PIC16C74A-20/L - 8-Bit 20MHz OTP MCU 7KB | Microchip | PLCC-44
部品番号: PIC16C74A-20/L ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $11.2 | $11.20 |
| 10 | $9.95 | $99.50 |
| 100 | $8.75 | $875.00 |
| 500 | $7.8 | $3,900.00 |
| 1,000 | $7.1 | $7,100.00 |
PIC16C74A-20/L 概要
A PIC microcontroller is a compact programmable processor based on a Harvard RISC architecture that separates program and data memory for deterministic, single-cycle instruction execution. PIC16C-series MCUs sit in the hierarchy: microcontroller -> 8-bit MCU -> embedded controller -> semiconductor. They are widely used in cost-sensitive embedded designs where deterministic timing, low power consumption, and easy programmability outweigh the need for large memory or modern peripherals.
Key features include 35 single-word instructions (all single-cycle except two-cycle program branches), high sink/source current capability of 25 mA/25 mA per pin suitable for direct LED or relay drive, integrated analog peripherals, and three hardware timer/counter modules. The PIC16C74A-20/L also provides a USART, MSSP (SPI/I2C) port, 8-channel 8-bit ADC, capture/compare/PWM modules, and a programmable brown-out reset.
The PIC16C74A architecture uses an 8-level deep hardware stack and separate instruction/data buses. The OTP program memory is one-time programmable - once written it cannot be erased, distinguishing it from UV-erasable CERDIP variants in the family. Power consumption is exceptionally low: 15 uA typical at 5 V / 4 MHz and 1 uA typical standby at 3 V / 32 kHz.
Typical applications include industrial control logic, appliance controllers, automotive subsystems, sensor signal conditioning front-ends, and low-cost embedded products. The wide operating voltage range (2.5 V-6.0 V per family datasheet) and broad temperature grades make it suitable for both commercial and extended-environment designs.
When designing with this part, note that OTP memory cannot be re-programmed - use the CERDIP/JW windowed variant for prototype development. The A newer Flash-based PIC16F74 is pin-compatible and recommended for new designs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
ドロップイン代替品: PIC16C74A-20/L — 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: PIC16C74A-20/L （同一形状・フットプリント） — 相違点: Mounting Type, Data EEPROM, Package, Core Architecture, Program Memory Size.
クイック比較ツール — 並列比較する代替部品を選択:
PIC16F74-I/L
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PIC16C74B-20/L
✅ ドロップイン✓ 在庫あり
$8.2 / 個
データシートを見る →PIC16C74A-20I/L
✅ ドロップイン✓ 在庫あり
$8.75 / 個
データシートを見る →PIC16C74A-10/L
✅ ドロップイン✓ 在庫あり
$8.4 / 個
データシートを見る →PIC16C74A-04I/P
✅ ドロップイン✓ 在庫あり
$7.5 / 個
データシートを見る →PIC16C74A-20/L 最大定格＆電気的特性
| Core Architecture | 8-bit PIC16C RISC (Harvard) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 bytes |
| Data EEPROM | None (external emulation not supported) |
| 最大クロック周波数 | 20 MHz |
| Instruction Cycle Time | 200 ns (4 clock cycles per instruction) |
| 電源電圧 | 4.0 V to 5.5 V |
| 動作温度範囲 | 0C to +70C (Commercial, per /L suffix) |
| I/O Pins | 33 |
| パッケージ | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm |
| 実装タイプ | Surface Mount |
| Timers | 3 (Timer0, Timer1, Timer2) |
| ADC | 8-channel, 8-bit |
| Communication Peripherals | USART (SCI), MSSP (SPI / I2C) |
| PWM Modules | 2 (CCP1, CCP2) |
| I/O Sink/Source Current | 25 mA / 25 mA per pin |
| Active Current (5 V / 4 MHz) | 15 uA typical |
| Standby Current (3 V / 32 kHz) | 1 uA typical |
| Instruction Set Size | 35 single-word instructions |
| Hardware Stack Depth | 8 levels |
| Watchdog Timer | Yes |
| Brown-out Reset | Programmable |
PIC16C74A-20/L ピン構成
| ピン 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage input |
| 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 / ADC voltage reference |
| ピン 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| ピン 7 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SPI Slave Select |
| ピン 8 | OSC1/CLKIN — Oscillator crystal input / External clock input |
| ピン 9 | OSC2/CLKOUT — Oscillator crystal output / Clock output |
| ピン 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| ピン 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| ピン 12 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| ピン 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| ピン 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| ピン 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| ピン 16 | RC6/TX/CK — PORTC bit 6 / USART asynchronous transmit / synchronous clock |
| ピン 17 | RC7/RX/DT — PORTC bit 7 / USART asynchronous receive / synchronous data |
| ピン 18 | VSS — Ground reference |
| ピン 19 | VSS — Ground reference |
| ピン 20 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
| ピン 21 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
| ピン 22 | RB0/INT — PORTB bit 0 / External interrupt input |
| ピン 23 | RB1 — PORTB bit 1 |
| ピン 24 | RB2 — PORTB bit 2 |
| ピン 25 | RB3 — PORTB bit 3 |
| ピン 26 | RB4 — PORTB bit 4 |
| ピン 27 | RB5 — PORTB bit 5 |
| ピン 28 | RB6/PGC — PORTB bit 6 / ICSP clock input |
| ピン 29 | RB7/PGD — PORTB bit 7 / ICSP data input/output |
| ピン 30 | VSS — Ground reference |
| ピン 31 | VSS — Ground reference |
| ピン 32 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
| ピン 33 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
| ピン 34 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port data bit 0 |
| ピン 35 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port data bit 1 |
| ピン 36 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port data bit 2 |
| ピン 37 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port data bit 3 |
| ピン 38 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port data bit 4 |
| ピン 39 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port data bit 5 |
| ピン 40 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port data bit 6 |
| ピン 41 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port data bit 7 |
| ピン 42 | VSS — Ground reference |
| ピン 43 | RE0/RD — PORTE bit 0 / Parallel Slave Port read control |
| ピン 44 | RE1/WR — PORTE bit 1 / Parallel Slave Port write control |
主な用途
PIC16C74A-20/L の用途: 6 件s: Industrial Control Logic, Appliance Controllers, Automotive Body Electronics, Sensor Signal Conditioning, Consumer Electronics Embedded Control, Educational and Development Platforms.
Industrial Control Logic
The PIC16C74A-20/L is well-suited for industrial control logic applications such as motor controllers, conveyor sequencing, and PLC front-end logic. Its 20 MHz instruction cycle delivers 200 ns deterministic response times required for real-time control loops, while the 8-channel 8-bit ADC provides integrated sensor signal acquisition without external components. The 25 mA sink/source I/O capability can directly drive relays, solenoids, and opto-isolators - eliminating external driver stages. The wide 4.0-5.5 V supply range tolerates noisy industrial 24V-derived rails after regulation, and the 33 I/O pins accommodate multi-axis machines or sensor arrays. Brown-out reset and watchdog timer provide fault recovery needed for unattended factory installations. Drop-in compatibility with PIC16F74-I/L enables migration to flash memory when in-circuit firmware updates become necessary for deployed equipment.
おすすめ
Appliance Controllers
The PIC16C74A-20/L serves as an effective controller in home appliances such as washing machines, dishwashers, microwave ovens, and HVAC zone controllers. Its low power consumption (15 uA active at 5V/4 MHz, 1 uA standby) enables energy-efficient designs meeting Energy Star requirements. The integrated USART supports communication with display modules and external sensors, while the MSSP peripheral handles I2C EEPROM storage for user settings. The 2 CCP/PWM modules can directly drive brushless DC motor control signals or TRIAC phase-angle dimming circuits. The 192 bytes RAM accommodates real-time operating system kernels managing user interface, sensor sampling, and actuator drive concurrently. OTP memory suits high-volume appliance production where firmware is finalized and per-unit programming cost matters more than field updates.
おすすめ
Automotive Body Electronics
The PIC16C74A-20/L targets automotive body electronics subsystems including seat controllers, mirror positioners, window lift modules, and lighting controllers. The wide operating voltage tolerance and built-in brown-out reset handle automotive load-dump transients and cold-crank events common on 12V vehicle buses. The 8-bit ADC monitors battery voltage, current sense, and position feedback from potentiometers without external converters. PWM outputs drive LED tail-light brightness control or proportional valve actuation. The 25 mA I/O drives automotive-grade relays directly, simplifying BOM. Industrial temperature grade (-40C to +85C) variants like PIC16C74A-20I/L meet under-hood and cabin thermal requirements. The 33 I/O pins handle multi-channel sensor inputs (door switches, position sensors) plus multi-output actuator drive within a single MCU, reducing ECU count and harness complexity.
おすすめ
Sensor Signal Conditioning
The PIC16C74A-20/L is used as a smart sensor front-end conditioning unit for thermocouples, RTDs, strain gauges, pressure transducers, and flow meters. The 8-channel 8-bit ADC with multiplexed inputs scans multiple sensor types in sequence, while CCP modules generate excitation signals for bridge sensors. The integrated USART streams processed data to a host controller over RS-232/RS-485, eliminating the need for external signal conditioning ASICs. The 35-instruction RISC architecture executes linearization algorithms (Steinhart-Hart for thermistors, polynomial compensation for thermocouples) with deterministic cycle counts - critical for real-time process control loops. Low standby current (1 uA at 3V/32 kHz) enables battery-powered wireless sensor nodes with multi-year lifetime. The 20 MHz clock achieves adequate oversampling for 12-bit equivalent effective resolution after averaging.
おすすめ
Consumer Electronics Embedded Control
The PIC16C74A-20/L serves as a cost-effective control MCU in consumer electronics such as remote-controlled toys, electronic learning aids, fitness equipment, and small kitchen appliances. The OTP memory suits high-volume products where per-unit firmware is locked at production and the lowest possible unit cost is mandatory. The RISC architecture's deterministic 200 ns instruction execution at 20 MHz provides responsive user-interface handling without jitter. The integrated 8-bit ADC reads potentiometers, light sensors, and battery monitoring without external components. The 192-byte RAM hosts simple state machines and menu navigation buffers. PWM outputs drive motor speed control, LED brightness, or audio tone generation. Hardware peripherals (USART, I2C/SPI) allow connection to LCD displays, audio DACs, or wireless modules for connected consumer products. Industrial temp variants support outdoor fitness and garden equipment.
おすすめ
Educational and Development Platforms
The PIC16C74A-20/L (and its PIC16C74B-20/L successor) is used in university embedded systems courses and professional development training to teach microcontroller fundamentals. The 44-pin PLCC package fits standard IC sockets in training kits and breadboard adapters, simplifying lab exercises. The 35-instruction RISC ISA is approachable for first-time embedded programmers - all single-cycle except program branches, allowing students to count clock cycles accurately. OTP memory in commercial demonstration units forces students to verify code thoroughly before programming, building good engineering discipline. The complete PIC16C7X family datasheet (document 30412D) provides extensive register-level documentation and assembly examples suitable for textbook study. Migration to PIC16F74-I/L with flash memory allows iterative lab development, making these parts ideal for teaching both legacy OTP concepts and modern flash-based MCU design.
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: PIC16C74A-20/L — 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 | PIC16F74-I/L | PIC16C74B-20/L | PIC16C74A-20I/L | PIC16C74A-10/L | PIC16C74A-04I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PLCC-44 (J-Lead) | PLCC-44 (J-Lead) - same | PLCC-44 (J-Lead) - same | PLCC-44 (J-Lead) - same | PLCC-44 (J-Lead) - same | PLCC-44 (J-Lead) - same |
| Program Memory Type | OTP EPROM (7 KB) | Flash (7 KB, 1000+ erase cycles) | OTP EPROM (7 KB) | OTP EPROM (7 KB) | OTP EPROM (7 KB) | OTP EPROM (7 KB) |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 10 MHz | 4 MHz |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| ADC Channels | 8 channels, 8-bit | 8 channels, 8-bit | 8 channels, 8-bit | 8 channels, 8-bit | 8 channels, 8-bit | 8 channels, 8-bit |
| Operating Temperature | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) |
| Recommended Status | NRND (use PIC16F74) | Active (recommended replacement) | NRND | NRND | NRND | NRND |
主な差別化要因
- Manufacturer-recommended flash replacement available with identical pinout （vs PIC16F74-I/L)
- Improved silicon revision with bug fixes （vs PIC16C74B-20/L)
- Industrial temperature range variant for harsh environments （vs PIC16C74A-20I/L)
- Lower clock grade variants available for power-sensitive designs （vs PIC16C74A-10/L)
設計ノート
Decouple VDD pins (4 of them on PLCC-44: pins 20, 21, 32, 33) with 100 nF ceramic capacitors placed as close as possible to the package - each VDD pin requires its own decoupling capacitor, plus a bulk 10 uF tantalum or aluminum electrolytic at the regulator output. The four VSS pins (18, 19, 30, 31, 42) must all be connected to ground to provide adequate current return paths and reduce ground bounce during high-current I/O switching (25 mA sink/source).
OTP EPROM memory cannot be erased or re-programmed - once you write a bad firmware image to PIC16C74A-20/L, that device is bricked. For development and prototype work, use the CERDIP (windowed) variant PIC16C74A-20/JW with UV-erasable EPROM, or migrate to the flash-based PIC16F74-I/L which is pin-compatible and supports in-circuit reprogramming via ICSP. Never attempt to program production units until firmware has been fully validated on JW-windowed or PIC16F74 parts.
The PLCC-44 package requires a socket for prototype work and field serviceability - solder directly to PCB only for high-volume production where field replacement is not anticipated. Keep the crystal/oscillator traces short (under 10 mm) and surround with a ground guard ring to reduce EMI susceptibility. The MCLR/VPP pin (pin 1) should have a 10-100 kohm pull-up to VDD and a 100 nF cap to ground for proper reset behavior; do not leave MCLR floating as it can cause spurious resets or program-mode entry.
Estimated: at maximum operating frequency of 20 MHz with all I/O pins sourcing 25 mA simultaneously, the PIC16C74A-20/L can dissipate up to approximately 400-500 mW in PLCC-44 (theta_JA typically ~50 C/W for PLCC packages), yielding a junction temperature rise of 25C above ambient at room temperature. For sealed enclosures without airflow, derate I/O drive strength or limit concurrent active I/O to maintain junction temperature below 125C maximum rating.
コンプライアンス情報
PIC16C74A is NRND. RoHS/REACH/lead-free status not explicitly confirmed in verified web data; check Microchip product page for current compliance documentation. Industrial -40C to +85C variants (PIC16C74A-20I/L) are available but not AEC-Q100 qualified.
