PIC16F874A-I/ML - 8-bit PIC MCU, 7KB Flash, 44-pin QFN | Microchip
部品番号: PIC16F874A-I/ML ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.32 | $5.32 |
| 10 | $4.85 | $48.50 |
| 100 | $4.18 | $418.00 |
| 500 | $3.62 | $1,810.00 |
| 1,000 | $3.21 | $3,210.00 |
PIC16F874A-I/ML 概要
An 8-bit PIC microcontroller is a RISC-based computing core on a chip, integrating a CPU, non-volatile program memory, volatile data memory, peripherals, and I/O on a single die. Within the broader semiconductor taxonomy, PIC MCUs belong to the microcontroller family, which sits under the wider category of embedded computing devices and ultimately under integrated circuits. PIC16 series parts are Microchip's mid-range 8-bit line, providing a balance of code density, peripheral integration, and low cost that suits legacy and industrial designs.
The PIC16F874A-I/ML uses an enhanced Harvard architecture with separate program and data buses, allowing instruction fetch and operand access to occur simultaneously. Its 35 single-word instruction set simplifies coding in compilers such as XC8, while the 10-bit ADC and dual comparators ease mixed-signal front-end design. Brown-out Reset, Power-on Reset, and a watchdog timer with its own on-chip RC oscillator improve field reliability.
Typical applications include industrial control panels, motor control boards, automotive body electronics, sensor interfaces, instrumentation, and consumer appliances. The wide operating voltage range and on-chip peripherals also make the part attractive for battery-powered metering and HVAC controller boards. Compared to newer PIC18 devices, the PIC16F874A offers a familiar register model that simplifies porting of mature firmware.
When designing with this device, verify that the chosen development toolchain (MPLAB X IDE with XC8 compiler or legacy Hi-Tech PICC) supports the -I/ML temperature grade and QFN-44 footprint. Designers migrating from older PIC16F87x parts should review the A/D channel mapping and SSP module behavior, which were revised on the 874A/877A silicon compared to the original 874/877.
ドロップイン代替品: PIC16F874A-I/ML — 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: PIC16F874A-I/ML （同一形状・フットプリント） — 相違点: Package, Core Architecture, Operating Temperature, Serial Interfaces, ADC.
クイック比較ツール — 並列比較する代替部品を選択:
PIC16F877A-I/ML
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PIC16F873A-I/ML
✅ ドロップイン✓ 在庫あり
$2.32 / 個
データシートを見る →PIC16F874A-E/PT
✅ ドロップイン✓ 在庫あり
$7.45 / 個
データシートを見る →PIC16F874-04I/PT
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$5.4 / 個
データシートを見る →PIC18F44K22-I/ML
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$2.1 / 個
データシートを見る →PIC16F874A-I/ML 最大定格＆電気的特性
| Product Type | 8-bit PIC Microcontroller (MCU) |
| Series | PIC16F |
| Program Memory (Flash) | 7 KB |
| Data Memory (RAM) | 192 bytes |
| Data EEPROM | 128 bytes |
| Instruction Set | 35 single-word instructions |
| Instruction Execution Time | 200 ns |
| CPU Speed (max) | 20 MHz |
| Digital I/O Pins | 33 |
| Analog-to-Digital Converter | 8 channels x 10-bit |
| Analog Comparators | 2 |
| Capture/Compare/PWM Modules | 2 (CCP) |
| Serial Interfaces | USART + SSP (SPI / I2C) |
| In-Circuit Debug | Yes (ICD) |
| Self-Programming | Yes |
| Operating Voltage Range | 2.0 V to 5.5 V |
| 動作温度範囲 | -40 C to +85 C (Industrial, -I suffix) |
| パッケージ | 44-pin QFN (ML), exposed pad |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
PIC16F874A-I/ML ピン構成
| ピン 1 | MCLR/VPP/RE3 — Master Clear (Reset) input / Programming voltage / Digital I/O port E bit 3 |
| ピン 2 | RA0/AN0 — Digital I/O port A bit 0 / Analog input channel 0 |
| ピン 3 | RA1/AN1 — Digital I/O port A bit 1 / Analog input channel 1 |
| ピン 4 | RA2/AN2/VREF- — Digital I/O port A bit 2 / Analog input channel 2 / ADC VREF- |
| ピン 5 | RA3/AN3/VREF+ — Digital I/O port A bit 3 / Analog input channel 3 / ADC VREF+ |
| ピン 6 | RA4/T0CKI/C1OUT — Digital I/O port A bit 4 / Timer0 clock input / Comparator 1 output |
| ピン 7 | RA5/AN4/SS/C2OUT — Digital I/O port A bit 5 / Analog input channel 4 / SPI slave select / Comparator 2 output |
| ピン 8 | RE0/RD/AN5 — Digital I/O port E bit 0 / Parallel-port read strobe / Analog input channel 5 |
| ピン 9 | RE1/WR/AN6 — Digital I/O port E bit 1 / Parallel-port write strobe / Analog input channel 6 |
| ピン 10 | RE2/CS/AN7 — Digital I/O port E bit 2 / Parallel-port chip select / Analog input channel 7 |
| ピン 11 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| ピン 12 | VSS — Ground reference |
| ピン 13 | OSC1/CLKI — Oscillator crystal input / External clock input |
| ピン 14 | OSC2/CLKO — Oscillator crystal output / External clock output |
| ピン 15 | RC0/T1OSO/T1CKI — Digital I/O port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| ピン 16 | RC1/T1OSI/CCP2 — Digital I/O port C bit 1 / Timer1 oscillator input / CCP2 input/output |
| ピン 17 | RC2/CCP1 — Digital I/O port C bit 2 / CCP1 input/output |
| ピン 18 | RC3/SCK/SCL — Digital I/O port C bit 3 / SPI clock / I2C clock |
| ピン 19 | RD0/PSP0 — Digital I/O port D bit 0 / Parallel Slave Port bit 0 |
| ピン 20 | RD1/PSP1 — Digital I/O port D bit 1 / Parallel Slave Port bit 1 |
| ピン 21 | RD2/PSP2 — Digital I/O port D bit 2 / Parallel Slave Port bit 2 |
| ピン 22 | RD3/PSP3 — Digital I/O port D bit 3 / Parallel Slave Port bit 3 |
| ピン 23 | RC4/SDI/SDA — Digital I/O port C bit 4 / SPI data in / I2C data |
| ピン 24 | RC5/SDO — Digital I/O port C bit 5 / SPI data out |
| ピン 25 | RC6/TX/CK — Digital I/O port C bit 6 / USART TX / USART clock |
| ピン 26 | RC7/RX/DT — Digital I/O port C bit 7 / USART RX / USART data |
| ピン 27 | RD4/PSP4 — Digital I/O port D bit 4 / Parallel Slave Port bit 4 |
| ピン 28 | RD5/PSP5 — Digital I/O port D bit 5 / Parallel Slave Port bit 5 |
| ピン 29 | RD6/PSP6 — Digital I/O port D bit 6 / Parallel Slave Port bit 6 |
| ピン 30 | RD7/PSP7 — Digital I/O port D bit 7 / Parallel Slave Port bit 7 |
| ピン 31 | VSS — Ground reference (second VSS pin) |
| ピン 32 | VDD — Positive supply voltage (second VDD pin) |
| ピン 33 | RB0/INT — Digital I/O port B bit 0 / External interrupt |
| ピン 34 | RB1 — Digital I/O port B bit 1 |
| ピン 35 | RB2 — Digital I/O port B bit 2 |
| ピン 36 | RB3/PGM — Digital I/O port B bit 3 / Low-voltage programming input |
| ピン 37 | RB4 — Digital I/O port B bit 4 |
| ピン 38 | RB5 — Digital I/O port B bit 5 |
| ピン 39 | RB6/PGC — Digital I/O port B bit 6 / ICD clock |
| ピン 40 | RB7/PGD — Digital I/O port B bit 7 / ICD data |
| ピン 41 | VSS — Ground reference (third VSS pin) |
| ピン 42 | VDD — Positive supply voltage (third VDD pin) |
| ピン 43 | NC — Not connected (per datasheet) |
| ピン 44 | NC — Not connected (per datasheet) |
主な用途
PIC16F874A-I/ML の用途: 7 件s: Industrial Control Panels, Small Motor Control (Brushed DC, Fan Speed), Sensor Interface Boards, Consumer Appliance Control, Battery-Powered Metering, HVAC Controller Boards, Educational / Development Trainer Boards.
Industrial Control Panels
The PIC16F874A-I/ML fits industrial control panels because its 33 digital I/O lines can drive relays, optocouplers, and status LEDs directly while the 8-channel 10-bit ADC reads analog sensors such as pressure transducers, thermistors, and 4-20 mA loop interfaces. The 2.0V to 5.5V operating range accommodates 24V-bus-derived rails commonly used in factory PLCs, and the on-chip comparators implement window-comparator safety logic. The USART supports RS-485 transceivers for multi-drop fieldbus communication. Compared with discrete logic implementations, this MCU reduces BOM and simplifies firmware updates via ICD.
おすすめ
Small Motor Control (Brushed DC, Fan Speed)
In brushed DC motor and fan-speed control designs, the PIC16F874A-I/ML uses its two Capture/Compare/PWM modules to generate variable duty-cycle PWM signals for H-bridge drivers. The 200 ns instruction execution time supports up to 20 kHz PWM at 8-bit resolution, sufficient for most small-motor applications. The 10-bit ADC measures back-EMF for closed-loop speed regulation, while the comparators detect over-current faults via shunt amplifiers. The wide 2.0-5.5V supply range simplifies direct operation from motor supply rails through a small LDO.
おすすめ
Sensor Interface Boards
The PIC16F874A-I/ML is well-matched to multi-sensor interface boards thanks to its 8-channel 10-bit ADC, dual analog comparators, and MSSP supporting I2C/SPI sensor busses. The device can poll up to 8 analog sensors sequentially while communicating with digital sensors over the same I2C bus. The 128-byte EEPROM stores calibration coefficients, and the 192-byte RAM holds intermediate sensor data. The industrial -40 C to +85 C temperature grade supports outdoor enclosures, and the QFN-44 footprint allows compact sensor PCB designs.
おすすめ
Consumer Appliance Control
Consumer appliances such as washing machines, microwave ovens, and HVAC controllers commonly use the PIC16F874A-I/ML. The 7 KB Flash accommodates user-interface state machines and safety routines, while the 33 digital I/O drive seven-segment displays, keypads, and triac-based mains switches. The watchdog timer with its own on-chip RC oscillator improves reliability against mains-borne transients. Brown-out Reset and Power-on Reset protect EEPROM-stored settings. Compared with mask-ROM MCUs, the Flash-based PIC16F874A simplifies firmware revisions during appliance model lifecycles.
おすすめ
Battery-Powered Metering
Battery-powered metering designs leverage the PIC16F874A-I/ML's 2.0V to 5.5V operating range, low-power Sleep mode, and integrated 10-bit ADC. The device can wake from sleep on a watchdog timeout to take periodic ADC measurements, store averages in the 128-byte EEPROM, and transmit via the USART to a handheld reader. The 192 bytes of RAM are sufficient for cumulative counters and rolling averages, while the USART drives low-power sub-GHz transceivers or Bluetooth-HCI modules for AMI smart-meter designs.
おすすめ
HVAC Controller Boards
The PIC16F874A-I/ML fits HVAC controller boards because the 33 digital I/O drive damper actuators, fan relays, and triac-controlled compressors. The 8-channel ADC reads NTC temperature sensors, humidity probes, and pressure transducers, while the comparators enable thermostat-style on/off control without external op-amps. The wide 2.0-5.5V operating range simplifies 24VAC-derived power architectures. The 7 KB Flash and 192-byte RAM support PID loops for closed-loop temperature control with adequate headroom for firmware growth.
おすすめ
Educational / Development Trainer Boards
Universities and embedded-systems training labs favor the PIC16F874A-I/ML because the mid-range PIC16 instruction set has 35 single-word instructions that are easy to teach in a semester. The on-chip ICD interface allows in-circuit debugging without expensive emulators, and the QFN-44 footprint teaches modern SMD soldering skills. Standard peripheral set (10-bit ADC, SPI, I2C, USART, CCP) covers the full curriculum: ADC sampling, PWM generation, I2C sensor reads, and UART comms. The PIC16F874A is a stepping-stone to PIC18 and dsPIC devices.
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: PIC16F874A-I/ML — 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 | PIC16F877A-I/ML | PIC16F873A-I/ML | PIC16F874A-E/PT | PIC16F874-04I/PT | PIC18F44K22-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin QFN (ML) | 44-pin QFN (ML) - same | 44-pin QFN (ML) - same | 44-pin QFN (ML) - same | 44-pin QFN (ML) - same | 44-pin QFN (ML) - same |
| Program Memory (Flash) | 7 KB | 14 KB | 4 KB | 7 KB | 4 KB | 16 KB |
| RAM | 192 bytes | 256 bytes | 192 bytes | 192 bytes | 192 bytes | 768 bytes |
| EEPROM | 128 bytes | 256 bytes | 128 bytes | 128 bytes | 64 bytes | 256 bytes |
| Maximum CPU Speed | 20 MHz (200 ns) | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 64 MHz |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 1.8 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (Extended) | -40 C to +85 C | -40 C to +85 C |
| A/D Converter | 8 ch x 10-bit | 8 ch x 10-bit | 5 ch x 10-bit (28-pin variant limit) | 8 ch x 10-bit | 8 ch x 10-bit | 28 ch x 10-bit |
| Architecture | PIC16 (8-bit, 14-bit instructions) | PIC16 (8-bit, 14-bit instructions) | PIC16 (8-bit, 14-bit instructions) | PIC16 (8-bit, 14-bit instructions) | PIC16 (8-bit, 14-bit instructions) | PIC18 (8-bit, 16-bit instructions) |
主な差別化要因
- Highest memory density in same-footprint same-temperature PIC16F874A family （vs PIC16F873A-I/ML)
- Lower-cost drop-in option vs higher-density PIC16F877A （vs PIC16F877A-I/ML)
- Extended temperature range in same package （vs PIC16F874A-E/PT)
- Modern PIC18 upgrade path with same footprint （vs PIC18F44K22-I/ML)
設計ノート
Place a 100 nF decoupling capacitor as close as possible to each VDD pin (pins 11, 32, 42) and a bulk capacitor (typically 10 uF tantalum or 22 uF ceramic) within 25 mm. According to the Microchip PIC16F87xA datasheet (DS39582B), multiple VDD/VSS pin pairs exist on the QFN-44 package and each must be properly bypassed to prevent logic errors during ADC or PWM switching events. Brown-Out Reset (BOR) should be enabled in CONFIG to avoid EEPROM corruption during brown-out conditions.
The QFN-44 /ML package has an exposed thermal pad (EP) on the underside that MUST be soldered to a copper pad on the PCB, with multiple thermal vias connecting the pad to an internal ground plane. This provides the primary heat-dissipation path for the die. The QFN-44 thermal resistance (theta_JA) is approximately 28 C/W on a standard JEDEC 2s2p test board; without proper EP soldering, junction temperature can exceed rated limits in enclosed industrial enclosures. Recommended minimum copper area for the EP: at least 100 mm^2 with thermal via array.
Route analog input traces (RA0-RA5, RE0-RE2) away from digital switching signals such as PWM outputs (CCP1/CCP2) and oscillator pins to minimize ADC noise coupling. According to the Microchip PIC16F87xA datasheet (DS39582B), the ADC achieves 10-bit accuracy only when analog input source impedance is below 10 kohm and the ADC acquisition time meets the minimum specification (typically 19.7 us at 20 MHz). Add a small RC filter (100 ohm + 100 nF) on noisy analog inputs for additional anti-aliasing.
Do not confuse the original PIC16F874 (pre-A) silicon with the PIC16F874A. According to Microchip's part-numbering scheme, the PIC16F874 (original) was limited to 4 MHz and 4 KB Flash, while the PIC16F874A doubles speed to 20 MHz and adds A-silicon enhancements (revised A/D converter, BOR enhancements, and self-programming fixes). Designers porting code from PIC16F874 to PIC16F874A silicon may need to update the CONFIG word and verify ADC timing. Always reference the latest datasheet revision (DS39582B or newer) when designing in.
For I2C communication on the MSSP module (RC3/SCL, RC4/SDA), use pull-up resistors sized per the I2C bus capacitance and target speed. According to the Microchip PIC16F87xA datasheet (DS39582B), at 100 kHz Standard-mode and 400 kHz Fast-mode, typical pull-up values range from 2.2 kohm (smaller bus) to 10 kohm (larger bus). For SMBus compatibility, ensure the PIC16F874A's VDD is in the 3.0V to 5.5V range. The SDA/SCL pins also serve as digital I/O - configure them as inputs via TRIS to avoid contention with external pull-ups.
コンプライアンス情報
RoHS and REACH compliant per Microchip product page. The -I temperature suffix (industrial, -40 C to +85 C) is not AEC-Q100 qualified; for AEC-Q100 automotive applications use the -E (extended, -40 C to +125 C) variant or an automotive-grade MCU from Microchip's automotive portfolio.
