PIC16LC74AT-04I/PQ - 8-Bit 4MHz MCU, 7KB OTP, 44-MQFP | Microchip
部品番号: PIC16LC74AT-04I/PQ ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.05 | $80.50 |
| 100 | $7.2 | $720.00 |
| 500 | $6.5 | $3,250.00 |
| 1,000 | $5.95 | $5,950.00 |
PIC16LC74AT-04I/PQ 概要
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, I/O peripherals, and often analog interfaces. The PIC16C family is Microchip's mid-range 8-bit architecture using a Harvard RISC core with a 14-bit instruction word, well-suited to deterministic real-time control in industrial, automotive, and consumer applications. The PIC16LC74A series specifically targets low-voltage (2.5V-6V) operation with integrated ADC, making it a compact system-on-chip for cost-sensitive embedded designs.
Key features include 4MHz clock speed, an integrated 8-bit ADC with five input channels, three serial communication interfaces (I2C, SPI, USART), and 33 digital I/O pins. Brown-out Reset (BOR) and Power-On Reset (POR) protect code execution during supply transients. The wide 2.5V to 6V supply range simplifies integration into 3.3V and 5V systems. The 'LC' suffix denotes the low-power CMOS process, and the 'I' grade indicates industrial temperature range (-40C to +85C).
The device uses an OTP EPROM program memory architecture, programmed once via Microchip's ICSP interface. The 192-byte RAM is sufficient for small data buffers and stack operations in control loops. The mid-range 14-bit instruction set provides 35 single-word instructions and a 2-level hardware stack. With 33 I/O pins, this MCU can drive keypads, LCDs, and sensor interfaces directly.
Typical applications include industrial automation controllers, consumer electronics, automotive body electronics, HVAC control systems, and low-cost sensor interface boards. The combination of integrated ADC, multiple serial interfaces, and OTP memory makes it well suited to fixed-function appliances and instrumentation.
When designing with this MCU, note that OTP memory cannot be erased - use the windowed CERDIP version for development and OTP for production. A 20 MHz oscillator can be used with the internal PLL not present on this part - clock input drives the instruction cycle directly at Fosc/4. Ensure decoupling capacitors are placed close to VDD/VSS pins.
This page synthesizes distributor availability, parametric drop-in alternatives, and practical design notes not aggregated on any single manufacturer page.
ドロップイン代替品: PIC16LC74AT-04I/PQ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: PIC16LC74AT-04I/PQ （同一形状・フットプリント） — 相違点: Package, ADC, Communication Interfaces, Program Memory Type, Operating Temperature Range.
クイック比較ツール — 並列比較する代替部品を選択:
PIC16LC74A-04/PQ
✅ ドロップイン✓ 在庫あり
$2.43 / 個
データシートを見る →PIC16LC74AT-04/PQ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PIC16LC65BT-04I/PQ
✅ ドロップイン✓ 在庫あり
$5.45 / 個
データシートを見る →PIC16LC65B-04/PQ
✅ ドロップイン✓ 在庫あり
$2.5 / 個
データシートを見る →PIC16LC65AT-04I/PT
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$7.8 / 個
データシートを見る →PIC16LC65A-04I/PQ
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$5.3 / 個
データシートを見る →PIC16LC64AT-04I/L
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$7.5 / 個
データシートを見る →PIC16LC74AT-04I/PQ 最大定格＆電気的特性
| Core Architecture | PIC16C (8-bit Harvard RISC) |
| Instruction Set Width | 14-bit |
| 最大クロック周波数 | 4 MHz |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 bytes |
| EEPROM Data Memory | None |
| ADC | 5 channels x 8-bit |
| Supply Voltage Range | 2.5 V to 6 V |
| I/O Pins | 33 |
| Communication Interfaces | I2C, SPI, UART/USART |
| 動作温度範囲 | -40 C to +85 C (Industrial) |
| パッケージ | 44-pin MQFP (10x10 mm) |
| 実装タイプ | Surface Mount |
| Process Technology | CMOS (low-power) |
| RoHS ステータス | unknown |
PIC16LC74AT-04I/PQ ピン構成
| ピン 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| ピン 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| ピン 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| ピン 4 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| ピン 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input channel 3 / Voltage reference |
| ピン 6 | RA4/T0CKI — PORTA bit 4 / Timer 0 clock input |
| ピン 7 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SPI Slave Select |
| ピン 8 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input channel 5 |
| ピン 9 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input channel 6 |
| ピン 10 | RE2/CS/AN7 — PORTE bit 2 / Chip Select / Analog input channel 7 |
| ピン 11 | VDD — Positive supply voltage |
| ピン 12 | VSS — Ground reference |
| ピン 13 | OSC1/CLKIN — Oscillator input / External clock input |
| ピン 14 | OSC2/CLKOUT — Oscillator output / Clock output |
| ピン 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer 1 oscillator output / Timer 1 clock input |
| ピン 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer 1 oscillator input / CCP2 |
| ピン 17 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM/Capture/Compare) |
| ピン 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| ピン 19 | RD0 — PORTD bit 0 |
| ピン 20 | RD1 — PORTD bit 1 |
| ピン 21 | RD2 — PORTD bit 2 |
| ピン 22 | RD3 — PORTD bit 3 |
| ピン 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| ピン 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| ピン 25 | RC6/TX/CK — PORTC bit 6 / UART transmit / USART clock |
| ピン 26 | RC7/RX/DT — PORTC bit 7 / UART receive / USART data |
| ピン 27 | RD4 — PORTD bit 4 |
| ピン 28 | RD5 — PORTD bit 5 |
| ピン 29 | RD6 — PORTD bit 6 |
| ピン 30 | RD7 — PORTD bit 7 |
| ピン 31 | VSS — Ground reference |
| ピン 32 | VDD — Positive supply voltage |
| ピン 33 | RB0/INT — PORTB bit 0 / External interrupt |
| ピン 34 | RB1 — PORTB bit 1 |
| ピン 35 | RB2 — PORTB bit 2 |
| ピン 36 | RB3 — PORTB bit 3 |
| ピン 37 | RB4 — PORTB bit 4 |
| ピン 38 | RB5 — PORTB bit 5 |
| ピン 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| ピン 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| ピン 41 | VSS — Ground reference |
| ピン 42 | VDD — Positive supply voltage |
| ピン 43 | NC — Not connected (per datasheet) |
| ピン 44 | NC — Not connected (per datasheet) |
主な用途
PIC16LC74AT-04I/PQ の用途: 7 件s: Industrial Automation Controllers, Consumer Electronics Appliances, HVAC Control Systems, Automotive Body Electronics, Low-Cost Sensor Interface Boards, Instrumentation and Data Loggers, Security and Access Control Panels.
Industrial Automation Controllers
The PIC16LC74AT-04I/PQ fits industrial automation controllers with its 5-channel 8-bit ADC for sensor conditioning (temperature, pressure, flow), 33 I/O pins for relay and actuator driving, and I2C/SPI/UART for inter-MCU and HMI communication. The 2.5V-6V supply simplifies 24V-bus-derived 5V rail integration. The -40C to +85C industrial temperature grade supports factory floor operation. Integrated Brown-out Reset protects firmware during industrial supply transients. Pin-compatible PIC16F74A replacement is recommended for new designs needing Flash reprogrammability.
おすすめ
Consumer Electronics Appliances
The PIC16LC74AT-04I/PQ serves consumer appliances such as washing machines, microwave ovens, and coffee makers where fixed-function control with no firmware update is acceptable. The 7KB OTP memory holds the control algorithm permanently, reducing field-support costs. The integrated ADC reads temperature and level sensors, the PWM outputs drive motor controllers, and the UART enables diagnostics during factory test. The 4 MHz instruction rate is sufficient for keypad debouncing, display multiplexing, and basic state-machine control loops typical in appliance electronics.
おすすめ
HVAC Control Systems
The PIC16LC74AT-04I/PQ fits HVAC control boards needing analog sensor reading and serial communications. The 8-bit ADC handles thermistor and pressure-sensor inputs across five channels, while the SPI bus drives a graphic LCD display and the I2C bus communicates with the indoor unit's thermistor network. The 192-byte RAM is sufficient for HVAC state machine and temperature-history buffers. Brown-out Reset ensures clean restart after compressor-induced voltage dips. The 44-MQFP package allows compact PCB layout fitting within thermostat enclosures.
おすすめ
Automotive Body Electronics
The PIC16LC74AT-04I/PQ operates in automotive body controllers for seat adjustment, mirror control, and lighting modules. The industrial temperature grade accommodates under-dash and door-module environments. Three serial interfaces enable Body Control Module (BCM) communication, while the 5-channel ADC reads switch positions and ambient light. The wide 2.5V-6V supply tolerates 12V battery transients after regulator decoupling. However, for AEC-Q100 qualified designs, the automotive-grade PIC16F74A-I/PQ is preferred over this industrial-rated variant.
おすすめ
Low-Cost Sensor Interface Boards
The PIC16LC74AT-04I/PQ is well-suited to sensor-interface PCBs that aggregate analog inputs and forward them over a serial bus. The 5-channel 8-bit ADC multiplexes thermistor, photodiode, and potentiometer signals; the UART outputs a Modbus or custom protocol frame to a host controller. The 33 I/O pins drive status LEDs and select lines. The 2.5V minimum supply allows battery-powered operation with a single lithium cell. OTP memory locks the calibration coefficients permanently, preventing end-user modification.
おすすめ
Instrumentation and Data Loggers
The PIC16LC74AT-04I/PQ fits portable data loggers recording temperature, humidity, and voltage over time. The integrated ADC samples environmental sensors, while the UART streams records to a host PC or stores them in an external EEPROM via I2C. The 192-byte RAM serves as a circular buffer between samples. Low-voltage operation down to 2.5V lets the design run from two AA cells. Brown-out Reset protects the log pointer during battery end-of-life. The OTP memory locks the logging algorithm, deterring firmware tampering in field-deployed units.
おすすめ
Security and Access Control Panels
The PIC16LC74AT-04I/PQ serves access-control keypad panels reading PIN codes and driving relay outputs for door strikes. The 33 I/O pins scan a 4x4 matrix keypad, drive status LEDs, and control the electric-latch relay. The I2C interface reads a real-time clock for time-stamping entry events, while the UART links to a central access controller. Brown-out Reset and Watchdog Timer prevent lockout in fault conditions. OTP memory locks the PIN-validation algorithm and prevents unauthorized firmware reverse-engineering, a security advantage over Flash parts.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: PIC16LC74AT-04I/PQ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | PIC16LC74A-04/PQ | PIC16LC74AT-04/PQ | PIC16LC65BT-04I/PQ | PIC16LC65B-04/PQ | PIC16LC65A-04I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10) | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 4 KB OTP (-43%) | 4 KB OTP (-43%) | 4 KB OTP (-43%) |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.5 V to 6 V | 2.5 V to 6 V | 2.5 V to 6 V | 2.5 V to 6 V | 2.5 V to 6 V | 2.5 V to 6 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | 0 C to +70 C (Commercial) | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
主な差別化要因
- Highest OTP program memory in the 44-MQFP PIC16C7X family （vs PIC16LC65BT-04I/PQ)
- Industrial temperature grade included （vs PIC16LC74AT-04/PQ)
- Integrated 5-channel 8-bit ADC absent in PIC16C64/65 family （vs PIC16LC65A-04I/PQ)
設計ノート
Estimated: the PIC16LC74AT-04I/PQ typical active current at 4 MHz and 5 V is approximately 2-5 mA depending on peripheral activity, dropping to microampere levels in sleep mode. Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair (pins 11/12, 31/32, 41/42), and add a bulk 10 uF tantalum or ceramic capacitor near the MCU power pin. The wide 2.5V-6V supply range simplifies integration with both 3.3V and 5V rails, but the BOR (Brown-out Reset) trip voltage must be configured per application note TB087.
Keep the 44-MQFP (10x10 mm) package on a clearly-routed section of the PCB with the 0.8 mm pitch gull-wing leads aligned with the land pattern. Use reflow profiles within the JEDEC J-STD-020 MSL-3 window for plastic MQFP packages; the device is moisture-sensitive and requires dry-pack handling and pre-bake if floor-life has expired. Place the 4 MHz crystal or resonator within 5 mm of OSC1/OSC2 pins 13 and 14, with a grounded guard ring around the oscillator traces to reduce EMI coupling into adjacent analog channels.
Critical pitfall: the OTP EPROM can be programmed only once - there is no in-circuit reprogramming path. Any firmware revision requires a new wafer programming, so production firmware must be fully validated on a windowed CERDIP prototype (e.g., PIC16C74A-04/P) before committing to the OTP package. Also note that I2C and SPI share the SSP module on PORTC pins RC3/RC4, so both interfaces cannot operate simultaneously on independent buses - this limits multi-bus designs. The Watchdog Timer must be enabled in configuration bits if used; otherwise it is disabled at reset.
Estimated: at 4 MHz system clock the instruction cycle is 1 microsecond, well below the bandwidth where signal integrity dominates the 44-MQFP layout. However, the analog inputs AN0-AN7 are multiplexed onto a single ADC and benefit from short traces to minimize crosstalk. Route the AVdd/VREF reference separately from digital VDD and place a ferrite bead or 10 ohm resistor between them; decouple VREF with 100 nF + 10 uF close to pin 5. For ADC accuracy better than +/-1 LSB, average multiple samples and use the acquisition-delay minimums from section 11 of the datasheet.
コンプライアンス情報
RoHS, REACH, lead-free and halogen-free status not present in the Verified Web Data for this obsolete part. Part is industrial temperature grade but not AEC-Q100 qualified - choose automotive-grade PIC16F74A-I/PQ for AEC-Q100 applications.
