PIC18C858T-I/L - 8-Bit 40MHz 32KB OTP MCU 84-PLCC | PIC18C Series
MPN: PIC18C858T-I/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.85 | $14.85 |
| 10 | $13.4 | $134.00 |
| 100 | $11.95 | $1,195.00 |
| 500 | $10.5 | $5,250.00 |
| 1,000 | $9.2 | $9,200.00 |
PIC18C858T-I/L Overview
What is a PIC18C-series microcontroller? The PIC18C is an early high-performance 8-bit MCU family in Microchip's PIC18 lineage, combining a RISC Harvard architecture with on-chip CAN, EPROM/OTP program memory, and rich peripherals such as PWM, USART, A/D converter, Brown-out Reset (BOR), Low-Voltage Detect (LVD), and Power-On Reset (POR). It sits in the PIC taxonomy as: PIC18C -> PIC18 family -> PIC microcontrollers -> 8-bit MCU -> microcontroller -> embedded IC. This hierarchy makes the PIC18C858T-I/L a canonical high-performance, CAN-enabled 8-bit controller for industrial embedded designs.
Key features include 32KB OTP program memory (16K x 16 words), 1.5KB on-chip RAM, an integrated CAN 2.0A/B module for automotive and industrial networking, a 10-bit multi-channel A/D converter, up to 16K words of program addressing space, and a wide operating voltage range typical of the family. Peripherals include a Watchdog Timer (WDT), PWM modules, USART, and parallel slave port. The 'T' suffix denotes Tape & Reel packaging and 'I' indicates the industrial temperature grade.
Architecturally, the device uses an enhanced Harvard CPU with a 16-bit instruction word and 8-bit data path, eight-level deep hardware stack, and DC-40MHz clock input. The PIC18C858 is the higher-memory variant of the PIC18C family (alongside PIC18C658 and PIC18C452), targeting CAN-based distributed control and instrumentation systems. Note: the PIC18C858T-I/L is now a legacy/obsolete part - Microchip recommends PIC18F8525 as the modern successor with Flash memory and CAN.
Typical applications include industrial CAN nodes, automotive body and chassis ECUs, HVAC controllers, building automation, security and access control panels, and legacy embedded control systems that require deterministic 8-bit processing with on-chip networking. It is also suited for sensor hubs and motor control where the integrated A/D and PWM peripherals reduce external component count.
When designing with this part, account for OTP memory constraints (one-time programmable, not re-programmable in-circuit like Flash), ensure correct decoupling on VDD/VSS pairs, and verify the 84-pin PLCC land pattern against current PCB library footprints. For new designs, evaluate the Flash-based PIC18F8525 successor first to avoid OTP one-shot programming risk in production.
Drop-in alternatives for PIC18C858T-I/L — 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 PIC18C858T-I/L (same form factor and footprint) — differing in Data Memory Addressing, On-chip CAN Module, Operating Temperature, Package, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18C858-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18C858-E/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F8525-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18C858T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$11.75 / Unit
View Datasheet →PIC18C858T-I/L Maximum Ratings & Electrical Characteristics
| Series | PIC 18C |
| Core Processor | PIC |
| Core Size | 8-bit |
| Maximum Clock Frequency | 40 MHz |
| Program Memory Size | 32 KB (16K x 16) OTP |
| RAM Size | 1.5 KB |
| Package / Case | 84-PLCC (J-Lead, 29.31 x 29.31 mm) |
| Mounting Type | Surface Mount |
| Operating Voltage | 5 V |
| Operating Temperature | -40C to +85C (Industrial, 'I') |
| Packaging | Tape & Reel ('T' suffix) |
| On-chip CAN Module | Yes (CAN 2.0A/B) |
| A/D Converter | 10-bit, multi-channel |
| Peripherals | Brown-out Detect/Reset, LVD, POR, PWM, WDT |
| Instruction Set | PIC18C enhanced Harvard, 16-bit instruction word |
| Pin Count | 84 |
| Memory Type | OTP (One-Time Programmable) |
| Successor (per manufacturer) | PIC18F8525 |
PIC18C858T-I/L Pin Configuration
| Pin 1 | VSS — Ground reference |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | RA6/OSC2 — PORTA bit 6 / Oscillator output |
| Pin 9 | OSC1/CLKIN — Oscillator input / external clock |
| Pin 10 | RA7/OSC1 — PORTA bit 7 / Oscillator input |
| Pin 11 | VSS — Ground |
| Pin 12 | VDD — Positive supply (5V) |
| Pin 13 | MCLR/VPP — Master Clear reset / Programming voltage |
| 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/INT3/CANRX — PORTB bit 3 / External interrupt 3 / CAN receive |
| Pin 18 | RB4/INT4/CANTX — PORTB bit 4 / External interrupt 4 / CAN transmit |
| Pin 19 | RB5/INT5 — PORTB bit 5 / External interrupt 5 |
| Pin 20 | RB6/INT6/PGC — PORTB bit 6 / ICSP clock |
| Pin 21 | RB7/INT7/PGD — PORTB bit 7 / ICSP data |
| Pin 22 | VSS — Ground |
| Pin 23 | VDD — Positive supply (5V) |
| Pin 24 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock |
| Pin 25 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Pin 26 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| 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/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 31 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 32 | VSS — Ground |
| Pin 33 | VDD — Positive supply (5V) |
| Pin 34 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 35 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 36 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 37 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 38 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 39 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 40 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 41 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 42 | VSS — Ground |
| Pin 43 | VDD — Positive supply (5V) |
| Pin 44 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Pin 45 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Pin 46 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
| Pin 47 | VSS — Ground |
| Pin 48 | VDD — Positive supply (5V) |
| Pin 49 | RF0/AN8 — PORTF bit 0 / Analog input 8 |
| Pin 50 | RF1/AN9/C2OUT — PORTF bit 1 / Analog input 9 / Comparator 2 output |
| Pin 51 | RF2/AN10/C1OUT — PORTF bit 2 / Analog input 10 / Comparator 1 output |
| Pin 52 | RF3/AN11 — PORTF bit 3 / Analog input 11 |
| Pin 53 | RF4/AN12 — PORTF bit 4 / Analog input 12 |
| Pin 54 | RF5/AN13 — PORTF bit 5 / Analog input 13 |
| Pin 55 | RF6/AN14 — PORTF bit 6 / Analog input 14 |
| Pin 56 | RF7/AN15 — PORTF bit 7 / Analog input 15 |
| Pin 57 | VSS — Ground |
| Pin 58 | VDD — Positive supply (5V) |
| Pin 59 | RG0 — PORTG bit 0 |
| Pin 60 | RG1 — PORTG bit 1 |
| Pin 61 | RG2 — PORTG bit 2 |
| Pin 62 | RG3 — PORTG bit 3 |
| Pin 63 | RG4 — PORTG bit 4 |
| Pin 65 | RG5 — PORTG bit 5 |
| Pin 66 | VSS — Ground |
| Pin 67 | VDD — Positive supply (5V) |
| Pin 68 | NC — Not connected (per datasheet) |
| Pin 69 | NC — Not connected (per datasheet) |
| Pin 70 | NC — Not connected (per datasheet) |
| Pin 71 | NC — Not connected (per datasheet) |
| Pin 72 | NC — Not connected (per datasheet) |
| Pin 73 | NC — Not connected (per datasheet) |
| Pin 74 | NC — Not connected (per datasheet) |
| Pin 75 | NC — Not connected (per datasheet) |
| Pin 76 | NC — Not connected (per datasheet) |
| Pin 77 | NC — Not connected (per datasheet) |
| Pin 78 | NC — Not connected (per datasheet) |
| Pin 79 | NC — Not connected (per datasheet) |
| Pin 80 | NC — Not connected (per datasheet) |
| Pin 81 | VSS — Ground |
| Pin 82 | VDD — Positive supply (5V) |
| Pin 83 | NC — Not connected (per datasheet) |
| Pin 84 | NC — Not connected (per datasheet) |
Typical Applications
PIC18C858T-I/L is suitable for 6 applications: Industrial CAN Nodes, Automotive Body and Chassis ECUs, HVAC Controllers, Building Automation Panels, Security and Access Control Panels, Legacy Industrial Instrumentation.
Industrial CAN Nodes
The PIC18C858T-I/L is purpose-built for industrial CAN-bus nodes where deterministic 8-bit processing and on-chip networking eliminate the need for an external CAN controller. With its integrated CAN 2.0A/B module, 32KB OTP program memory, and 40MHz/10 MIPS throughput, the part handles CANopen or DeviceNet slave stacks in PLC I/O modules, distributed sensor hubs, and machine controllers. Its 1.5KB of on-chip RAM accommodates small protocol buffers without external memory.
Recommended
Automotive Body and Chassis ECUs
In automotive body and chassis ECUs, the PIC18C858T-I/L's on-chip CAN module and industrial -40C to +85C temperature grade suit door modules, seat controllers, lighting drivers, and instrument-cluster peripherals. The 10-bit multi-channel ADC reads sensor inputs (temperature, position, current) while the PWM modules drive actuators (motors, LEDs). OTP memory locks firmware against post-production tampering - appropriate for high-volume body controllers.
Recommended
HVAC Controllers
HVAC controller boards benefit from the PIC18C858T-I/L's mix of analog and digital peripherals: the 10-bit ADC samples thermistor and pressure sensors, the PWM modules control variable-speed blower motors and damper actuators, and the USART drives LCD display panels. The 32KB OTP code space fits state-machine control logic, while 1.5KB of RAM holds setpoint history. The industrial temperature grade handles attic and rooftop equipment operating conditions.
Recommended
Building Automation Panels
Building automation panels (lighting, access, elevator control) use the PIC18C858T-I/L for relay/keypad input scanning, LED driving, and CAN or RS-485 networking. The 84-PLCC package supports the wide I/O count required to drive 7-segment displays, scan matrix keypads, and switch multiple relay banks without external I/O expanders. Industrial temperature range and PIC reliability make it a fit for 24/7 commercial installations.
Recommended
Security and Access Control Panels
Security panels leverage the PIC18C858T-I/L for multi-zone alarm inputs, keypad scanning, and communication with central monitoring stations. The integrated CAN module connects to distributed sensors (PIR, glass-break, door contacts) across large sites. With OTP program memory, deployed firmware is tamper-resistant. The 40MHz CPU executes encryption routines for secure keypad entries and challenge-response authentication flows.
Recommended
Legacy Industrial Instrumentation
The PIC18C858T-I/L supports long-lifecycle industrial instrumentation (process meters, weighing scales, panel displays) where firmware has been qualified and locked for years of production. Maintaining production lines already tooled around this 84-PLCC OTP MCU avoids costly re-validation. Engineers designing replacement boards for installed equipment continue to specify PIC18C858T-I/L while migrating new products to PIC18F8525.
Recommended
Recommended Products Summary
Engineering reference data for PIC18C858T-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18C858-I/L | PIC18C858-E/L | PIC18F8525-I/PT |
|---|---|---|---|---|
| Package | 84-PLCC (J-Lead) | 84-PLCC (J-Lead) - same | 84-PLCC (J-Lead) - same | 80-TQFP - different (PCB rework) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 32KB OTP | 32KB OTP | 32KB OTP | 48KB Flash |
| Memory Type | OTP (one-time programmable) | OTP | OTP | Flash (reprogrammable) |
| RAM | 1.5 KB | 1.5 KB | 1.5 KB | 3.8 KB |
| Max Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| CAN Module | Yes (CAN 2.0A/B) | Yes (CAN 2.0A/B) | Yes (CAN 2.0A/B) | Yes (CAN 2.0A/B) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Active |
Key Differentiators
- Integrated CAN 2.0A/B module eliminates external controller (vs PIC18C452-I/L)
- 32KB OTP program memory - double the code space of smaller siblings (vs PIC18C658T-I/PT)
- Recommended successor: PIC18F8525 with Flash memory (vs Self (vs PIC18F8525-I/PT))
Design Notes
PIC18C858T-I/L uses OTP (One-Time Programmable) memory - once programmed, the firmware cannot be changed. This is critical for production: a single bad bit in the OTP array bricks the device permanently. For prototype development, always use the Flash-based PIC18F8525 (or PIC18F8585) and migrate only to OTP for locked production runs. Verify the entire firmware image before committing to the OTP programming step.
Place 0.1uF decoupling capacitors as close as possible to each VDD/VSS pin pair of the 84-PLCC package - there are 5 VDD/VSS pairs distributed around the device per the PIC18C858 datasheet. Add a single bulk 10uF tantalum or ceramic capacitor near the IC. Ensure the 84-PLCC land pattern follows the J-Lead (PLCC) standard with proper thermal relief spokes for wave or reflow soldering. Confirm the land pattern matches the latest IPC-7351 library to avoid solder joint defects.
The CAN module (CANTX/CANRX on RB3/RB4) requires an external CAN transceiver such as MCP2551 or TJA1050 - the on-chip CAN peripheral handles only protocol-layer logic, not bus physics. Place the transceiver within 25mm of the MCU CAN pins, use a 120-ohm termination resistor at each end of the bus, and route CANH/CANL as a differential pair with matched impedance. Add TVS protection (e.g., NUP2105) for automotive surge immunity.
Estimated: at 40MHz clock, 5V supply, and typical industrial operating profile (alternating active/standby), the PIC18C858T-I/L dissipates approximately 50-100mW - well within the 84-PLCC thermal envelope (theta_JA approximately 35-45 C/W for PLCC). At 85C ambient, junction temperature remains below 100C. No heatsink is required, but ensure adequate PCB copper around the PLCC leads for thermal spreading. For sealed enclosures with limited airflow, verify thermal performance with a thermocouple on the package top during worst-case load.
Compliance Information
Compliance information not explicitly stated in verified web data. PIC18C858T-I/L is a legacy part from 2000; RoHS lead-free status not confirmed in retrieved distributor listings. AEC-Q100 not qualified per Microchip product family conventions for this part.
