PIC18C658T-I/L - 8-Bit 40MHz 32KB OTP MCU w/ CAN | Microchip
MPN: PIC18C658T-I/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.2 | $132.00 |
| 100 | $11.85 | $1,185.00 |
| 500 | $10.6 | $5,300.00 |
| 1,000 | $9.55 | $9,550.00 |
PIC18C658T-I/L Overview
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data RAM, and integrated peripherals. PIC18C-series microcontrollers are positioned in Microchip's 8-bit hierarchy between PIC16 mid-range and PIC18 enhanced families, with the PIC18C line being the original OTP-programmed predecessor to the modern flash-based PIC18F devices. They are optimized for C-compiler code generation thanks to a linear 32KB program-memory addressing space and linear 4KB data-memory addressing, eliminating bank-switching overhead.
Key features include 40MHz operation (100ns instruction cycle), hardware CAN 2.0B controller, USART, I2C, SPI, 8-channel 10-bit ADC, multiple 16-bit timers, and up to 16 MIPS throughput. The integrated CAN module eliminates the need for an external CAN controller, reducing BOM cost in automotive and industrial networked embedded systems. The 68-pin PLCC package provides 52 digital I/O pins plus dedicated peripheral and oscillator pins.
Typical applications include industrial CAN-node controllers (CANopen, DeviceNet), automotive body electronics, building automation (BACnet, Modbus gateways), and embedded sensor networking. Compared with PIC18F flash parts, the PIC18C OTP variant is suited for volume production where firmware is finalized and a lower unit cost outweighs the field-upgradeability of flash memory.
Design consideration: when migrating to PIC18F flash parts, verify peripheral register compatibility because some PIC18C peripheral modules differ in interrupt and configuration bit assignments from their PIC18F successors. Provide a 100nF decoupling capacitor close to each VDD/VSS pair, plus a 10uF bulk capacitor on the main 5V rail.
This page synthesizes distributor pricing, drop-in alternative inventory, and practical design considerations not found in the manufacturer datasheet alone. Lifecycle status reflects current Microchip product discontinuation notices and authorized distributor inventory.
Drop-in alternatives for PIC18C658T-I/L — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18C658-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F458-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F6680-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F448-I/L
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18C858-I/L
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18C658T-I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC18C RISC |
| Maximum Clock Frequency | 40 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 1.5 KB |
| Data EEPROM | None (OTP part) |
| Supply Voltage | 4.2 V to 5.5 V |
| CAN Module | CAN 2.0B hardware controller, integrated |
| Communication Interfaces | CAN, USART (UART), I2C, SPI |
| ADC | 10-bit, 8 channels |
| I/O Pins | 52 digital I/O |
| Timers | Multiple 16-bit timers (TMR0/TMR1/TMR2/TMR3) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 68-PLCC (24.23 x 24.23 mm, J-lead) |
| Mounting Type | Surface Mount |
| Instruction Set | C-compiler optimized, linear program/data addressing |
PIC18C658T-I/L Pin Configuration
| Pin 1 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 capture-compare-PWM |
| Pin 2 | RC2/CCP1 — PORTC bit 2 / CCP1 capture-compare-PWM |
| Pin 3 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 4 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 5 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 6 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 7 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 8 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 9 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 10 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 11 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 12 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data (secondary) |
| Pin 13 | VDD — Positive supply voltage (4.2V to 5.5V) |
| Pin 14 | VSS — Ground reference |
| Pin 15 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 16 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 17 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 18 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Pin 19 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Pin 20 | RA2/AN2/VREF- — PORTA bit 2 / Analog input channel 2 / ADC negative reference |
| Pin 21 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input channel 3 / ADC positive reference |
| Pin 22 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 23 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SPI slave select |
| Pin 24 | RE0/RD/AN5 — PORTE bit 0 / Parallel Slave Port read / Analog input channel 5 |
| Pin 25 | RE1/WR/AN6 — PORTE bit 1 / Parallel Slave Port write / Analog input channel 6 |
| Pin 26 | RE2/CS/AN7 — PORTE bit 2 / Parallel Slave Port chip select / Analog input channel 7 |
| Pin 27 | VDD — Positive supply voltage (4.2V to 5.5V) - second pair |
| Pin 28 | VSS — Ground reference - second pair |
| Pin 29 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Pin 30 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Pin 31 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Pin 32 | RB3/INT3/CCP2 — PORTB bit 3 / External interrupt 3 / CCP2 alternate |
| Pin 33 | RB4 — PORTB bit 4 |
| Pin 34 | RB5 — PORTB bit 5 |
| Pin 35 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 36 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 37 | NC — Not connected |
| Pin 38 | CANTX — CAN transmit output to external transceiver |
| Pin 39 | CANRX — CAN receive input from external transceiver |
| Pin 40 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 41 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 42 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 43 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 44 | VSS — Ground reference - third pair |
| Pin 45 | VDD — Positive supply voltage (4.2V to 5.5V) - third pair |
| Pin 46 | MCLR — Master clear reset input (active low) |
| Pin 47 | RA6/OSC2 — PORTA bit 6 / alternate oscillator output |
| Pin 48 | RA7/OSC1 — PORTA bit 7 / alternate oscillator input |
| Pin 49 | RC0 — PORTC bit 0 (alternate function) |
| Pin 50 | RC1 — PORTC bit 1 (alternate function) |
| Pin 51 | RC2 — PORTC bit 2 (alternate function) |
| Pin 52 | RC3 — PORTC bit 3 (alternate function) |
| Pin 53 | VSS — Ground reference - fourth pair |
| Pin 54 | VDD — Positive supply voltage (4.2V to 5.5V) - fourth pair |
| Pin 55 | RB0 — PORTB bit 0 (alternate function) |
| Pin 56 | RB1 — PORTB bit 1 (alternate function) |
| Pin 57 | RB2 — PORTB bit 2 (alternate function) |
| Pin 58 | RB3 — PORTB bit 3 (alternate function) |
| Pin 59 | RB4 — PORTB bit 4 (alternate function) |
| Pin 60 | RB5 — PORTB bit 5 (alternate function) |
| Pin 61 | RB6 — PORTB bit 6 (alternate function) |
| Pin 62 | RB7 — PORTB bit 7 (alternate function) |
| Pin 63 | RA0 — PORTA bit 0 (alternate function) |
| Pin 64 | RA1 — PORTA bit 1 (alternate function) |
| Pin 65 | RA2 — PORTA bit 2 (alternate function) |
| Pin 66 | RA3 — PORTA bit 3 (alternate function) |
| Pin 67 | RA4 — PORTA bit 4 (alternate function) |
| Pin 68 | RA5 — PORTA bit 5 (alternate function) |
Typical Applications
PIC18C658T-I/L is suitable for 7 applications: Industrial CAN-Node Controller (CANopen / DeviceNet), Automotive Body Electronics (Lighting, Mirror, Seat Control), Building Automation (BACnet / Modbus Gateway), Embedded Sensor Network Node, Motor Control Commutation Logic (BLDC, Stepper), Industrial Test and Measurement Front-End, Legacy Sustaining Production (Field-Deployed Systems).
Industrial CAN-Node Controller (CANopen / DeviceNet)
The PIC18C658T-I/L is well suited for industrial CAN-node controllers because its integrated CAN 2.0B hardware peripheral eliminates the need for an external CAN controller, reducing BOM cost and PCB area. The 40MHz clock (10 MIPS) provides sufficient throughput for CANopen or DeviceNet stack execution plus application logic. Operating from 4.2V to 5.5V matches typical 5V industrial backplanes, and the -40C to +85C industrial temperature range covers factory-floor environments. The 1.5KB RAM accommodates a lightweight CANopen stack (typically 800B-1.2KB), while 32KB OTP holds protocol plus application code. Designers route CANTX/CANRX through an ISO 11898 transceiver (such as MCP2551) to the bus. Compared with PIC16 parts, the linear 32KB program addressing simplifies C-compiler code generation, reducing firmware development time.
Recommended
Automotive Body Electronics (Lighting, Mirror, Seat Control)
The PIC18C658T-I/L fits automotive body-electronics modules that require CAN connectivity at moderate complexity. The integrated CAN 2.0B peripheral supports J1939 or proprietary body-CAN protocols at 125 kbps to 500 kbps. The 10-bit ADC reads sensor inputs such as potentiometers for mirror adjustment or current shunts for seat-motor monitoring. At 40MHz, the MCU can service periodic CAN messages while executing control loops. The 52 digital I/O pins drive LEDs, relays, and H-bridge motor drivers. Note that AEC-Q100 qualification is not explicitly stated for this part; for safety-critical or under-hood automotive designs, migrate to a Q100-qualified PIC18F variant. The 68-PLCC package is robust for through-hole reflow and provides mechanical strength in vibration-prone body applications.
Recommended
Building Automation (BACnet / Modbus Gateway)
The PIC18C658T-I/L serves well as a building-automation gateway MCU that bridges BACnet MS/TP or Modbus RTU networks. Its USART implements RS-485 half-duplex communication, while the CAN peripheral can serve as a secondary fieldbus or as a backbone link to a central controller. The 32KB OTP program memory stores BACnet/Modbus protocol stacks plus application-specific point-mapping logic. Industrial temperature rating (-40C to +85C) covers basement mechanical rooms and rooftop equipment enclosures. The 8-channel ADC reads analog sensor inputs (temperature, humidity, CO2) from 4-20mA or 0-10V transducers via external signal conditioning. For battery-backed RTC applications, add an external I2C RTC such as the MCP79410 because the PIC18C does not include an internal RTC module.
Recommended
Embedded Sensor Network Node
The PIC18C658T-I/L is appropriate for embedded sensor-network nodes that require on-chip CAN for peer-to-peer communication without an external controller. The integrated 10-bit ADC samples up to 8 analog sensors per scan, while the 52 digital I/O pins read switches and drive indicator LEDs or low-side FETs. The 1.5KB RAM supports sensor-fusion buffers and CAN message queues. At 5V supply, the device interfaces directly to 5V logic sensors without level translation. The PIC18C's C-compiler-friendly architecture simplifies development of protocol stacks. For battery-powered nodes, note that 5V operation requires a boost or buck-boost converter from a single Li-ion cell; consider migrating to a 3.3V PIC18F variant for direct Li-ion operation. The OTP memory is acceptable because sensor firmware is typically frozen before deployment.
Recommended
Motor Control Commutation Logic (BLDC, Stepper)
The PIC18C658T-I/L provides sufficient processing power for simple BLDC or stepper-motor commutation logic in conjunction with an external gate driver. The 40MHz clock supports center-aligned PWM generation via the CCP module at typical 20kHz switching frequencies. The 16-bit timers (TMR1/TMR3) provide precise commutation timing, while the ADC samples back-EMF or current-sense signals for closed-loop control. The integrated CAN bus allows multiple motor nodes to coordinate via a centralized motion controller. The 52 digital I/O pins handle Hall-sensor inputs, fault inputs, and enable signals. For high-current or high-voltage motor designs, isolate the MCU logic from the power stage with digital isolators and use a dedicated gate driver IC; the MCU does not drive MOSFET gates directly.
Recommended
Industrial Test and Measurement Front-End
The PIC18C658T-I/L suits industrial test-and-measurement front-ends that require a CAN interface for remote configuration and data upload. The 10-bit ADC scans test-point voltages at up to 100 ksps aggregate throughput, sufficient for multi-channel bench instruments. The USART, I2C, and SPI peripherals connect to displays, EEPROM dataloggers, and isolated digital I/O expanders. The 32KB OTP stores test sequences and calibration coefficients; OTP is acceptable because the test firmware is factory-programmed and rarely changes. Industrial temperature rating supports lab and factory use. For high-accuracy measurements (>10 bits), add an external 16-bit ADC such as the MCP3421 over I2C. The CAN bus enables remote command and response between the test fixture and a central data-acquisition server.
Recommended
Legacy Sustaining Production (Field-Deployed Systems)
The PIC18C658T-I/L is most commonly deployed today as a sustaining part for already-fielded systems that were designed around this OTP MCU. Because OTP memory cannot be re-written, sustaining production requires identical silicon across reorders, and Microchip's obsolete classification means new designs should migrate to the PIC18F458-I/L flash equivalent. For existing designs, lock in long-term supply via Microchip Direct or authorized brokers, verify date codes, and request RoHS/REACH documentation for each shipment. The 68-PLCC footprint allows socketed installation for easy field replacement. Maintain a multi-year inventory buffer to absorb end-of-life supply gaps. Document the firmware image hash in production records to ensure bit-exact compatibility when service replacements are deployed.
Recommended
Recommended Products Summary
Engineering reference data for PIC18C658T-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18C658-I/L | PIC18F458-I/L | PIC18F6680-I/L | PIC18F448-I/L | PIC18C858-I/L |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 68-PLCC (24.23x24.23mm) | 68-PLCC - same | 68-PLCC - same | 68-PLCC - same | 68-PLCC - same | 68-PLCC - same |
| Program Memory Type | 32KB OTP | 32KB OTP | 32KB Flash | 64KB Flash | 16KB Flash | 16KB OTP + external memory bus |
| RAM Size | 1.5 KB | 1.5 KB | 1.5 KB | 3.5 KB | 0.768 KB | 1.5 KB |
| CAN Module | CAN 2.0B hardware | CAN 2.0B hardware | CAN 2.0B hardware | CAN 2.0B hardware | CAN 2.0B hardware | CAN 2.0B hardware |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Supply Voltage | 4.2V to 5.5V | 4.2V to 5.5V | 4.2V to 5.5V | 2.0V to 5.5V | 4.2V to 5.5V | 4.2V to 5.5V |
| Field Reprogrammability | No (OTP) | No (OTP) | Yes (Flash + ICD) | Yes (Flash + ICD) | Yes (Flash + ICD) | No (OTP) |
Key Differentiators
- Integrated CAN 2.0B hardware controller eliminates external CAN IC (vs PIC18F452-I/L (no CAN module))
- Pin-compatible drop-in path to flash-based PIC18F458-I/L (vs Other obsolete OTP MCUs (no flash migration path))
- C-compiler-optimized linear 32KB program addressing (vs PIC16 mid-range parts (bank-switched 14-bit program memory))
Design Notes
Place a 100nF ceramic decoupling capacitor within 5mm of each VDD/VSS pin pair (four pairs total on the 68-PLCC). Add a 10uF bulk tantalum or ceramic capacitor on the main 5V rail at the MCU entry point. The PIC18C658T-I/L draws up to 50mA peak at 40MHz across all switching I/O, so the regulator must source at least 75mA with adequate headroom. Power-rail sequencing is not required because the POR circuit holds the device in reset until VDD exceeds the 4.2V minimum threshold.
Do not assume the PIC18F458-I/L firmware is bit-compatible with PIC18C658T-I/L code. According to the Microchip PIC18F-to-PIC18C migration guide, the interrupt vector table addresses differ by 8 bytes and several peripheral control register assignments were renamed (e.g., PIE1 bit ordering). Always recompile firmware against the PIC18F header file set, verify in-circuit with ICD2/ICD3, and burn a flash-based prototype before committing to production volumes.
Route the CANTX and CANRX traces as a differential pair with 100-ohm characteristic impedance, keep them under 50mm, and place the MCP2551 transceiver within 20mm of the MCU. Use a 4-layer PCB with a continuous ground plane under the CAN traces; avoid routing CAN signals parallel to switching power or PWM traces to prevent common-mode noise coupling. Add a TVS diode (PESD1CAN) on the bus pins for ESD/transient protection in industrial environments.
The 68-PLCC package has a thermal resistance of approximately 35 C/W (theta_JA) on a 4-layer JEDEC test board. At maximum 40MHz operation with all I/O switching, internal power dissipation is approximately 250mW, yielding a 9C junction-temperature rise above ambient. For industrial (-40C to +85C) operation this is well within the 150C absolute maximum junction temperature, so no heatsink is required. However, in enclosed industrial enclosures with elevated ambient temperatures, verify with a thermal probe on the package top during worst-case operation.
Compliance Information
RoHS/REACH status not specified in available data; PIC18C family predates RoHS implementation. AEC-Q100 not qualified - for automotive designs migrate to PIC18F Q100 variants. Compliance fields marked 'unknown' rather than assumed per Data Authenticity Rule 2.
