PIC18F4520-I/P - 8-bit MCU 32KB Flash 40MHz DIP-40 | Microchip
料号： PIC18F4520-I ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $6.11 | $3,055.00 |
| 1,000 | $5.55 | $5,550.00 |
PIC18F4520-I 概述
An 8-bit microcontroller (MCU) is a single integrated circuit that contains a processor core, program memory, data memory, and peripherals such as timers, serial interfaces, and analog-to-digital converters. Within the power-management hierarchy of embedded systems, the MCU sits at the application layer, coordinating sensors, actuators, and communication interfaces. The PIC18 family is Microchip's enhanced mid-range 8-bit architecture, a successor to the PIC16 line, optimized for C compiler efficiency.
Key differentiating features include a C-compiler-optimized RISC core with an 8 x 8 single-cycle hardware multiplier, nanoWatt Technology power-management modes with an internal oscillator block covering 31 kHz to 8 MHz, Fail-Safe Clock Monitor, and an extended instruction set. A 10-bit analog-to-digital converter with up to 13 channels, two CCP (Capture/Compare/PWM) modules plus one ECCP module, an enhanced USART, and a parallel slave port round out the peripheral set.
Architecturally, the PIC18F4520 uses a modified Harvard architecture with a 16-bit instruction word and 8-bit data path, executing most instructions in a single cycle (200 ns at 40 MHz crystal-derived Fosc/4). Operation spans a 4.2 V to 5.5 V supply, making it well suited to 5 V industrial logic environments where 3.3 V MCUs require level shifting.
Typical applications include industrial control and automation, legacy equipment maintenance and upgrades, motor control via the ECCP module, and educational/hobby embedded platforms, where the through-hole DIP-40 package simplifies prototyping and socketed replacement.
A key design consideration is supply voltage: the -I industrial temperature version requires 4.2 V to 5.5 V, so a 5 V regulated rail and 5 V-tolerant peripherals are assumed; the LF variant (PIC18LF4520) covers 2.0 V to 5.5 V for low-voltage designs.
This page synthesizes distributor pricing, verified drop-in alternatives within the PIC18 DIP-40 family, pinout data, and practical design notes not found in the manufacturer datasheet, providing engineers a single decision-ready reference as of 2026-10-12.
直接替换替代料： PIC18F4520-I ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC18F4520-I （相同外形与封装尺寸） ——差异在于 Operating Temperature, Package, ADC, Timers, Mounting Type.
快速对比工具——选择替代料号进行并排对比：
PIC18F4525-I/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.18 / 个
查看数据手册 →PIC18F4523-I/P
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.82 / 个
查看数据手册 →PIC18F4550-I/PT
✅ 直接替换✓ 有现货
$4.95 / 个
查看数据手册 →PIC18F45K22-I/P
✅ 直接替换✓ 有现货
$2.1 / 个
查看数据手册 →PIC18F452-I/P
✅ 直接替换✓ 有现货
$5.1 / 个
查看数据手册 →PIC18F4520-I 最大额定值与电气特性
| Core Size | 8-bit |
| Core Architecture | PIC18 RISC (modified Harvard) |
| Program Memory Type | Flash |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 1,536 bytes |
| EEPROM Size | 256 bytes |
| Maximum Clock Speed | 40 MHz |
| Performance | Up to 10 MIPS |
| Supply Voltage Range | 4.2 V to 5.5 V |
| Number of I/O | 36 |
| ADC Resolution | 10-bit |
| ADC Channels | Up to 13 |
| CCP / PWM Modules | 2 x CCP + 1 x ECCP |
| Communication Interfaces | USART, SPI (MSSP), I2C (MSSP), Parallel Slave Port |
| Internal Oscillator | 31 kHz to 8 MHz |
| 工作温度 | -40C to +85C (I grade) |
| 封装 | 40-pin PDIP (0.600 inch) |
| 安装类型 | Through-Hole |
| Low Power Technology | nanoWatt Technology |
| 生命周期状态 | ACTIVE |
PIC18F4520-I 引脚配置
| 引脚 1 | MCLR/VPP/RE3 — Master clear reset / programming voltage / digital input |
| 引脚 2 | RA0/AN0 — Port A digital I/O / ADC channel 0 |
| 引脚 3 | RA1/AN1 — Port A digital I/O / ADC channel 1 |
| 引脚 4 | RA2/AN2/VREF- — Port A I/O / ADC channel 2 / ADC negative reference |
| 引脚 5 | RA3/AN3/VREF+ — Port A I/O / ADC channel 3 / ADC positive reference |
| 引脚 6 | RA4/T0CKI/C1OUT — Port A I/O / Timer0 clock input / comparator 1 output |
| 引脚 7 | RA5/AN4/SS/HLVDIN/C2OUT — Port A I/O / ADC channel 4 / SPI slave select / HLVD input / comparator 2 output |
| 引脚 8 | RE0/RD/AN5 — Port E I/O / PSP read strobe / ADC channel 5 |
| 引脚 9 | RE1/WR/AN6 — Port E I/O / PSP write strobe / ADC channel 6 |
| 引脚 10 | RE2/CS/AN7 — Port E I/O / PSP chip select / ADC channel 7 |
| 引脚 11 | VDD — Positive supply (4.2 V to 5.5 V) |
| 引脚 12 | VSS — Ground reference |
| 引脚 13 | OSC1/CLKI/RA7 — Oscillator crystal input / external clock input / Port A I/O |
| 引脚 14 | OSC2/CLKO/RA6 — Oscillator crystal output / clock output / Port A I/O |
| 引脚 15 | RC0/T1OSO/T13CKI — Port C I/O / Timer1 oscillator output / Timer1/3 external clock |
| 引脚 16 | RC1/T1OSI/CCP2 — Port C I/O / Timer1 oscillator input / Capture-Compare-PWM 2 |
| 引脚 17 | RC2/CCP1 — Port C I/O / Capture-Compare-PWM 1 (ECCP) |
| 引脚 18 | RC3/SCK/SCL — Port C I/O / SPI clock / I2C clock |
| 引脚 19 | RD0/PSP0 — Port D I/O / Parallel slave port bit 0 |
| 引脚 20 | RD1/PSP1 — Port D I/O / Parallel slave port bit 1 |
| 引脚 21 | RD2/PSP2 — Port D I/O / Parallel slave port bit 2 |
| 引脚 22 | RD3/PSP3 — Port D I/O / Parallel slave port bit 3 |
| 引脚 23 | RC4/SDI/SDA — Port C I/O / SPI data in / I2C data |
| 引脚 24 | RC5/SDO — Port C I/O / SPI data out |
| 引脚 25 | RC6/TX/CK — Port C I/O / USART transmit / synchronous clock |
| 引脚 26 | RC7/RX/DT — Port C I/O / USART receive / synchronous data |
| 引脚 27 | RD4/PSP4 — Port D I/O / Parallel slave port bit 4 |
| 引脚 28 | RD5/PSP5 — Port D I/O / Parallel slave port bit 5 |
| 引脚 29 | RD6/PSP6 — Port D I/O / Parallel slave port bit 6 |
| 引脚 30 | RD7/PSP7 — Port D I/O / Parallel slave port bit 7 |
| 引脚 31 | VSS — Ground reference |
| 引脚 32 | VDD — Positive supply (4.2 V to 5.5 V) |
| 引脚 33 | RB0/INT0 — Port B I/O / external interrupt 0 |
| 引脚 34 | RB1/INT1 — Port B I/O / external interrupt 1 |
| 引脚 35 | RB2/INT2 — Port B I/O / external interrupt 2 |
| 引脚 36 | RB3/INT3/CCP2 — Port B I/O / external interrupt 3 / alternate CCP2 |
| 引脚 37 | RB4/KB0 — Port B I/O / interrupt-on-change / keypad input 0 |
| 引脚 38 | RB5/KB1/PGM — Port B I/O / interrupt-on-change / low-voltage programming pin |
| 引脚 39 | RB6/KB2/PGC — Port B I/O / interrupt-on-change / ICSP clock |
| 引脚 40 | RB7/KB3/PGD — Port B I/O / interrupt-on-change / ICSP data |
典型应用
PIC18F4520-I 适用于 6 应用s: Industrial Control and Automation, Legacy Equipment Maintenance and Upgrades, DC and Small BLDC Motor Control, Data Acquisition and Sensor Nodes, Embedded Education and Prototyping, Consumer Appliance Control Panels.
Industrial Control and Automation
The PIC18F4520-I fits industrial control nodes because its 4.2 V to 5.5 V supply matches legacy 5 V sensor and relay logic without level shifting, and its -40C to +85C industrial temperature rating survives cabinet environments. The parallel slave port on PORTD allows the MCU to bus-interface with a host processor, while the MSSP module drives SPI/I2C peripherals such as EEPROMs and displays. Placed on a control board with the ECCP generating PWM at up to 10-bit resolution, it closes analog control loops using the 10-bit ADC's 13 channels. Compared with modern 3.3 V MCUs, it trades current consumption for direct 5 V compatibility, cutting BOM complexity in brownfield retrofits.
推荐
Legacy Equipment Maintenance and Upgrades
For servicing equipment originally designed around the PIC18F452 or PIC16F877A, the PIC18F4520-I is Microchip's sanctioned migration target (application note 39647a), sharing the DIP-40 footprint so the same socket accepts the upgraded silicon. Its 32 KB Flash doubles the PIC18F452's program space, letting service engineers add features to firmware that no longer fits. The through-hole DIP-40 package permits socketed replacement in the field without hot-air rework, and ICSP via RB6/RB7 allows in-place reprogramming. Keeping the 5 V operating range preserves the original power supply and peripheral interfacing, minimizing recertification effort for regulated legacy systems.
推荐
DC and Small BLDC Motor Control
The PIC18F4520-I supports economical motor control through its ECCP module, which provides half-bridge and full-bridge PWM outputs with programmable dead-band delay and auto-shutdown fault protection - essential for H-bridge drive safety. The 10-bit ADC samples current-sense shunts or back-EMF feedback at up to 100 kSPS-class rates, while Timer2-derived PWM frequency is configurable to the tens of kHz range typical of small motor drives. The 8 x 8 hardware multiply accelerates PI loop arithmetic in firmware. For brushed DC motors and small sensorless BLDC fans, this peripheral set delivers closed-loop control on a sub-USD 9 MCU in a hand-solderable DIP-40 package.
推荐
Data Acquisition and Sensor Nodes
With a 10-bit ADC offering up to 13 multiplexed channels and software-selectable VREF+ / VREF- pins (RA2/RA3), the PIC18F4520-I aggregates analog sensors such as thermistors, pressure bridges, and 4-20 mA receivers. The nanoWatt Technology idle modes and Fail-Safe Clock Monitor maintain acquisition reliability, while the internal 31 kHz to 8 MHz oscillator removes the crystal BOM item in relaxed-timing nodes. Sampled data streams out through the enhanced USART to RS-485 converters or is stored in the 256-byte EEPROM for calibration constants. Because the whole acquisition chain operates at 5 V, ratiometric sensor bridges interface directly without external level translation circuitry.
推荐
Embedded Education and Prototyping
The PIC18F4520-I remains a mainstay of embedded-systems coursework because the DIP-40 through-hole package can be inserted into a breadboard or ZIF socket, students can replace damaged chips in seconds, and the PIC18 instruction set teaches RISC fundamentals without the complexity of Cortex-M register suites. MPLAB X IDE with the XC8 compiler and a PICkit 5 programmer forms a complete sub-USD 100 lab. The internal oscillator means a working program needs only 5 V and MCLR pulled high, and the 36 I/O pins drive LEDs, LCDs, keypads, and servos directly at 5 V logic - no level shifters required for typical classroom peripheral sets.
推荐
Consumer Appliance Control Panels
Appliance control boards - washers, ovens, ventilation systems - historically standardized on 5 V 8-bit MCUs, and the PIC18F4520-I maintains that compatibility: its 25 mA-class I/O sink/source drives LEDs and triac-driver optocouplers directly, the ECCP generates mains-dimming or heater PWM, and the ADC reads NTC thermistors and user potentiometers across 13 channels. The watchdog timer with its own internal oscillator plus brown-out reset provides the fail-safe behavior appliance safety assessments expect. Because the part is active in production with RoHS-compliant packaging, appliance OEMs can keep existing PIC18F4520 firmware and PCBs in production without redesign, preserving certification files and test fixtures.
推荐
推荐产品汇总
工程参考数据： PIC18F4520-I ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC18F4525-I/P | PIC18F4523-I/P | PIC18F4550-I/P | PIC18F45K22-I/P | PIC18F452-I/P |
|---|---|---|---|---|---|---|
| Package | 40-pin PDIP (0.600 in) | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Program Memory | 32 KB | 48 KB | 32 KB | 32 KB | 32 KB | 16 KB |
| SRAM | 1,536 bytes | 3,968 bytes | 1,536 bytes | 2,048 bytes | 3,896 bytes | 1,536 bytes |
| ADC Resolution | 10-bit, 13 ch | 10-bit, 13 ch | 12-bit, 13 ch | 10-bit, 13 ch | 10-bit, 35 ch | 10-bit, 8 ch |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 1.8 V to 5.5 V | 4.2 V to 5.5 V |
| Special Peripherals | PSP, ECCP, USART, MSSP | 3x CCP + ECCP, PSP | PSP, ECCP, 2x CCP | Full-Speed USB 2.0 | 2x UART, 2x ECCP | PSP, CCP, USART |
| Lifecycle Status | Active | Active | Active | Active | Active | Not Recommended for New Designs |
关键差异点
- True 5 V industrial operation without level shifters （对比 PIC18F45K22-I/P)
- Double the Flash and nanoWatt modes vs the predecessor （对比 PIC18F452-I/P)
- Higher precision analog option available in the same footprint （对比 PIC18F4523-I/P)
- USB capability when the socketed design needs connectivity （对比 PIC18F4550-I/P)
设计说明
The PIC18F4520-I requires 4.2 V to 5.5 V; do not power it from 3.3 V rails or brown-out behavior will be unpredictable. Decouple both VDD pins (11 and 32) with 100 nF ceramic capacitors placed within 5 mm of each pin, plus one 10 uF bulk capacitor per board. Microchip's datasheet specifies brown-out reset configurable via configuration bits - enable it for 5 V industrial supplies that sag during motor start. If a 3.3 V design is planned, select the PIC18LF4520 or the PIC18F45K22 (1.8 V to 5.5 V) instead of forcing level shifters.
RB6 (PGC, pin 39) and RB7 (PGD, pin 40) double as ICSP programming lines; series-isolate external loads on these pins with 10k resistors or programmers will fail to connect. Never drive MCLR (pin 1) with a bare pushbutton - use a 10k pull-up to VDD and a 100 ohm to 1k series resistor to the switch, because MCLR doubles as the ~13 V VPP programming input in normal (non-LVP) ICSP. Finally, remember the PIC18 ADC requires its acquisition time (TACQ) and that RA2/RA3 must be configured as references in software before analog reads are ratiometric.
On socketed DIP-40 legacy boards, keep the crystal (OSC1/OSC2, pins 13/14) within 20 mm of the MCU with 22 pF loading capacitors per Microchip's oscillator tables; long crystal traces on through-hole boards pick up noise from relay coils sharing the ground return. Route the analog ADC channel traces (RA0-RA5) away from the CCP/ECCP PWM outputs (RC1, RC2, RB3) - PWM edges couple tens of millivolts of charge injection into adjacent ADC inputs through parasitic capacitance. Tie VSS pins 12 and 31 to a solid ground plane, not a daisy-chained trace.
Estimated: at 5 V supply and 40 MHz with all ports active, typical PIC18F4520 supply current is on the order of tens of mA (datasheet typical figures apply), so junction dissipation stays well under 0.25 W and the PDIP package needs no heatsink. Thermal management only becomes a consideration if heavily loaded I/O pins continuously source/sink their maximum rated current; in that case, verify total device power against the datasheet PD-max for the -40C to +85C industrial range and derate linearly above 25C ambient.
合规信息
Current PIC18F4520-I/P SKUs from Microchip are RoHS-compliant, lead-free. REACH, halogen-free, and conflict-minerals status not stated in provided data.
