PIC18F45K40T-I/PT - 32KB Flash 8-bit MCU 44-TQFP | Microchip
MPN: PIC18F45K40T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.74 | $27.40 |
| 100 | $2.45 | $245.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.92 | $1,920.00 |
| 1,600 | $1.78 | $2,848.00 |
PIC18F45K40T-I/PT Overview
An 8-bit PIC microcontroller (MCU) is a single-chip computer based on Microchip's PIC (Peripheral Interface Controller) RISC architecture, integrating a CPU core, Flash program memory, SRAM, EEPROM data memory, and a rich set of peripherals including ADC, timers, PWM, communication interfaces (UART/SPI/I2C), and Core Independent Peripherals (CIPs). Within the broader taxonomy, the PIC18F family sits at the high-end of Microchip's 8-bit line, providing 16-bit instruction word, linear memory model, and C-optimized architecture suitable for moderately complex embedded applications requiring deterministic real-time control.
Key features include 36 digital I/O pins, 35 instructions with 200ns minimum instruction cycle at 64MHz, integrated 10-bit ADC with up to 35 channels, 5-bit DAC, up to 4 CCP/ECCP modules, CWG (Complementary Waveform Generator), HLT (Hardware Limit Timer), WWDT (Windowed Watchdog Timer), and SCAN/CRC for functional safety. Core Independent Peripherals such as CWG, NCO, and DSM operate without CPU intervention, offloading waveform synthesis and signal processing tasks.
The PIC18F45K40 employs Microchip's enhanced mid-range core with hardware multiplier and 32-level stack, enabling C compilers to generate efficient code. The wide 2.5V-5.5V VDD range supports both 3.3V and 5V designs, while XLP technology provides ultra-low sleep currents in the nanoamp range for energy-harvesting and battery-backed applications. Peripheral Pin Select (PPS) allows flexible remapping of digital functions to physical pins, simplifying PCB layout.
Typical applications include industrial control and HMI panels, home appliance controls, IoT edge sensor nodes, automotive body electronics, low-power remote sensors, USB peripherals (with on-chip USB on related variants), and consumer electronics requiring touch/proximity sensing. The combination of 5V tolerance and rich analog peripherals makes it particularly well-suited to sensor conditioning, motor control loops, and lighting control.
When designing with this part, ensure the MCLR reset circuit follows Microchip's recommended RC time constant, and place decoupling capacitors (100nF + 10uF bulk) within 5mm of VDD/AVDD pins. The PPS feature must be configured in firmware before peripheral use; software teams should budget initialization time accordingly.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on a single manufacturer or distributor page, enabling engineers to evaluate PIC18F45K40T-I/PT fit for their design in one place.
Drop-in alternatives for PIC18F45K40T-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 PIC18F45K40T-I/PT (same form factor and footprint) — differing in ADC, Comparators, Package, Program Memory (Flash), Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F45K22-I/PT
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →PIC18F45K20-I/PT
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →PIC18F46K40-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F45K40-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4580-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F45K22-E/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F45K40T-I/PT Maximum Ratings & Electrical Characteristics
| No specifications available |
PIC18F45K40T-I/PT Pin Configuration
| Pin 1 | RA0/AN0/C1IN0-/C2IN0-/DACOUT — PORTA bit 0, analog input 0, comparator input, DAC output |
| Pin 2 | RA1/AN1/C1IN1-/C2IN1- — PORTA bit 1, analog input 1, comparator input |
| Pin 3 | RA2/AN2/C1IN0+/C2IN0+ — PORTA bit 2, analog input 2, comparator non-inverting input |
| Pin 4 | RA3/AN3/C1IN1+ — PORTA bit 3, analog input 3, comparator non-inverting input |
| Pin 5 | RA4/AN4/C1OUT — PORTA bit 4, analog input 4, comparator 1 output |
| Pin 6 | RA5/AN5/C2OUT — PORTA bit 5, analog input 5, comparator 2 output |
| Pin 7 | RA6/OSC2/CLKOUT — PORTA bit 6, oscillator output, clock out |
| Pin 8 | RA7/OSC1/CLKIN — PORTA bit 7, oscillator input, clock in |
| Pin 9 | RE3/MCLR/VPP — PORTE bit 3, Master Clear reset, programming voltage |
| Pin 10 | VDD — Positive supply voltage (2.5V-5.5V) |
| Pin 11 | VSS — Ground reference |
| Pin 12 | RB0/AN12/C2IN3-/FLT0/INT0 — PORTB bit 0, analog input 12, comparator input, fault input, external interrupt 0 |
| Pin 13 | RB1/AN10/C1IN3-/PWM4 — PORTB bit 1, analog input 10, comparator input, PWM4 output |
| Pin 14 | RB2/AN8/C1IN2-/PWM3 — PORTB bit 2, analog input 8, comparator input, PWM3 output |
| Pin 15 | RB3/AN9/C1IN1+/PWM2 — PORTB bit 3, analog input 9, comparator input, PWM2 output |
| Pin 16 | RB4/AN11/C2IN1+/PWM1 — PORTB bit 4, analog input 11, comparator input, PWM1 output |
| Pin 17 | RB5/AN13/C2IN2-/CCP3 — PORTB bit 5, analog input 13, comparator input, CCP3 output |
| Pin 18 | RB6/ICSPCLK — PORTB bit 6, In-Circuit Serial Programming clock |
| Pin 19 | RB7/ICSPDAT — PORTB bit 7, In-Circuit Serial Programming data |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply voltage (2.5V-5.5V) |
| Pin 22 | RC0/PWM4 — PORTC bit 0, PWM4 output (PPS alternate) |
| Pin 23 | RC1/CCP2 — PORTC bit 1, CCP2 output |
| 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, UART TX, clock |
| Pin 29 | RC7/RX/DT — PORTC bit 7, UART RX, data |
| Pin 30 | RD0 — PORTD bit 0 |
| Pin 31 | RD1 — PORTD bit 1 |
| Pin 32 | RD2 — PORTD bit 2 |
| Pin 33 | RD3 — PORTD bit 3 |
| Pin 34 | RD4 — PORTD bit 4 |
| Pin 35 | RD5 — PORTD bit 5 |
| Pin 36 | RD6 — PORTD bit 6 |
| Pin 37 | RD7 — PORTD bit 7 |
| Pin 38 | VSS — Ground reference |
| Pin 39 | VDD — Positive supply voltage (2.5V-5.5V) |
| Pin 40 | RE0 — PORTE bit 0 |
| Pin 41 | RE1 — PORTE bit 1 |
| Pin 42 | RE2 — PORTE bit 2 |
| Pin 43 | AVDD — Analog positive supply |
| Pin 44 | AVSS — Analog ground reference |
Typical Applications
PIC18F45K40T-I/PT is suitable for 6 applications: Industrial Control and HMI Panels, Home Appliance Control Boards, Battery-Powered IoT Sensor Nodes, Automotive Body Electronics, Low-Power Remote Sensor Hubs, Lighting Control Systems.
Industrial Control and HMI Panels
The PIC18F45K40T-I/PT fits industrial HMI and control panels where its 32KB Flash supports Modbus or CANopen protocol stacks, 2KB RAM handles display buffers, and 36 I/O pins drive keypads, LED indicators, and relay outputs. The 2.5V-5.5V range tolerates industrial 24V bus systems after regulation, while integrated CWG generates complementary PWM for power-stage drives without CPU overhead. Real-time response is guaranteed by the 64MHz core and hardware CRC/SCAN peripherals.
Recommended
Home Appliance Control Boards
The PIC18F45K40T-I/PT is a strong fit for home appliance controls (washing machines, dishwashers, refrigerators) where its 10-bit ADC reads temperature/pressure sensors, the 5-bit DAC controls analog references, and the CWG generates motor-driver PWM with hardware dead-band. The wide 2.5V-5.5V range accommodates 5V supply rails common in appliance designs, while XLP sleep modes meet ENERGY STAR standby requirements. Core Independent Peripherals reduce BOM cost by replacing external logic.
Recommended
Battery-Powered IoT Sensor Nodes
The PIC18F45K40T-I/PT's XLP technology delivers nanoamp sleep currents, making it suitable for battery-powered IoT sensor nodes that spend most of their life in deep sleep. Its 32KB Flash fits BLE/Zigbee/LoRaWAN protocol libraries, while the 64MHz active mode provides headroom for sensor-fusion calculations before returning to sleep. The ADC and comparators wake the MCU on sensor threshold events without CPU intervention, extending coin-cell battery life to years.
Recommended
Automotive Body Electronics
The PIC18F45K40T-I/PT serves automotive body electronics (interior lighting, mirror controls, seat modules, HVAC blend doors) where the industrial -40C to +85C range covers cabin environments and the 5V tolerance matches automotive 12V regulated rails. The CWG, ECCP, and 10-bit ADC handle motor drivers, LED dimming, and position feedback. For under-hood AEC-Q100 applications, verify Microchip's automotive-qualified PIC18F variants; the K40 family is widely used in non-safety body controllers.
Recommended
Low-Power Remote Sensor Hubs
The PIC18F45K40T-I/PT fits remote sensor hubs with multiple analog inputs (soil moisture, environmental monitoring, asset tracking) where its 35-channel 10-bit ADC reads sensor arrays sequentially. The XLP deep-sleep mode drops supply current to nanoamps between measurements, and the WWDT ensures system integrity if firmware hangs. UART/SPI/I2C with PPS flexibility connects to LoRa, BLE, or sub-GHz radio modules without remapping the PCB layout.
Recommended
Lighting Control Systems
The PIC18F45K40T-I/PT drives LED lighting controls (architectural dimming, RGB color mixing, DMX-512 fixtures) where its CWG produces high-resolution PWM dimming without CPU intervention, and its 64MHz core executes DMX-512 or DALI protocol stacks in real time. The 36 I/O pins handle multiple LED channels, capacitive touch inputs, and IR receiver interfaces. PPS allows flexible routing of PWM outputs to physical pins, simplifying PCB layout for multi-zone fixtures.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F45K40T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F45K22-I/PT | PIC18F45K20-I/PT | PIC18F46K40-I/PT | PIC18F45K40-I/PT | PIC18F4580-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10mm) | 44-TQFP (10x10mm) - same | 44-TQFP (10x10mm) - same | 44-TQFP (10x10mm) - same | 44-TQFP (10x10mm) - same | 44-TQFP (10x10mm) - same |
| Flash Memory | 32 KB | 8 KB | 32 KB | 64 KB | 32 KB | 32 KB |
| RAM | 2 KB | 768 B | 1.5 KB | 4 KB | 2 KB | 1.5 KB |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Max CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 40 MHz |
| Operating Voltage | 2.5V to 5.5V | 2.5V to 5.5V | 1.8V to 3.6V | 2.5V to 5.5V | 2.5V to 5.5V | 4.2V to 5.5V |
| Core Independent Peripherals (CWG/NCO/DSM) | Yes | No | No | Yes | Yes | No |
| XLP Low Power | Yes | Yes | Yes | Yes | Yes | No |
| Pricing (qty-1, USD) | $2.95 | $2.55 | $2.65 | $3.35 | $2.85 | $3.10 |
Key Differentiators
- Includes CWG, NCO, DSM Core Independent Peripherals (vs PIC18F45K22-I/PT)
- Doubled memory headroom (64KB Flash, 4KB RAM) (vs PIC18F46K40-I/PT)
- XLP nanoWatt technology with deep sleep currents (vs PIC18F4580-I/PT)
Design Notes
Place a 100nF ceramic decoupling capacitor within 5mm of each VDD/VSS pair, and a 10uF bulk tantalum or ceramic on the main VDD pin. The PIC18F45K40's ADC accuracy is sensitive to VDD ripple; add a ferrite bead or LC filter if the 5V rail is shared with motors or relays. AVDD and AVSS pins should be tied to clean analog supplies with separate analog ground pour when sampling sub-millivolt signals.
The MCLR pin (RE3) requires a 10k pull-up to VDD and a 100nF capacitor to ground for proper reset; do not leave it floating. The ICSP pins (RB6/ICSPCLK and RB7/ICSPDAT) must be accessible in production for in-circuit programming. PPS functions are NOT enabled by default - firmware must configure them before peripheral use; budget startup time accordingly. Brown-out Reset (BOR) defaults must be reviewed against application voltage profile.
The 44-pin TQFP package has 0.8mm pitch and requires fine-pitch PCB layout capability. Use a 4-layer stack-up with continuous ground plane for best EMI performance; place the MCU on the top layer with shortest possible traces to decoupling caps. Keep analog signal traces away from switching nodes (PWM outputs, oscillator pins) by at least 3x trace width. The exposed thermal pad (if present) should be soldered to a thermal copper pour connected to digital ground.
Compliance Information
Per Microchip product page and DigiKey listing. Standard industrial temperature grade (-40C to +85C) is not AEC-Q100 qualified; for automotive deployments Microchip offers separately qualified PIC18F variants.
