PIC18LC452T-I/L - 8-Bit 40MHz 32KB OTP MCU 44-PLCC | Microchip
MPN: PIC18LC452T-I/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.45 | $12.45 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.4 | $4,200.00 |
| 1,000 | $7.1 | $7,100.00 |
PIC18LC452T-I/L Overview
What is a PIC18C microcontroller? The PIC18C is Microchip Technology's original high-performance 8-bit MCU family that established the PIC18 architecture still in production today. The architecture family (PIC18) sits inside the broader microcontroller hierarchy: microcontroller -> embedded controller -> semiconductor IC. PIC18C devices offer C-friendly instruction sets, hardware multipliers, and rich peripheral integration including A/D converters and communication interfaces, making them foundational for embedded designs in industrial automation, consumer electronics, and automotive subsystems.
Key features include 33 digital I/O pins, an integrated 10-bit analog-to-digital converter, an external oscillator interface supporting up to 40 MHz (10 MIPS operation), and connectivity through I2C (MSSP), SPI, and UART/USART peripherals. A single-cycle hardware 8x8 multiplier accelerates arithmetic operations, while 16-bit wide instructions with an 8-bit data path provide efficient code density.
The LC-suffix device runs from a 2.5V to 5.5V supply, suitable for low-voltage and battery-backed designs where the standard PIC18F452 (Flash) variant is overkill. OTP program memory is one-time programmable, locking firmware at production time for cost-sensitive high-volume deployments.
Typical applications include industrial control systems, motor control boards, instrumentation with analog front-ends, and legacy embedded products where pin-compatible Flash migration is planned to PIC18F452. The 44-PLCC package also enables socketed prototyping and field replacement.
When designing, note that OTP memory cannot be reprogrammed - firmware bugs require a new part. For field-updatable designs choose the Flash-based PIC18F452-I/L (pin-compatible drop-in upgrade) instead.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18LC452T-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 PIC18LC452T-I/L (same form factor and footprint) — differing in ADC, Operating Temperature, Package, RAM Size, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LC452-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F452-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F452T-I/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.88 / Unit
View Datasheet →PIC18LC442T-I/L
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC18F442-I/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.75 / Unit
View Datasheet →PIC18LC452T-I/L Maximum Ratings & Electrical Characteristics
| Core | PIC18C, 8-bit |
| Program Memory Size | 32 KB (16K x 16) OTP |
| RAM Size | 1.5 KB (1.5K x 8) |
| Maximum Clock Speed | 40 MHz (10 MIPS) |
| Number of I/O Pins | 33 |
| ADC | 10-bit integrated |
| Supply Voltage | 2.5 V to 5.5 V (LC variant) |
| Operating Temperature | -40 C to +85 C (Industrial, -I suffix) |
| Package | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm |
| Connectivity | I2C (MSSP), SPI, UART/USART |
| Oscillator Type | External |
| Instruction Width | 16-bit instructions, 8-bit data path |
| Hardware Multiplier | 8x8 single-cycle |
| Packaging | Tape & Reel (T suffix) |
| RoHS Status | Compliant |
PIC18LC452T-I/L Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 3 | RA2/AN2 — Digital I/O / Analog input channel 2 |
| Pin 4 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC VREF+ |
| Pin 5 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 6 | RA5/AN4/SS — Digital I/O / Analog 4 / SPI slave select |
| Pin 7 | OSC1/CLKIN — External oscillator input |
| Pin 8 | OSC2/CLKOUT — External oscillator output |
| Pin 9 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Pin 10 | RC1/T1OSI — Digital I/O / Timer1 oscillator input |
| Pin 11 | RC2/CCP1 — Digital I/O / Capture/Compare/PWM 1 |
| Pin 12 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Pin 13 | RD0/PSP0 — Digital I/O / Parallel Slave Port bit 0 |
| Pin 14 | RD1/PSP1 — Digital I/O / Parallel Slave Port bit 1 |
| Pin 15 | RD2/PSP2 — Digital I/O / Parallel Slave Port bit 2 |
| Pin 16 | RD3/PSP3 — Digital I/O / Parallel Slave Port bit 3 |
| Pin 17 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Pin 18 | RC5/SDO — Digital I/O / SPI data out |
| Pin 19 | RC6/TX/CK — Digital I/O / UART TX / clock |
| Pin 20 | RC7/RX/DT — Digital I/O / UART RX / data |
| Pin 21 | RD4/PSP4 — Digital I/O / Parallel Slave Port bit 4 |
| Pin 22 | RD5/PSP5 — Digital I/O / Parallel Slave Port bit 5 |
| Pin 23 | RD6/PSP6 — Digital I/O / Parallel Slave Port bit 6 |
| Pin 24 | RD7/PSP7 — Digital I/O / Parallel Slave Port bit 7 |
| Pin 25 | VSS — Ground reference |
| Pin 26 | VDD — Positive supply (2.5V to 5.5V for LC variant) |
| Pin 27 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pin 28 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 29 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Pin 30 | RB3/CCP2 — Digital I/O / Capture/Compare/PWM 2 |
| Pin 31 | RB4 — Digital I/O / Interrupt-on-change |
| Pin 32 | RB5 — Digital I/O / Interrupt-on-change |
| Pin 33 | RB6/PGC — Digital I/O / ICSP clock (debug) |
| Pin 34 | RB7/PGD — Digital I/O / ICSP data (debug) |
| Pin 35 | RE0/RD — Digital I/O / Parallel port read control |
| Pin 36 | RE1/WR — Digital I/O / Parallel port write control |
| Pin 37 | RE2/CS — Digital I/O / Parallel port chip select |
| Pin 38 | VDD — Positive supply (second VDD pin) |
| Pin 39 | VSS — Ground (second VSS pin) |
| Pin 40 | MCLR/VPP — Master clear reset / Programming voltage |
| Pin 41 | RA6/OSC2 — Digital I/O / Alternate oscillator output |
| Pin 42 | RA7/OSC1 — Digital I/O / Alternate oscillator input |
| Pin 43 | NC — Not connected |
| Pin 44 | NC — Not connected |
Typical Applications
PIC18LC452T-I/L is suitable for 6 applications: Industrial Control Systems, Motor Control Boards, Test and Measurement Instrumentation, Legacy Embedded Products (Cost-Optimized Production), Automotive Body and Chassis ECUs, Consumer Electronics Controllers.
Industrial Control Systems
The PIC18LC452T-I/L's 40 MHz core and 33 I/O pins make it well-suited for industrial control PLCs and process controllers. Its 2.5V-5.5V supply range accommodates 3.24 V and 5 V industrial rails directly, while the integrated 10-bit ADC digitizes sensor signals from thermocouples, pressure transducers, and 4-20 mA loops without external conversion. The 1.5 KB RAM handles real-time control loops, and UART/USART enables Modbus RTU communication with SCADA systems. The OTP memory locks the control firmware at production time, preventing field tampering in safety-critical applications such as motor starters and conveyor controllers.
Recommended
Motor Control Boards
The PIC18LC452T-I/L drives stepper and brushless DC motor control boards using its 10-bit ADC for back-EMF sensing and 33 I/O pins for H-bridge gate drivers and Hall-effect feedback. The hardware 8x8 multiplier accelerates PID loop calculations at 10 MIPS throughput, while MSSP peripherals handle I2C encoder feedback and SPI communication with intelligent power modules (IPMs). The 44-PLCC package is socketed-friendly, allowing factory calibration and field replacement. Designers should note OTP memory prevents in-field tuning - consider PIC18F452-I/L for tuning-friendly production.
Recommended
Test and Measurement Instrumentation
The PIC18LC452T-I/L serves as the control core in bench-top instruments such as digital multimeters, panel meters, and data loggers. Its 10-bit resolution is adequate for voltmeters and ammeters, while UART/USART enables USB bridge connectivity to host PCs for data logging. The 1.5 KB RAM buffers measurement samples between transmissions, and 32 KB OTP accommodates calibration routines, display drivers, and serial protocol stacks. The industrial -40C to +85C temperature range supports laboratory and outdoor metering installations alike.
Recommended
Legacy Embedded Products (Cost-Optimized Production)
The PIC18LC452T-I/L is ideal for mature legacy products where the firmware is final and BOM cost dominates the design decision. OTP memory is cheaper per die than Flash, so the LC452T delivers lower unit cost in high-volume OEM deployments of products like appliance controllers, HVAC zone controls, vending machine interfaces, and irrigation timers. Once firmware is locked at production, OTP provides the lowest-cost path while the 44-PLCC package remains field-serviceable for warranty repair via part swap.
Recommended
Automotive Body and Chassis ECUs
The PIC18LC452T-I/L fits non-safety automotive body modules such as lighting controllers, seat adjusters, mirror positioners, and accessory multiplexers. The 40 MHz core handles LIN-bus protocol stacks via the UART peripheral, while the 10-bit ADC reads potentiometer positions for seat and mirror feedback. The -40C to +85C industrial temperature range covers most cabin environments. Note: automotive safety-critical modules require AEC-Q100 qualified parts - this part is not AEC-Q100 qualified, so use only in non-safety body ECUs.
Recommended
Consumer Electronics Controllers
The PIC18LC452T-I/L powers consumer appliances and audio/video accessories where cost dominates over flexibility. Its 32 KB OTP holds appliance control firmware and user-interface state machines, while 33 I/O pins drive seven-segment displays, button matrices, and relay outputs. I2C and SPI peripherals connect to LED drivers, audio DACs, and EEPROM storage for user preferences. The 2.5V-5.5V supply range supports both 3.3V and 5V designs, simplifying integration into mixed-voltage consumer systems like coffee machines, washing machines, and set-top boxes.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LC452T-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LC452-I/L | PIC18F452-I/L | PIC18F452T-I/L | PIC18LC442T-I/L | PIC18F442-I/L |
|---|---|---|---|---|---|---|
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB Flash | 32 KB Flash | 16 KB OTP | 16 KB Flash |
| RAM | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB | 768 B | 768 B |
| Operating Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.5 V to 5.5 V | 2.0 V to 5.5 V |
| ICSP / ICD Debug | ICSP only (no ICD) | ICSP only | ICSP + ICD | ICSP + ICD | ICSP only | ICSP + ICD |
| Packaging | Tape & Reel | Tube | Tube | Tape & Reel | Tape & Reel | Tube |
| Core Clock | 40 MHz (10 MIPS) | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
Key Differentiators
- Same 44-PLCC footprint as Flash-based siblings (vs PIC18F452-I/L)
- Tape & Reel packaging for high-volume SMT (vs PIC18LC452-I/L)
- Low-voltage 2.5V-5.5V operation for 3.3V systems (vs PIC18C452-I/L (standard C variant))
Design Notes
OTP memory is one-time programmable - firmware bugs cannot be fixed in the field. Validate firmware on PIC18F452-I/L (Flash) development boards before committing to PIC18LC452T-I/L production parts. The LC and F variants are pin-compatible so the same PCB layout supports both, but the LC variant does not support ICD in-circuit debugging. Estimated: a single firmware bug discovered after OTP programming costs 1000+ scrapped parts plus rework time.
The PIC18LC452T-I/L requires a stable 2.5 V to 5.5 V supply with adequate bulk decoupling. Place a 100 nF ceramic capacitor within 5 mm of each VDD pin (the device has two VDD pins at positions 26 and 38) and a 10 uF tantalum or aluminum bulk capacitor near the MCU. The LC variant has tighter voltage tolerance than the F variant, so use an LDO regulator (MCP1700) rather than a switching regulator to avoid ripple-induced brownouts. Estimated: a switching regulator with 50 mV ripple can cause intermittent ADC errors on the LC variant.
Route the external oscillator traces (OSC1/OSC2) as short as possible and guard them with ground pour to minimize EMI pickup. The 40 MHz maximum clock means the device generates up to 40 MHz harmonics - place the crystal within 10 mm of the OSC pins and use a ground flood on the layer beneath. For high-EMI environments add a 4.7 kohm resistor across the crystal to dampen overdrive. Estimated: long OSC traces (>20 mm) can cause oscillator startup failure at low temperatures.
The 10-bit ADC requires careful analog routing to achieve full resolution. Keep analog traces (RA0-RA5) away from digital switching signals (RB, RD ports and clock traces). Use a separate analog ground island if mixed-signal accuracy is required, joined at a single point near the MCU VSS pin. Place the ADC VREF decoupling capacitor (typically 100 nF) within 3 mm of the RA3/AN3/VREF+ pin when using external voltage reference.
At 40 MHz clock and full peripheral activity, the PIC18LC452T-I/L draws approximately 50 mA active current at 5 V. The 44-PLCC package has moderate thermal resistance suitable for commercial and industrial environments, but in enclosed housings above 70 C ambient, verify junction temperature via Microchip's thermal modeling tools. Estimated: at 85 C ambient and 250 mW dissipation, junction temperature rises approximately 40 C above ambient - within the 125 C junction limit but with limited margin.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - for automotive safety-critical applications use PIC18F46K80-I/P or similar AEC-Q100 qualified PIC18 variants. Halogen-free per Microchip green-compliance documentation.
