PIC18F452-E/ML - 8-bit MCU, 32KB Flash, 40MHz, 44-QFN | Microchip
N.º da peça: PIC18F452-E/ML ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $9.04 | $9,04 |
| 10 | $8.41 | $84,10 |
| 100 | $7.49 | $749,00 |
| 500 | $6.95 | $3.475,00 |
| 1.000 | $6.32 | $6.320,00 |
PIC18F452-E/ML Visão geral
What is a PIC18F 8-bit microcontroller? The PIC18F family is Microchip's high-performance 8-bit architecture built on a Harvard RISC core, upward compatible with PIC16C5X/PIC12CXXX/PIC16CXX/PIC17CXX devices. It targets mid-range embedded designs requiring more code space, more peripherals, and faster throughput than the PIC16F baseline. In the broader taxonomy: PIC18F -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. This positioning makes it a workhorse for industrial control, instrumentation, and automotive subsystems.
Key features include 256 bytes of EEPROM, self-programming capability, an ICD (In-Circuit Debugger) interface, two Capture/Compare/PWM modules, an 8-channel 10-bit Analog-to-Digital converter, and a synchronous serial port configurable as either 3-wire SPI or 2-wire I2C. The C-compiler-friendly instruction set contains only 77 single-word instructions, lowering the learning curve for new firmware developers.
Architecturally, the PIC18F452 integrates a 16-bit wide instruction path with separate program and data buses, enabling single-cycle instruction fetch plus ALU operation in most cases. The 10-bit ADC with 8 channels supports acquisition of mixed analog signals from sensors, while the dual PWM modules provide flexible motor or power control. The extended temperature grade (E) plus QFN package make it suitable for thermally constrained or vibration-prone environments.
Typical applications include industrial automation controllers, HVAC peripherals, automotive body modules, sensor signal conditioning, and battery-powered metering. The combination of EEPROM storage and self-programming also supports field-upgradeable end products.
When designing with this device, ensure the 44-QFN exposed pad is properly soldered to a sufficiently large copper pour for thermal dissipation; QFN packages require careful PCB layout to avoid tombstoning. For new designs, consider the pin-compatible PIC18F4520 family which offers enhanced peripherals and nanoWatt technology for lower sleep current.
This page synthesizes distributor pricing, drop-in alternatives from the PIC18F family, and practical design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para PIC18F452-E/ML — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC18F452-E/ML (mesmo formato e footprint) — diferindo em Package, Program Memory (Flash), RAM, Operating Temperature, Serial Interfaces.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC18F452-I/ML
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PIC18F452T-E/ML
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PIC18F452-E/L
✅ Drop-In✓ Em estoque
$8.4 / unidade
Ver ficha técnica →PIC18F4520-I/ML
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PIC18F442-E/ML
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PIC18F4523T-I/ML
✅ Drop-In✓ Em estoque
$4.41 / unidade
Ver ficha técnica →PIC18F4525-I/PT
✅ Drop-In✓ Em estoque
$4.18 / unidade
Ver ficha técnica →PIC18F452-E/ML Classificações máximas e características elétricas
| Core Architecture | PIC 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 1536 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| I/O Pins | 34 |
| ADC | 10-bit, 8 channels |
| Timers | 1 x 8-bit + 3 x 16-bit |
| CCP/PWM Modules | 2 |
| Serial Interfaces | SPI, I2C (MSSP), USART |
| Operating Voltage | 2.0 V to 5.5 V |
| Temperatura de operação | -40C to +125C (Extended -E grade) |
| Encapsulamento | 44-pin QFN (8x8 mm) |
| Instruction Set | 77 instructions, 16-bit wide |
| Self-Programming | Yes (ICSP) |
| In-Circuit Debug | Yes (ICD) |
| Status RoHS | Compliant |
Configuração de pinos do PIC18F452-E/ML
| Pino 1 | MCLR — Master Clear (reset) input, active low |
| Pino 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pino 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pino 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / VREF- |
| Pino 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / VREF+ |
| Pino 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pino 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Pino 8 | RE0/RD/AN5 — PORTE bit 0 / read control / analog input 5 |
| Pino 9 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| Pino 10 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
| Pino 11 | VDD — Positive supply voltage |
| Pino 12 | VSS — Ground reference |
| Pino 13 | OSC1/CLKI — Crystal oscillator input / external clock in |
| Pino 14 | OSC2/CLKO — Crystal oscillator output / clock out |
| Pino 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| Pino 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 I/O |
| Pino 17 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| Pino 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pino 19 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pino 20 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pino 21 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pino 22 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pino 23 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| Pino 24 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| Pino 25 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| Pino 26 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| Pino 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| Pino 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| Pino 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| Pino 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| Pino 31 | VSS — Ground reference |
| Pino 32 | VDD — Positive supply voltage |
| Pino 33 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pino 34 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pino 35 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pino 36 | RB3/CCP2 — PORTB bit 3 / CCP2 I/O |
| Pino 37 | RB4 — PORTB bit 4 |
| Pino 38 | RB5/PGM — PORTB bit 5 / LVP programming |
| Pino 39 | RB6/PGC — PORTB bit 6 / ICD clock |
| Pino 40 | RB7/PGD — PORTB bit 7 / ICD data |
| Pino 41 | NC — Not connected (per datasheet) |
| Pino 42 | NC — Not connected (per datasheet) |
| Pino 43 | NC — Not connected (per datasheet) |
| Pino 44 | NC — Not connected (per datasheet) |
Aplicações típicas
PIC18F452-E/ML é adequado para 6 aplicaçãos: Industrial Automation Controller, Automotive Body Control Module, HVAC Peripheral Controller, Battery-Powered Smart Meter, Medical Monitoring Peripheral, Sensor Signal Conditioning Hub.
Industrial Automation Controller
The PIC18F452-E/ML is well suited for industrial PLC and motor-driver slave controllers because of its 32 KB FLASH (sufficient for state-machine + Modbus RTU stacks), 8-channel 10-bit ADC (sampling up to 8 sensor inputs concurrently), and two CCP/PWM modules (driving servo valves or stepper motor pulse/direction signals at 40 MHz). Its -40C to +125C extended temperature grade supports deployment near furnace exhausts and outdoor panels. The PIC18F452-E/ML's C-compiler-friendly 77-instruction set eases porting of control algorithms from ladder logic or higher-level languages. The PIC18F452-E/ML operates from 2.0-5.5 V, simplifying 24V-to-5V industrial bus implementations. Compared with PIC16F alternatives, this part's larger RAM (1536 B) handles Modbus buffers and PID controller histories without external memory.
Recomendado
Automotive Body Control Module
In automotive body and comfort modules (window lifters, mirror controllers, seat positioners), the PIC18F452-E/ML brings the -40C to +125C extended temperature range required for under-dash and door-mounted electronics, plus 34 I/O pins to drive relays, H-bridges, and switch-scan matrices. The 10 MIPS throughput handles LIN-like software UART alongside the hardware USART, while the dual PWM modules generate motor control signals. EEPROM (256 bytes) stores calibration and position memory across power cycles. The 44-pin QFN (8x8 mm) package is footprint-compatible with the PIC18F4520-I/ML, allowing easy migration to nanoWatt parts for key-off quiescent current reduction. The PIC18F452-E/ML's 2.0-5.5 V operation survives 12V automotive cranking transients when paired with a TVS-protected 5V regulator.
Recomendado
HVAC Peripheral Controller
The PIC18F452-E/ML fits HVAC peripheral designs (thermostats, damper actuators, fan-speed controllers) thanks to its 8-channel ADC for temperature/pressure sensing, dual PWM for proportional valve and blower control, and 32 KB FLASH for proportional-integral control loops with display menus. Its Extended temperature grade handles plenum-adjacent mounting where ambient can exceed +85C. The MSSP peripheral implements I2C communication with HVAC network transceivers or sensor front-ends, while the USART handles service-port diagnostics. Compared to PIC16F baselines, the PIC18F452-E/ML's 1536-byte RAM accommodates touchscreen UI buffers and scheduling state. Pin compatibility with PIC18F4520-I/ML enables drop-in upgrades to lower sleep current (nanoWatt) for battery-backed thermostat retention.
Recomendado
Battery-Powered Smart Meter
For battery-powered metering (water, gas, heat, energy submetering), the PIC18F452-E/ML's 32 KB FLASH stores protocol stacks (Wireless M-Bus, LoRaWAN node firmware) and 1536-byte RAM holds measurement buffers and encryption contexts. Its 2.0-5.5 V operation is ideal for 3.6V lithium thionyl chloride cells, and the 10-bit ADC captures pulse-output meter sensors. The Extended temperature grade suits outdoor meter enclosures. Sleep-mode current on the legacy PIC18F452 is relatively high (~50 uA typical), so for new designs the pin-compatible PIC18F4520-I/ML with nanoWatt technology (<1 uA sleep) is preferred, with the PIC18F452-E/ML remaining a viable option where firmware reuse is critical.
Recomendado
Medical Monitoring Peripheral
The PIC18F452-E/ML supports medical peripherals (patient monitors, infusion pump controllers, diagnostic instrument front-ends) requiring reliable 8-bit processing and extended temperature operation. Its 32 KB FLASH accommodates IEC 62304-friendly firmware architectures, the 8-channel 10-bit ADC acquires multiple bioelectric or optical sensor inputs, and EEPROM (256 bytes) stores calibration data. C-compiler friendliness and an ICD debug interface simplify validation. Note: while the PIC18F452-E/ML can be used in medical designs, end-product certification (FDA, CE-MDR) remains the integrator's responsibility, and newer pin-compatible parts like the PIC18F4520-I/ML offer better long-term availability for medical product life cycles.
Recomendado
Sensor Signal Conditioning Hub
The PIC18F452-E/ML serves as a multi-sensor signal-conditioning hub in industrial and instrumentation equipment, with 8 ADC channels for thermocouple/bridge/4-20 mA inputs and dual PWM for excitation or heater control. The 32 KB FLASH holds linearization tables and digital filter coefficients; 1536-byte RAM buffers sample streams before forwarding via SPI or USART. The Extended temperature grade suits unheated enclosures. Compared to smaller PIC16F parts, the PIC18F452-E/ML's C-friendly architecture enables complex math (Kalman filtering, FFT) without assembly. Pin compatibility with PIC18F4520-I/ML simplifies migration when nanoWatt features are needed. Combined with an external op-amp (e.g., MCP6N11) and precision reference, the PIC18F452-E/ML forms a complete 16-bit-class signal chain.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC18F452-E/ML — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC18F452-I/ML | PIC18F452T-E/ML | PIC18F4520-I/ML | PIC18F442-E/ML | PIC18F4523T-I/ML |
|---|---|---|---|---|---|---|
| Package | 44-pin QFN (8x8 mm) | 44-pin QFN (8x8 mm) - same | 44-pin QFN (8x8 mm) - same | 44-pin QFN (8x8 mm) - same | 44-pin QFN (8x8 mm) - same | 44-pin QFN (8x8 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| FLASH | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB | 32 KB |
| RAM | 1536 B | 1536 B | 1536 B | 1536 B | 768 B | 1536 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| CPU Speed | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| Temperature Grade | -40C to +125C (E) | -40C to +85C (I) | -40C to +125C (E) | -40C to +85C (I) | -40C to +125C (E) | -40C to +85C (I) |
| nanoWatt Technology | No | No | No | Yes | No | Yes |
Principais diferenciais
- Extended temperature grade qualified to +125C (vs PIC18F452-I/ML)
- Full 32 KB FLASH + 1536 B RAM headroom for protocols (vs PIC18F442-E/ML)
- QFN package with thermal pad for high-density layouts (vs PIC18F452-E/L (PLCC-44))
- Mature firmware ecosystem with legacy code reuse (vs PIC18F4520-I/ML)
Notas de projeto
Estimated: The PIC18F452-E/ML 44-QFN package exposes a thermal pad on the underside that MUST be soldered to a ground copper pour of at least 1 square inch (645 mm^2) to meet the -40C to +125C thermal envelope. Without proper thermal connection, junction temperature can rise ~25C above ambient per watt of internal dissipation. Failure to solder the thermal pad results in tombstoning during reflow and chronic reliability problems. Use via-in-pad or via-fan patterns to maximize heat transfer to inner copper layers.
Place a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pair (the PIC18F452-E/ML has two VDD/VSS pairs at pins 11/12 and 31/32). Add a bulk 10 uF tantalum or ceramic capacitor near the supply pins. The ADC's VREF+ pin (RA3) should be bypassed with a 100 nF ceramic when used; noisy VREF directly couples into ADC readings and degrades effective ENOB by 1-2 bits.
The PIC18F452-E/ML's MCLR pin (pin 1) MUST be tied to VDD through a 10 kohm resistor for normal operation; leaving it floating causes unpredictable resets. If using ICD debugging, MCLR is driven by the debugger and the pull-up should be removed. Also note: the RB5/PGM pin is used for low-voltage programming - never tie it directly to VDD; route through a 10 kohm pull-up to avoid programming interference.
Keep analog inputs (RA0-RA5, RE0-RE2) physically separated from switching signals (PWM outputs, oscillator traces) on the PCB to minimize crosstalk into ADC readings. The PIC18F452 datasheet recommends a ground plane under the analog section with a single-point connection to digital ground near the MCU's VSS pins. Route the crystal traces (OSC1/OSC2) with short, symmetric traces and guard them with ground to reduce EMI.
The PIC18F452-E/ML's parallel slave port (PORTD) can capture external bus data but only at the system clock rate; verify that external timing meets the tRD setup and hold specifications in the datasheet to avoid data corruption. The MSSP peripheral operating in I2C mode requires 4.7 kohm pull-ups on SDA/SCL for standard-mode (100 kHz); for fast-mode (400 kHz) use 2.2 kohm pull-ups. Slew-rate control is not configurable on this legacy part, so external filtering may be required in EMI-sensitive environments.
Informações de conformidade
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - this part is Extended temp grade (-E) but does not carry automotive qualification. For AEC-Q100 automotive designs consider PIC18F452 family with /VAO suffix or migrate to PIC18F458 (CAN) or PIC18F46K22.
