PIC18F242-E/SO - 8-Bit 40MHz 16KB Flash MCU | Microchip
部品番号: PIC18F242-E/SO ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $9.86 | $9.86 |
| 10 | $8.95 | $89.50 |
| 100 | $7.55 | $755.00 |
| 500 | $6.8 | $3,400.00 |
| 1,000 | $5.95 | $5,950.00 |
PIC18F242-E/SO 概要
A microcontroller (MCU) is a single-chip computer containing a CPU, memory, and programmable I/O peripherals. The PIC18F242 belongs to Microchip's PIC18 enhanced family, sitting between the legacy PIC16 baseline and PIC24/dsPIC 16-bit architectures. PIC18 devices use a RISC core with a 16-bit instruction word and 8-bit data path, providing higher code density and a C-friendly architecture compared to PIC16. Within Microchip's portfolio, PIC18 MCUs target mid-range embedded applications requiring richer peripherals than PIC16 but at lower cost than PIC24/dsPIC parts.
Key features of the PIC18F242-E/SO include five channels of 10-bit Analog-to-Digital conversion (ADC), two Capture/Compare/PWM (CCP) modules, a synchronous serial port configurable as 3-wire SPI or 2-wire I2C, an Enhanced USART (EUSART) for asynchronous or synchronous serial communication, and a wide 2.0V–5.5V operating voltage range. The 'E' suffix indicates the Extended temperature grade (-40°C to +125°C), suitable for industrial and harsh-environment designs.
The architecture combines a Harvard-bus RISC engine with hardware multiplier (8x8 in one cycle) and 32 kB of linear program addressing. Peripherals are memory-mapped, controlled via SFRs, and interrupt-driven, enabling responsive embedded control loops without CPU polling. The ICD interface provides real-time debug without removing the device from the board.
Typical applications include industrial sensor interfaces, motor control loops, low-power remote sensor nodes, embedded control in HVAC systems, and consumer appliance interfaces. The 28-SOIC package is well-suited for hand-soldered prototypes and through-hole-compatible PCB layouts.
When designing with this MCU, consider the timing budget at 40 MHz: each instruction cycle is 100 ns, so high-rate peripheral servicing must fit within the available interrupt latency. The Extended temperature grade (-40°C to +125°C) makes it suitable for outdoor or automotive under-hood applications.
ドロップイン代替品: PIC18F242-E/SO — 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: PIC18F242-E/SO （同一形状・フットプリント） — 相違点: Package, Operating Temperature, ADC, Self-Programming, Timers.
クイック比較ツール — 並列比較する代替部品を選択:
PIC18F242-I/SO
✅ ドロップイン✓ 在庫あり
$3.5 / 個
データシートを見る →PIC18F252-E/SO
✅ ドロップイン✓ 在庫あり
$5.78 / 個
データシートを見る →PIC18F252-I/SO
✅ ドロップイン✓ 在庫あり
$3.95 / 個
データシートを見る →PIC18F2420-E/SO
✅ ドロップイン✓ 在庫あり
$3.93 / 個
データシートを見る →PIC18F2420-I/SO
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PIC18F242-E/SO 最大定格＆電気的特性
| Core Architecture | PIC18 (8-bit RISC) |
| Program Memory (Flash) | 16 KB (8K x 16 words) |
| SRAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Instruction Set Size | 77 single-word instructions |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 23 |
| ADC | 10-bit, 5 channels |
| CCP Modules | 2 |
| Serial Interfaces | SPI / I2C (MSSP), Enhanced USART |
| Temperature Grade | Extended -40C to +125C (E suffix) |
| パッケージ | 28-SOIC (7.50 mm / 0.295 inch body width) |
| 実装タイプ | Surface Mount |
| Self-Programming | Yes |
| In-Circuit Debug (ICD) | Yes |
| RoHS ステータス | Compliant |
PIC18F242-E/SO ピン構成
| ピン 1 | MCLR/VPP/RA5 — Master Clear (reset) input / programming voltage / digital I/O RA5 |
| ピン 2 | RA0/AN0 — Digital I/O RA0 / Analog input AN0 |
| ピン 3 | RA1/AN1 — Digital I/O RA1 / Analog input AN1 |
| ピン 4 | RA2/AN2/VREF- — Digital I/O RA2 / Analog input AN2 / ADC negative reference |
| ピン 5 | RA3/AN3/VREF+ — Digital I/O RA3 / Analog input AN3 / ADC positive reference |
| ピン 6 | RA4/AN4/T0CKI — Digital I/O RA4 / Analog input AN4 / Timer0 clock input |
| ピン 7 | RA5/AN5/SS — Digital I/O RA5 / Analog input AN5 / SPI slave select |
| ピン 8 | VSS — Ground reference |
| ピン 9 | OSC1/CLKI — Crystal oscillator input / external clock input |
| ピン 10 | OSC2/CLKO — Crystal oscillator output / clock output |
| ピン 11 | RC0/T1OSO/T1CKI — Digital I/O RC0 / Timer1 oscillator output / Timer1 clock input |
| ピン 12 | RC1/T1OSI/CCP2 — Digital I/O RC1 / Timer1 oscillator input / CCP2 PWM output |
| ピン 13 | RC2/CCP1 — Digital I/O RC2 / CCP1 PWM output |
| ピン 14 | RC3/SCK/SCL — Digital I/O RC3 / SPI clock / I2C clock |
| ピン 15 | RC4/SDI/SDA — Digital I/O RC4 / SPI data in / I2C data |
| ピン 16 | RC5/SDO — Digital I/O RC5 / SPI data out |
| ピン 17 | RC6/TX/CK — Digital I/O RC6 / USART async transmit / USART sync clock |
| ピン 18 | RC7/RX/DT — Digital I/O RC7 / USART async receive / USART sync data |
| ピン 19 | VSS — Ground reference |
| ピン 20 | VDD — Positive supply voltage |
| ピン 21 | RB0/INT0 — Digital I/O RB0 / External interrupt 0 |
| ピン 22 | RB1/INT1 — Digital I/O RB1 / External interrupt 1 |
| ピン 23 | RB2/INT2 — Digital I/O RB2 / External interrupt 2 |
| ピン 24 | RB3/CCP2 — Digital I/O RB3 / CCP2 PWM output (alternate) |
| ピン 25 | RB4 — Digital I/O RB4 |
| ピン 26 | RB5 — Digital I/O RB5 |
| ピン 27 | RB6/PGC — Digital I/O RB6 / In-Circuit Debugger clock |
| ピン 28 | RB7/PGD — Digital I/O RB7 / In-Circuit Debugger data |
主な用途
PIC18F242-E/SO の用途: 6 件s: Industrial Sensor Interface, HVAC Control Systems, Consumer Appliance Control, Low-Power Remote Sensor Nodes, Motor Control Loops, Automotive Under-Hood Subsystems.
Industrial Sensor Interface
The PIC18F242-E/SO is well-matched to industrial sensor interfaces thanks to its 5 channels of 10-bit ADC, Extended -40C to +125C temperature grade, and 2.0V-5.5V supply range. The 10 MIPS CPU at 40 MHz easily handles multi-sensor polling, linearization routines, and 4-20 mA loop signal conditioning. Its 768 bytes SRAM accommodates rolling averages and calibration tables. Compared to PIC16, the PIC18's 16-bit instruction word improves code density for complex protocol stacks like Modbus RTU over the Enhanced USART. The 28-SOIC package keeps the design footprint compact for DIN-rail mounted conditioning modules.
おすすめ
HVAC Control Systems
The PIC18F242-E/SO fits HVAC control applications where its 5 ADC channels monitor temperature/humidity sensors and its two CCP modules generate PWM signals to drive damper actuators or variable-speed fan control. The 16 KB flash is sufficient for scheduling logic, PID loops, and user-interface state machines. Extended temperature operation ensures reliable startup in unconditioned mechanical rooms. Compared to PIC24 or dsPIC alternatives, PIC18F242 offers a lower cost point while still providing SPI for display drivers and I2C for EEPROM configuration storage.
おすすめ
Consumer Appliance Control
In white-goods and small appliances, the PIC18F242-E/SO serves as the main controller running motor algorithms, user-interface keypads, and LED/LCD display drivers. The Enhanced USART interfaces with Bluetooth or Wi-Fi modules for smart-appliance connectivity. 16 KB of flash holds washing-machine cycle profiles, dishwasher programs, or microwave user-interface firmware. The PIC18 C-compiler-friendly instruction set accelerates firmware development versus PIC16. 256 bytes EEPROM stores user preferences that survive power cycles.
おすすめ
Low-Power Remote Sensor Nodes
The PIC18F242-E/SO supports low-power remote sensor nodes where its 2.0V-5.5V range accepts direct battery or energy-harvester inputs. SLEEP/IDLE modes plus the ADC's ability to wake the CPU on threshold crossings enable multi-year battery life. The Enhanced USART and MSSP interface with LoRa, sub-GHz, or BLE modules for backhaul. 16 KB flash fits small protocol stacks (Modbus, custom sensor protocols) while leaving room for application logic. Compared to PIC16, PIC18 offers more peripherals in the same pin count.
おすすめ
Motor Control Loops
For basic motor control, the PIC18F242-E/SO provides two CCP modules generating complementary PWM outputs for brushed DC or simple BLDC commutation. At 40 MHz, the 100 ns instruction cycle supports closed-loop current/torque control with sufficient headroom for sensor sampling and ADC conversion. The 5-channel 10-bit ADC reads back EMF sensing, current shunts, or position encoders. Extended temperature grade enables under-hood automotive and industrial cabinet installations. 16 KB flash holds state-machine control firmware and fault-handling routines.
おすすめ
Automotive Under-Hood Subsystems
The PIC18F242-E/SO's Extended temperature grade (-40C to +125C) makes it a candidate for non-safety-critical automotive under-hood modules such as sensor clusters, lighting controllers, or auxiliary HVAC flaps. The 5-channel 10-bit ADC reads thermistors, pressure sensors, and position feedback. MSSP and EUSART interface with CAN/LIN transceivers for in-vehicle networking. Self-programming via ICSP supports dealer or factory firmware updates. While not AEC-Q100 qualified, its robust thermal range and 16 KB flash handle many legacy 12V body-electronics tasks.
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: PIC18F242-E/SO — 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 | PIC18F242-I/SO | PIC18F252-E/SO | PIC18F252-I/SO | PIC18F2420-E/SO |
|---|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 16 KB | 16 KB - identical | 32 KB (+100%) | 32 KB (+100%) | 16 KB - identical |
| SRAM | 768 bytes | 768 bytes - identical | 1536 bytes (+100%) | 1536 bytes (+100%) | 768 bytes - identical |
| EEPROM | 256 bytes | 256 bytes - identical | 256 bytes - identical | 256 bytes - identical | 256 bytes - identical |
| Maximum CPU Speed | 40 MHz (10 MIPS) | 40 MHz - identical | 40 MHz - identical | 40 MHz - identical | 40 MHz - identical |
| Temperature Grade | Extended -40C to +125C (E) | Industrial -40C to +85C (I) | Extended -40C to +125C (E) | Industrial -40C to +85C (I) | Extended -40C to +125C (E) |
| ADC Channels / Resolution | 5 ch / 10-bit | 5 ch / 10-bit - identical | 5 ch / 10-bit - identical | 5 ch / 10-bit - identical | 5 ch / 10-bit - identical |
主な差別化要因
- Extended temperature grade in same 28-SOIC package （vs PIC18F242-I/SO)
- Family upgrade path with identical pinout （vs PIC18F252-E/SO)
- Mature stable silicon versus newer flash variants （vs PIC18F2420-E/SO)
設計ノート
The PIC18F242-E/SO operates from 2.0V to 5.5V and draws typical supply current of less than 20 mA active at 40 MHz and less than 5 uA in SLEEP mode. For battery-powered designs, place a 100 nF decoupling capacitor within 5 mm of each VDD pin and a bulk 10 uF tantalum or ceramic capacitor near the IC. Estimated: at 5V VDD and 40 MHz, active current is approximately 16 mA, dropping to <1 uA in SLEEP with the ADC disabled.
Route the crystal traces (OSC1/OSC2) symmetrically and within 5 mm of the MCU, keeping them short and away from high-current switching traces. Add a 4-layer ground pour under the SOIC to reduce EMI. MCLR should be pulled up through a 10 kohm resistor with a 100 nF capacitor to VDD for noise immunity. The ICSP pins RB6/PGC and RB7/PGD must be accessible for programming - either keep them free of LED-driving circuitry or buffer them with series resistors to avoid programming interference.
Do not assume PIC18 source code is binary-compatible with PIC16 - the instruction set differs and requires recompilation. When migrating from PIC18F242 to PIC18F252, verify that any code relying on 768 bytes SRAM does not exceed the 1536-byte region, and confirm the IVT (interrupt vector table) handling for the larger Flash. The 'E' temperature grade (-40C to +125C) requires verification of crystal oscillator stability across the full range - some crystals lose startup margin at temperature extremes.
コンプライアンス情報
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - for automotive safety-critical applications, choose a PIC18 part with explicit automotive qualification. Halogen-free per Microchip environmental compliance documentation.
