle instruction execution except for branches (2 cycles). The OTP program memory supports one-time programming for low-volume or production units where code stability is paramount, while the on-chip peripherals are mapped via a banked register architecture familiar to PIC mid-range developers.
Typical applications include industrial control systems, automotive subsystems (non-safety-critical), appliance controls, sensor signal conditioning, low-speed data acquisition, and embedded control loops where deterministic timing and a mature toolchain (MPLAB, MPASM, C18) are valued. The 44-TQFP package provides ample I/O for moderate-complexity designs.
When designing with this part, note that OTP memory cannot be re-programmed in-circuit; for prototype iterations, choose a Flash-based sibling such as the PIC16F74 or PIC16F874 in the same package. The 'I' suffix denotes the industrial temperature grade (-40C to +85C), and 'LC' denotes the low-voltage CMOS process variant.
直接替换替代料： PIC16LC74A-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： PIC16LC74A-04I/PT （相同外形与封装尺寸） ——差异在于 Package, Core Architecture, ADC, Timers, Serial Interfaces.
快速对比工具——选择替代料号进行并排对比：
PIC16F74-I/PT
✅ 直接替换✓ 有现货
$5.55 / 个
查看数据手册 →PIC16LC74A-04I/PQ
✅ 直接替换✓ 有现货
$5.1 / 个
查看数据手册 →PIC16LC74A-04/PT
✅ 直接替换✓ 有现货
$3.75 / 个
查看数据手册 →PIC16F874-I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC16F747-I/PT
✅ 直接替换✓ 有现货
$4.4 / 个
查看数据手册 →PIC16F887-I/PT
✅ 直接替换✓ 有现货
$1.66 / 个
查看数据手册 →PIC16LC74A-04I/PT 最大额定值与电气特性
| Core Architecture | PIC 8-bit (PIC16C mid-range, 14-bit instruction) |
| Program Memory | 7 KB (4K x 14) OTP |
| Data RAM | 192 bytes |
| 最大时钟频率 | 4 MHz |
| I/O Pins | 33 |
| 封装 | 44-pin TQFP (10x10 mm) |
| 安装类型 | Surface Mount |
| Temperature Grade | Industrial (-40C to +85C) |
| A/D Converter | 8-bit integrated |
| Communication Peripherals | USART/SCI, SSP (SPI/I2C) |
| Timer Modules | Multiple 8/16-bit timers |
| 存储器类型 | OTP (One-Time Programmable) |
PIC16LC74A-04I/PT 引脚配置
| 引脚 1 | OSC1/CLKI — Oscillator input / external clock |
| 引脚 2 | OSC2/CLKO — Oscillator output |
| 引脚 3 | MCLR/VPP — Reset input / programming voltage |
| 引脚 4 | RA0/AN0 — Digital I/O / analog input 0 |
| 引脚 5 | RA1/AN1 — Digital I/O / analog input 1 |
| 引脚 6 | RA2/AN2 — Digital I/O / analog input 2 |
| 引脚 7 | RA3/AN3/VREF — Digital I/O / analog input 3 / A/D reference |
| 引脚 8 | RA4/T0CKI — Digital I/O / Timer0 clock |
| 引脚 9 | RA5/AN4/SS — Digital I/O / analog input 4 / SPI slave select |
| 引脚 10 | VSS — Ground |
| 引脚 11 | VDD — Positive supply |
| 引脚 12 | RB0/INT — Digital I/O / external interrupt |
| 引脚 13 | RB1 — Digital I/O |
| 引脚 14 | RB2 — Digital I/O |
| 引脚 15 | RB3 — Digital I/O |
| 引脚 16 | RB4 — Digital I/O |
| 引脚 17 | RB5 — Digital I/O |
| 引脚 18 | RB6/PGC — Digital I/O / ICSP clock |
| 引脚 19 | RB7/PGD — Digital I/O / ICSP data |
| 引脚 20 | VSS — Ground |
| 引脚 21 | VDD — Positive supply |
| 引脚 22 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock |
| 引脚 23 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| 引脚 24 | RC2/CCP1 — Digital I/O / CCP1 |
| 引脚 25 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| 引脚 26 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| 引脚 27 | RC5/SDO — Digital I/O / SPI data out |
| 引脚 28 | RC6/TX/CK — Digital I/O / USART TX / clock |
| 引脚 29 | RC7/RX/DT — Digital I/O / USART RX / data |
| 引脚 30 | VSS — Ground |
| 引脚 31 | VDD — Positive supply |
| 引脚 32 | RD0 — Digital I/O |
| 引脚 33 | RD1 — Digital I/O |
| 引脚 34 | RD2 — Digital I/O |
| 引脚 35 | RD3 — Digital I/O |
| 引脚 36 | RD4 — Digital I/O |
| 引脚 37 | RD5 — Digital I/O |
| 引脚 38 | RD6 — Digital I/O |
| 引脚 39 | RD7 — Digital I/O |
| 引脚 40 | VSS — Ground |
| 引脚 41 | VDD — Positive supply |
| 引脚 42 | RE0/RD/AN5 — Digital I/O / parallel port read / analog input 5 |
| 引脚 43 | RE1/WR/AN6 — Digital I/O / parallel port write / analog input 6 |
| 引脚 44 | RE2/CS/AN7 — Digital I/O / parallel port chip select / analog input 7 |
典型应用
PIC16LC74A-04I/PT 适用于 6 应用s: Industrial Control Systems, Appliance Control Boards, Low-Speed Data Acquisition, Sensor Signal Conditioning and Interface, Automotive Subsystems (non-safety), Embedded Control Training and Prototyping.
Industrial Control Systems
The PIC16LC74A-04I/PT's 33 I/O pins and integrated peripherals make it well suited for industrial control panels driving relays, solenoid drivers, and discrete indicator LEDs. Its 4 MHz CPU clock executes instructions deterministically at 1 MIPS, sufficient for PID loops, sequencing logic, and sensor multiplexing in PLC-style designs. The industrial temperature grade (-40C to +85C) supports factory-floor environments with temperature swings.
推荐
Appliance Control Boards
The PIC16LC74A-04I/PT is commonly deployed in white-goods appliance controllers (washing machines, dishwashers, microwave ovens) where its 7 KB OTP memory holds locked firmware and the USART/SSP peripherals interface to display modules and sensor arrays. The wide operating voltage range and low current typical draw at CMOS clocks support energy-conscious appliances meeting Energy Star targets.
推荐
Low-Speed Data Acquisition
The PIC16LC74A-04I/PT's integrated 8-bit A/D converter with multiple input channels and USART/SCI peripheral makes it a cost-effective front end for low-speed data acquisition systems sampling temperature, pressure, or voltage at sub-kHz firmware-controlled intervals. 192 bytes of RAM buffers small sample windows before forwarding via serial, while the deterministic PIC core ensures fixed ADC acquisition timing.
推荐
Sensor Signal Conditioning and Interface
The PIC16LC74A-04I/PT's SSP (SPI/I2C) peripheral enables it to act as a sensor hub reading digital sensors and forwarding processed data to a host MCU. With 33 I/O ports, it can simultaneously scan multiple sensor channels and drive character LCDs or 7-segment displays. Its CMOS process ensures low current draw for battery-backed sensor interfaces in remote monitoring stations.
推荐
Automotive Subsystems (non-safety)
While not AEC-Q100 qualified, the PIC16LC74A-04I/PT is used in legacy automotive subsystems (interior lighting, mirror controllers, accessory timers) where its 44-TQFP industrial temperature grade and mature toolchain enable cost-sensitive designs. Designers transitioning to modern automotive should use AEC-Q100-qualified PIC16F or dsPIC equivalents from Microchip's automotive portfolio.
推荐
Embedded Control Training and Prototyping
The PIC16LC74A-04I/PT's mature MPLAB toolchain, MPASM assembler, and abundant third-party example code make it a popular choice for university courses and embedded systems training where students learn timer interrupts, A/D conversion, and serial communication. Its 44-TQFP package exposes enough I/O for breadboard-friendly breakout boards and peripheral experimentation.
推荐
推荐产品汇总
工程参考数据： PIC16LC74A-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 | PIC16F74-I/PT | PIC16LC74A-4I/PQ | PIC16LC74A-04/PT | PIC16F874-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same die, MQFP body | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Program Memory | 7 KB OTP | 7 KB Flash | 7 KB OTP (same) | 7 KB OTP (same) | 7 KB Flash |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 368 bytes |
| Max Clock Frequency | 4 MHz | 20 MHz | 4 MHz | 4 MHz | 20 MHz |
| A/D Converter | 8-bit | 8-bit | 8-bit | 8-bit | 10-bit |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Industrial (-40C to +85C) |
| Memory Type | OTP (one-time) | Flash (reprogrammable) | OTP (one-time) | OTP (one-time) | Flash (reprogrammable) |
关键差异点
- OTP memory for locked production firmware （对比 PIC16F74-I/PT)
- Low-voltage CMOS 'LC' process （对比 PIC16C74A-04I/PT)
- 44-TQFP package exposes 33 I/O pins with full peripheral set （对比 PIC16F874-I/PT)
设计说明
OTP memory cannot be re-programmed in-circuit. A single bad write bricks the part. For development, use the Flash-based PIC16F74-I/PT in the same 44-TQFP package, then swap to PIC16LC74A-04I/PT only after firmware is fully validated and frozen. Always verify code in Flash hardware before ordering masked/OTP equivalents.
Place decoupling capacitors (100 nF ceramic + 10 uF bulk) as close as possible to each VDD/VSS pair (pins 11/10, 21/20, 31/30, 41/40). The PIC16LC74A-04I/PT has four VDD/VSS pairs; failing to decouple all four can inject digital switching noise into the A/D converter via shared internal power traces. A single 100 nF at pin 11 is not sufficient.
Keep the OSC1/OSC2 crystal traces short and surrounded by a ground guard ring to reduce EMI susceptibility. For 4 MHz operation, a parallel-resonant crystal with 22-33 pF load capacitors to ground is standard. Place the MCLR pull-up resistor (typically 10 kohm) close to pin 1 to ensure clean reset behavior during power-up.
The 44-TQFP (10x10 mm) package has 0.8 mm pitch and is surface-mount. Hand-soldering is difficult; plan for reflow or hot-air rework. Exposed pad variants are absent on this package, so no thermal pad landing is required - VDD/VSS pins provide thermal dissipation paths. Follow IPC-7351 land pattern recommendations for optimal yield.
The 'I' suffix denotes industrial temperature grade (-40C to +85C); the non-'I' PIC16LC74A-04/PT is commercial grade (0C to +70C). Substituting an 'I' part on a design intended for commercial environments is fine, but using the commercial part in an industrial design will fail temperature testing. Verify the exact suffix when ordering to avoid thermal-range surprises.
合规信息
Compliance information not present in the verified web data; set to 'unknown' rather than guess. Per Microchip's general policy, parts in TQFP packages are typically lead-free but this specific part number's compliance status was not in the data; refer to manufacturer's product page or compliance certificate to confirm.