PIC18F452T-I/PT - 8-bit 40MHz 32KB Flash MCU 44-TQFP | Microchip
MPN: PIC18F452T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.1 | $71.00 |
| 100 | $6.3 | $630.00 |
| 500 | $5.6 | $2,800.00 |
| 1,000 | $5 | $5,000.00 |
PIC18F452T-I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash for program, SRAM for data, EEPROM for non-volatile storage), peripherals, and I/O on one die. Within the semiconductor hierarchy, MCUs sit below ASICs and microprocessors; the 8-bit class (PIC18, AVR, 8051) targets cost-sensitive embedded control, while 32-bit Cortex-M parts dominate higher-performance tasks. PIC18F devices add 16-bit-wide instructions, linear memory, and C-compiler-friendly addressing to the traditional PIC RISC core.
Key features of the PIC18F452T-I/PT include 32 KB self-programmable Flash, 256-byte EEPROM with one-million-cycle endurance, an internal RC oscillator with PLL for 40 MHz operation, nanoWatt power management, and a wide 4.2 V to 5.5 V supply range. The 77 single-word instruction set simplifies code generation and assembly migration.
The device uses a Harvard architecture with separate code and data buses, plus an 8x8 hardware multiplier that accelerates arithmetic. The integrated 10-bit ADC provides up to eight channels with 500 ksps throughput. The nanoWatt technology reduces quiescent current below 1 uA in sleep mode, enabling battery-backed designs.
Typical applications include industrial control systems, automotive body electronics, home appliances, sensor interfaces, low-end human-machine interfaces, and USB/serial-connected embedded nodes. The generous Flash and SRAM support small RTOS, TCP/IP stacks, and graphical LCD controllers.
Designers should place 0.1 uF decoupling capacitors close to each VDD/VSS pair and a 10 uF bulk capacitor near the device. Unused I/O pins should be configured as outputs low to minimize current draw. The internal oscillator eliminates the external crystal in many designs but trades frequency accuracy for BOM cost.
This page synthesizes distributor pricing, drop-in alternatives drawn from Microchip's own PIC18F family, and practical design notes not found in the manufacturer datasheet. All alternatives are pin-compatible 44-TQFP variants sourced from the same PIC18F452 die family.
Drop-in alternatives for PIC18F452T-I/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC18F452T-I/PT (same form factor and footprint) — differing in Package, Operating Temperature, Timers, ADC, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F452-I/PT
✅ Drop-In✓ In Stock
$5.84 / Unit
View Datasheet →PIC18F4520-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4525-I/PT
✅ Drop-In✓ In Stock
$4.18 / Unit
View Datasheet →PIC18F442T-I/PT
✅ Drop-In✓ In Stock
$5.41 / Unit
View Datasheet →PIC18F448T-I/PT
✅ Drop-In✓ In Stock
$7.9 / Unit
View Datasheet →PIC18F452T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit Harvard, enhanced) |
| CPU Speed | 40 MHz (10 MIPS) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data SRAM | 1.5 KB (1536 bytes) |
| Data EEPROM | 256 bytes |
| Digital I/O Pins | 34 |
| ADC | 10-bit, 8 channels |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| Operating Temperature (Industrial) | -40 C to +85 C |
| Timers | 4 (Timer0/1/2/3) |
| Capture/Compare/PWM (CCP) | 2 modules |
| Serial Interfaces | 1x USART, 1x MSSP (SPI/I2C) |
| Instruction Set | 77 single-word instructions |
| Package | 44-pin TQFP (10x10 mm), tape and reel |
| RoHS Status | Compliant |
| MSL Level | 3 |
| Lead Finish | Matte tin (lead-free) |
| Mounting Type | Surface Mount |
PIC18F452T-I/PT Pin Configuration
| Pin 1 | MCLR/VPP/RE3 — Reset input / programming voltage / PORTE bit 3 |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS/LVDIN — PORTA bit 5 / analog input 4 / SPI slave select / LVD input |
| Pin 8 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock / PORTA bit 7 |
| Pin 9 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / PORTA bit 6 |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 18 | VSS — Ground reference |
| Pin 19 | VDD — Positive supply (4.2-5.5 V) |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply (4.2-5.5 V) |
| Pin 22 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 23 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 24 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 25 | RB3/CCP2 — PORTB bit 3 / CCP2 alternate |
| Pin 26 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Pin 27 | RB5 — PORTB bit 5 (interrupt-on-change) |
| Pin 28 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 29 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply (4.2-5.5 V) |
| Pin 32 | RD0/PSP0 — PORTD bit 0 / parallel slave port data 0 |
| Pin 33 | RD1/PSP1 — PORTD bit 1 / parallel slave port data 1 |
| Pin 34 | RD2/PSP2 — PORTD bit 2 / parallel slave port data 2 |
| Pin 35 | RD3/PSP3 — PORTD bit 3 / parallel slave port data 3 |
| Pin 36 | RD4/PSP4 — PORTD bit 4 / parallel slave port data 4 |
| Pin 37 | RD5/PSP5 — PORTD bit 5 / parallel slave port data 5 |
| Pin 38 | RD6/PSP6 — PORTD bit 6 / parallel slave port data 6 |
| Pin 39 | RD7/PSP7 — PORTD bit 7 / parallel slave port data 7 |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply (4.2-5.5 V) |
| Pin 42 | RE0/RD/AN5 — PORTE bit 0 / read control / analog input 5 |
| Pin 43 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| Pin 44 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
Typical Applications
PIC18F452T-I/PT is suitable for 6 applications: Industrial Control Systems, Home Appliance Control, Automotive Body Electronics, Sensor Interface and Data Acquisition, HMI and Display Controllers, Serial-Connected Embedded Nodes.
Industrial Control Systems
The PIC18F452T-I/PT fits industrial control with its 32 KB Flash for ladder-logic and PID algorithms, 8-channel 10-bit ADC for sensor input, and -40 C to +85 C industrial temperature range. The 10 MIPS throughput easily handles 1 kHz control loops for motor drives, valve actuators, and process instrumentation. Placed on a DIN-rail or panel-mount PCB with 24 V-to-5 V isolated supply, the MCU drives relays and reads 4-20 mA loops through the ADC. Compared to CPLD-based controllers, the integrated peripherals reduce BOM cost and PCB area substantially. The wide 4.2-5.5 V supply tolerance accommodates industrial 5 V rails with significant noise margin.
Recommended
Home Appliance Control
The PIC18F452T-I/PT is well matched to white-goods appliance control boards where 8-bit PIC familiarity, low cost, and proven reliability matter most. Its 32 KB Flash stores state-machine firmware for washing machines, dishwashers, and microwave ovens, while the 1.5 KB SRAM holds display buffer and sensor history. The 4 timers plus 2 CCP modules generate PWM for motor speed control and buzzer tones. With 34 I/O pins, the MCU drives keypads, seven-segment displays, and triac-fired heater loads directly. Compared to newer Cortex-M0 designs, the PIC18 toolchain is shorter and firmware is portable across many appliance platforms.
Recommended
Automotive Body Electronics
The PIC18F452T-I/PT powers body-electronics modules such as instrument clusters, HVAC panels, and seat controllers where moderate computation and many GPIO are needed. Its 8-channel 10-bit ADC reads temperature, position, and light sensors, while PWM drives analog gauges and LED backlights. For under-hood or harsh-environment modules the E temperature grade is preferred, but the I grade suffices for cabin modules. The USART links to companion CAN or LIN transceivers, allowing integration into vehicle networks. Compared to dedicated automotive MCUs like the PIC18F46K80, the 452 family is more cost-effective for non-safety body domains.
Recommended
Sensor Interface and Data Acquisition
The PIC18F452T-I/PT handles multi-channel data acquisition where 32 KB Flash hosts averaging/filtering algorithms and 1.5 KB SRAM buffers sensor frames. The 10-bit ADC at 8 channels provides enough resolution for temperature, pressure, and humidity sensors; an external 12-bit ADC upgrade path is straightforward via SPI. The MSSP peripheral talks to SPI sensors while USART streams data to a host PC or wireless module. Compared to dedicated DAQ ASICs, the PIC18F452T-I/PT delivers full programmability at a unit price around $5 at qty 1000.
Recommended
HMI and Display Controllers
The PIC18F452T-I/PT drives character LCDs, small graphical OLEDs, and keypad/scanner interfaces for human-machine interface modules. Its 34 I/O pins handle 4x4 key matrices, multiple LED indicators, and parallel LCD data buses without external logic. The 1.5 KB SRAM holds double-buffered display frames for 128x64 pixel OLEDs. The CCP modules generate beep tones and backlight PWM. Compared to FPGA-based display controllers, the PIC18F452T-I/PT is dramatically simpler to program and substantially cheaper for sub-256-pixel displays.
Recommended
Serial-Connected Embedded Nodes
The PIC18F452T-I/PT operates as a sensor node that communicates via RS-232, RS-485, or TTL UART to a host controller. The on-chip USART handles asynchronous serial up to 460 kbaud without CPU intervention, freeing the 10 MIPS core for sensor processing. The MSSP adds SPI/I2C to talk to EEPROM, RTC, or peripheral sensors. Industrial nodes use this MCU as a low-cost alternative to 32-bit parts. Compared to USB-based designs, the UART interface is simpler to isolate and immune to host-OS driver issues.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F452T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F452-I/PT | PIC18F4520-I/PT | PIC18F4525-I/PT | PIC18F442T-I/PT | PIC18F448T-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10) | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 48 KB (+50%) | 16 KB (-50%) | 16 KB (-50%) |
| SRAM | 1.5 KB | 1.5 KB | 1.5 KB | 3.4 KB | 768 B | 768 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| ADC Resolution / Channels | 10-bit / 8-ch | 10-bit / 8-ch | 10-bit / 13-ch | 12-bit / 11-ch | 10-bit / 8-ch | 10-bit / 8-ch |
| CAN Module | No | No | Yes (ECAN) | No | No | Yes (CAN) |
| Operating Temperature (I grade) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Tray vs Tape-and-Reel packaging option within the same die (vs PIC18F452-I/PT)
- Software-compatible upgrade path to enhanced peripherals (vs PIC18F4520-I/PT)
- 8-channel 10-bit ADC balances analog channels with Flash size (vs PIC18F4525-I/PT)
Design Notes
Place one 0.1 uF decoupling capacitor as close as possible to each VDD/VSS pin pair (pins 19-20, 30-31, 40-41) and a single 10 uF tantalum or ceramic bulk capacitor near the device. The PIC18F452T-I/PT draws peaks up to 50 mA during Flash programming, so the bulk cap prevents VDD droop that could corrupt write operations. Add a 10 kohm pull-up on MCLR (pin 1) for normal operation, and a diode clamp if using ICSP to protect against programmer-induced overvoltage.
Route the crystal traces (OSC1 pin 8 / OSC2 pin 9) as short as possible and symmetric, surrounded by a ground guard ring to minimize EMI coupling. Keep the crystal within 10 mm of the MCU. The AVDD/AVSS pair should be tied to filtered digital supplies through a ferrite bead or RC filter; never share analog ground return paths with switching node currents. Place the ICSP header (PGC pin 28, PGD pin 29) on a 0.1-inch connector accessible without removing the PCB from its enclosure.
Do not exceed 25 mA per I/O pin or 200 mA total PORTB/GND sink current, otherwise latch-up risk increases. Always configure unused I/O pins as outputs driving low to minimize sleep-mode current below the 1 uA nanoWatt specification. When migrating code between PIC18F452 and PIC18F4520, verify the config bits for the ECAN module are correct, otherwise the chip will appear dead at first power-up. Note the I grade is -40 to +85 C only - for automotive use choose the E or E-pt grade.
Compliance Information
RoHS and lead-free per Microchip product page. Industrial -40 to +85 C grade only; not AEC-Q100 qualified - choose E-grade variant for automotive applications.
