PIC18F8585T-I/PT - 48KB Flash 8-bit MCU, TQFP-80 | Microchip
MPN: PIC18F8585T-I/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.47 | $18.47 |
| 10 | $16.85 | $168.50 |
| 100 | $14.92 | $1,492.00 |
| 500 | $13.18 | $6,590.00 |
| 1,000 | $11.75 | $11,750.00 |
PIC18F8585T-I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals. The 8-bit MCU class uses an 8-bit data path and instruction word widths of 16 bits (PIC18). Microcontrollers sit within the broader hierarchy: microcontroller -> embedded processor -> semiconductor IC. PIC18 devices target applications requiring deterministic real-time control, low power, and rich peripheral integration at low cost.
Key features include: 48KB self-programmable Flash, 3328 bytes SRAM, 1024 bytes EEPROM, hardware multiplier, 16-bit timers, 10-bit ADC with up to 16 channels, two USARTs, MSSP (SPI/I2C), CAN module, parallel slave port, and a 5-bit/8-bit parallel port. The wide operating range supports automotive (-40C to +125C) and industrial environments. Five 8-bit I/O ports (PORTA-PORTE) plus PORTF/PORTG provide 70 general-purpose I/O lines. Two capture/compare/PWM modules and enhanced CCP add flexible motor-control capability.
Internally, the PIC18F8585 uses a 16-bit Harvard architecture with pipelined instruction fetch and an 8-bit ALU plus hardware multiply. The enhanced instruction set includes C-optimized constructs and bit manipulation. A 10-channel, 10-bit ADC supports both single-ended and differential conversions for sensor acquisition. An integrated CAN 2.0B controller and parallel port make the device suited to industrial networking and instrumentation.
Typical applications include industrial control panels, automotive body and HVAC modules, security and access systems, medical instrumentation, and HVAC controllers. The high pin count (80 TQFP) accommodates parallel LCD interfaces, multiple UART links, and large I/O expansion, while the 5V-tolerant I/O simplifies interfacing to legacy 5V peripherals.
A key design consideration: at 40 MHz, the supply current draw requires proper decoupling - place a 100nF ceramic capacitor on each VDD/VSS pair close to the pins, plus a bulk 10uF tantalum or ceramic capacitor near the IC. In-Circuit Serial Programming (ICSP) requires dedicated ICSPCLK/ICSPDAT pins routed with short traces to the programming header to prevent signal integrity issues.
This page synthesizes distributor pricing, drop-in 80-pin TQFP alternatives, and practical design notes not found in the manufacturer datasheet, enabling faster component selection for engineers and procurement teams.
Drop-in alternatives for PIC18F8585T-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 PIC18F8585T-I/PT (same form factor and footprint) — differing in Package, Core Architecture, ADC, Program Memory (Flash), I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F8585-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F8585-E/PT
✅ Drop-In✓ In Stock
$9.55 / Unit
View Datasheet →PIC18F8585T-I/PT
✅ Drop-In✓ In Stock
$11.75 / Unit
View Datasheet →PIC18F67K90-I/PT
✅ Drop-In✓ In Stock
$7.55 / Unit
View Datasheet →PIC18F66K90-I/PT
✅ Drop-In✓ In Stock
$4.15 / Unit
View Datasheet →PIC18F8520-I/PT
✅ Drop-In✓ In Stock
$5.1586 / Unit
View Datasheet →PIC18F8585T-I/PT Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-bit |
| Series | PIC18F |
| Program Memory Size | 48KB (24K x 16) |
| RAM Size | 3.25KB (3328 x 8) |
| EEPROM Size | 1024 bytes |
| Maximum Clock Speed | 40 MHz |
| MIPS | 10 MIPS |
| Supply Voltage (Vcc/Vdd) | 4.2 V to 5.5 V |
| I/O Pins | 70 |
| ADC | 10-bit, up to 16 channels |
| Connectivity | I2C, SPI, UART, CAN, Parallel |
| Peripherals | Brown-out Detect/Reset, LVD, POR, PWM, WDT |
| Number of Timers | 4 (16-bit) |
| Data Bus Width | 16-bit |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 80-TQFP (12x12 mm) |
| Mounting Type | Surface Mount |
| ROM Type | Flash |
| RoHS Status | Compliant |
PIC18F8585T-I/PT Pin Configuration
| Pin 1 | OSC1 — Oscillator input / external clock input |
| Pin 2 | OSC2 — Oscillator output |
| Pin 3 | MCLR — Master clear reset (active low) |
| Pin 4 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 7 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Pin 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 10 | VDD — Positive supply voltage |
| Pin 11 | VSS — Ground reference |
| Pin 12 | RA6/OSC2 — PORTA bit 6 / alternate oscillator output |
| Pin 13 | RA7/OSC1 — PORTA bit 7 / alternate oscillator input |
| Pin 14 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Pin 15 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Pin 16 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Pin 17 | RB3/CCP2 — PORTB bit 3 / CCP2 I/O |
| Pin 18 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Pin 19 | RB5/PGM — PORTB bit 5 / LVP programming |
| Pin 20 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 21 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 22 | VDD — Positive supply voltage |
| Pin 23 | VSS — Ground reference |
| Pin 24 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator / clock |
| Pin 25 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator / CCP2 |
| Pin 26 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| Pin 27 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 28 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 29 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 30 | RC6/TX1/CK1 — PORTC bit 6 / USART1 TX / clock |
| Pin 31 | RC7/RX1/DT1 — PORTC bit 7 / USART1 RX / data |
| Pin 32 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 33 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 34 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 35 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 36 | RC4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 37 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 38 | RD6/PSP6/TX2/CK2 — PORTD bit 6 / PSP6 / USART2 TX |
| Pin 39 | RD7/PSP7/RX2/DT2 — PORTD bit 7 / PSP7 / USART2 RX |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply voltage |
| Pin 42 | RE0/RD/AN5 — PORTE bit 0 / Read control / AN5 |
| Pin 43 | RE1/WR/AN6 — PORTE bit 1 / Write control / AN6 |
| Pin 44 | RE2/CS/AN7 — PORTE bit 2 / Chip select / AN7 |
| Pin 45 | RE3 — PORTE bit 3 |
| Pin 46 | RF0/AN8 — PORTF bit 0 / Analog input 8 |
| Pin 47 | RF1/AN9/C2OUT — PORTF bit 1 / AN9 / Comparator 2 output |
| Pin 48 | RF2/AN10/C1OUT — PORTF bit 2 / AN10 / Comparator 1 output |
| Pin 49 | RF3/AN11 — PORTF bit 3 / Analog input 11 |
| Pin 50 | RF4/AN12 — PORTF bit 4 / Analog input 12 |
| Pin 51 | RF5/AN13 — PORTF bit 5 / Analog input 13 |
| Pin 52 | RF6/AN14 — PORTF bit 6 / Analog input 14 |
| Pin 53 | RF7/AN15 — PORTF bit 7 / Analog input 15 |
| Pin 54 | RG0 — PORTG bit 0 |
| Pin 55 | RG1 — PORTG bit 1 |
| Pin 56 | RG2 — PORTG bit 2 |
| Pin 57 | RG3 — PORTG bit 3 |
| Pin 58 | RG4 — PORTG bit 4 |
| Pin 59 | MCLR/RA5 — PORTE alternate / RA5 secondary function |
| Pin 60 | VDD — Positive supply voltage |
| Pin 61 | VSS — Ground reference |
| Pin 62 | CANRX — CAN bus receive input |
| Pin 63 | CANTX — CAN bus transmit output |
| Pin 64 | RH0 — PORTH bit 0 |
| Pin 65 | RH1 — PORTH bit 1 |
| Pin 66 | RH2 — PORTH bit 2 |
| Pin 67 | RH3 — PORTH bit 3 |
| Pin 68 | RH4 — PORTH bit 4 |
| Pin 69 | RH5 — PORTH bit 5 |
| Pin 70 | RH6 — PORTH bit 6 |
| Pin 71 | RH7 — PORTH bit 7 |
| Pin 72 | RJ0 — PORTJ bit 0 |
| Pin 73 | RJ1 — PORTJ bit 1 |
| Pin 74 | RJ2 — PORTJ bit 2 |
| Pin 75 | RJ3 — PORTJ bit 3 |
| Pin 76 | RJ4 — PORTJ bit 4 |
| Pin 77 | RJ5 — PORTJ bit 5 |
| Pin 78 | RJ6 — PORTJ bit 6 |
| Pin 79 | RJ7 — PORTJ bit 7 |
| Pin 80 | VSS — Ground reference |
Typical Applications
PIC18F8585T-I/PT is suitable for 6 applications: Industrial Control Panels, Automotive Body and HVAC Modules, Security and Access Control Systems, Medical Instrumentation, HVAC and Building Automation Controllers, Point-of-Sale Terminals and Printers.
Industrial Control Panels
The PIC18F8585T-I/PT fits industrial control panels because of its 70 GPIO, two USARTs for Modbus RTU/RS-485, CAN bus for fieldbus, and 16-channel 10-bit ADC for analog sensor inputs (temperature, pressure, level). Operating from 4.2V to 5.5V with -40C to +85C industrial rating, it survives factory-floor temperature swings. The 48KB Flash supports ladder-logic firmware plus Modbus/CANopen stacks, while 3328 bytes SRAM handles communication buffers. Brown-out reset and LVD protect against supply glitches common in motor-driven cabinets. The 80-pin TQFP footprint exposes enough I/O for push-button matrix scanning, relay drivers, and segmented LCD interfaces.
Recommended
Automotive Body and HVAC Modules
The PIC18F8585T-I/PT suits automotive body and HVAC control modules where CAN bus connectivity, PWM motor control, and 5V-tolerant GPIO drive sensor-actuator networks. The integrated CAN 2.0B controller interfaces directly with vehicle bus networks, while four 16-bit timers with PWM drive blower fans, blend doors, and stepper motors. 70 GPIO accommodate multiplexed switch inputs, LED drivers, and LIN slave bridges. The industrial -40C to +85C rating handles cabin temperature ranges; for under-hood (up to +125C), the PIC18F8585-E/PT variant is preferred. The 48KB Flash supports CAN stack, OBD-II diagnostics, and HVAC control algorithms simultaneously.
Recommended
Security and Access Control Systems
The PIC18F8585T-I/PT is well-matched to security and access control panels requiring multiple serial interfaces, keypad scanning, and LCD display driving. Two USARTs allow simultaneous connection to a central monitoring station and a peripheral reader (card reader, biometric scanner), while MSSP in SPI mode interfaces Wiegand readers or AES-encrypted keypads. The 16-channel ADC monitors battery voltage, tamper switches, and PIR sensor analog outputs. With 48KB Flash, firmware can include AES encryption routines, event logging, and RTC handling. The 70 GPIO easily drives 4x4 keypads, status LEDs, and relay-controlled door strikes without external I/O expanders.
Recommended
Medical Instrumentation
The PIC18F8585T-I/PT serves in medical instrumentation front-ends where multiple analog channels, isolated serial links, and deterministic 8-bit control are needed. The 16-channel 10-bit ADC digitizes signals from temperature sensors, pressure transducers, and impedance-measurement front-ends; 70 GPIO controls front-panel switches, status LEDs, and segment LCD multiplexing. Two USARTs connect to a host PC for data logging and to a calibration module over RS-232/485. The 5V-tolerant I/O simplifies interfacing to legacy medical-grade 5V analog front-ends. Industrial -40C to +85C rating suits laboratory and bedside equipment; for higher reliability, the -E variant (-40C to +125C) is recommended.
Recommended
HVAC and Building Automation Controllers
The PIC18F8585T-I/PT fits HVAC and building automation controllers that need to manage multiple zone sensors, valve actuators, and communication with a central BMS. The CAN bus interfaces BACnet or vendor-specific building automation protocols, while USARTs link to legacy RS-485 Modbus networks. The 16-channel ADC reads thermistor temperature sensors, humidity probes, and pressure transducers with 10-bit resolution sufficient for setpoint control. PWM outputs drive damper motors and pulse-width-modulated valves. The 48KB Flash accommodates scheduling, PID control loops, and protocol stacks simultaneously; 3328 bytes RAM handles Modbus and BACnet buffers.
Recommended
Point-of-Sale Terminals and Printers
The PIC18F8585T-I/PT drives point-of-sale terminals and receipt printers where multiple peripheral interfaces, keypad scanning, and LCD/character display control are essential. Two USARTs connect to magnetic-stripe readers and external printers, while MSSP in SPI mode drives graphical or alphanumeric LCD controllers. The 70 GPIO easily handles 4x5 keypad matrices, multiple status LEDs, and buzzer/piezo driver lines. The 16-channel ADC monitors power supply voltage, battery state, and paper sensors. With 48KB Flash, firmware can include custom fonts, USB stacks, and transaction logging. The 5V operation simplifies interfacing to legacy POS peripherals.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F8585T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F8585-I/PT | PIC18F8585-E/PT | PIC18F67K90-I/PT | PIC18F66K90-I/PT | PIC18F8520-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-TQFP (12x12 mm) | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same |
| Lifecycle Status | NRND | NRND | NRND | Active | Active | NRND |
| Program Memory (Flash) | 48 KB (24K x 16) | 48 KB (24K x 16) | 48 KB (24K x 16) | 64 KB | 64 KB | 32 KB |
| Maximum Clock Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 40 MHz (10 MIPS) |
| Operating Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.0 V to 5.5 V |
| Operating Temperature | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +125C (E grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) |
| ADC Resolution | 10-bit (16 channels) | 10-bit (16 channels) | 10-bit (16 channels) | 12-bit (24 channels) | 12-bit (24 channels) | 10-bit (16 channels) |
| Approx. Unit Price (qty 1) | $18.47 | ~$18.47 | ~$20.50 | ~$7.20 | ~$6.80 | ~$15.00 |
Key Differentiators
- Larger program memory (48 KB) vs PIC18F8520 family (vs PIC18F8520-I/PT)
- Industrial temperature range standard on -I grade (vs PIC18F8585-E/PT)
- Modern migration path with same footprint (vs PIC18F67K90-I/PT)
- NRND status requires migration planning (vs PIC18F67K90-I/PT)
Design Notes
Place a 100 nF ceramic decoupling capacitor on each VDD/VSS pin pair, with the capacitor lead length less than 2 mm to minimize parasitic inductance. Add a bulk 10 uF ceramic or tantalum capacitor at the IC supply entry. The PIC18F8585 datasheet specifies a maximum 40 MHz operating frequency requiring stable 4.2V-5.5V supply; use a low-noise LDO such as MCP1700 or a switching regulator with adequate output ripple filtering to keep digital supply noise below 50 mVpp. For battery-powered applications, leverage the PIC18's sleep mode and BOR to minimize quiescent current.
Route the ICSP programming signals (ICSPCLK/ICSPDAT, also shared with RB6/RB7) with short traces directly to a 6-pin programming header, keeping the trace length under 50 mm. Add ESD protection diodes on the MCLR pin (or use Microchip's recommended MCP130 reset supervisor). For TQFP-80 packages, use a 4-layer PCB with continuous ground plane directly under the IC to reduce EMI; signal traces on outer layers should not cross the ground plane split. Maintain at least 0.2 mm clearance between analog and digital signal traces to prevent ADC crosstalk.
Do not exceed 5.5V on VDD - the PIC18F8585 is not 3.3V tolerant at full speed and overvoltage can permanently damage the silicon. When using the analog channels (AN0-AN15), configure unused ADC pins as digital outputs or leave them disabled to reduce shoot-through current. The MCLR pin must NOT be left floating; either tie to VDD through a 10 kohm pull-up or use the internal MCLR enable configuration. For CAN bus designs, always include a 120 ohm termination resistor at each end of the bus and a common-mode choke for EMI suppression.
Compliance Information
RoHS and REACH compliant per Microchip product declaration. The 'I' suffix denotes industrial temperature grade (-40C to +85C); the 'E' suffix variant is automotive-extended (-40C to +125C). For AEC-Q100 qualified parts, consider PIC18F-K40 automotive families.
