PIC18C858T-E/PT - 8-Bit MCU, 32KB OTP, CAN 80-TQFP | Microchip
MPN: PIC18C858T-E/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $12.95 | $129.50 |
| 100 | $11.2 | $1,120.00 |
| 500 | $9.85 | $4,925.00 |
| 1,000 | $8.95 | $8,950.00 |
PIC18C858T-E/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and peripherals on one die. Within the taxonomy, an MCU belongs to microcontrollers -> embedded controllers -> microprocessors -> integrated circuits -> semiconductors. The PIC18C family specifically represents Microchip's high-performance 8-bit line with C-optimized instruction set, where PIC18C858 sits at the high-pin-count (80-pin) end of the spectrum, designed for CAN-connected industrial and automotive body/comfort modules.
Key features include integrated CAN 2.0B controller, USART, MSSP (SPI/I2C), 8-channel 10-bit ADC, capture/compare/PWM modules, and a wide 2.5V-5.5V operating range. The OTP program memory (One-Time-Programmable) is suitable for high-volume production where firmware is finalized and code-update isn't required. The 40 MHz clock delivers 10 MIPS instruction throughput, sufficient for real-time CAN node and motor-control loops.
The device uses a Harvard-architecture RISC core with separate code and data buses, enabling 2-cycle instruction execution and predictable interrupt latency. The high I/O count (68 pins) supports parallel HMI panels, multiple sensor inputs, and simultaneous communication buses (CAN + SPI + I2C + USART) without external bus expanders.
Typical applications include automotive body controllers (CAN nodes), industrial automation modules, building HVAC controllers, and CAN-based sensor networks. The OTP memory suits high-volume OEM lines that ship identical firmware; for field-upgradeable applications, designers should evaluate PIC18F-series flash replacements such as PIC18F8525.
When designing with PIC18C858T-E/PT, verify the OTP memory constraint against firmware-revision strategy - this part is not user-reprogrammable. Cross-reference Microchip's PIC18F8525 as the modern flash equivalent for new designs. Always use Microchip's ICD2/ICD3 in-circuit debugger with appropriate header for development before committing to OTP production.
This page synthesizes distributor pricing, drop-in drop-in alternatives from the same PIC18C family and PIC18F-series flash successors, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18C858T-E/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 PIC18C858T-E/PT (same form factor and footprint) — differing in Package, Operating Temperature, CAN Module, ADC, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F8525-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18C858-E/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$8.91 / Unit
View Datasheet →PIC18C858T-E/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC18C |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 32 KB (16K x 16 words) |
| RAM Size | 1.5 KB |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Temperature | -40 C to +125 C (automotive grade -E) |
| I/O Pins | 68 |
| Package | 80-TQFP (12 x 12 mm) |
| Mounting Type | Surface Mount |
| CAN Module | Yes (CAN 2.0B) |
PIC18C858T-E/PT Pin Configuration
| Pin 1 | RC0/T1OSO/T1CKI — PORTC I/O / Timer1 oscillator output / Timer1 clock input |
| Pin 2 | RC1/T1OSI/CCP2 — PORTC I/O / Timer1 oscillator input / Capture Compare PWM 2 |
| Pin 3 | RC2/CCP1 — PORTC I/O / Capture Compare PWM 1 |
| Pin 4 | RC3/SCK/SCL — PORTC I/O / SPI clock / I2C clock |
| Pin 5 | RC4/SDI/SDA — PORTC I/O / SPI data in / I2C data |
| Pin 6 | RC5/SDO — PORTC I/O / SPI data out |
| Pin 7 | RC6/TX/CK — PORTC I/O / USART TX / USART clock |
| Pin 8 | RC7/RX/DT — PORTC I/O / USART RX / USART data |
| Pin 9 | RD0/PSP0 — PORTD I/O / Parallel Slave Port bit 0 |
| Pin 10 | RD1/PSP1 — PORTD I/O / Parallel Slave Port bit 1 |
| Pin 11 | RD2/PSP2 — PORTD I/O / Parallel Slave Port bit 2 |
| Pin 12 | RD3/PSP3 — PORTD I/O / Parallel Slave Port bit 3 |
| Pin 13 | RD4/PSP4 — PORTD I/O / Parallel Slave Port bit 4 |
| Pin 14 | RD5/PSP5 — PORTD I/O / Parallel Slave Port bit 5 |
| Pin 15 | RD6/PSP6 — PORTD I/O / Parallel Slave Port bit 6 |
| Pin 16 | RD7/PSP7 — PORTD I/O / Parallel Slave Port bit 7 |
| Pin 17 | VSS — Ground |
| Pin 18 | VDD — Positive supply |
| Pin 19 | RB0/INT0 — PORTB I/O / External interrupt 0 |
| Pin 20 | RB1/INT1 — PORTB I/O / External interrupt 1 |
| Pin 21 | RB2/INT2 — PORTB I/O / External interrupt 2 |
| Pin 22 | RB3/INT3 — PORTB I/O / External interrupt 3 / ICSP PGM |
| Pin 23 | RB4/INT4 — PORTB I/O / External interrupt 4 |
| Pin 24 | RB5/INT5 — PORTB I/O / External interrupt 5 |
| Pin 25 | RB6/INT6 — PORTB I/O / External interrupt 6 / ICSP PGC |
| Pin 26 | RB7/INT7 — PORTB I/O / External interrupt 7 / ICSP PGD |
| Pin 27 | RE0/RD/AN5 — PORTE I/O / Parallel Slave Port read / analog ch5 |
| Pin 28 | RE1/WR/AN6 — PORTE I/O / Parallel Slave Port write / analog ch6 |
| Pin 29 | RE2/CS/AN7 — PORTE I/O / Parallel Slave Port chip select / analog ch7 |
| Pin 30 | RE3/PGM — PORTE I/O / LVP programming |
| Pin 31 | RF0/AN8 — PORTF I/O / analog ch8 |
| Pin 32 | RF1/AN9 — PORTF I/O / analog ch9 |
| Pin 33 | RF2/AN10/CVREF — PORTF I/O / analog ch10 / comparator VREF |
| Pin 34 | RF3/AN11 — PORTF I/O / analog ch11 |
| Pin 35 | RF4/AN12 — PORTF I/O / analog ch12 |
| Pin 36 | RF5/AN13 — PORTF I/O / analog ch13 |
| Pin 37 | RF6/AN14 — PORTF I/O / analog ch14 |
| Pin 38 | RF7/AN15 — PORTF I/O / analog ch15 |
| Pin 39 | RG0 — PORTG I/O |
| Pin 40 | RG1 — PORTG I/O |
| Pin 41 | RG2 — PORTG I/O |
| Pin 42 | RG3 — PORTG I/O |
| Pin 43 | RG4 — PORTG I/O |
| Pin 44 | RG5 — PORTG I/O |
| Pin 45 | RG6 — PORTG I/O |
| Pin 46 | RG7 — PORTG I/O |
| Pin 47 | RH0 — PORTH I/O |
| Pin 48 | RH1 — PORTH I/O |
| Pin 49 | RH2 — PORTH I/O |
| Pin 50 | RH3 — PORTH I/O |
| Pin 51 | RH4 — PORTH I/O |
| Pin 52 | RH5 — PORTH I/O |
| Pin 53 | RH6 — PORTH I/O |
| Pin 54 | RH7 — PORTH I/O |
| Pin 55 | RA0/AN0 — PORTA I/O / analog ch0 |
| Pin 56 | RA1/AN1 — PORTA I/O / analog ch1 |
| Pin 57 | RA2/AN2/VREF- — PORTA I/O / analog ch2 / VREF- |
| Pin 58 | RA3/AN3/VREF+ — PORTA I/O / analog ch3 / VREF+ |
| Pin 59 | RA4/T0CKI — PORTA I/O / Timer0 clock |
| Pin 60 | RA5/SS/AN4 — PORTA I/O / SPI slave select / analog ch4 |
| Pin 61 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Pin 62 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Pin 63 | CANTX — CAN bus transmit (if CAN module active) |
| Pin 64 | CANRX — CAN bus receive (if CAN module active) |
| Pin 65 | VSS — Ground |
| Pin 66 | VDD — Positive supply |
| Pin 67 | MCLR/VPP — Master clear reset / programming voltage |
| Pin 68 | NC — Not connected |
| Pin 69 | NC — Not connected |
| Pin 70 | RJ0 — PORTJ I/O |
| Pin 71 | RJ1 — PORTJ I/O |
| Pin 72 | RJ2 — PORTJ I/O |
| Pin 73 | RJ3 — PORTJ I/O |
| Pin 74 | RJ4 — PORTJ I/O |
| Pin 75 | RJ5 — PORTJ I/O |
| Pin 76 | RJ6 — PORTJ I/O |
| Pin 77 | RJ7 — PORTJ I/O |
| Pin 78 | NC — Not connected |
| Pin 79 | VSS — Ground |
| Pin 80 | VDD — Positive supply |
Typical Applications
PIC18C858T-E/PT is suitable for 6 applications: Automotive Body Control Modules, Industrial CAN Sensor Nodes, HVAC Building Automation Controllers, Medical Monitoring Devices, Automotive Instrument Clusters, CAN-Based Elevator Control Nodes.
Automotive Body Control Modules
The PIC18C858T-E/PT's integrated CAN 2.0B controller and 68 I/O pins make it a strong fit for automotive body control modules that aggregate switch inputs, drive relays and LEDs, and communicate on the vehicle CAN bus. Its automotive -40 C to +125 C temperature grade supports underhood and cabin environments, while the 10 MIPS core handles CAN bit-timing, debounced switch scanning, and PWM-driven lamp dimming concurrently. Engineers designing BCMs should pair this MCU with a CAN transceiver such as MCP2551 and verify the OTP memory constraint matches the production firmware strategy. For new BCM designs the flash-based PIC18F8525 is the recommended modern successor.
Recommended
Industrial CAN Sensor Nodes
For industrial sensor nodes requiring CAN connectivity, the PIC18C858T-E/PT provides a single-chip solution: CAN controller, ADC channels for analog sensor reading, MSSP for SPI sensor interfacing, and 68 I/O for digital I/O mapping. The 40 MHz core executes the CANopen or DeviceNet stack while still servicing periodic sensor sampling at typical 10 ms loops. Industrial designers benefit from -40 C to +125 C temperature margin for factory-floor environments. The 32 KB OTP code space accepts the full CANopen stack plus application-specific sensor processing. Use MCP2515 external CAN controller only if CAN isolation requirements exceed the integrated module's capabilities.
Recommended
HVAC Building Automation Controllers
Building HVAC and automation controllers benefit from the PIC18C858T-E/PT's 68 I/O for multi-zone thermostat panels, integrated CAN for network backbone communication, and the wide operating temperature that handles mechanical rooms and rooftop units. The 10 MIPS throughput runs PID loops for damper and valve actuators while maintaining CAN traffic with the central building management system. Analog inputs read temperature/humidity sensors through the on-chip ADC; PWM outputs drive triac-fired heaters or 0-10V actuators. New HVAC designs should consider PIC18F8525 for flash-based firmware updates over the building network.
Recommended
Medical Monitoring Devices
Medical patient monitoring and diagnostic peripherals can use the PIC18C858T-E/PT where cost-sensitive multi-channel designs require 8-bit processing and CAN-based inter-module communication. The 68 I/O counts accommodate multi-lead ECG front ends, while the integrated ADC captures vital-sign waveforms. The automotive-grade temperature margin is overkill for clinical settings but provides reliability headroom for sterilizable equipment housings. Note: medical designs should evaluate whether PIC18C's OTP memory constraint is acceptable, given FDA firmware-change controls that benefit from flash reprogrammability. PIC18F-series flash parts are generally preferred for new medical designs.
Recommended
Automotive Instrument Clusters
Instrument clusters with mechanical or simple LCD gauge displays leverage the PIC18C858T-E/PT's 68 I/O for driving multiple stepper motors or segment-style displays while maintaining CAN communication with the vehicle network. The -40 C to +125 C range handles dash-top thermal exposure from direct sunlight, and the 40 MHz core can multiplex drive a typical 40-segment gauge cluster at acceptable refresh rates. Stepper motor drive signals and backlight PWM dimming are handled directly from GPIO pins, eliminating external driver ICs for low-power clusters. Modern cluster designs with color TFT displays need more RAM and should move to PIC18F or higher-end MCU families.
Recommended
CAN-Based Elevator Control Nodes
Elevator and access-control CAN nodes use the PIC18C858T-E/PT to manage floor-call buttons, door sensors, and safety interlock inputs while networking with the elevator controller over CAN. The 68 I/O accommodates multi-floor installations, the CAN module provides deterministic communication with the master controller, and the OTP memory suits safety-certified production runs where firmware does not change post-certification. Safety-critical designs must verify compliance with EN 81 and related elevator safety standards before deployment. The -40 to +125 C range covers machine-room heat rise and shaftway cold extremes.
Recommended
Recommended Products Summary
Engineering reference data for PIC18C858T-E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F8525-I/PT | PIC18C858-E/PT |
|---|---|---|---|
| Package | 80-TQFP (PT) 12x12 mm | 80-TQFP (PT) 12x12 mm - same footprint | 80-TQFP (PT) 12x12 mm - same footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 32 KB OTP | 48 KB Flash (reprogrammable) | 32 KB OTP (same) |
| Temperature Range | -40 C to +125 C (automotive -E) | -40 C to +125 C | -40 C to +85 C (industrial) |
| Lifecycle Status | Obsolete | Active | Obsolete |
| Max Clock Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| CAN Module | Integrated CAN 2.0B | Integrated CAN 2.0B | Integrated CAN 2.0B |
| I/O Pins | 68 | 68 | 68 |
Key Differentiators
- Integrated CAN 2.0B controller on chip (vs PIC18F8525-I/PT)
- Automotive-grade -40 to +125 C operation (vs PIC18C858-E/PT)
- Tape & Reel production packaging (vs PIC18C858-E/PT)
Design Notes
PIC18C858T-E/PT uses OTP (One-Time-Programmable) program memory, which is not erasable. After programming, firmware cannot be modified without throwing away the chip. Prototype every firmware revision on a flash-based PIC18F8525 (same 80-TQFP package) before committing to OTP production, otherwise firmware bugs discovered during validation become expensive per-unit losses. Designers should also note that PIC18C858 was officially declared obsolete with Microchip's recommendation to migrate to PIC18F8525, so OTP supply is limited to legacy inventory.
The PIC18C858T-E/PT requires stable VDD decoupling for ADC accuracy and CAN bus reliability. Place one 100 nF ceramic bypass capacitor as close as possible to each VDD/VSS pair, plus a single 10 uF tantalum or low-ESR ceramic bulk capacitor at the power-entry pin. CAN bus noise on VDD can cause CAN error-frame storms; if the supply rail is shared with inductive loads (relays, motors), add additional isolation filtering. Estimated: at 40 MHz and 5 V typical operating current is ~25 mA, requiring decoupling effective at frequencies from DC to 40 MHz harmonics.
The 80-pin TQFP package has 0.5 mm lead pitch, requiring fine-pitch PCB land patterns and either reflow soldering or hot-bar soldering for prototype assembly. Use ENIG (gold) finish on the PCB pads to ensure reliable fine-pitch soldering over the part's automotive -40 to +125 C temperature range. Route CAN traces with characteristic impedance matching for the bus speed (typically 120 ohm termination at each end) and keep CAN traces short and away from switching power or motor traces to maintain signal integrity.
Compliance Information
RoHS, REACH, and AEC-Q100 status not present in provided web data; lead-free indicated by Microchip part numbering convention. Verify compliance via Microchip's product environmental compliance reports before committing to automotive or EU-market designs.
