PIC18LF452-I/L - 8-bit PIC MCU, 32KB Flash, 44-PLCC | Microchip
MPN: PIC18LF452-I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.77 | $13.77 |
| 10 | $12.39 | $123.90 |
| 100 | $10.45 | $1,045.00 |
| 500 | $8.95 | $4,475.00 |
| 1,000 | $7.85 | $7,850.00 |
PIC18LF452-I/L Overview
A PIC microcontroller is a Harvard-architecture CMOS RISC device that separates program and data memory buses, allowing simultaneous fetch and access. The PIC18 family is the upper tier of Microchip's 8-bit line, introducing 16-bit opcodes, a hardware multiplier, linear code space, and priority-enabled interrupts. The 'LF' suffix denotes an extended-voltage variant that runs at lower VDD (down to 2.0V), making it the right choice for battery-powered or low-voltage systems where the standard 'F' part would lose regulation. The PIC18LF452 sits in the family hierarchy as: PIC microcontroller -> PIC18 family -> PIC18F452 sub-family -> PIC18LF452 (low-voltage F452).
Key features include 32KB (16K x 16) Flash program memory, 1536 bytes of RAM, 256 bytes of EEPROM, 34 digital I/O pins, a 10-bit 8-channel Analog-to-Digital Converter (ADC), two analog comparators, two Capture/Compare/PWM (CCP) modules, an Enhanced Capture/Compare/PWM (ECCP) module, one USART, one MSSP (Master Synchronous Serial Port) for SPI/I2C, two 8-bit timers and three 16-bit timers, a parallel slave port, and an ICD (In-Circuit Debugger) interface. The instruction cycle time of 100 ns (at 40 MHz) gives deterministic timing for motor control and instrumentation loops.
Architecturally, the PIC18LF452-I/L uses a 16-bit instruction word and an 8-bit data path with a hardware multiply (8 x 8 in one cycle). The wide 2.5V/3.3V/5V operating range, combined with nanoWatt power-management modes (Sleep, Idle, and peripheral gating), supports low-power sensor and remote-monitoring nodes. The ADC's 10-bit resolution is adequate for thermocouple/thermistor front-ends and basic instrumentation, while the ECCP module delivers the PWM resolution needed for switched-mode power and motor drive.
Typical applications include industrial control panels, motor control (DC, stepper, BLDC), HVAC blowers and actuators, automotive body electronics (non-safety), sensor conditioning front-ends, instrument clusters, security panels, and general-purpose embedded control boards. The 44-pin PLCC package supports a through-hole socket for prototyping or field-replaceable designs, which is common in legacy industrial and aerospace instrumentation.
When designing with this part, verify the operating voltage range carefully: the 'F' variant operates from 4.2V to 5.5V, while the 'LF' variant runs from 2.0V to 5.5V. Use decoupling on each VDD/VSS pair, place the 20 MHz (or appropriate) resonator within 1 cm of OSC1/OSC2, and route the ICP/ICD signals away from switching nodes to preserve debug-session stability.
This page synthesizes distributor stock, parametric comparison, and drop-in alternatives not found in any single manufacturer datasheet - giving engineers a faster cross-reference path than manual datasheet correlation.
Drop-in alternatives for PIC18LF452-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 PIC18LF452-I/L (same form factor and footprint) — differing in Mounting Type, ADC, Operating Temperature, Communication, Data RAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF452-E/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F452-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F452T-I/L
✅ Drop-In✓ In Stock
$3.88 / Unit
View Datasheet →PIC18F452T-E/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF452-I/L Maximum Ratings & Electrical Characteristics
| Core | PIC 8-bit RISC |
| Family | PIC18 (PIC18F452 sub-family, LF = extended low-voltage) |
| Program Memory (Flash) | 32 KB (16K x 16 words) |
| RAM | 1536 bytes |
| EEPROM | 256 bytes |
| Max CPU Speed | 40 MHz (10 MIPS) |
| Instruction Cycle | 100 ns @ 40 MHz |
| Supply Voltage (VDD) | 2.0 V to 5.5 V (LF extended range; 2.5V/3.3V/5V nominal) |
| I/O Pins | 34 |
| ADC | 10-bit, 8 channels |
| Timers | 2 x 8-bit + 3 x 16-bit |
| CCP/ECCP | 2 CCP + 1 ECCP |
| Serial | 1 USART (RS-232/RS-485), 1 MSSP (SPI / I2C) |
| Comparators | 2 analog comparators |
| Parallel Slave Port | Yes |
| In-Circuit Debug | ICD/ICSP |
| Operating Temperature | -40 C to +85 C (industrial, 'I' suffix) |
| Package | 44-pin PLCC (16.59 x 16.59 mm) |
| Mounting Type | Surface Mount (PLCC socket compatible) |
| MSL Level | 3 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18LF452-I/L Pin Configuration
| Pin 1 | RB3/CCP2 — Digital I/O / Capture-Compare-PWM channel 2 |
| Pin 2 | RB4 — Digital I/O |
| Pin 3 | RB5 — Digital I/O |
| Pin 4 | RB6/PGC — Digital I/O / ICSP clock (ICD programming) |
| Pin 5 | RB7/PGD — Digital I/O / ICSP data (ICD programming) |
| Pin 6 | RB8 — Digital I/O |
| Pin 7 | RB9 — Digital I/O |
| Pin 8 | VSS — Ground |
| 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 — Digital I/O / SPI/I2C clock |
| Pin 13 | RC4 — Digital I/O / SPI/I2C data |
| Pin 14 | RC5 — Digital I/O |
| Pin 15 | RC6 — Digital I/O / USART TX |
| Pin 16 | RC7 — Digital I/O / USART RX |
| Pin 17 | VSS — Ground |
| Pin 18 | RD0 — Digital I/O / Parallel Slave Port data 0 |
| Pin 19 | RD1 — Digital I/O / Parallel Slave Port data 1 |
| Pin 20 | RD2 — Digital I/O / Parallel Slave Port data 2 |
| Pin 21 | RD3 — Digital I/O / Parallel Slave Port data 3 |
| Pin 22 | RD4 — Digital I/O / Parallel Slave Port data 4 |
| Pin 23 | RD5 — Digital I/O / Parallel Slave Port data 5 |
| Pin 24 | RD6 — Digital I/O / Parallel Slave Port data 6 |
| Pin 25 | RD7 — Digital I/O / Parallel Slave Port data 7 |
| Pin 26 | VSS — Ground |
| Pin 27 | RE0/RD — Digital I/O / Parallel Slave Port read |
| Pin 28 | RE1/WR — Digital I/O / Parallel Slave Port write |
| Pin 29 | RE2/CS — Digital I/O / Parallel Slave Port chip select |
| Pin 30 | AVSS — Analog ground |
| Pin 31 | RA0/AN0 — Digital I/O / Analog input 0 |
| Pin 32 | RA1/AN1 — Digital I/O / Analog input 1 |
| Pin 33 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC VREF- |
| Pin 34 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC VREF+ |
| Pin 35 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 36 | RA5/AN4 — Digital I/O / Analog input 4 |
| Pin 37 | OSC2/CLKOUT — Crystal output / clock output |
| Pin 38 | OSC1/CLKIN — Crystal input / external clock input |
| Pin 39 | VDD — Positive supply |
| Pin 40 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pin 41 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 42 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Pin 43 | MCLR/VPP — Master clear reset / programming voltage |
| Pin 44 | VDD — Positive supply |
Typical Applications
PIC18LF452-I/L is suitable for 6 applications: Industrial Motor Control, HVAC Blower and Actuator Control, Sensor Conditioning Front-End, Automotive Body Electronics (Non-Safety), Security and Alarm Panels, General Embedded Control Board.
Industrial Motor Control
The PIC18LF452-I/L drives brushed DC, stepper, and BLDC motors via its ECCP module generating complementary PWM with dead-band control, paired with the 10-bit ADC for current/voltage feedback. At 10 MIPS and 100 ns instruction cycle, it can execute a 4 kHz to 20 kHz torque-control loop with margin for UART diagnostics. The 2.0 V to 5.5 V supply simplifies designs using a single 24V-to-5V or 24V-to-3.3V buck.
Recommended
HVAC Blower and Actuator Control
In HVAC systems, the PIC18LF452-I/L serves as a low-cost controller for blower fan speed, damper position, and actuator sequencing. Its 2.0 V to 5.5 V input range accepts 24V-to-5V derived rails commonly found in furnace and air-handler control boards. The 34 I/O pins interface directly to TRIAC drivers, optocouplers, and temperature sensors, while the USART enables connection to building-automation controllers.
Recommended
Sensor Conditioning Front-End
The PIC18LF452-I/L handles analog sensor arrays using its 10-bit 8-channel ADC (up to 33 ksps at 5 V) and two analog comparators. Common use cases include strain-gauge bridges, thermistor linearization, and 4 mA to 20 mA loop readout. The 1536-byte RAM holds moving-average and digital-filter coefficients, while the 32 KB Flash stores calibration tables - sufficient for industrial instrumentation nodes.
Recommended
Automotive Body Electronics (Non-Safety)
For non-safety automotive subsystems such as seat controllers, mirror adjusters, and lighting nodes, the PIC18LF452-I/L's industrial temperature grade (-40 C to +85 C) provides adequate margin under-dash thermal stress. The 5 V-tolerant I/O and 40 MHz operation support LIN or CAN-style UART comms via external transceivers. The PLCC socket form factor eases field service for dealer-network warranty replacements.
Recommended
Security and Alarm Panels
The PIC18LF452-I/L is widely used in legacy security panels for zone-input monitoring (via 10-bit ADC or comparator), keypad scanning (using multiple I/O), and siren/strobe activation. The 32 KB Flash supports proprietary protocol stacks for central-station communication over the integrated USART. Its nanoWatt sleep modes extend battery life in wireless PIR or door-sensor nodes.
Recommended
General Embedded Control Board
The PIC18LF452-I/L anchors thousands of legacy and educational embedded designs, including hobby robotics, custom instruments, and university labs. The PLCC socket form factor supports insertion/removal without desoldering - critical for classroom training and rapid prototyping. With MPLAB X IDE, ICD debugging, and Microchip's XC8 compiler, the part retains an active ecosystem of tools, libraries, and application notes.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF452-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF452-E/L | PIC18F452-I/L | PIC18F452T-I/L | PIC18F452T-E/L |
|---|---|---|---|---|---|
| Package | 44-pin PLCC | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash (KB) | 32 | 32 | 32 | 32 | 32 |
| RAM (bytes) | 1536 | 1536 | 1536 | 1536 | 1536 |
| EEPROM (bytes) | 256 | 256 | 256 | 256 | 256 |
| Operating Voltage (V) | 2.0 to 5.5 | 2.0 to 5.5 | 4.2 to 5.5 | 4.2 to 5.5 | 4.2 to 5.5 |
| Max Clock (MHz) | 40 | 40 | 40 | 40 | 40 |
| Temperature Grade | Industrial -40 C to +85 C | Extended -40 C to +125 C | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Extended -40 C to +125 C |
Key Differentiators
- Extended low-voltage (LF) supply range 2.0 V to 5.5 V (vs PIC18F452-I/L)
- Industrial temperature grade -40 C to +85 C in the same footprint (vs PIC18LF452-E/L)
- 44-pin PLCC socket compatibility for field-replaceable designs (vs PIC18LF4520-I/PT)
Design Notes
Estimated: at 40 MHz with all peripherals enabled and 5 V VDD, the PIC18LF452-I/L core draws roughly 15-20 mA plus I/O current. For each VDD/VSS pin pair (pins 17, 26, 39, 44), place a 0.1 uF ceramic decoupling capacitor within 5 mm of the pin. Add a single 10 uF bulk capacitor near the package. For low-voltage 2.5V/3.3V rails, retain the same decoupling topology; the LF variant is fully functional below 4.2 V.
The 44-pin PLCC socket (e.g., 3M Textool or AMP) accepts pin-header inserts. Route the ICSP/ICD signals (PGC/PGD on RB6/RB7, MCLR on pin 43) to a dedicated 5-pin header with no series resistors; add a 10 kohm pull-up on MCLR. Place the resonator within 1 cm of OSC1/OSC2 (pins 37/38) and guard with a ground ring. For PLCC sockets, ensure the socket has a low-profile retention clip to avoid vibration-induced contact loss in industrial environments.
Do not confuse the PIC18LF452 (2.0 V to 5.5 V) with the PIC18F452 (4.2 V to 5.5 V) when designing for 3.3 V rails - the F variant will fail to start below 4.2 V. Always set the CONFIG3L LVP bit appropriately; the fresh device has LVP enabled and will use RB5/PGM as the programming pin. In-circuit debugger (ICD) connection requires ALL VSS pins (8, 17, 26) and ALL VDD pins (39, 44) to be present - missing one will cause programming failure.
For 10-bit ADC accuracy above 8 ENOB, source-impedance should stay below 5 kohm and the ADC acquisition time must be configured for the actual MUX channel impedance (TACQ = 2TAD + TCSS + TCOEF*(CHOLD)(RIC + RSS + RS)). Use the AVSS pin (30) and route the analog ground as a separate trace back to the power entry point. If using VREF+/VREF-, place a 0.1 uF + 10 uF buffer at the AVDD/VREF rail to absorb ADC current transients.
Compliance Information
RoHS and lead-free confirmed per Microchip product page and distributor listings. Not AEC-Q100 qualified; use PIC18LF452-E/L (extended temp) or AEC-Q100-specific PIC18 variants for automotive safety.
