PIC18F6620T-I/PT - 64KB Flash 8-bit MCU 25MHz 64-TQFP | Microchip
MPN: PIC18F6620T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.32 | $6.32 |
| 10 | $5.85 | $58.50 |
| 100 | $5.21 | $521.00 |
| 500 | $4.69 | $2,345.00 |
| 1,000 | $4.18 | $4,180.00 |
PIC18F6620T-I/PT Overview
An 8-bit flash microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, EEPROM, and a rich set of peripheral interfaces into one package. In the broader product hierarchy, the PIC18F6620 sits within the 8-bit microcontroller category -> RISC microcontroller -> embedded controller -> semiconductor IC. These MCUs are the workhorse of cost-sensitive embedded designs that need deterministic real-time response, low power, and a wide ecosystem of development tools, making them complementary to (rather than competitive with) 32-bit ARM Cortex-M parts.
Key features include 52 digital I/O pins, 12 channels of 10-bit analog-to-digital conversion, two USART modules, one MSSP configurable as SPI or I2C, five capture/compare/PWM peripherals, two 8-bit timers and three 16-bit timers, and self-programming support with ICD (In-Circuit Debugger) capability. The enhanced 16-bit instruction set is fully compatible with the C compiler-friendly PIC18 architecture, enabling rapid firmware development using Microchip's MPLAB X IDE and XC8 toolchain.
Typical applications include industrial control panels, HVAC and building automation, consumer appliance interfaces, automotive body and accessory modules, USB-to-UART bridge controllers, sensor aggregators, and small graphical user-interface boards. The wide 5V supply range makes it a direct fit for noisy industrial buses and for designs migrating from legacy PIC16 designs that need more code space and timers.
When designing with the PIC18F6620, follow Microchip's recommended decoupling (0.1 uF on each VDD pin plus a bulk 10 uF tantalum) and place the ICSP/ICD header footprint so production boards remain in-circuit debuggable. Watch the parallel-slave-port pins if your layout does not need external bus access, since leaving them as I/O consumes only a few bytes of configuration but can simplify PCB routing.
Drop-in alternatives for PIC18F6620T-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 PIC18F6620T-I/PT (same form factor and footprint) — differing in Operating Temperature, Package, Core Architecture, Serial Interfaces, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F6620-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F6620-E/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F6620T-I/PTVAO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F6520-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.1 / Unit
View Datasheet →PIC18F6525T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.4 / Unit
View Datasheet →PIC18F6720-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$21.1 / Unit
View Datasheet →PIC18F6620T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 enhanced 8-bit RISC |
| Program Flash Memory | 64 KB (32K x 16) |
| Data RAM | 3840 bytes |
| Data EEPROM | 1024 bytes |
| Maximum CPU Speed | 25 MHz (40 MHz family rating) |
| MIPS (Peak) | 10 MIPS |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| Digital I/O Pins | 52 |
| Analog-to-Digital Converter | 12 channels x 10-bit |
| Capture/Compare/PWM Modules | 5 |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Serial Interfaces | 2 x USART, 1 x MSSP (SPI / I2C) |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | 64-pin TQFP (PT), 10 x 10 mm |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Programming/Debug | ICSP + ICD (In-Circuit Debugger) |
PIC18F6620T-I/PT Pin Configuration
| Pin 1 | RC2/CCP1 — I/O port C bit 2 / CCP1 PWM output |
| Pin 2 | RC3/SCL — I/O port C bit 3 / I2C clock (MSSP) |
| Pin 3 | RC4/SDA — I/O port C bit 4 / I2C data (MSSP) |
| Pin 4 | RC5 — I/O port C bit 5 |
| Pin 5 | RC6/TX1 — I/O port C bit 6 / USART1 TX |
| Pin 6 | RC7/RX1 — I/O port C bit 7 / USART1 RX |
| Pin 7 | RD0/PSP0 — I/O port D bit 0 / parallel slave port data |
| Pin 8 | RD1/PSP1 — I/O port D bit 1 / parallel slave port data |
| Pin 9 | RD2/PSP2 — I/O port D bit 2 / parallel slave port data |
| Pin 10 | RD3/PSP3 — I/O port D bit 3 / parallel slave port data |
| Pin 11 | RC0 — I/O port C bit 0 |
| Pin 12 | RC1 — I/O port C bit 1 |
| Pin 13 | RB0/INT0 — I/O port B bit 0 / external interrupt 0 |
| Pin 14 | RB1/INT1 — I/O port B bit 1 / external interrupt 1 |
| Pin 15 | RB2/INT2 — I/O port B bit 2 / external interrupt 2 |
| Pin 16 | RB3/CCP2 — I/O port B bit 3 / CCP2 |
| Pin 17 | RB4 — I/O port B bit 4 |
| Pin 18 | RB5/PGM — I/O port B bit 5 / LVP programming |
| Pin 19 | RB6/PGC — I/O port B bit 6 / ICSP clock |
| Pin 20 | RB7/PGD — I/O port B bit 7 / ICSP data |
| Pin 21 | VDD — Positive supply (4.2 V to 5.5 V) |
| Pin 22 | VSS — Ground reference |
| Pin 23 | RA0/AN0 — I/O port A bit 0 / analog input 0 |
| Pin 24 | RA1/AN1 — I/O port A bit 1 / analog input 1 |
| Pin 25 | RA2/AN2 — I/O port A bit 2 / analog input 2 |
| Pin 26 | RA3/AN3 — I/O port A bit 3 / analog input 3 |
| Pin 27 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Pin 28 | RA5/AN4 — I/O port A bit 5 / analog input 4 |
| Pin 29 | RE0/RD — I/O port E bit 0 / parallel slave port read |
| Pin 30 | RE1/WR — I/O port E bit 1 / parallel slave port write |
| Pin 31 | RE2/CS — I/O port E bit 2 / parallel slave port chip select |
| Pin 32 | VDD — Positive supply |
| Pin 33 | VSS — Ground reference |
| Pin 34 | OSC1/CLKI — Crystal oscillator input / external clock in |
| Pin 35 | OSC2/CLKO — Crystal oscillator output / clock out |
| Pin 36 | RC0 — I/O port C bit 0 (second instance on 64-pin) |
| Pin 37 | RC1 — I/O port C bit 1 (second instance on 64-pin) |
| Pin 38 | RD4/PSP4 — I/O port D bit 4 / parallel slave port data |
| Pin 39 | RD5/PSP5 — I/O port D bit 5 / parallel slave port data |
| Pin 40 | RD6/PSP6 — I/O port D bit 6 / parallel slave port data |
| Pin 41 | RD7/PSP7 — I/O port D bit 7 / parallel slave port data |
| Pin 42 | VSS — Ground reference |
| Pin 43 | VDD — Positive supply |
| Pin 44 | RF0 — I/O port F bit 0 |
| Pin 45 | RF1 — I/O port F bit 1 |
| Pin 46 | RF2 — I/O port F bit 2 |
| Pin 47 | RF3 — I/O port F bit 3 |
| Pin 48 | RF4 — I/O port F bit 4 |
| Pin 49 | RF5 — I/O port F bit 5 |
| Pin 50 | RF6 — I/O port F bit 6 |
| Pin 51 | RF7 — I/O port F bit 7 |
| Pin 52 | RG0 — I/O port G bit 0 |
| Pin 53 | RG1 — I/O port G bit 1 |
| Pin 54 | RG2 — I/O port G bit 2 |
| Pin 55 | RG3 — I/O port G bit 3 |
| Pin 56 | RG4 — I/O port G bit 4 |
| Pin 57 | RA6/OSC2 — I/O port A bit 6 / alternate OSC2 |
| Pin 58 | RA7/OSC1 — I/O port A bit 7 / alternate OSC1 |
| Pin 59 | VSS — Ground reference |
| Pin 60 | VDD — Positive supply |
| Pin 61 | RB0 — I/O port B bit 0 (alternate mapping) |
| Pin 62 | RB1 — I/O port B bit 1 (alternate mapping) |
| Pin 63 | RB2 — I/O port B bit 2 (alternate mapping) |
| Pin 64 | RB3 — I/O port B bit 3 (alternate mapping) |
Typical Applications
PIC18F6620T-I/PT is suitable for 6 applications: Industrial Control Panel, HVAC and Building Automation, Consumer Appliance Interface Board, Automotive Body and Accessory Module, USB-to-UART Bridge and Sensor Aggregator, Small Graphical User-Interface (GUI) Board.
Industrial Control Panel
The PIC18F6620T-I/PT is well suited for industrial control panels because it integrates 52 digital I/O pins and 12 channels of 10-bit ADC in a single 64-pin TQFP, allowing direct interface to keypad matrices, LED or LCD status indicators, and 4-20 mA sensor inputs without external glue logic. Its 4.2 V to 5.5 V single supply rides directly on the 5 V industrial backplane, and its 64 KB flash plus 3840 B RAM is enough for state-machine logic, menu handling, and Modbus ASCII/RTU protocols. The ICSP/ICD pins allow in-circuit firmware updates on the production line, while the -40 C to +85 C industrial temperature grade handles factory-floor thermal stress.
Recommended
HVAC and Building Automation
In HVAC and building-automation controllers the PIC18F6620T-I/PT drives multi-zone thermostats, damper actuators, and BACnet or Modbus nodes from a single 5 V rail. The five capture/compare/PWM peripherals generate accurate switching signals for TRIAC-driven fans and variable-speed blowers, while the 12-channel ADC reads thermistor, humidity, and pressure sensors in real time. Self-programming flash enables remote firmware upgrades for installed controllers, and the wide -40 C to +85 C range handles unheated equipment rooms. Compared with discrete logic, this MCU cuts BOM cost and simplifies agency re-certification because only the firmware changes.
Recommended
Consumer Appliance Interface Board
For washing-machine, dishwasher, and induction-cooktop interface boards, the PIC18F6620T-I/PT delivers enough MIPS to scan capacitive touch keys, drive seven-segment or TFT displays, and run motor-control state machines. The MSSP peripheral configures as either SPI (for graphic displays) or I2C (for EEPROM and sensor hubs), while the two USARTs handle diagnostic and Wi-Fi/Bluetooth module links. Its 1024-byte EEPROM stores user preferences and fault logs without external memory, reducing BOM cost. The enhanced PIC18 instruction set keeps the C-code footprint compact, leaving headroom for over-the-air update hooks.
Recommended
Automotive Body and Accessory Module
Body controllers for window lifters, mirror adjusters, seat-position memories, and ambient lighting benefit from the PIC18F6620T-I/PT's 52 I/O pins and five CCP peripherals. The MSSP and USART peripherals connect to LIN bus transceivers or to a central body-domain ECU over CAN. The 12-channel 10-bit ADC reads multiple rheostat position sensors, while the 5 CCPs drive PWMs for LED dimming and motor speed control. Microchip's -40 C to +125 C PIC18F6620-E/PT variant covers under-hood thermal extremes; the standard PIC18F6620T-I/PT handles cabin electronics comfortably.
Recommended
USB-to-UART Bridge and Sensor Aggregator
With its two USART peripherals, the PIC18F6620T-I/PT easily serves as a USB-to-UART bridge, a multi-sensor aggregator, or a small protocol converter between SPI, I2C, and UART domains. The 12-channel ADC and 52 digital I/Os let one MCU gather data from multiple analog and digital sensors and forward the consolidated stream over a single UART or SPI link, simplifying the host firmware. The 64 KB flash accommodates Modbus or proprietary framing stacks, and the 1024-byte EEPROM stores calibration constants and node addresses. The ICSP interface keeps units field-programmable.
Recommended
Small Graphical User-Interface (GUI) Board
The PIC18F6620T-I/PT's 64 KB flash and 3840 B RAM are sufficient for driving a small monochrome or color TFT via SPI, scanning a matrix keypad, and running a lightweight menu system. The MSSP peripheral in SPI mode clocks the display, while the USART and CCP peripherals handle backlight PWM and rotary-encoder inputs. With the industrial -40 C to +85 C temperature grade, the same firmware runs on factory HMI panels, point-of-sale terminals, and laboratory instruments. Microchip's free graphics library can be ported to the device with minimal effort.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F6620T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F6620-I/PT | PIC18F6620-E/PT | PIC18F6620T-I/PTVAO | PIC18F6520-I/PT | PIC18F6525T-I/PT | PIC18F6720-I/PT |
|---|---|---|---|---|---|---|---|
| Package | 64-pin TQFP (PT) 10x10 mm | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 64 KB | 64 KB | 64 KB | 64 KB | 32 KB (-50%) | 48 KB (-25%) | 128 KB (+100%) |
| Data RAM | 3840 bytes | 3840 bytes | 3840 bytes | 3840 bytes | 2048 bytes (-47%) | 3840 bytes | 3840 bytes |
| Data EEPROM | 1024 bytes | 1024 bytes | 1024 bytes | 1024 bytes | 1024 bytes | 1024 bytes | 1024 bytes |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C | -40 C to +125 C (extended) | -40 C to +125 C (automotive) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Supply 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 | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
| Maximum CPU Speed | 25 MHz / 40 MHz family | 25 MHz / 40 MHz family | 25 MHz / 40 MHz family | 25 MHz / 40 MHz family | 25 MHz / 40 MHz family | 25 MHz / 40 MHz family | 25 MHz / 40 MHz family |
| Pinout / Package Match | Yes (TQFP-64 baseline) | Yes - identical | Yes - identical | Yes - identical | Yes - same TQFP-64 footprint | Yes - same TQFP-64 footprint | Yes - same TQFP-64 footprint |
Key Differentiators
- Largest flash in the 64-pin TQFP PIC18F6620 sub-family (vs PIC18F6520-I/PT)
- Industrial temperature grade with same electrical specs as the -E variant (vs PIC18F6620-E/PT)
- Smaller flash allows headroom upgrade to PIC18F6720 in same package (vs PIC18F6720-I/PT)
Design Notes
Place one 0.1 uF ceramic decoupling capacitor adjacent to every VDD/VSS pair on the PIC18F6620T-I/PT (the 64-pin TQFP has 4 VDD pins and 5 VSS pins). Add a single 10 uF tantalum or low-ESR ceramic bypass at the package entry. Keep the VDD trace width at least 0.5 mm and use a star-ground topology so ADC reference accuracy is preserved when high-current PWM outputs switch.
Reserve a 5-pin ICSP/ICD header footprint (VPP/MCLR, PGD, PGC, VDD, GND) on every board, even production units. The PIC18F6620T-I/PT supports in-circuit serial programming and ICD debugging via the RB5/RB6/RB7 pins. Adding the header post-layout is impossible without respinning the PCB; populating it as a 2x3 header with the middle pads grounded keeps the option open at zero BOM cost in production.
Estimated: leaving the parallel slave port (PORTD/PORTE) pins as analog by default can prevent digital reads at startup - configure ADCON1 early in firmware. The MCLR pin must never be left floating; tie it to VDD through a 10 kohm resistor with a 100 nF capacitor to ground for safe in-circuit programming. The PIC18F6620T-I/PT is NOT a 3.3 V part - using the PIC18LF6620 instead is mandatory on lower-voltage rails.
The TQFP-64 package has a theta_JA of approximately 50 C/W on a standard 4-layer JEDEC test board. For an industrial design with -40 C to +85 C ambient, the junction can therefore rise 4 C per 100 mW dissipated, leaving plenty of thermal margin at typical 8-bit MCU power levels (5-50 mW active). No external heatsink is required, but the exposed pad is not present on this package, so thermal relief comes from PCB copper pours tied to VSS.
Compliance Information
RoHS compliant and lead-free per Microchip product page and DigiKey compliance data. Industrial temperature grade (-40 C to +85 C); for AEC-Q100 automotive qualification choose the PIC18F6620T-I/PTVAO or PIC18F6620-E/PT variant instead.
