PIC16C74A-10I/L - 8-Bit 10MHz OTP MCU 7KB | 44-PLCC | Microchip
料号： PIC16C74A-10I/L ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.24 | $9.24 |
| 10 | $8.5 | $85.00 |
| 100 | $7.65 | $765.00 |
| 500 | $6.92 | $3,460.00 |
| 1,000 | $6.1 | $6,100.00 |
PIC16C74A-10I/L 概述
What is an 8-bit OTP microcontroller? An OTP MCU integrates a CPU core, program memory (one-time-programmable EPROM that can be written once), RAM, peripherals, and I/O into a single chip. Within the broader hierarchy, the PIC16C74A belongs to: microcontroller -> embedded MCU -> 8-bit MCU -> CMOS RISC MCU -> PIC16C7X mid-range family -> Microchip PIC16 family -> Microchip 8-bit portfolio -> semiconductor. The 8-bit RISC architecture with 35 single-word instructions enables compact, deterministic code execution ideal for real-time control.
Key features include 7KB (4K x 14) OTP program memory, 192 bytes of data RAM, 33 I/O pins with individual direction control, two CCP (Capture/Compare/PWM) modules, a watchdog timer with its own on-chip RC oscillator, power-on reset, brown-out detection, and an in-circuit serial programming (ICSP) interface. The 44-PLCC package provides a robust through-hole-mount form factor with a J-lead footprint.
The PIC16C74A uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access in a single cycle (except program branches). At 10 MHz the instruction cycle is 100 ns, and most instructions complete in one cycle, yielding up to 10 MIPS throughput for real-time control loops. The integrated 8-bit ADC provides 8 input channels with selectable reference voltage.
Typical applications include industrial automation controllers, motor control (stepper and DC brushed), automotive body electronics (note: not AEC-Q100 qualified), HVAC control boards, security and fire-alarm panels, and embedded sensor-interface nodes. The 33 I/O and integrated ADC suit applications that previously required external logic or multiple ICs.
Design consideration: The OTP memory means code cannot be erased; for prototyping, consider the PIC16F74 (Flash) or PIC16C74B-20I/L (UV-erasable CERDIP windowed). Brown-out detect must be enabled for reliable operation in noisy industrial environments; the watchdog timer should be enabled for safety-critical applications.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the bare manufacturer datasheet, providing a single engineering reference for the PIC16C74A-10I/L.
直接替换替代料： PIC16C74A-10I/L ——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： PIC16C74A-10I/L （相同外形与封装尺寸） ——差异在于 Package, Core Architecture, Timers, A/D Converter, Data EEPROM.
快速对比工具——选择替代料号进行并排对比：
PIC16C74A-10I/L
✅ 直接替换✓ 有现货
$6.1 / 个
查看数据手册 →PIC16C74A-10/L
✅ 直接替换✓ 有现货
$8.4 / 个
查看数据手册 →PIC16C74A-10E/L
✅ 直接替换✓ 有现货
$7.95 / 个
查看数据手册 →PIC16C74A-10/P
✅ 直接替换✓ 有现货
$4.65 / 个
查看数据手册 →PIC16C74A-04I/P
✅ 直接替换✓ 有现货
$7.5 / 个
查看数据手册 →PIC16C74A-04/PQ
✅ 直接替换✓ 有现货
$5.8 / 个
查看数据手册 →PIC16C74B-20I/L
✅ 直接替换✓ 有现货
$8.92 / 个
查看数据手册 →PIC16C74A-10I/L 最大额定值与电气特性
| Core Architecture | 8-bit PIC RISC, Harvard |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 192 bytes |
| Data EEPROM | None |
| 最大时钟频率 | 10 MHz |
| Instruction Cycle Time | 100 ns at 10 MHz |
| Throughput | 10 MIPS peak |
| Supply Voltage (VDD) | 4.0 V to 5.5 V |
| Number of I/O Pins | 33 |
| ADC | 8-bit, 8 channels |
| Timers | Timer0 (8-bit), Timer1 (16-bit), Timer2 (8-bit) |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Serial Interfaces | USART (async/sync), SSP (SPI/I2C) |
| 工作温度范围 | -40C to +85C (industrial, /L suffix windowed ceramic) |
| 封装 | 44-pin PLCC (J-Lead, 16.59 x 16.59 mm) |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
| Brown-out Reset | Yes |
| In-Circuit Programming | ICSP supported |
PIC16C74A-10I/L 引脚配置
| 引脚 1 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| 引脚 2 | OSC2/CLKOUT — Crystal oscillator output / clock output (Fosc/4) |
| 引脚 3 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| 引脚 4 | RA0/AN0 — Port A bit 0 / analog input 0 |
| 引脚 5 | RA1/AN1 — Port A bit 1 / analog input 1 |
| 引脚 6 | RA2/AN2 — Port A bit 2 / analog input 2 |
| 引脚 7 | RA3/AN3/VREF — Port A bit 3 / analog input 3 / ADC reference |
| 引脚 8 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| 引脚 9 | RA5/AN4/SS — Port A bit 5 / analog input 4 / SPI slave select |
| 引脚 10 | VSS — Ground |
| 引脚 11 | VDD — Positive supply (4.0-5.5V) |
| 引脚 12 | RB0/INT — Port B bit 0 / external interrupt |
| 引脚 13 | RB1 — Port B bit 1 |
| 引脚 14 | RB2 — Port B bit 2 |
| 引脚 15 | RB3 — Port B bit 3 |
| 引脚 16 | RB4 — Port B bit 4 |
| 引脚 17 | RB5 — Port B bit 5 |
| 引脚 18 | RB6/PGC — Port B bit 6 / ICSP clock |
| 引脚 19 | RB7/PGD — Port B bit 7 / ICSP data |
| 引脚 20 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / clock input |
| 引脚 21 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 |
| 引脚 22 | RC2/CCP1 — Port C bit 2 / CCP1 |
| 引脚 23 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| 引脚 24 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| 引脚 25 | RC5/SDO — Port C bit 5 / SPI data out |
| 引脚 26 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| 引脚 27 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| 引脚 28 | RD0/PSP0 — Port D bit 0 / parallel slave port bit 0 |
| 引脚 29 | RD1/PSP1 — Port D bit 1 / PSP bit 1 |
| 引脚 30 | RD2/PSP2 — Port D bit 2 / PSP bit 2 |
| 引脚 31 | RD3/PSP3 — Port D bit 3 / PSP bit 3 |
| 引脚 32 | RD4/PSP4 — Port D bit 4 / PSP bit 4 |
| 引脚 33 | RD5/PSP5 — Port D bit 5 / PSP bit 5 |
| 引脚 34 | RD6/PSP6 — Port D bit 6 / PSP bit 6 |
| 引脚 35 | RD7/PSP7 — Port D bit 7 / PSP bit 7 |
| 引脚 36 | RE0/RD — Port E bit 0 / parallel slave port read control |
| 引脚 37 | RE1/WR — Port E bit 1 / parallel slave port write control |
| 引脚 38 | RE2/CS — Port E bit 2 / parallel slave port chip select |
| 引脚 39 | AVSS — Analog ground |
| 引脚 40 | AVDD — Analog positive supply |
| 引脚 41 | AN5 — Analog input 5 |
| 引脚 42 | AN6 — Analog input 6 |
| 引脚 43 | AN7 — Analog input 7 |
| 引脚 44 | NC — Not connected (per datasheet) |
典型应用
PIC16C74A-10I/L 适用于 6 应用s: Industrial Automation Controllers, Motor Control - DC Brushed and Stepper, HVAC and Building Automation Control Boards, Security and Fire Alarm Panels, Automotive Body Electronics (Non-Safety), Embedded Sensor Interface / Data Acquisition Nodes.
Industrial Automation Controllers
The PIC16C74A-10I/L's 33 I/O pins, 8-channel 8-bit ADC, and 10 MIPS throughput make it well suited to industrial PLC-style controllers handling sensor inputs and actuator outputs. The integrated ADC captures analog process variables (temperature via thermistor, pressure, flow) while two CCP modules generate PWM outputs for proportional valves or motor speed control. Its 4-5.5V operation aligns with the standard 5V industrial backplane, and brown-out reset plus watchdog timer protect against supply glitches in factory-floor environments. PIC16C7X architecture is widely documented, reducing engineering training overhead.
推荐
Motor Control - DC Brushed and Stepper
The PIC16C74A-10I/L's two CCP modules can drive two brushed DC motors or one bipolar stepper in full-step or microstepping mode via external H-bridge drivers. The 10 MIPS throughput supports closed-loop PID at sample rates up to 100 kHz when paired with hardware timers, and the 8-channel ADC reads back current-sense amplifiers for torque control. Industrial-grade -40C to +85C operation suits motor enclosures. Note: the OTP memory requires full in-system programming per board, so production programming fixtures must be designed.
推荐
HVAC and Building Automation Control Boards
The PIC16C74A-10I/L is widely deployed in HVAC control boards driving 24VAC contactors via triac interfaces and reading thermistor temperature sensors via its 8-channel ADC. The 33 I/O support multiple zone damper control, fan-speed relay outputs, and a keypad/display interface. USART enables connection to building automation modems or RS-485 transceivers for BACnet/Modbus gateway functionality. Its industrial temperature range tolerates attic and equipment-room conditions.
推荐
Security and Fire Alarm Panels
The PIC16C74A-10I/L's integrated ADC, USART, and 33 I/O accommodate multi-zone intrusion or fire-alarm panels that monitor loops of smoke detectors, PIR sensors, and magnetic contacts. The hardware watchdog timer (with its own on-chip RC) ensures the system resets on firmware lockup, a critical safety requirement. Brown-out reset maintains state during brownouts. The 192-byte RAM and 7KB OTP accommodate small zone-count firmware with keypad menus and dialer/cellular modem interface via USART.
推荐
Automotive Body Electronics (Non-Safety)
The PIC16C74A-10I/L appears in non-safety automotive body electronics such as interior lighting controllers, seat-position memory modules, and aftermarket gauge clusters. Its 5V operation interfaces directly to automotive 12V via 7805 regulators. Note: this part is NOT AEC-Q100 qualified and Microchip recommends PIC16F74 or PIC18 equivalents for new automotive designs. The 33 I/O and PWM outputs suit multi-channel LED dimming and gauge stepper driving.
推荐
Embedded Sensor Interface / Data Acquisition Nodes
The PIC16C74A-10I/L's 8-channel 8-bit ADC and SSP (SPI/I2C) make it suitable as a low-cost sensor hub that aggregates thermocouple, RTD, or strain-gauge signals and reports them over USART to a host controller. At 10 MIPS it can perform basic linearization and filtering in firmware. The 33 I/O and modest RAM let it service 8 analog inputs plus digital status I/O simultaneously. Industrial -40 to +85C operation allows outdoor or cabinet-mounted sensor nodes.
推荐
推荐产品汇总
工程参考数据： PIC16C74A-10I/L ——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 | PIC16C74A-10/L | PIC16C74A-10E/L | PIC16C74B-20I/L | PIC16C74A-04I/P |
|---|---|---|---|---|---|
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Clock Frequency | 10 MHz | 10 MHz | 10 MHz | 20 MHz | 4 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB UV EPROM | 7 KB OTP |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Temperature Range | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +125C (extended) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Memory Type | OTP EPROM (one-time) | OTP EPROM | OTP EPROM | UV-erasable CERDIP windowed | OTP EPROM |
| ADC Channels / Bits | 8 / 8-bit | 8 / 8-bit | 8 / 8-bit | 8 / 8-bit | 8 / 8-bit |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| AEC-Q100 Qualified | No | No | No | No | No |
关键差异点
- Same-family industrial drop-in availability （对比 PIC16C74A-10/L)
- 2x clock headroom on B variant （对比 PIC16C74B-20I/L)
- Higher temperature ceiling on /E variant （对比 PIC16C74A-10E/L)
设计说明
The PIC16C74A-10I/L requires a stable 4.0V to 5.5V supply with brown-out detection enabled. Place a 100 nF ceramic decoupling capacitor within 5 mm of the VDD/AVDD pins and a 10 uF bulk tantalum or aluminum polymer capacitor at the regulator output. For analog accuracy, separate analog VDD (AVDD) and analog VSS (AVSS) supplies are provided; route AVSS to a quiet ground star-point and add a ferrite bead between VDD and AVDD to reduce digital switching noise on the ADC reference.
OTP memory can be programmed only once per chip; there is no in-system field update path. Plan production programming fixtures (gang programmers, ICSP fixtures, or third-party programming houses) accordingly. Brown-out reset must be configured via the configuration bits (BODEN) and a valid BOR voltage threshold (BORV) - failure to enable brown-out reset can cause undefined execution during supply droop, especially in industrial environments with large inductive loads on the same 24V bus.
The 44-PLCC J-lead package requires a PLCC socket for development (e.g., 44-pin DIP-to-PLCC adapter) and a careful PCB land pattern: 1.27 mm (50 mil) pitch J-leads with a center pad for mechanical stability. Keep analog traces (RA0-RA5, AN5-AN7) away from switching signals like OSC1/OSC2 and CCP1/CCP2 PWM outputs; route analog ground AVSS as a separate island joining VSS only at the regulator. The MCLR pin requires a 10 kohm pull-up to VDD and a 100 nF cap to ground for reset integrity.
When driving the ADC from high-impedance sensors, add a 100 pF to 1 nF ceramic capacitor on each analog input to filter RF and to provide the ADC sample-and-hold charge reservoir. Acquisition time for the 8-bit ADC at 10 MHz is short, but source impedance above 5 kohm degrades accuracy. Use the VREF+ pin (shared with RA3) tied to a stable external reference (e.g., MCP1541) when absolute accuracy matters more than ratiometric measurements against VDD.
合规信息
The /L windowed ceramic PLCC package is generally non-RoHS due to lead-bearing terminations and ceramic body. Microchip recommends PIC16F74 (Flash, RoHS, plastic PLCC) for new designs. Part is not AEC-Q100 qualified - for automotive use, consider PIC16F74T-I/PT or PIC18F equivalent.
