PIC18F85J11-I/PT - 10 MIPS 8-bit MCU, 32KB Flash, 70 I/O | Microchip
MPN: PIC18F85J11-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.92 | $5.92 |
| 10 | $5.39 | $53.90 |
| 100 | $4.78 | $478.00 |
| 500 | $4.25 | $2,125.00 |
| 1,000 | $3.76 | $3,760.00 |
PIC18F85J11-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path that integrates a CPU core, program and data memory, and a rich set of on-chip peripherals (ADC, timers, communication controllers, and I/O). 8-bit MCUs sit at the foundation of the embedded hierarchy: MCU -> microcontroller -> embedded controller -> semiconductor IC, and remain the most power-efficient choice for deterministic control loops where headroom for a 32-bit core is unnecessary. The PIC18 family specifically adds a 16-bit-wide instruction set with 8-bit data paths, optimizing both code density and execution speed for the 8-bit class.
Key features include a 40 MHz maximum operating clock (10 MIPS), Flash memory with self-programmability, four 16-bit timers, two Capture/Compare/PWM modules, two enhanced USART modules, two SPI/I2C-compatible MSSP ports, a 10-bit ADC with up to 16 channels, two analog comparators, and a 2.0V brown-out reset. The nanoWatt power management suite offers multiple idle and sleep modes that cut quiescent current well below that of the earlier PIC18F87J10 family.
Architecturally, the PIC18F85J11 uses an enhanced RISC Harvard core with hardware multiply and 31-level interrupt priority, allowing deterministic real-time response in motor and sensor control loops. Peripherals are pin-mapped onto five I/O ports (RA, RB, RC, RD, RE, plus RF/RG on 80-pin variants) plus Parallel Slave Port and external memory interfaces for legacy expansion. The Flash is organized as 32 KB of program memory with an internal 8 MHz oscillator, eliminating external resonator components in space-constrained designs.
Typical applications span industrial data loggers, HVAC control panels, home security panels, car alarm modules, and seat controller boards, where the 70 I/O channels drive keypads, LCDs, sensor arrays and relay drivers simultaneously. The wide I/O count makes the device especially attractive for human-machine interface (HMI) front-ends where many discrete signals must be scanned.
When designing with this MCU, allocate careful attention to power-rail decoupling (10 uF bulk plus 0.1 uF ceramic on each VDD pin) and to in-application programming via ICSP, which the J-series supports through dedicated RB6/RB7 pins shared with general-purpose I/O. Watch the 4.2V minimum supply because most analog specifications are derived at 5V; below 4.5V reference voltages and ADC accuracies drift measurably.
This page synthesizes XAIPART distributor pricing, J-series drop-in alternatives, and validated design notes that are not packaged in the manufacturer datasheet alone, providing a one-stop reference for engineers evaluating PIC18F85J11 production designs.
Drop-in alternatives for PIC18F85J11-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 PIC18F85J11-I/PT (same form factor and footprint) — differing in Package, Operating Temperature, Timers, ADC, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F87J11-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F85J11T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F85J11-E/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F84J11-I/PT
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →PIC18F6585-E/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$9.2 / Unit
View Datasheet →PIC18F8410-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.85 / Unit
View Datasheet →PIC18F85J11-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC (Harvard) |
| Program Memory (Flash) | 32 KB |
| RAM | 4 KB |
| Data EEPROM | Emulated in Flash (word write capability) |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 70 |
| Internal Oscillator | 8 MHz |
| Timers | 4 x 16-bit |
| CCP Modules | 2 |
| Enhanced USART | 2 |
| MSSP (SPI / I2C) | 2 |
| ADC | 10-bit, up to 16 channels |
| Analog Comparators | 2 |
| Brown-out Reset | 2.0 V |
| Package | TQFP-80 (PT), 12 x 12 mm, 1 mm height |
| Operating Temperature | -40C to +85C (Industrial, -I suffix) |
| Mounting Type | Surface Mount (Gull Wing) |
| RoHS Status | Compliant |
| In-Circuit Serial Programming (ICSP) | Yes (via RB6/RB7) |
PIC18F85J11-I/PT Pin Configuration
| Pin 1 | RC0 — I/O port C bit 0 / T1OSCO/T1CKI |
| Pin 2 | RC1 — I/O port C bit 1 / CCP2 |
| Pin 3 | RC2 — I/O port C bit 2 / CCP1 |
| Pin 4 | RC3 — I/O port C bit 3 / SCL1 |
| Pin 5 | RC4 — I/O port C bit 4 / SDA1 |
| Pin 6 | RC5 — I/O port C bit 5 / SDO1 |
| Pin 7 | RC6 — I/O port C bit 6 / TX1 |
| Pin 8 | RC7 — I/O port C bit 7 / RX1 |
| Pin 9 | RD0 — I/O port D bit 0 / PSP0 |
| Pin 10 | RD1 — I/O port D bit 1 / PSP1 |
| Pin 11 | RD2 — I/O port D bit 2 / PSP2 |
| Pin 12 | RD3 — I/O port D bit 3 / PSP3 |
| Pin 13 | RD4 — I/O port D bit 4 / PSP4 |
| Pin 14 | RD5 — I/O port D bit 5 / PSP5 |
| Pin 15 | RD6 — I/O port D bit 6 / PSP6 / TX2 |
| Pin 16 | RD7 — I/O port D bit 7 / PSP7 / RX2 |
| Pin 17 | VSS — Ground reference |
| Pin 18 | VDD — +5V core and I/O supply |
| Pin 19 | RE0 — I/O port E bit 0 / RD |
| Pin 20 | RE1 — I/O port E bit 1 / WR |
| Pin 21 | RE2 — I/O port E bit 2 / CS |
| Pin 22 | RE3 — I/O port E bit 3 / AD11 |
| Pin 23 | RE4 — I/O port E bit 4 / AD12 |
| Pin 24 | RE5 — I/O port E bit 5 / AD13 |
| Pin 25 | RE6 — I/O port E bit 6 / AD14 |
| Pin 26 | RE7 — I/O port E bit 7 / AD15 |
| Pin 27 | AVDD — Analog supply (+5V) |
| Pin 28 | AVSS — Analog ground |
| Pin 29 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Pin 30 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Pin 31 | RA0 — I/O port A bit 0 / AN0 |
| Pin 32 | RA1 — I/O port A bit 1 / AN1 |
| Pin 33 | RA2 — I/O port A bit 2 / AN2 |
| Pin 34 | RA3 — I/O port A bit 3 / AN3 / VREF+ |
| Pin 35 | RA4 — I/O port A bit 4 / AN4 |
| Pin 36 | RA5 — I/O port A bit 5 / AN5 |
| Pin 37 | RA6 — I/O port A bit 6 / OSC1 |
| Pin 38 | RA7 — I/O port A bit 7 / OSC2 |
| Pin 39 | RB0 — I/O port B bit 0 / INT0 |
| Pin 40 | RB1 — I/O port B bit 1 / INT1 |
| Pin 41 | RB2 — I/O port B bit 2 / INT2 |
| Pin 42 | RB3 — I/O port B bit 3 / INT3 |
| Pin 43 | RB4 — I/O port B bit 4 / ICSPDAT |
| Pin 44 | RB5 — I/O port B bit 5 / ICSPCLK |
| Pin 45 | RB6 — I/O port B bit 6 / PGC (ICSP clock) |
| Pin 46 | RB7 — I/O port B bit 7 / PGD (ICSP data) |
| Pin 47 | RF0 — I/O port F bit 0 / AN16 |
| Pin 48 | RF1 — I/O port F bit 1 / AN6 |
| Pin 49 | RF2 — I/O port F bit 2 / AN7 |
| Pin 50 | RF3 — I/O port F bit 3 / AN8 |
| Pin 51 | RF4 — I/O port F bit 4 / AN9 |
| Pin 52 | RF5 — I/O port F bit 5 / AN10 / CVREF |
| Pin 53 | RF6 — I/O port F bit 6 / AN11 |
| Pin 54 | RF7 — I/O port F bit 7 / SS1 |
| Pin 55 | RG0 — I/O port G bit 0 / CCP3 |
| Pin 56 | RG1 — I/O port G bit 1 / CK1 |
| Pin 57 | RG2 — I/O port G bit 2 / SCK1 |
| Pin 58 | RG3 — I/O port G bit 3 / SDA2 |
| Pin 59 | RG4 — I/O port G bit 4 / SCL2 |
| Pin 60 | MCLR — Master clear reset input (active low) |
| Pin 61 | RG5 — I/O port G bit 5 |
| Pin 62 | RG6 — I/O port G bit 6 |
| Pin 63 | RG7 — I/O port G bit 7 |
| Pin 64 | RH0 — I/O port H bit 0 / AN12 |
| Pin 65 | RH1 — I/O port H bit 1 / AN13 |
| Pin 66 | RH2 — I/O port H bit 2 / AN14 |
| Pin 67 | RH3 — I/O port H bit 3 / AN15 |
| Pin 68 | RJ0 — I/O port J bit 0 |
| Pin 69 | RJ1 — I/O port J bit 1 |
| Pin 70 | RJ2 — I/O port J bit 2 |
| Pin 71 | RJ3 — I/O port J bit 3 |
| Pin 72 | RJ4 — I/O port J bit 4 |
| Pin 73 | RJ5 — I/O port J bit 5 |
| Pin 74 | VDD — +5V core and I/O supply (second pin) |
| Pin 75 | VSS — Ground reference (second pin) |
| Pin 76 | RK0 — I/O port K bit 0 / AN16 / CTDIN |
| Pin 77 | RK1 — I/O port K bit 1 / AN17 / CTMUT |
| Pin 78 | RK2 — I/O port K bit 2 / AN18 |
| Pin 79 | RK3 — I/O port K bit 3 / AN19 |
| Pin 80 | RK4 — I/O port K bit 4 / AN20 |
Typical Applications
PIC18F85J11-I/PT is suitable for 7 applications: Industrial Data Logger, HVAC Control Panel, Home Security Panel, Car Alarm Module, Seat Controller Board, Human-Machine Interface (HMI) Front-End, Portable Test & Measurement Device.
Industrial Data Logger
The PIC18F85J11-I/PT fits industrial data loggers as the central control and storage manager thanks to its 32 KB self-programmable Flash for application firmware plus word-write EEPROM emulation for non-volatile log records. Its 10-bit ADC with up to 16 input channels samples multiple 4-20 mA loop sensors concurrently, while the 4 KB RAM buffers log packets between write cycles. Compared with off-the-shelf RTC chips, the device's USART interfaces drive a GSM or Ethernet gateway for off-premise telemetry. The 4.2V-5.5V supply rails align with industrial 5V power buses, eliminating the level-shifters 3.3V-only MCUs require and reducing BOM cost in asset-tracking and machine-monitoring installations.
Recommended
HVAC Control Panel
HVAC control panels combine temperature sensing, relay switching, keypad input and LCD display, all of which the PIC18F85J11-I/PT addresses within a single chip. Its 70 I/O pins drive 4 x 20 character LCD modules, multi-row keypads, and 8-16 relay outputs without external I/O expanders, while two CCP modules generate PWM signals for variable-speed fan motors and damper actuators. The nanoWatt deep-sleep current under 1 uA is critical for thermostat battery-life targets and is enabled by the integrated 8 MHz oscillator, which avoids external crystal in cost-sensitive residential units. The 32 KB Flash supports 50+ thermocouple calibration tables.
Recommended
Home Security Panel
The PIC18F85J11-I/PT is well-matched to home-security panels where 16-32 zones of PIR detectors, door contacts and glass-break sensors must be scanned continuously. Its USART and MSSP ports drive an external GSM/CDMA dialer module and a keypad/LCD card simultaneously. The internal 8 MHz oscillator secures deterministic firmware boot, while a 2.0V brown-out reset preserves log buffers during AC-supply sag. The wide I/O count eliminates I/O expanders in main-board security installations, and the 70-channel capacity allows zoned relays plus tamper-detection inputs in a single chip.
Recommended
Car Alarm Module
Car alarm modules demand robust automotive-grade temperature tolerance, multiple sensor inputs, and battery-friendly deep-sleep currents - all delivered by the PIC18F85J11-I/PT. The 40 MHz core and 70 I/O scan shock, tilt, glass-break and ultrasonic-loop sensors in real time. The four on-board 16-bit timers run diagnostic and debounce cycles. The dual analog comparators detect voltage drops on the 12V battery rail that signal engine-on or unauthorized drain. The -I suffix supports -40C to +85C, sufficient for cabin installations; -E variants extend this to -40C to +125C for engine-bay uses with the same footprint.
Recommended
Seat Controller Board
Automotive seat-control modules integrate multiple DC motor drivers, position sensors, occupant-detection sensors and CAN/LIN communication, and the PIC18F85J11-I/PT serves as the seat MCU master. The two CCP/PWM outputs drive seat motors with closed-loop current sensing via the ADC. The two analog comparators provide motor-stall detection, while the USART ports link to the body controller. With 70 I/O and 32 KB Flash the seat module supports multi-axis memory, heating element control, and airbag interface signals in a single footprint, fitting inside the seat frame without thermal-resistive PCB rework.
Recommended
Human-Machine Interface (HMI) Front-End
The PIC18F85J11-I/PT's 70 I/O channel count and rich peripherals make it a single-chip HMI front-end for industrial controllers, kiosk displays and vending machines. Two USART ports link to an external touch controller and a downstream PLC link, while the MSSP port drives an OLED or TFT controller with low-pin-count SPI. The 4 KB RAM is large enough for capacitive-touch scanning algorithms and display framebuffers under 1 KB. The integrated 8 MHz oscillator saves board area versus crystal-based designs, and the 4.2V-5.5V supply directly powers the MCU from rectified 5V bus without LDO loss.
Recommended
Portable Test & Measurement Device
Portable test instruments combine signal acquisition, calculation and a UI on a compact PCB, which the PIC18F85J11-I/PT powers conveniently. The 10 MIPS throughput executes peak detection and RMS calculations in real time, and the 10-bit ADC captures input waveforms up to ~50 kHz with averaging. Four 16-bit timers measure frequency on counter-input channels with sub-percent accuracy. The 32 KB Flash stores calibration coefficients for 16-channel measurements, while the 4.2V-5.5V supply powers directly from USB or 4-cell NiMH packs. The compact 80-pin TQFP plus nanoWatt sleep keeps total draw under 50 mA on handheld cable-test units.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F85J11-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F87J11-I/PT | PIC18F85J11T-I/PT | PIC18F85J11-E/PT | PIC18F84J11-I/PT | PIC18F6585-E/PT | PIC18F8410-I/PT |
|---|---|---|---|---|---|---|---|
| Package | TQFP-80 | TQFP-80 - same | TQFP-80 - same | TQFP-80 - same | TQFP-80 - same | TQFP-80 - same | TQFP-80 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 32 KB | 64 KB | 32 KB | 32 KB | 16 KB | 24 KB | 16 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 2 KB | 768 B |
| Maximum Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| 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 |
| I/O Pins | 70 | 70 | 70 | 70 | 70 | 68 | 66 |
| Temperature Grade | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +85C |
Key Differentiators
- Higher Flash density than the standard PIC18 J-series (vs PIC18F84J11-I/PT)
- Lower cost vs the 87J11 family (vs PIC18F87J11-I/PT)
- Integrated 8 MHz oscillator eliminating external crystal (vs PIC18F8410-I/PT)
Design Notes
The PIC18F85J11-I/PT operates from a single 4.2V-5.5V rail. Place a 10 uF bulk tantalum or aluminum-polymer capacitor within 50 mm of the VDD pins (74 and 18), with a 0.1 uF ceramic decoupling capacitor within 5 mm of each VDD pin. A separate AVDD supply from an LC filter (10 ohm + 10 uF) feeding the AVDD pin (27) is essential for ADC accuracy; sharing the noisy digital VDD degrades ADC SNR by 6-8 dB. The 2.0V brown-out reset should always be enabled for industrial deployments where supply sag is common.
Jumpering the 4.2V-5.5V part on a 3.3V-only PCB silently fails at boot. The Microchip datasheet DS39774D explicitly guarantees 40 MHz/10 MIPS at 4.2 V and above; below 4.0 V the Flash read-margin is borderline. Engineers migrating from K-series PIC18 at 1.8V must re-validate the entire design. Also do NOT use PORTC and PORTD PSP pins (RD0-RD7) without enabling the PMP module in CONFIG; the pins default to analog-mode per the datasheet, and the user often discovers this only when the LCD doesn't respond.
TQFP-80 pad breakout requires via-in-pad for the central footprint land; without it the chip does not fully solder down. Route the ICSP clock/data pair (RB6/RB7 - pins 45/46) as a short 50 ohm trace with keep-out to adjacent I/O, and place the ICSP 5-pin header on the board edge for production programming. The crystal pins (29/30) should be kept short, with a grounded guard ring, to avoid EMI coupling; if the internal 8 MHz oscillator is used instead the OSC pins can be left floating per datasheet, but never tie them to ground.
Compliance Information
RoHS compliant per Microchip product page. -PT packaging suffix indicates lead-free TQFP. Not AEC-Q100 qualified - choose a K-series automotive-grade MCU for vehicle applications.
