PIC18F84J11-I/PT - 8-Bit 40MHz 16KB Flash MCU | Microchip
MPN: PIC18F84J11-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.2 | $4,200.00 |
PIC18F84J11-I/PT Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, peripherals, and I/O. The PIC18 family uses an enhanced Harvard RISC architecture with separate program and data buses and a 16-bit instruction word optimized for C-compiled code. Within Microchip's hierarchy it sits above PIC16 and below PIC32, targeting cost-sensitive embedded applications where 8-bit deterministic behavior and low sleep current are decisive. Microcontrollers in this class are the control heart of products ranging from consumer appliances to industrial sensor nodes.
Key features include 70 digital I/O pins, an internal 8 MHz RC oscillator, nanoWatt technology power management modes, multiple communication peripherals (UART, SPI, I2C), and a 12-bit A/D converter with up to 15 channels. The PIC18J family supports self-programmability of Flash, allowing field firmware updates via the application code. Enhanced PWM, capture/compare and a 16-bit timer block support motor and power-conversion control loops.
The PIC18J architecture uses a two-stage pipeline with a wide 16-bit instruction path and dedicated hardware multiply, yielding 10 MIPS at 40 MHz core. The internal voltage regulator supports full-speed operation across 2.0V to 3.6V without external level shifters, and nanoWatt sleep modes drop quiescent current into the microamp range, suiting battery-powered designs that spend most of their life in standby.
Typical applications include data loggers, industrial controllers, sensor interfaces, white goods / consumer appliances, and battery-powered instruments. The 70 I/O pins make it well-suited for large user-interface panels or systems that must drive several character LCDs, keypads and relays from a single chip. The part is adapted to cost-sensitive applications such as data loggers, controllers, sensors and consumer goods.
When designing with this device, plan current budget carefully: 70 mA through 80 pins with 10 mA sink/source per pin can easily exceed the 200 mA package limit. Use the internal 8 MHz oscillator for low-EMI designs, and reserve the PLL only when 10 MIPS CPU throughput is mandatory. JTAG/ICSP programming requires dedicated RB6/RB7 pin sharing - keep these free for in-circuit programming in production.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC18F84J11-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 PIC18F84J11-I/PT (same form factor and footprint) — differing in Package, Operating Temperature, ADC, Core Architecture, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F84J11T-I/PT
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →PIC18F64J11-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.25 / Unit
View Datasheet →PIC18F8410-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.85 / Unit
View Datasheet →PIC18F8490-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.55 / Unit
View Datasheet →PIC18F67K90-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.55 / Unit
View Datasheet →PIC18F84J11-I/PT Maximum Ratings & Electrical Characteristics
| Family | PIC18 J-series |
| Core | 8-bit PIC RISC |
| Program Memory | 16 KB Flash (8K x 16) |
| Data Bus Width | 8-bit |
| Instruction Set | 16-bit enhanced |
| Maximum Clock Speed | 40 MHz |
| Performance | 10 MIPS |
| Supply Voltage | 2.0 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| I/O Pins | 70 |
| A/D Converter | 12-bit, up to 15 channels |
| Internal Oscillator | 8 MHz RC |
| Package | 80-TQFP (12 x 12 mm, 1 mm height) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18F84J11-I/PT 80-tqfp (12 x 12 mm, 1 mm height) Pin Configuration Guide
Pin configuration for PIC18F84J11-I/PT (80-tqfp (12 x 12 mm, 1 mm height) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC18F84J11-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC18F84J11-I/PT is suitable for 6 applications: Industrial Data Logger, Consumer Appliance Controller, Sensor Interface Module, Battery-Powered Handheld Instrument, HVAC Control Board, Industrial Control Panel HMI.
Industrial Data Logger
The PIC18F84J11-I/PT's 16 KB Flash and 70 I/O pins make it ideal for industrial data loggers capturing sensor streams over long intervals. With nanoWatt sleep current in the microamp range and an internal 8 MHz oscillator, the MCU can run for years from a single battery while logging periodic measurements. The 12-bit A/D with up to 15 channels handles analog sensor arrays directly. Placed on the same PCB as a serial EEPROM for non-volatile storage and an RTC for timestamping, it forms a complete battery-powered logger that operates down to 2.0 V without external regulation. The wide industrial temperature range (-40 to +85 C) supports outdoor and factory deployments without thermal conditioning.
Recommended
Consumer Appliance Controller
The PIC18F84J11-I/PT fits consumer appliance controllers (washing machines, dishwashers, induction cooktops) where 70 I/O pins drive segmented LCDs, keypads, relays and triac interfaces. Its 40 MHz / 10 MIPS performance executes motor-control state machines and user-interface logic with deterministic timing. nanoWatt sleep reduces standby power below regulatory limits for energy-star appliances. Designed onto a 12 x 12 mm TQFP footprint, it leaves space for analog front-end circuits for current sensing and zero-cross detection. Industrial temperature range allows reliable operation inside hot appliance enclosures.
Recommended
Sensor Interface Module
Sensor interface modules benefit from the PIC18F84J11-I/PT's 12-bit A/D with up to 15 channels and 70 I/O for digital sensor I/O. Its 10 MIPS performance runs linearization, calibration and protocol conversion (UART, SPI, I2C) without external logic. The internal 8 MHz oscillator eliminates the external crystal on cost-sensitive sensor boards, and the 2.0-3.6 V supply supports 3.3 V sensor rails directly. Used as the central aggregator in environmental sensor hubs or industrial 4-20 mA loop interfaces, it bridges analog field sensors to digital backhaul networks.
Recommended
Battery-Powered Handheld Instrument
The PIC18F84J11-I/PT's nanoWatt technology and 2.0-3.6 V supply suit battery-powered handheld instruments such as multimeters, barcode scanners and portable medical monitors. Sleep current drops into the microamp range, extending battery life across years of standby use. The 70 I/O pins drive segmented LCDs, keypads, IR LEDs and serial peripherals without external bus expanders. The internal 8 MHz oscillator avoids the external crystal cost and start-up time. Industrial -40 to +85 C range covers cold-storage and outdoor field deployments.
Recommended
HVAC Control Board
HVAC control boards leverage the PIC18F84J11-I/PT's 70 I/O pins to interface with thermostats, damper motors, relay coils and triac-switched fans. The 12-bit A/D reads thermistor temperature sensors for closed-loop climate control, while PWM outputs drive variable-speed fans. nanoWatt sleep modes reduce standby power below 1 W for energy-rated HVAC equipment. Operating reliably from 2.0-3.6 V and -40 to +85 C, the MCU is qualified for rooftop and basement installations. The 12 x 12 mm TQFP package fits the standard control-board form factor alongside optoisolated AC line interfaces.
Recommended
Industrial Control Panel HMI
Human-machine interfaces for industrial control panels need abundant I/O and deterministic behavior, both delivered by the PIC18F84J11-I/PT. Its 70 I/O pins drive multiplexed 7-segment or character LCDs, scan keypads up to 8x8, and toggle status LEDs. The 10 MIPS throughput refreshes displays and runs menu logic without flicker. nanoWatt technology saves power when the HMI is idle. Operating from 2.0-3.6 V and industrial -40 to +85 C, the MCU supports factory-floor environments without thermal management. The 80-TQFP footprint leaves room for CAN/RS-485 transceivers and digital I/O isolators.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F84J11-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F84J11T-I/PT | PIC18F64J11-I/PT | PIC18F8410-I/PT | PIC18F8490-I/PT | PIC18F67K90-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 footprint | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same |
| Core | PIC18 J-series 8-bit | PIC18 J-series 8-bit | PIC18 J-series 8-bit | PIC18F 8-bit | PIC18F 8-bit | PIC18 K-series 8-bit |
| Program Memory | 16 KB Flash | 16 KB Flash | 16 KB Flash | 256 KB Flash | 64 KB Flash | 128 KB Flash |
| Maximum Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 64 MHz |
| I/O Pins | 70 | 70 | 51 | 70 | 70 | 69 |
| Supply Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 1.8 V to 5.5 V (wider) |
| A/D Converter | 12-bit, 15 ch | 12-bit, 15 ch | 12-bit, 12 ch | 10-bit, 16 ch | 10-bit, 16 ch | 12-bit, 24 ch |
Key Differentiators
- Highest I/O count in the PIC18 J-series for TQFP-80 footprint (vs PIC18F64J11-I/PT)
- Tape-and-reel variant offers identical die without PCB redesign (vs PIC18F84J11T-I/PT)
- Lower-power PIC18 J-series core with nanoWatt sleep modes (vs PIC18F67K90-I/PT)
Design Notes
The PIC18F84J11-I/PT operates from 2.0 V to 3.6 V. Place a 100 nF decoupling capacitor as close as possible to each VDD pin and a single 10 uF bulk capacitor near the MCU. AVDD and AVSS must be tied to the same rails; add a ferrite bead between VDD and AVDD if the analog section shares the digital supply. Use a low-dropout regulator such as MCP1700 for 3.3 V systems from higher input rails.
The 80-TQFP package has 0.5 mm pitch - use 4-mil traces and 8-mil spaces for fan-out under the chip. Multiple VDD/VSS pins are distributed across the package; connect ALL of them. Route the 8 MHz crystal traces symmetrically and keep them short (under 5 mm) with a grounded guard ring to avoid coupling noise into the analog section. Reserve RB6/RB7 for ICSP programming; do not double these pins to peripherals in production designs.
Pin count trap: 70 I/O pins is more than the 200 mA total package current budget. Never drive all 70 pins simultaneously at 10 mA each - that is 700 mA and will trigger thermal shutdown. Calculate worst-case sink/source current before finalizing GPIO assignments. Also avoid setting CONFIG fuses that disable the internal oscillator without first verifying the external crystal is populated, otherwise the MCU has no clock and cannot be debugged.
The PIC18F84J11-I/PT is rated for 40 MHz digital operation but the 12-bit A/D is sensitive to digital switching noise. Sample A/D inputs when digital outputs are quiet (use PWM-triggered synchronized sampling), or insert a 1 us settling delay after switching port changes. For precision measurements, average 16+ samples to reject mains-frequency interference.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade (-40 to +85 C). AEC-Q100 not qualified - not intended for automotive safety-critical applications.
