PIC18C658-I/PT - 8-bit 40MHz 32KB OTP MCU w/CAN | Microchip
MPN: PIC18C658-I/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.1 | $9.10 |
| 10 | $8.19 | $81.90 |
| 100 | $7.27 | $727.00 |
| 500 | $6.36 | $3,180.00 |
| 1,000 | $5.45 | $5,450.00 |
PIC18C658-I/PT Overview
What is an 8-bit OTP microcontroller? An OTP MCU is a microcontroller whose program memory can be written once during production programming, after which the code becomes permanent - similar to a masked-ROM device but with the flexibility of late-stage firmware customization. Within the broader taxonomy, this places PIC18C658 in the 8-bit MCU -> PIC microcontroller -> microcontroller -> embedded processing IC hierarchy. The integrated CAN module makes it specifically a "MCU with on-board communication peripheral," sitting at the intersection of general-purpose control and automotive/industrial networking silicon.
Key differentiating features include a 40 MHz maximum clock speed (10 MIPS throughput), an enhanced 16-bit instruction set with 77 instructions, a 10-bit ADC, three timers, a USART, an MSSP (SPI/I2C) port, and the integrated CAN 2.0B module. The OTP memory suits low-volume production runs and field-programmable prototypes where mask-ROM tooling costs are prohibitive. The 64-pin TQFP package exposes enough I/O for human-interface panels, multi-drop sensor arrays, and CAN bus nodes.
Architecturally, the PIC18C658 employs a Harvard architecture with separate program and data buses, an 8-bit ALU, and a hardware multiplier for single-cycle 8x8 operations. The integrated CAN engine handles full CAN 2.0B active frame transmission/reception with three transmit and two receive buffers, offloading the CPU from bit-level protocol work and enabling deterministic network behaviour.
Typical applications include automotive body and chassis networks (CAN nodes for window/lights/seat modules), industrial CANopen/J1939 slave nodes, building automation (HVAC controllers, lighting gateways), embedded control with on-chip networking, and low-volume OEM instrumentation. The industrial temperature range (-40°C to +85°C, "I" suffix) supports factory-floor and automotive under-hood environments.
When designing with PIC18C658-I/PT, ensure OTP programming is performed before final board assembly using a Microchip MPLAB PM3 or ICD2 programmer. Because OTP cannot be erased, firmware verification (read-back compare) is mandatory before bulk programming. For new designs, evaluate the flash-based PIC18F6585 as a more flexible alternative.
This page consolidates distributor pricing, drop-in same-package alternatives, application-specific design notes, and parametric comparisons not aggregated on any single distributor page - an information-gain reference for engineers evaluating, sourcing, or replacing this legacy Microchip MCU.
Drop-in alternatives for PIC18C658-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 PIC18C658-I/PT (same form factor and footprint) — differing in Core Architecture, Package, Program Memory Size, Program Memory Type, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F6585-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F6680-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18C858-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$9.95 / Unit
View Datasheet →PIC18C601-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.08 / Unit
View Datasheet →PIC18C658-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit (Harvard) |
| Family | PIC® 18C |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM | 1536 bytes |
| Maximum Clock Frequency | 40 MHz |
| Instruction Throughput | 10 MIPS |
| Operating Voltage | 5 V |
| I/O Pins | 52 |
| ADC | 10-bit (channels not in verified data) |
| Timers | 3 (per datasheet family) |
| Communication Interfaces | CAN 2.0B, USART, MSSP (SPI/I2C) |
| Package | 64-pin TQFP (10x10 mm) |
| Operating Temperature | -40C to +85C (Industrial, "I" suffix) |
| Mounting Type | Surface Mount |
PIC18C658-I/PT Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input |
| Pin 2 | OSC1 — Oscillator input |
| Pin 3 | OSC2 — Oscillator output |
| Pin 4 | RA0/AN0 — PORTA bit 0 / ADC input 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / ADC input 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / ADC input 2 |
| Pin 7 | RA3/AN3 — PORTA bit 3 / ADC input 3 |
| Pin 8 | RA4/TOCKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — PORTA bit 5 / ADC input 4 / SPI slave select |
| Pin 10 | VSS — Ground |
| Pin 11 | VDD — Positive supply (5 V) |
| Pin 12 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 13 | RB1 — PORTB bit 1 |
| Pin 14 | RB2 — PORTB bit 2 |
| Pin 15 | RB3 — PORTB bit 3 |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5 — PORTB bit 5 |
| Pin 18 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 19 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 20 | VSS — Ground |
| Pin 21 | VDD — Positive supply (5 V) |
| Pin 22 | RC0/T1CKI — PORTC bit 0 / Timer1 clock input |
| Pin 23 | RC1/CCP2 — PORTC bit 1 / Capture/Compare/PWM 2 |
| Pin 24 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| Pin 25 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 26 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 27 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 28 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 29 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 30 | VSS — Ground |
| Pin 31 | VDD — Positive supply (5 V) |
| Pin 32 | RD0 — PORTD bit 0 |
| Pin 33 | RD1 — PORTD bit 1 |
| Pin 34 | RD2 — PORTD bit 2 |
| Pin 35 | RD3 — PORTD bit 3 |
| Pin 36 | RD4 — PORTD bit 4 |
| Pin 37 | RD5 — PORTD bit 5 |
| Pin 38 | RD6 — PORTD bit 6 |
| Pin 39 | RD7 — PORTD bit 7 |
| Pin 40 | VSS — Ground |
| Pin 41 | VDD — Positive supply (5 V) |
| Pin 42 | RE0/RD — PORTE bit 0 / parallel slave port read |
| Pin 43 | RE1/WR — PORTE bit 1 / parallel slave port write |
| Pin 44 | RE2/CS — PORTE bit 2 / parallel slave port chip select |
| Pin 45 | RE3 — PORTE bit 3 |
| Pin 46 | CANTX — CAN transmit output (to transceiver) |
| Pin 47 | CANRX — CAN receive input (from transceiver) |
| Pin 48 | VDD — Positive supply (5 V) |
| Pin 49 | VSS — Ground |
| Pin 50 | RF0 — PORTF bit 0 |
| Pin 51 | RF1 — PORTF bit 1 |
| Pin 52 | RF2 — PORTF bit 2 |
| Pin 53 | RF3 — PORTF bit 3 |
| Pin 54 | RF4 — PORTF bit 4 |
| Pin 55 | RF5 — PORTF bit 5 |
| Pin 56 | RF6 — PORTF bit 6 |
| Pin 57 | RF7 — PORTF bit 7 |
| Pin 58 | RG0 — PORTG bit 0 |
| Pin 59 | RG1 — PORTG bit 1 |
| Pin 60 | RG2 — PORTG bit 2 |
| Pin 61 | RG3 — PORTG bit 3 |
| Pin 62 | RG4 — PORTG bit 4 |
| Pin 63 | VSS — Ground |
| Pin 64 | VDD — Positive supply (5 V) |
Typical Applications
PIC18C658-I/PT is suitable for 6 applications: Automotive CAN Body Electronics, Industrial CANopen Slave Nodes, Building Automation Gateways, Embedded Sensor Hubs with CAN Connectivity, Low-Volume OEM Instrumentation, CAN-Based Motor Control Nodes.
Automotive CAN Body Electronics
The PIC18C658-I/PT's integrated CAN 2.0B controller with three transmit and two receive buffers makes it suitable for automotive body electronics nodes such as window lift, seat control, lighting modules, and mirror actuators. Operating from a 5 V supply and industrial -40C to +85C temperature range, it tolerates cabin and trunk-mounted environments. The 52 I/O pins can drive relay coils, read switch positions, and PWM LEDs directly, while the CAN engine offloads bus protocol from the CPU for deterministic 125 kbps to 1 Mbps network behaviour.
Recommended
Industrial CANopen Slave Nodes
For factory-automation CANopen networks, the PIC18C658-I/PT provides the CAN 2.0B hardware backbone needed to implement slave-node profiles (DS301/DS401). The 32 KB OTP program memory holds CANopen stack and application firmware for sensor/actuator nodes; the 1536 bytes RAM supports PDO/SDO buffering. The 40 MHz / 10 MIPS core executes protocol state machines with headroom, while the 10-bit ADC reads analog sensor inputs. Note: OTP memory requires final firmware lock-in at production - flash-based PIC18F6585 is preferred for late-stage protocol changes.
Recommended
Building Automation Gateways
In HVAC controllers, lighting gateways, and access-control panels, the PIC18C658-I/PT serves as the local supervisory MCU bridging CAN-bus building networks with local I/O. The 52 I/O can scan keypads, drive triac outputs for lighting dimmers, read thermistor inputs, and control damper motors. The integrated CAN module enables BACnet/MS-TP to CAN bridging or LonWorks-to-CAN protocol translation. The 64-pin TQFP package suits 4-layer control board designs with adequate grounding for EMI-sensitive analog sensor front-ends.
Recommended
Embedded Sensor Hubs with CAN Connectivity
The PIC18C658-I/PT's combination of 10-bit ADC, 52 I/O, and CAN 2.0B makes it a fit for distributed sensor hubs that aggregate analog/digital signals and broadcast them over a CAN bus to a central controller. Typical deployments include machine-vision illumination controllers, multi-zone temperature transmitters, and hydraulic pressure monitoring nodes. The 32 KB OTP program memory holds device firmware plus calibration constants; the industrial temperature range suits outdoor and cabinet-mounted installations.
Recommended
Low-Volume OEM Instrumentation
For low-volume OEM products (annual production hundreds to a few thousand units), the PIC18C658-I/PT's OTP memory eliminates the mask-ROM NRE charges that flash-killed RISC MCUs would also avoid, while keeping the cost-of-programming low with a single MPLAB PM3 production run. The PIC18 instruction set is well-documented and supported by MPLAB X IDE, accelerating firmware development. Typical instruments include laboratory data loggers, custom test fixtures, and specialized medical monitoring peripherals where CAN networking simplifies multi-instrument synchronization.
Recommended
CAN-Based Motor Control Nodes
The PIC18C658-I/PT can act as a CAN-connected brushless DC or stepper motor controller node, with three on-chip timers providing PWM generation, capture/compare for feedback, and a tick timer for commutation. The integrated CAN bus allows centralized motion controllers to command torque, speed, and position profiles to many distributed motor nodes over a single twisted pair. The 5 V supply and industrial temperature range suit machine-tool and packaging-equipment environments; the 52 I/O enables parallel multi-axis control from a single MCU.
Recommended
Recommended Products Summary
Engineering reference data for PIC18C658-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F6585-I/PT | PIC18F6680-I/PT | PIC18C601-I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (10x10) | TQFP-64 (10x10) - same | TQFP-64 (10x10) - same | TQFP-64 (10x10) - same |
| Core / Architecture | PIC18C, 8-bit, 40 MHz | PIC18F, 8-bit, 40 MHz - same core | PIC18F, 8-bit, 40 MHz - same core | PIC18C, 8-bit, 40 MHz - same core |
| Memory Type | OTP (write-once) | Flash (rewritable) | Flash (rewritable) | OTP (write-once) |
| CAN Module | CAN 2.0B integrated | CAN 2.0B integrated - same | CAN 2.0B integrated - same | No CAN module |
| I/O Pins | 52 | 52 - same | 52 - same | 52 - same |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Lifecycle Status | Obsolete (PIC18C family EOL) | Active (flash successor) | Active (flash successor) | Obsolete (same PIC18C family) |
Key Differentiators
- Integrated CAN 2.0B controller on-chip (vs PIC18C601-I/PT)
- Flash memory for in-field firmware updates (vs PIC18F6585-I/PT)
- Higher program memory density (vs PIC18F6680-I/PT)
Design Notes
OTP memory can be written only once - there is no erase operation. Perform read-back verification with the MPLAB PM3 programmer after every production OTP burn to detect bit failures, and complete all firmware development on a flash-based equivalent (PIC18F6585) before committing to OTP. A single OTP write error scrapping a programmed part cannot be undone in-circuit.
The TQFP-64 (10x10 mm) package requires a 4-layer PCB with a continuous ground plane beneath the die for EMI and thermal performance. Place the MCP2551 CAN transceiver within 25 mm of the CANTX/CANRX pins (pins 46/47) and route the differential CAN bus traces with 120-ohm characteristic impedance and matched lengths. Decouple each VDD pin (11, 21, 31, 41, 48, 64) with a 100 nF ceramic capacitor plus a 10 uF bulk capacitor at the package entry.
The PIC18C658-I/PT operates from a single 5 V supply. Estimated supply current at 40 MHz with CAN active is approximately 25-35 mA; add 5-8 mA per output pin driving a 20 mA LED load. A MCP130 voltage supervisor or RC reset on MCLR (pin 1) is recommended for industrial environments to prevent brown-out code execution. The internal POR (power-on reset) is enabled by configuration fuses but should be supplemented with an external reset circuit for noisy CAN bus environments.
Estimated: At continuous 40 MHz operation, ambient +25C, the PIC18C658-I/PT dissipates approximately 0.15 W internal power. The TQFP-64 (10x10) has theta_JA of approximately 50 C/W on a 4-layer JEDEC test board, giving a junction-to-ambient rise of about 7.5 C - well within the -40C to +85C industrial range. No external heatsink required; however, a continuous ground plane on the top and bottom layers is essential to achieve the rated theta_JA.
Compliance Information
Compliance data not found in verified web data. PIC18C family predates widespread RoHS adoption; many PIC18C658-I/PT variants are non-RoHS. AEC-Q100 qualification not applicable for industrial-grade 8-bit MCU; automotive designs should select PIC18F6680 with AEC-Q100 grade.
