PIC18F45K42-I/PT - 8-Bit 64MHz XLP MCU 32KB Flash TQFP-44
MPN: PIC18F45K42-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.65 | $2.65 |
| 10 | $2.4 | $24.00 |
| 100 | $2.05 | $205.00 |
| 500 | $1.78 | $890.00 |
| 1,000 | $1.52 | $1,520.00 |
PIC18F45K42-I/PT Overview
An 8-bit PIC microcontroller is a Harvard-architecture RISC processor that executes instructions in a single cycle (except branches), with separate program and data buses. In the system hierarchy, the PIC18F45K42 belongs to the microcontroller class of embedded computing devices, which sits under the broader category of microprocessors and semiconductors. The PIC18 family is Microchip's mainstream 8-bit line, optimized for low-power (XLP - eXtreme Low Power) and mixed-signal embedded designs where deterministic real-time control is more important than raw arithmetic throughput.
Key features include 32 KB Flash, 2 KB RAM, 256 B EEPROM, up to 64 MHz CPU clock (16 MIPS), 12-bit ADC2, DMA, Configurable Logic Cells (CLC), Complementary Waveform Generator (CWG), numerically controlled oscillator (NCO), and four 16-bit timers. Peripherals communicate via Peripheral Pin Select (PPS), dramatically simplifying PCB routing. The vectored interrupt controller with hardware assist reduces latency for time-critical events.
Typical applications include industrial control panels, sensor signal conditioning, motor control with FOC support, IoT edge nodes, smart energy metering, automotive body modules, and human-machine interface (HMI) boards. Designers use the device when they need on-chip analog conditioning alongside an 8-bit control plane without adding an external DSP or ASIC.
Designers should enable the ICD pins (PGC/PGD) on every prototype board to keep the ICSP programming/debug path open; also provide a bulk decoupling cap within 10 mm of the VDD pins and use PPS routing to avoid pinout conflicts. The XLP sleep modes can drop quiescent current to the low nA range when battery life dominates the BOM.
This page consolidates distributor pricing, drop-in pin-compatible variants, and PCB-level design considerations that are not always visible on a single manufacturer product page or distributor listing.
Drop-in alternatives for PIC18F45K42-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 PIC18F45K42-I/PT (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Timers, Comparators.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesPIC18F45K42-I/PT Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data RAM | 2 KB |
| Data EEPROM | 256 B |
| Maximum CPU Frequency | 64 MHz (16 MIPS) |
| Operating Voltage Range | 2.3 V to 5.5 V |
| ADC | 12-bit ADC2 with Computation |
| DAC | 8-bit DAC |
| Comparators | On-chip (multiple) |
| Timers | Four 16-bit Timer/Counter modules |
| DMA Channels | Multiple DMA-capable peripherals |
| PWM | Multiple PWM outputs |
| Operating Temperature | -40C to +85C (Industrial, -I suffix) |
| Package | 44-pin TQFP (10x10 mm), /PT suffix |
| Mounting Type | Surface Mount (Tray) |
| ICSP/ICD | In-Circuit Serial Programming and Debug |
| Peripheral Pin Select | Yes (PPS remappable I/O) |
| Low-Power Mode | XLP eXtreme Low Power, Sleep/DOZE/IDLE |
| RoHS Status | Compliant |
PIC18F45K42-I/PT Pin Configuration
| Pin 1 | RA0/AN0 — Analog input 0 / GPIO |
| Pin 2 | RA1/AN1 — Analog input 1 / GPIO |
| Pin 3 | RA2/AN2 — Analog input 2 / GPIO |
| Pin 4 | RA3/AN3 — Analog input 3 / GPIO |
| Pin 5 | RA4/AN4 — Analog input 4 / GPIO |
| Pin 6 | RA5/AN5 — Analog input 5 / GPIO |
| Pin 7 | RA6 — GPIO |
| Pin 8 | RA7 — GPIO |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply |
| Pin 11 | RB0/AN12 — Analog input 12 / GPIO / INT0 |
| Pin 12 | RB1/AN10 — Analog input 10 / GPIO |
| Pin 13 | RB2/AN8 — Analog input 8 / GPIO |
| Pin 14 | RB3/AN9 — Analog input 9 / GPIO |
| Pin 15 | RB4/AN11 — Analog input 11 / GPIO |
| Pin 16 | RB5/AN13 — Analog input 13 / GPIO |
| Pin 17 | RB6/PGC — ICSP clock / GPIO |
| Pin 18 | RB7/PGD — ICSP data / GPIO |
| Pin 19 | RC0 — GPIO |
| Pin 20 | RC1 — GPIO |
| Pin 21 | RC2 — GPIO |
| Pin 22 | RC3 — GPIO / SCL |
| Pin 23 | RC4 — GPIO / SDA |
| Pin 24 | RC5 — GPIO |
| Pin 25 | RC6 — GPIO / UART TX |
| Pin 26 | RC7 — GPIO / UART RX |
| Pin 27 | RD0 — GPIO |
| Pin 28 | RD1 — GPIO |
| Pin 29 | RD2 — GPIO |
| Pin 30 | RD3 — GPIO |
| Pin 31 | RD4 — GPIO |
| Pin 32 | RD5 — GPIO |
| Pin 33 | RD6 — GPIO |
| Pin 34 | RD7 — GPIO |
| Pin 35 | RE0 — GPIO |
| Pin 36 | RE1 — GPIO |
| Pin 37 | RE2 — GPIO |
| Pin 38 | RE3 — GPIO |
| Pin 39 | VSS — Ground reference |
| Pin 40 | VDD — Positive supply |
| Pin 41 | RF0 — GPIO |
| Pin 42 | RF1 — GPIO |
| Pin 43 | RF2 — GPIO |
| Pin 44 | MCLR — Master clear / reset (active low) |
Typical Applications
PIC18F45K42-I/PT is suitable for 6 applications: Industrial Sensor Signal Conditioning, HMI Control Boards, Smart Energy Metering, Motor Control (BLDC / Stepper), Automotive Body Electronics, IoT Edge Sensor Nodes.
Industrial Sensor Signal Conditioning
The PIC18F45K42-I/PT fits industrial sensor conditioning because its 12-bit ADC2 with Computation performs averaging and threshold checks offloaded from the CPU, while the on-chip op amps and comparators form analog front-end stages directly. The XLP sleep modes drop quiescent current into the nA range between readings, critical for wireless sensor nodes that wake briefly to sample then return to sleep. The 2 KB RAM and 32 KB Flash hold calibration tables and small protocol stacks like Modbus RTU. Engineers benefit from Peripheral Pin Select (PPS) which lets them route ADC and PWM to any available pin, simplifying board layout when sensors and actuators must occupy specific connector positions. Trade-off: 8-bit throughput means DSP-style filtering must run in firmware or hardware peripherals (CLC).
Recommended
HMI Control Boards
The PIC18F45K42-I/PT drives HMI panels with its 8-bit PIC18 core and PWM channels, generating backlight dimming, buzzer tones, and keypad scanning without external logic. The CWG module produces complementary drive signals for power switches, while the 12-bit ADC reads potentiometers and touch sensors with hardware averaging. The 44-TQFP provides enough I/O for 4x4 key matrices plus LCD drive, all while Peripheral Pin Select (PPS) lets engineers re-route UART and SPI when the layout changes. Compared to 32-bit alternatives, the K42 delivers deterministic interrupt response and lower BOM cost for cost-sensitive HMI appliances, with XLP sleep extending battery life in remote controls.
Recommended
Smart Energy Metering
For smart electricity and water meters, the PIC18F45K42-I/PT provides a 12-bit ADC2 with hardware accumulation that precisely samples current/voltage CT and shunt outputs, while DMA moves ADC results into RAM without CPU cycles. The NCO generates precise timing references for line-frequency metering, and the 32 KB Flash holds metering firmware plus calibration data in 256 B EEPROM. Industrial temperature rating (-40C to +85C) covers outdoor meter enclosures, and the XLP deep-sleep current enables multi-year battery life for AMR/AMI endpoints. Engineers designing single-phase meters benefit from CLC cells implementing zero-cross detection in hardware, eliminating external logic ICs.
Recommended
Motor Control (BLDC / Stepper)
The PIC18F45K42-I/PT targets BLDC and stepper motor control with multiple PWM channels and Complementary Waveform Generator (CWG) producing dead-band insertion. The CLC cells implement Hall-sensor decoding in hardware, offloading the 8-bit CPU from real-time commutation, while the 12-bit ADC2 reads back EMF and current sense. With 64 MHz CPU and 16 MIPS throughput, the K42 handles 6-step trapezoidal commutation; field-oriented control (FOC) requires firmware optimization. PPS re-routing is valuable when PCB space forces MOSFET drivers to non-adjacent pins. Trade-off: choose K42 for sub-1 kW motors; larger 32-bit MCUs are better for high-FPS FOC loops.
Recommended
Automotive Body Electronics
The PIC18F45K42-I/PT operates at -40C to +125C junction (industrial -I variant, -40C to +85C ambient) and integrates LIN-capable UART plus PWM and ADC for body modules controlling mirrors, seat heaters, and interior lighting. Note that the -I suffix denotes industrial temp range; for full AEC-Q100 automotive qualification, designers select PIC18F45K42-E/PT or PIC18F45K42 automotive parts. The 44-TQFP offers enough I/O for switch-scanning matrices, while DMA offloads UART receive buffering. The CLC cells implement debounce and edge detection in hardware, reducing firmware burden. XLP sleep modes support quiescent current targets for always-on body networks under 100 uA.
Recommended
IoT Edge Sensor Nodes
For battery-powered IoT sensors reporting via UART-WiFi or LoRa modules, the PIC18F45K42-I/PT provides XLP sleep current in the nA range and a fast wake-up from sleep on interrupts. The 12-bit ADC2 reads sensor outputs with hardware averaging and threshold comparison, generating wake-up events without CPU intervention. The 256-byte EEPROM stores network credentials and calibration, while 32 KB Flash holds small MQTT-SN or proprietary protocol stacks. PPS simplifies routing the SPI/UART to wireless modules regardless of PCB constraints. Compared to 32-bit Cortex-M0 alternatives, the K42 typically delivers lower sleep current and lower BOM cost at the cost of CPU throughput.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F45K42-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F45K42-I/P | PIC18F45K42-I/MV | PIC18F45K40T-I/PT | PIC18F45K42-E/PT |
|---|---|---|---|---|---|
| Package | TQFP-44 (PT) | PDIP-40 (P) | UQFN-40 (MV) | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | |
| Flash Memory | 32 KB | 32 KB | 16 KB | 32 KB | |
| RAM | 2 KB | 2 KB | 1 KB | 2 KB | |
| EEPROM | 256 B | 256 B | 256 B | 256 B | |
| Maximum Clock | 64 MHz | 64 MHz | 64 MHz | 64 MHz | |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +125C (Extended) | |
| Pin Count | 44 | 40 | 44 | 44 | |
| Mounting Type | Surface Mount | Through-Hole | Surface Mount | Surface Mount |
Key Differentiators
- Core-Independent Peripherals (CIPs) offload CPU (vs PIC18F45K22-I/PT)
- Industrial temperature rating vs commercial variants (vs PIC18F45K42-E/PT)
- 44-pin TQFP offers the most I/O in the K42 family (vs PIC18F45K42-I/P)
Design Notes
The PIC18F45K42-I/PT operates from 2.3V to 5.5V, allowing direct connection to both 3.3V and 5V rails. Place a 100 nF decoupling capacitor within 10 mm of each VDD pin pair and a 10 uF bulk capacitor near the MCU; XLP sleep current drops to low-nA levels when peripherals are disabled, so minimize active peripherals during sleep to maximize battery life.
The MCLR pin must not be left floating - tie through a 10 kohm pull-up to VDD for normal operation, or directly to VDD if reset is not required. The ICSP PGC/PGD pins (RB6/RB7) should be reserved on every prototype board to retain the ICSP programming and debug path; populating RB6/RB7 with low-impedance loads will interfere with in-circuit debug.
Use Peripheral Pin Select (PPS) to remap UART, SPI, and PWM signals to convenient PCB positions, but remember that PPS must be unlocked via the CFGCON register sequence before each change. Analog inputs should be routed away from high-frequency digital lines to preserve ADC2 SNR; use a ground pour under the MCU and keep analog traces short.
Estimated: at 64 MHz CPU and 5.5V VDD with peripherals active, core current is approximately 15-20 mA, yielding 80-110 mW dissipation in the 44-TQFP (theta_JA approximately 50 C/W). The junction-to-ambient rise is 4-5 C above ambient, so thermal management is rarely needed; however, in fully sealed enclosures verify with a thermocouple.
Compliance Information
The -I suffix denotes industrial temperature range -40C to +85C; it is NOT AEC-Q100 qualified. For AEC-Q100 automotive designs, select the automotive part number or the -E (extended) variant where applicable. RoHS and lead-free confirmed by Microchip product page.
