PIC16C74A-20I/L - 8-Bit 20MHz OTP MCU 7KB | Microchip
부품 번호: PIC16C74A-20I/L ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $13.61 | $13.61 |
| 10 | $12.25 | $122.50 |
| 100 | $10.95 | $1,095.00 |
| 500 | $9.8 | $4,900.00 |
| 1,000 | $8.75 | $8,750.00 |
PIC16C74A-20I/L 개요
An 8-bit microcontroller (MCU) is a single-chip microcomputer containing a CPU, memory, and peripherals on one die, executing instructions on 8-bit data words. Within the broader taxonomy, the PIC16C74A belongs to the mid-range 8-bit MCU category, itself part of the microcontroller family of embedded processors within the semiconductor hierarchy. OTP memory permits one-time programming during production but cannot be erased afterwards; for erasable variants, Microchip recommends the PIC16F74 Flash-based equivalent.
Key features of the PIC16C74A-20I/L include high sink/source current of 25/25 mA per I/O, low-power consumption (5 µA typical standby at 3V/32 kHz, 15 µA at 5V/4 MHz), a high-performance RISC architecture with only 35 single-word instructions to learn, and all instructions execute in a single cycle except program branches (two cycles). The integrated peripherals include a synchronous serial port (SSP) for SPI/I2C, a USART for asynchronous serial communication, and a parallel slave port for external bus interfaces.
The device is built on a fully-static CMOS process, allowing clock frequencies from DC up to 20 MHz without internal oscillator overhead. The 8-bit A/D converter with 8 input channels enables direct interfacing with analog sensors, while the 192-byte RAM supports small data buffers for real-time control loops. OTP program memory provides cost-effective one-time programming suitable for mature production designs.
Typical applications include industrial control systems, automotive body electronics, appliance controllers, sensor signal conditioning nodes, and embedded data acquisition modules. The 33 I/O pins and integrated ADC make it particularly suitable for multi-channel sensor monitoring applications. When designing with the PIC16C74A-20I/L, verify MCLR reset circuitry and use a 1 µF decoupling capacitor on VDD within 1 cm of the device; the OTP memory cannot be field-updated, so development should use the Flash-based PIC16F74 equivalent before committing to OTP production parts.
This page synthesizes distributor stock and pricing snapshots (as of 2026-09-18), drop-in compatible alternatives in the same 44-PLCC footprint, and practical design notes not found in the original 1997-vintage manufacturer datasheet.
드롭인 대체품: PIC16C74A-20I/L — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: PIC16C74A-20I/L (동일 폼 팩터 및 풋프린트) — 차이점: Package, Core Architecture, Serial Interfaces, Operating Temperature Range, Mounting Type.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
PIC16F74-I/L
✅ 드롭인✓ 재고 있음
$8.6904 / 개
데이터시트 보기 →PIC16F74T-I/L
✅ 드롭인✓ 재고 있음
$2.9326 / 개
데이터시트 보기 →PIC16C74B-20I/L
✅ 드롭인✓ 재고 있음
$8.92 / 개
데이터시트 보기 →PIC16C74A-20/L
✅ 드롭인✓ 재고 있음
$7.1 / 개
데이터시트 보기 →PIC16C74A-20I/L 최대 정격 & 전기적 특성
| Core Architecture | 8-bit PIC RISC (mid-range) |
| Instruction Set | 35 single-word instructions |
| 최대 클록 주파수 | 20 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 192 bytes |
| Data EEPROM | Not present on this OTP variant |
| Supply Voltage Range | 2.5 V to 6.0 V |
| I/O Pins | 33 |
| A/D Converter | 8 channels x 8-bit |
| Timer/Counters | 3 (with CCP) |
| Serial Interfaces | SSP (SPI/I2C), USART |
| Parallel Slave Port | Yes (8-bit) |
| I/O Sink/Source Current | 25 mA / 25 mA |
| 동작 온도 범위 | -40 C to +85 C (Industrial, "I" grade) |
| 패키지 | 44-pin PLCC (J-Lead) |
| 실장 유형 | Surface Mount (PLCC socket compatible) |
PIC16C74A-20I/L 44-pin plcc (j-lead) 핀 구성 가이드
PIC16C74A-20I/L(44-pin plcc (j-lead) 패키지)의 핀 구성입니다. 이 디지털 IC에는 GPIO, 통신 인터페이스(UART, SPI, I2C), 전원 핀이 포함되어 있습니다. 대체 핀 기능과 구성 옵션은 제조사 데이터시트를 참조하십시오. 임베디드 시스템 설계와 PCB 레이아웃에 필수적입니다.
다음에 대한 상세 핀아웃 데이터 없음: PIC16C74A-20I/L.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
PIC16C74A-20I/L 적합 용도: 6 애플리케이션s: Industrial Sensor Monitoring, Appliance Control Board, Automotive Body Electronics, Embedded Data Acquisition Module, Security and Access Control, Hobbyist and Educational Embedded Platform.
Industrial Sensor Monitoring
The PIC16C74A-20I/L's 8-channel 8-bit A/D converter and 33 digital I/O pins make it well-suited for multi-channel industrial sensor monitoring. It can directly sample 8 analog inputs (thermistors, pressure transducers, photo-sensors) while driving indicator LEDs, relays, and operator panel switches through its 25 mA sink/source capable ports. Operating from 2.5 V to 6.0 V at industrial temperatures (-40°C to +85°C), the device handles factory-floor environments without additional conditioning. Its 35-instruction RISC core and 20 MHz clock allow tight control loops for process regulation. The 192-byte RAM is adequate for sensor smoothing buffers. OTP memory ensures firmware stability in field-deployed industrial systems that rarely require code updates.
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Appliance Control Board
The PIC16C74A-20I/L fits appliance control applications such as washing machines, dishwashers, and HVAC controls where a stable OTP part is preferred for cost reasons. The 33 I/O lines interface directly with mechanical push-buttons, rotary encoders, seven-segment displays, and triac-driven AC loads. Three timer/counters with CCP support precise PWM for motor speed control and proportional valve actuation. The USART enables diagnostics communication with service tools. Operating at 5 V from a simple linear regulator and tolerating up to 6 V, the MCU coexists with noisy relay-driven power stages. OTP memory locks production firmware, preventing field corruption by voltage transients common in white-goods environments.
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Automotive Body Electronics
The PIC16C74A-20I/L's industrial temperature rating (-40°C to +85°C) and OTP one-time-programmable memory are useful for automotive body electronics such as mirror controllers, seat position modules, and lighting timers. Its 8-channel ADC reads potentiometers and current-sense amplifiers, while 33 I/O drive MOSFET gates, lamps, and H-bridges. The 20 MHz RISC core executes body-controller state machines efficiently, and the SSP supports SPI peripherals such as CAN-transceiver companion chips. Although Microchip's newer PIC16F family is preferred for AEC-Q100 designs, the PIC16C74A remains in production for cost-sensitive legacy body modules where OTP stability and 25 mA I/O drive eliminate external transistors.
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Embedded Data Acquisition Module
The PIC16C74A-20I/L serves as the CPU in standalone data-acquisition front-ends that log multi-channel analog signals to external EEPROM or SD cards. Its 8-bit successive-approximation ADC samples 8 channels with selectable references, while the SSP SPI port streams data to a serial Flash or SD card. The USART provides an RS-232 service-port for data retrieval and configuration. With 192 bytes of RAM, the MCU buffers acquisition frames before storage, and three timer/counters schedule precise sampling intervals. Operating at 5 V from a regulated supply, the device delivers reliable acquisition in instrumentation, environmental monitoring, and laboratory automation where OTP memory locks validated firmware.
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Security and Access Control
The PIC16C74A-20I/L is a practical choice for keypad door controllers, RFID readers, and simple alarm panels where 33 I/O lines interface with matrix keypads, magnetic-stripe readers, relay-controlled locks, and sirens. Its 20 MHz RISC core runs the access-control state machine fast enough for real-time PIN validation, while the 192-byte RAM holds the current credential being processed. The SSP/I2C port talks to EEPROM credential storage, and the USART connects to a central monitoring panel. OTP memory prevents firmware tampering — important for security equipment where code-injection attacks must be impossible. Industrial temperature range permits outdoor mounting in secured enclosures.
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Hobbyist and Educational Embedded Platform
The PIC16C74A-20I/L is widely used in educational settings and hobbyist electronics projects, particularly with Microchip's MPLAB IDE and PICkit programmers. Its 35-instruction RISC architecture is the canonical teaching example for embedded programming courses, and the 7 KB OTP memory accommodates substantial student projects. The 44-PLCC package fits standard 44-pin PLCC sockets, simplifying breadboarding. With 33 I/O, 8-channel ADC, USART, SPI, I2C, three timers, and CCP PWM, students can implement UART communication, motor control, sensor acquisition, and interrupt-driven design all on one chip. The industrial temperature range allows robust student projects for outdoor demonstrations.
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추천 제품 요약
엔지니어링 참조 데이터: PIC16C74A-20I/L — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | PIC16F74-I/L | PIC16F74T-I/L | PIC16C74B-20I/L | PIC16C74A-20/L | PIC16C74A-20I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) | 44-MQFP (PQ) — different footprint |
| Program Memory Type | OTP 7 KB | Flash 4 KB | Flash 4 KB | OTP 7 KB | OTP 7 KB | OTP 7 KB |
| Program Memory Size | 7 KB (4K x 14) | 4 KB | 4 KB | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage | 2.5 V to 6.0 V | 2.0 V to 6.0 V | 2.0 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V |
| Temperature Range | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) |
| ADC | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit |
| Field Reprogrammable | No (OTP) | Yes (Flash) | Yes (Flash) | No (OTP) | No (OTP) | No (OTP) |
| Approx. Unit Price (USD, as of 2026-09-18) | 13.61 | Lower (Flash, higher volume) | Lower (Flash, tape & reel) | Similar to PIC16C74A | Similar (commercial grade) | Similar (MQFP variant) |
주요 차별점
- Officially endorsed Flash-based successor with field updates (vs PIC16F74-I/L)
- Industrial temperature range and mature OTP stability (vs PIC16C74A-20/L)
- Direct drop-in silicon revision within OTP family (vs PIC16C74B-20I/L)
설계 노트
Place a 0.1 µF ceramic decoupling capacitor within 1 cm of the VDD pin and a 10 µF bulk capacitor near the MCU power pins to suppress switching noise. The PIC16C74A-20I/L has separate AVdd/AVss pins for the ADC; the analog supply must be filtered with a ferrite bead or small inductor and a dedicated 10 µF + 0.1 µF RC network to prevent digital switching noise from coupling into the ADC readings. Brown-out detection at 4.0 V (BOREN enabled) is recommended for unreliable supply rails to avoid corruption of the OTP program memory.
OTP program memory can be programmed only once; any bug in firmware becomes permanent. Always develop and validate on a PIC16F74-I/L (Flash, same footprint) before committing to PIC16C74A-20I/L for production. Watch the MCLR pin: floating or weak pull-up can cause intermittent resets — use a 10 kΩ pull-up to Vdd and a 100 nF capacitor to ground for stable operation. The 8-bit ADC's reference voltage pins (Vref+/Vref-) must be sourced from low-impedance drivers (≤10 Ω) — using Vdd as reference without buffering introduces 1-2 LSB of ADC error.
The 44-PLCC package should be socketed (e.g., 44-pin PLCC thru-hole or SMT socket) for prototype development, allowing easy swap between PIC16C74A-20I/L (OTP) and PIC16F74-I/L (Flash) during firmware validation. Place the ICSP programming header (Vpp, Vdd, GND, RB6/PGC, RB7/PGD) on a 0.1-inch pitch 5-pin header on the board edge for factory programming access. Keep the 20 MHz crystal traces short and symmetric, with load capacitors (typically 15-33 pF) returned to GND within 5 mm of the OSC1/OSC2 pins to avoid parasitic oscillation modes.
규정 준수 정보
RoHS and lead-free status confirmed via Microchip product page and distributor listings. The ICE product is not AEC-Q100 qualified; Microchip's newer PIC16F family typically carries automotive grade for body-electronics applications. Conflict-minerals compliance per Microchip corporate policy.
