PIC16C662-10/L Equivalent & Substitute Parts

Part Overview

The PIC16C662-10/L is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 7KB OTP (One-Time Programmable) memory and operating at 10MHz. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The 44-PLCC package provides 33 I/O pins with integrated peripherals including brown-out detection, reset functionality, and watchdog timer capabilities.

Substiute Parts

PIC16C662-10/L

Microchip TechnologyIn Stock: 1015PIC16C662-10/L Datasheet

Current PartRFQ

PIC16F74-I/L

Microchip TechnologyIn Stock: 1994PIC16F74-I/L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16C662-10/L is based on the following critical parameters:

Core Compatibility Requirements:

• Identical core processor architecture (PIC)
• Matching core size (8-Bit)
• Identical program memory size (7KB / 4K x 14)
• Identical number of I/O pins (33)
• Compatible package type (44-LCC J-Lead)

Functional Compatibility:

• Overlapping voltage supply range (minimum 4V requirement met)
• Compatible peripheral set (brown-out detect/reset, watchdog timer)
• Surface mount mounting type

The PIC16F74-I/L qualifies as a direct substitute because it maintains all core architectural parameters while offering enhanced specifications in memory type (FLASH vs. OTP), processing speed (20MHz vs. 10MHz), and operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C). The FLASH memory type provides reprogrammability advantages over OTP, and the active product status ensures long-term availability.

Parameter Comparison

Engineering Selection Recommendations

The PIC16F74-I/L is the manufacturer-recommended substitute for the obsolete PIC16C662-10/L. Selection should be based on the following engineering criteria:

Product Status Consideration: The PIC16C662-10/L is obsolete, while the PIC16F74-I/L maintains active product status with confirmed availability. This ensures supply chain continuity and long-term support.

Compliance Alignment: Both parts maintain ROHS3 compliance and identical ECCN/HTSUS classifications, ensuring regulatory consistency in design transitions.

Memory Technology Advantage: The transition from OTP to FLASH memory in the PIC16F74-I/L provides reprogrammability without requiring device replacement, reducing development cycle time and supporting firmware updates in field applications.

Thermal and Speed Headroom: The PIC16F74-I/L operates at double the clock speed (20MHz vs. 10MHz) and supports an extended operating temperature range (-40°C ~ 85°C), providing design margin for demanding applications.

Voltage Supply Consideration: The PIC16F74-I/L maximum supply voltage is 5.5V compared to 6V for the original part. Applications requiring operation above 5.5V require voltage regulation or alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the PIC16F74-I/L directly replace the PIC16C662-10/L in existing designs?

A: Yes, for applications operating within the PIC16F74-I/L voltage range (4V ~ 5.5V) and temperature range (-40°C ~ 85°C). The identical I/O count (33), package type (44-LCC), and program memory size (7KB) ensure pin-for-pin and functional compatibility. Firmware compatibility depends on instruction set alignment within the PIC 16-series architecture.

Q: What is the primary advantage of FLASH memory over OTP?

A: FLASH memory allows in-circuit reprogramming without device replacement, whereas OTP (One-Time Programmable) memory cannot be erased or rewritten. This reduces development costs and enables field firmware updates.

Q: Are there voltage supply limitations when substituting?

A: Yes. The PIC16C662-10/L supports 4V ~ 6V operation, while the PIC16F74-I/L supports 4V ~ 5.5V. Applications requiring operation above 5.5V cannot use the PIC16F74-I/L without external voltage regulation.

Q: Does the increased clock speed (20MHz vs. 10MHz) affect firmware compatibility?

A: The PIC16F74-I/L's higher clock speed is backward compatible with PIC16C662-10/L firmware. Timing-dependent code may execute faster, potentially requiring adjustment of delay loops or timer configurations to maintain equivalent timing behavior.

Q: What is the package compatibility between these parts?

A: Both parts use the 44-LCC (J-Lead) package with identical footprint dimensions (16.59x16.59mm). PCB layout and socket compatibility are maintained without modification.

Q: Is the increased RAM size (192 x 8 vs. 176 x 8) significant?

A: The 16-byte increase in RAM provides additional variable storage space. Existing firmware designed for the PIC16C662-10/L will operate without modification, with the additional RAM available for enhanced functionality.