PIC18C452T-I/L - 8-Bit PIC18 MCU 32KB OTP 40MHz | Microchip
MPN: PIC18C452T-I/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.95 | $79.50 |
| 100 | $7.18 | $718.00 |
| 500 | $6.4 | $3,200.00 |
| 1,000 | $5.75 | $5,750.00 |
PIC18C452T-I/L Overview
An 8-bit microcontroller (MCU) is a small computer-on-a-chip built around an 8-bit data path. Within the broader product taxonomy, an 8-bit MCU sits below 16-bit and 32-bit microcontrollers in processing power but offers the lowest cost, simplest programming model, and lowest power consumption for embedded control. The PIC18 family specifically extends the legacy PIC16 instruction set to 16-bit wide opcodes with 8-bit data, providing C-friendly architecture and up to 10 MIPS performance while retaining RISC simplicity (77 single-word instructions).
Key differentiating features of the PIC18C452T-I/L include 32KB of OTP program memory (16K x 16 organization), 1.5KB of general-purpose RAM, 256 bytes of EEPROM data memory, 34 bidirectional I/O pins, and a 10-bit successive-approximation ADC with up to 8 input channels. Other on-chip peripherals include two 8-bit timers, three 16-bit timers, two capture/compare/PWM (CCP) modules, an enhanced USART, an MSSP (SPI / I2C master-slave) port, a parallel slave port, and a single-cycle hardware 8x8 multiplier.
The architecture implements a Harvard design with separate program and data buses, 16-bit instructions and 8-bit data path, an 8-level hardware stack, and prioritized interrupts. The PLL block allows operation from 4 MHz to 10 MHz oscillator sources while delivering 40 MHz internal execution, giving system designers flexibility in clock selection. The CMOS process provides low-power operation suitable for industrial and consumer embedded applications.
Typical applications include industrial control systems, motor control, sensor interfaces, instrumentation, building automation, HVAC controllers, security and alarm panels, and automotive body electronics. The combination of OTP memory, ample RAM, and rich peripheral set makes the PIC18C452T-I/L a strong fit for medium-complexity embedded designs requiring moderate code size and deterministic real-time response.
When designing with this part, note that OTP memory can be programmed only once; for prototyping or field-updatable designs choose the flash-based PIC18F452 equivalent. The PLCC-44 package is legacy through-hole J-lead; modern designs often migrate to the PIC18F452 in PLCC-44 or 40-pin PDIP, or to surface-mount TQFP/QFN variants. Ensure decoupling capacitors are placed close to VDD/VSS pairs per Microchip PIC18C452 datasheet recommendations.
This page synthesizes distributor stock, pricing, drop-in PIC18C452 family alternatives, and practical design guidance beyond what is available in the Microchip datasheet alone.
Drop-in alternatives for PIC18C452T-I/L — 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 PIC18C452T-I/L (same form factor and footprint) — differing in Mounting Type, Core, ADC, Hardware Multiplier, Hardware Stack.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18C452T-E/L
✅ Drop-In✓ In Stock
$13.1 / Unit
View Datasheet →PIC18C452-I/L
✅ Drop-In✓ In Stock
$7.94 / Unit
View Datasheet →PIC18F452-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18C452T-I/L Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC18C RISC |
| Instruction Set Width | 16-bit instructions, 8-bit data |
| Program Memory | 32 KB (16K x 16) OTP |
| RAM | 1.5 KB (1536 bytes) |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 40 MHz (10 MIPS) |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| CCP Modules | 2 |
| Serial Interfaces | USART (enhanced), MSSP (SPI / I2C), Parallel Slave Port |
| Hardware Multiplier | 8-bit x 8-bit single-cycle |
| Interrupt Priority Levels | High / Low (2 levels) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm |
| Mounting Type | Surface Mount (PLCC J-Lead) |
PIC18C452T-I/L Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pin 2 | OSC1/CLKI — Oscillator crystal input / external clock in |
| Pin 3 | OSC2/CLKO — Oscillator crystal output / clock out |
| Pin 4 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin 7 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / voltage reference |
| Pin 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 13 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 14 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 15 | RB3/CCP2 — PORTB bit 3 / CCP2 input/output |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5/PGM — PORTB bit 5 / low-voltage programming |
| Pin 18 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 19 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply voltage |
| Pin 22 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 osc out / Timer1 clock |
| Pin 23 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 osc in / CCP2 |
| Pin 24 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| Pin 25 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 26 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 27 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 28 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 29 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| Pin 33 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| Pin 34 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| Pin 35 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| Pin 36 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| Pin 37 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| Pin 38 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| Pin 39 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply voltage |
| Pin 42 | RE0/RD/AN5 — PORTE bit 0 / read strobe / analog input 5 |
| Pin 43 | RE1/WR/AN6 — PORTE bit 1 / write strobe / analog input 6 |
| Pin 44 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
Typical Applications
PIC18C452T-I/L is suitable for 6 applications: Industrial Control Systems, Sensor Interface and Data Acquisition, Motor Control and PWM Drives, Building Automation and HVAC, Security and Alarm Panels, Consumer Embedded Appliances.
Industrial Control Systems
The PIC18C452T-I/L fits industrial control with its 32 KB OTP program memory, 1.5 KB RAM, and 40 MHz / 10 MIPS core providing deterministic real-time response for PLCs and discrete I/O controllers. Its 34 digital I/O pins can directly interface to opto-isolated inputs, relay drivers, and 24 V industrial signal levels, while the two CCP modules deliver PWM and event-capture for motor and valve control.
Recommended
Sensor Interface and Data Acquisition
The PIC18C452T-I/L suits sensor-interface and data-acquisition designs via its on-chip 10-bit ADC with up to 8 input channels, supporting direct connection to thermocouples, RTDs, and strain-gauge bridges through external signal conditioning. With 1.5 KB of RAM, it can buffer moderate ADC sample streams before transmission over the enhanced USART or MSSP (SPI/I2C) peripherals, easing host-MCU loading in distributed sensor networks.
Recommended
Motor Control and PWM Drives
The PIC18C452T-I/L is well-suited to motor control with two CCP modules producing up to 10-bit PWM outputs for DC and stepper motor drives. Its three 16-bit timers provide precise period measurement for closed-loop speed control, while 34 I/O pins handle quadrature encoder inputs and direction-control signals. The 10 MIPS throughput executes PID control loops comfortably within millisecond control intervals typical of small industrial motors.
Recommended
Building Automation and HVAC
The PIC18C452T-I/L powers building-automation and HVAC controllers thanks to its industrial temperature grade (-40 C to +85 C) and ample peripheral set. Its 10-bit ADC reads temperature, humidity, and pressure sensors, the USART links to networked thermostats and BACnet/Modbus bridges, and the 32 KB OTP holds HVAC state-machine and scheduling firmware. CCP-driven PWM outputs can modulate damper and valve actuators directly without external driver ICs.
Recommended
Security and Alarm Panels
The PIC18C452T-I/L is a strong fit for security panels: its 34 I/O pins accommodate multiple zone inputs, sirens, keypad scanners, and indicator LEDs directly, while the enhanced USART interfaces to central-station modems or IP-comm modules. With 32 KB of OTP memory and 1.5 KB RAM, it holds full zone-monitoring, event-logging, and dialer firmware for residential and light-commercial alarm panels.
Recommended
Consumer Embedded Appliances
The PIC18C452T-I/L drives consumer appliances such as washing machines, dishwashers, and small kitchen equipment where cost-sensitive 8-bit control suffices. Its single-cycle hardware 8x8 multiplier accelerates sensor linearization routines, 34 I/O pins handle user-interface keypads and seven-segment displays, and the MSSP peripheral drives LED-driver ICs over SPI. Industrial temperature rating supports under-cabinet appliance environments reliably.
Recommended
Recommended Products Summary
Engineering reference data for PIC18C452T-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18C452T-E/L | PIC18C452-I/L | PIC18F452-I/L |
|---|---|---|---|---|
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC18C 8-bit | PIC18C 8-bit | PIC18C 8-bit | PIC18F 8-bit |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB Flash |
| RAM | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB |
| Maximum CPU Frequency | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| Operating Temperature | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C |
| Packaging Format | Tape & Reel | Tape & Reel | Tray | Tube / Tape & Reel |
| Reprogrammable | No (OTP) | No (OTP) | No (OTP) | Yes (Flash) |
Key Differentiators
- Extended-temperature variant for harsh environments (vs PIC18C452T-E/L)
- Tray-packaged variant for hand-load production (vs PIC18C452-I/L)
- Flash-based drop-in for in-field reprogrammability (vs PIC18F452-I/L)
Design Notes
Place 100 nF decoupling capacitors as close as possible to every VDD/VSS pair on the 44-PLCC footprint (pins 11/10, 21/20, 31/30, 41/40). For designs where VDD is near the upper 5 V limit, add a bulk 10 uF tantalum or ceramic capacitor near the IC supply pins to suppress switching transients from the ADC and CCP PWM outputs.
OTP memory on PIC18C452T-I/L can only be programmed once - a programming error requires a new device. Use a pre-programmed PIC18F452-I/L or PIC18F452T-I/L development board to validate firmware before committing OTP devices. Also confirm the PLCC J-lead socket orientation: pin 1 is marked by an indented dot on the package top, not at the chamfered corner alone.
Keep analog traces (RA0-RA5, RE0-RE2 used as AN5-AN7) short and routed away from CCP PWM outputs and digital switching signals to preserve ADC accuracy. The 44-pin PLCC's exposed lead frame allows a small copper pour under the package tied to VSS for thermal relief, which is useful when running the ADC continuously at full sampling rate.
Compliance Information
Microchip PIC18C family predates full RoHS/REACH documentation standards. Refer to the official Microchip PIC18C452 product page and your distributor's compliance statement for confirmation before placing new-production orders.
