PIC18C658-I/PT Equivalent & Substitute Parts

Part Overview

The PIC18C658-I/PT is an 8-bit microcontroller from Microchip Technology's PIC® 18C series, featuring 32KB OTP program memory, 1.5KB RAM, and 52 I/O pins in a 64-TQFP package. This device is actively produced and suitable for embedded applications requiring CANbus, I2C, SPI, and UART/USART connectivity. Finding equivalent or substitute parts may be necessary due to inventory constraints, design optimization, or memory requirement changes in production environments.

Substiute Parts

PIC18C658-I/PT

Microchip TechnologyIn Stock: 1998PIC18C658-I/PT Datasheet

Current PartRFQ

PIC18F6585-I/PT

Microchip TechnologyIn Stock: 7368PIC18F6585-I/PT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC18C658-I/PT is based on strict alignment of the following critical parameters:

• Package compatibility: 64-TQFP (10x10) form factor ensures mechanical and electrical pin compatibility
• Core processor family: PIC architecture maintains instruction set compatibility
• Core size and speed: 8-Bit, 40MHz operation preserves performance characteristics
• I/O count: 52 pins maintain pinout equivalence
• Supply voltage range: 4.2V ~ 5.5V ensures power supply compatibility
• Operating temperature range: -40°C ~ 85°C maintains thermal specifications
• Connectivity interfaces: CANbus, I2C, SPI, UART/USART support identical communication protocols
• Data converter specifications: A/D 12x10b maintains analog input capability

The PIC18F6585-I/PT qualifies as a substitute based on these parameters. Differences in program memory type (OTP vs. FLASH) and memory capacity do not prevent substitution when application requirements permit.

Parameter Comparison

Engineering Selection Recommendations

Both the PIC18C658-I/PT and PIC18F6585-I/PT are active products from Microchip Technology with identical RoHS3 compliance and REACH status. Selection between these devices should be based on application-specific memory requirements:

The PIC18C658-I/PT provides 32KB OTP program memory suitable for fixed-code applications where reprogramming is not required post-manufacture.

The PIC18F6585-I/PT provides 48KB FLASH program memory with in-system reprogrammability, offering greater flexibility for development, field updates, and design iterations. This device also includes 1K x 8 EEPROM and increased RAM (3.25K x 8 versus 1.5K x 8), providing additional storage capacity for runtime data.

Both devices maintain identical pinout, voltage specifications, operating temperature range, and peripheral feature sets, ensuring direct substitution at the board level when memory characteristics align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can the PIC18F6585-I/PT directly replace the PIC18C658-I/PT on an existing PCB?

A: Yes. Both devices use the 64-TQFP (10x10) package with identical pinout, supply voltage range (4.2V ~ 5.5V), and operating temperature specifications (-40°C ~ 85°C). No PCB modifications are required for physical substitution.

Q: What are the key differences between these two devices?

A: The primary differences are program memory type and capacity. The PIC18C658-I/PT uses 32KB OTP (One-Time Programmable) memory, while the PIC18F6585-I/PT uses 48KB FLASH memory. The PIC18F6585-I/PT also includes 1K x 8 EEPROM and larger RAM (3.25K x 8 versus 1.5K x 8). Both share identical core speed (40MHz), I/O count (52), and peripheral features.

Q: When should I choose OTP versus FLASH memory?

A: OTP memory is appropriate for production-ready designs where code is finalized and reprogramming is not required. FLASH memory is suitable for development, prototyping, and applications requiring field updates or in-system reprogramming capability.

Q: Are the connectivity interfaces identical?

A: Yes. Both devices support CANbus, I2C, SPI, and UART/USART interfaces with identical peripheral features including Brown-out Detect/Reset, LVD, POR, PWM, and WDT.

Q: Do both devices meet the same compliance standards?

A: Yes. Both the PIC18C658-I/PT and PIC18F6585-I/PT are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 3, 168 Hours).