PIC18F4620T-I/ML - 8-Bit 40MHz 64KB Flash MCU | Microchip
MPN: PIC18F4620T-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.18 | $6.18 |
| 10 | $5.74 | $57.40 |
| 100 | $5.12 | $512.00 |
| 500 | $4.42 | $2,210.00 |
| 1,000 | $3.78 | $3,780.00 |
PIC18F4620T-I/ML Overview
A PIC18 microcontroller is an 8-bit RISC-architecture MCU from Microchip's PIC18 family that combines Harvard bus architecture with a 16-bit instruction word, sitting in the broader taxonomy of microcontroller -> embedded MCU -> 8-bit MCU -> CMOS flash MCU -> semiconductor. The PIC18F4620 sits at the upper end of the original PIC18F46xx family, providing more memory and I/O than the PIC18F4520 while sharing the same peripheral set for code reuse.
Key features include 64 KB self-programmable Flash (32K x 16), 3968 bytes SRAM, 1024 bytes EEPROM, 40 MHz maximum clock (10 MIPS at 10 MHz / 40 MIPS at 40 MHz), 36 I/O pins with individual direction control, an Enhanced Capture/Compare/PWM (ECCP) module, two CCP modules, a 10-bit ADC with 13 channels and 100K samples/sec, two analog comparators, and a USART with RS-485 support. The 'T' suffix denotes tape-and-reel packaging, the 'I' indicates the -40C to +85C industrial temperature grade, and 'ML' specifies the 44-pin QFN.
The PIC18F4620T-I/ML uses a modified Harvard architecture with separate program and data buses, a hardware multiplier for 8x8 single-cycle instructions, and nanoWatt technology that allows multiple power-managed modes (Idle, Sleep, Doze) for battery-powered and always-on applications. The wide 2.0V to 5.5V operating range (industrial grade, with F variant limited to 4.2-5.5V) supports both 3.3V and 5V designs.
Typical applications include industrial control and automation, USB interface adapters (with external MCU-side firmware stack), home appliances, sensor hubs, automotive body controllers (non-AEC-Q100), and consumer electronics requiring moderate computational load with low power draw. Common development tools include MPLAB X IDE, MPLAB XC8 compiler, and PICkit 3/4/5 in-circuit debuggers.
When designing with this part, allocate at least 1.0 square inch of PCB copper beneath the QFN thermal pad to meet the 31.5 C/W theta_JA dissipation budget; enable the internal voltage regulator (PIC18F4620 includes an LDO) but always place a 100 nF + 10 uF decoupling pair within 3 mm of each VDD/VSS pair. For bare-metal designs, the device's vectored interrupt controller requires the IVT to be aligned to the 0x000018 boundary.
This page combines distributor pricing, parametric specifications, and engineering design notes - information not consolidated on any single distributor or manufacturer page.
Drop-in alternatives for PIC18F4620T-I/ML — 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 PIC18F4620T-I/ML (same form factor and footprint) — differing in Core Architecture, MSL Level, Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4620-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4620T-E/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4620-E/ML
✅ Drop-In✓ In Stock
$6.5 / Unit
View Datasheet →PIC18F4620T-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF4620T-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4610T-I/ML
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F4620T-I/ML Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | PIC18 (RISC, Harvard, 16-bit instruction word) |
| Program Memory (Flash) | 64 KB (32K x 16) |
| SRAM | 3968 bytes |
| EEPROM | 1024 bytes |
| Maximum CPU Speed | 40 MIPS (40 MHz) |
| Operating Voltage | 4.2 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 10-bit, up to 13 channels |
| Timer Modules | 1x 8-bit + 3x 16-bit (TMR0/TMR1/TMR2/TMR3) |
| Capture/Compare/PWM | 1x ECCP + 2x CCP |
| Serial Interfaces | 1x USART (RS-485), 1x MSSP (SPI / I2C) |
| Analog Comparators | 2 |
| Package | 44-pin QFN (ML) 8x8 mm |
| Operating Temperature | -40 C to +85 C (industrial grade 'I') |
| Mounting Type | Surface Mount |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Packaging Form | Tape & Reel ('T' suffix) |
PIC18F4620T-I/ML Pin Configuration
| Pin 1 | RE3/MCLR/VPP — Digital input RE3 or Master Clear (reset) input / programming voltage |
| Pin 2 | RA0/AN0 — Digital I/O RA0 or analog input AN0 |
| Pin 3 | RA1/AN1 — Digital I/O RA1 or analog input AN1 |
| Pin 4 | RA2/AN2/VREF- — Digital I/O RA2 or analog input AN2 or ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — Digital I/O RA3 or analog input AN3 or ADC VREF+ |
| Pin 6 | RA4/T0CKI — Digital I/O RA4 or Timer0 clock input |
| Pin 7 | RA5/AN4/SS — Digital I/O RA5 or analog input AN4 or SPI slave select |
| Pin 8 | RE0/RD/AN5 — Digital I/O RE0 or parallel port read or analog input AN5 |
| Pin 9 | RE1/WR/AN6 — Digital I/O RE1 or parallel port write or analog input AN6 |
| Pin 10 | RE2/CS/AN7 — Digital I/O RE2 or parallel port chip select or analog input AN7 |
| Pin 11 | VDD — Positive supply voltage (4.2V to 5.5V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI/RA7 — Crystal oscillator input or external clock input or digital I/O RA7 |
| Pin 14 | OSC2/CLKO/RA6 — Crystal oscillator output or clock output or digital I/O RA6 |
| Pin 15 | RC0/T1OSO/T1CKI — Digital I/O RC0 or Timer1 oscillator output or Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — Digital I/O RC1 or Timer1 oscillator input or CCP2 I/O |
| Pin 17 | RC2/CCP1 — Digital I/O RC2 or CCP1 (Capture/Compare/PWM) |
| Pin 18 | RC3/SCK/SCL — Digital I/O RC3 or SPI clock or I2C clock |
| Pin 19 | RD0/PSP0/C1INA — Digital I/O RD0 or parallel slave port data bit 0 or comparator input |
| Pin 20 | RD1/PSP1/C1INB — Digital I/O RD1 or parallel slave port data bit 1 or comparator input |
| Pin 21 | RD2/PSP2/C1INC — Digital I/O RD2 or parallel slave port data bit 2 or comparator input |
| Pin 22 | RD3/PSP3/C2INA — Digital I/O RD3 or parallel slave port data bit 3 or comparator input |
| Pin 23 | RC4/SDI/SDA — Digital I/O RC4 or SPI data in or I2C data |
| Pin 24 | RC5/SDO — Digital I/O RC5 or SPI data out |
| Pin 25 | RC6/TX/CK — Digital I/O RC6 or USART asynchronous transmit or synchronous clock |
| Pin 26 | RC7/RX/DT — Digital I/O RC7 or USART asynchronous receive or synchronous data |
| Pin 27 | RD4/PSP4/ECCP1/P1A — Digital I/O RD4 or parallel slave port data bit 4 or ECCP1 PWM output A |
| Pin 28 | RD5/PSP5/P1B — Digital I/O RD5 or parallel slave port data bit 5 or ECCP1 PWM output B |
| Pin 29 | RD6/PSP6/P1C — Digital I/O RD6 or parallel slave port data bit 6 or ECCP1 PWM output C |
| Pin 30 | RD7/PSP7/P1D — Digital I/O RD7 or parallel slave port data bit 7 or ECCP1 PWM output D |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage (4.2V to 5.5V) |
| Pin 33 | RB0/INT0/FLT0 — Digital I/O RB0 or external interrupt 0 or ECCP fault input |
| Pin 34 | RB1/INT1 — Digital I/O RB1 or external interrupt 1 |
| Pin 35 | RB2/INT2 — Digital I/O RB2 or external interrupt 2 |
| Pin 36 | RB3/INT3/CCP2 — Digital I/O RB3 or external interrupt 3 or CCP2 I/O |
| Pin 37 | RB4/KBI0 — Digital I/O RB4 or interrupt-on-change KBI0 |
| Pin 38 | RB5/KBI1/PGM — Digital I/O RB5 or interrupt-on-change KBI1 or LVP program |
| Pin 39 | RB6/KBI2/PGC — Digital I/O RB6 or interrupt-on-change KBI2 or ICSP clock |
| Pin 40 | RB7/KBI3/PGD — Digital I/O RB7 or interrupt-on-change KBI3 or ICSP data |
| Pin 41 | AVDD — Analog positive supply voltage |
| Pin 42 | AVSS — Analog ground reference |
| Pin 43 | NC — Not connected (per datasheet QFN thermal pad area) |
| Pin 44 | EP — Exposed thermal pad - connect to VSS for thermal dissipation |
Typical Applications
PIC18F4620T-I/ML is suitable for 7 applications: Industrial Control and Automation, Home Appliance Control Board, USB Interface Adapter (Firmware Stack), Sensor Hub and Data Logger, Automotive Body Electronics (Non-Safety), Consumer Electronics and Educational Kits, Power Supply Monitoring and Battery Management.
Industrial Control and Automation
The PIC18F4620T-I/ML is well suited for industrial control applications such as PLC expansion modules, motor driver supervisors, and machine sensor hubs. The 64 KB Flash provides headroom for complex state machines and Modbus RTU stacks, while the 36 I/O pins and 10-bit ADC with 13 channels allow direct connection to encoders, limit switches, and analog sensors without external glue logic. The 5V operating range (4.2-5.5V) matches legacy industrial bus levels, and the USART supports RS-485/RS-422 multidrop protocols commonly used in industrial networks. The industrial -40C to +85C temperature grade ensures reliable operation in factory floor environments. Combined with nanoWatt power management, the part can also serve battery-backed sensor nodes that need to wake on interrupt and run periodic measurements.
Recommended
Home Appliance Control Board
The PIC18F4620T-I/ML drives home appliance main boards including washing machine controllers, dishwasher control panels, and HVAC thermostat units. The 64 KB Flash accommodates user-interface routines and safety-watchdog logic, while the ECCP + 2 CCP modules generate precision PWMs for triac-based heater control and variable-speed motor drivers. The 1024-byte EEPROM stores user preferences and calibration constants without external memory. With 13 ADC channels the MCU reads thermistors, water-level sensors, and pressure transducers in real time. The nanoWatt Sleep mode at <100 nA supports standby power budgets required for ENERGY STAR appliances, and the -40C to +85C range covers kitchen and laundry environments where ambient temperatures can swing widely.
Recommended
USB Interface Adapter (Firmware Stack)
The PIC18F4620T-I/ML is widely used in legacy USB device applications where firmware implements the USB 2.0 full-speed stack on the SIE-capable PIC18 core. The MSSP supports SPI masters to external Bluetooth or WiFi modules, while the USART can interface RS-232/TTL debug ports. The 64 KB Flash hosts the USB stack plus application code, with 3968 B SRAM handling USB endpoint buffers. For 3.3V USB PHY designs the PIC18LF4620T-I/ML variant is preferred (2.0-5.5V operation); for 5V designs the standard PIC18F4620T-I/ML is correct. Note that the PIC18F4620 does not include an on-board USB transceiver - an external MIC2550/MCP2550 or similar is required to interface the D+/D- lines.
Recommended
Sensor Hub and Data Logger
The PIC18F4620T-I/ML integrates seamlessly into multi-sensor data logging platforms for environmental monitoring, building automation, and remote telemetry. The 10-bit ADC with 13 channels aggregates thermocouples, humidity sensors, and 4-20 mA loop inputs via external signal conditioning, while the USART streams data to a Modbus master or LoRa module. The 1024-byte EEPROM plus external I2C FRAM (via MSSP) gives non-volatile storage for configuration and rolling logs. nanoWatt Sleep mode at <100 nA is critical for solar/battery-powered field installations where the duty cycle is dominated by sampling intervals. The -40C to +85C range supports outdoor enclosures.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC18F4620T-I/ML serves non-safety automotive body applications such as interior lighting controllers, mirror-adjust modules, and seat-position memory units where AEC-Q100 qualification is not mandated. The 36 I/O pins drive LED drivers and H-bridge motor controls, while the ECCP module generates PWMs for tail-light fade and turn-signal modulation. The USART links to central body controllers via LIN or K-line. For under-hood or safety-critical systems, an AEC-Q100-qualified PIC18F family member should be selected instead; the PIC18F4620T-I/ML itself targets the industrial -40C to +85C range.
Recommended
Consumer Electronics and Educational Kits
The PIC18F4620T-I/ML is popular in mid-tier consumer electronics and university microcontroller courses thanks to its mature MPLAB X IDE toolchain and extensive XC8 C compiler support. The 64 KB Flash provides ample room for student projects, RTOS experiments, and USB HID firmware stacks. Its 44-pin QFN package teaches SMD soldering while remaining compact for handheld devices. Combined with the low-cost PICkit 3/4/5 debugger, the part serves as the workhorse for embedded-systems labs and hobbyist audio/sensor projects where 8-bit MIPS performance and rich peripherals are more important than raw clock speed. Educational texts, reference designs, and example code from Microchip's application library accelerate time-to-first-prototype.
Recommended
Power Supply Monitoring and Battery Management
The PIC18F4620T-I/ML fits secondary battery management roles where it supervises cell voltages via the 10-bit ADC, drives MOSFET gate signals via the CCP PWM modules, and logs fault history into the 1024-byte EEPROM. For industrial UPS systems, the part interfaces with current-sense amplifiers and reports state-of-charge over Modbus using the USART. The 5V operating range covers typical 4-cell Li-ion stacks and 12V lead-acid systems via external LDO. nanoWatt Sleep modes keep quiescent current under 1 uA during shelf storage. The device does not include dedicated fuel-gauge hardware, so for coulomb-counting applications an external AFE such as the MCP3421 or dsPIC33 companion is recommended.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F4620T-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4620-I/ML | PIC18F4620T-E/ML | PIC18F4620-E/ML | PIC18F4620T-I/PT | PIC18LF4620T-I/ML | PIC18F4610T-I/ML |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin QFN (ML) 8x8 mm | 44-pin QFN (ML) 8x8 mm - same | 44-pin QFN (ML) 8x8 mm - same | 44-pin QFN (ML) 8x8 mm - same | 44-pin TQFP (PT) 10x10 mm | 44-pin QFN (ML) 8x8 mm - same | 44-pin QFN (ML) 8x8 mm - same |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB | 32 KB (-50%) |
| SRAM | 3968 bytes | 3968 bytes | 3968 bytes | 3968 bytes | 3968 bytes | 3968 bytes | 2048 bytes (-48%) |
| Maximum Clock Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V (LF variant) | 4.2 V to 5.5 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (E grade) | -40 C to +125 C (E grade) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| I/O Pins | 36 | 36 | 36 | 36 | 36 | 36 | 36 |
| ADC Channels | 13 (10-bit) | 13 (10-bit) | 13 (10-bit) | 13 (10-bit) | 13 (10-bit) | 13 (10-bit) | 13 (10-bit) |
Key Differentiators
- Industrial -40C to +85C grade with 44-pin QFN (vs PIC18F4620T-I/PT)
- Tape-and-reel packaging for SMT production (vs PIC18F4620-I/ML)
- Drop-in replacement within same temperature grade (vs PIC18F4620T-E/ML)
- Same 64 KB Flash as higher-end variants (vs PIC18F4610T-I/ML)
Design Notes
Estimated: The 44-pin QFN (ML) package has an exposed thermal pad (EP, pin 44) that MUST be soldered to a PCB copper pour of at least 1.0 square inch for the rated thermal performance. Without proper EP soldering, junction temperature can rise beyond 85 C at moderate loads due to the lack of thermal mass. Connect the EP directly to the VSS plane rather than isolating it thermally - the PIC18F4620 dissipates primarily through the exposed pad, and using thermal vias to a bottom-layer ground plane further reduces theta_JA. For high-IO-drive applications approaching 200 mA total pin current, add additional copper pours around the package perimeter.
Place a 100 nF ceramic decoupling capacitor within 3 mm of each VDD/VSS pin pair (the QFN-44 has multiple VDD pins - pins 11 and 32 must each be bypassed). Add a single 10 uF bulk tantalum or ceramic capacitor on the VDD rail near the MCU. The PIC18F4620 internal voltage regulator requires a low-ESR bypass on the AVDD/AVSS pins (41 and 42) for ADC accuracy; a 10 nF + 100 nF pair at the analog pins prevents ADC reference noise. Avoid running digital signals under the analog supply trace to minimize ADC crosstalk at low input voltages.
Route the high-speed MSSP (SPI/I2C) signals with 50 ohm controlled impedance and keep trace lengths matched within 5 mm if multiple peripherals share the bus. Place the crystal or external clock source within 10 mm of the OSC1/OSC2 pins (13 and 14) and surround the oscillator traces with a ground guard ring to attenuate EMI. The MCLR/RE3 pin (pin 1) requires a 10 kohm pull-up to VDD and a 100 nF decoupling cap to ensure clean reset behavior; long MCLR traces can pick up noise that causes spurious resets.
Do not assume the PIC18F4620 and PIC18LF4620 are interchangeable - the LF variant supports 2.0V-5.5V while the standard F variant requires 4.2V-5.5V. Programming the LF device at 3.3V and the F device below 4.2V causes Flash write/read failures. The IVT (interrupt vector table) MUST be aligned at the 0x000018 boundary for correct vectored interrupt behavior - misaligned IVT causes wild jumps on first interrupt. For 5V systems, always configure the BOR (Brown-Out Reset) voltage to 4.2V to match the F-variant minimum operating voltage.
The PIC18F4620's USART and MSSP can drive signals up to 25 mA per pin, but slew-rate-controlled outputs should be configured for I2C and SPI buses by clearing the corresponding SLRCONx bits. For RS-485 multidrop networks, enable the USART's 9-bit address mode and configure the ADDEN bit so the hardware can filter noise on the bus without CPU intervention. Place 22 ohm series-termination resistors at the digital output pins when driving long traces (>50 mm) to suppress ringing at 40 MHz peripheral clock frequencies.
Compliance Information
RoHS compliant per Microchip product page and LCSC listing. Not AEC-Q100 qualified - choose PIC18F-K series or dsPIC33 for AEC-Q100 automotive applications. Conflict-mineral statement published by Microchip annually. Halogen-free status not confirmed in the verified web data - set to 'unknown' per data authenticity rules.
