PIC16F639-E/SS Equivalent & Substitute Parts

Part Overview

The PIC16F639-E/SS is an 8-bit microcontroller from Microchip Technology's PIC® 16F series, featuring 4.6KB FLASH program memory and 20MHz operation. This device is classified as obsolete, making identification of compatible alternatives essential for ongoing design support and production continuity. The substitute part maintains identical core functionality while offering improved availability and active product status.

Substiute Parts

PIC16F639-E/SS

Microchip TechnologyIn Stock: 1207PIC16F639-E/SS Datasheet

Current PartRFQ

PIC16F639-I/SS

Microchip TechnologyIn Stock: 4983PIC16F639-I/SS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The PIC16F639-I/SS qualifies as a direct substitute based on the following criteria:

Electrical Compatibility:

• Identical core processor architecture (PIC 8-bit)
• Matching clock speed (20MHz)
• Identical program memory capacity (4.6KB FLASH)
• Identical RAM configuration (128 x 8)
• Identical I/O count (11 pins)
• Identical peripheral set (Brown-out Detect/Reset, LVD, POR, WDT)
• Identical supply voltage range (2V ~ 3.6V)

Mechanical Compatibility:

• Identical package type (20-SSOP)
• Identical package dimensions (0.209", 5.30mm Width)
• Identical mounting type (Surface Mount)

Compliance Alignment:

• Both ROHS3 Compliant
• Both REACH Unaffected
• Identical ECCN and HTSUS classifications

The substitution is based strictly on matching electrical specifications, memory configuration, peripheral functionality, and physical packaging.

Parameter Comparison

Engineering Selection Recommendations

The PIC16F639-I/SS is the appropriate substitute for the obsolete PIC16F639-E/SS. Both devices are ROHS3 compliant and REACH unaffected, ensuring regulatory alignment. The substitute part maintains active product status with verified programmability and higher inventory availability (4923 pcs vs. 1101 pcs).

The operating temperature range differs: the main part supports -40°C ~ 125°C while the substitute supports -40°C ~ 85°C. Applications requiring operation above 85°C must evaluate this limitation against system thermal requirements.

Selection should prioritize the active substitute part for new designs and production continuity, as the main part is obsolete.

Frequently Asked Questions (FAQ)

Q: Can PIC16F639-I/SS directly replace PIC16F639-E/SS in existing designs?

A: Yes. Both parts share identical electrical specifications, memory configuration, peripheral functionality, and 20-SSOP packaging. The substitute is a direct replacement from an electrical and mechanical standpoint.

Q: What is the difference between these two part numbers?

A: The suffix designates temperature grade and product status. The -E suffix indicates the obsolete variant with extended temperature range (-40°C ~ 125°C). The -I suffix indicates the active variant with standard temperature range (-40°C ~ 85°C). Both use identical core architecture and packaging.

Q: Are there packaging differences?

A: No. Both parts use 20-SSOP surface mount packaging with identical dimensions (0.209", 5.30mm Width). PCB layouts and assembly processes remain unchanged.

Q: What about compliance and certifications?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry identical ECCN and HTSUS classifications. Regulatory requirements are satisfied by either part.

Q: Should I consider the operating temperature difference?

A: The substitute part operates to 85°C maximum, compared to 125°C for the main part. Verify that your application's thermal environment remains within the -40°C ~ 85°C range. If sustained operation above 85°C is required, the substitute is not suitable.

Q: Is the substitute part readily available?

A: Yes. The PIC16F639-I/SS has active product status with 4923 pcs in stock, compared to 1101 pcs for the obsolete main part. The substitute offers superior availability for production continuity.