PIC16LC621T-04E/SS Equivalent & Substitute Parts

Part Overview

The PIC16LC621T-04E/SS is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 1.75KB of OTP (One-Time Programmable) memory and 13 I/O pins in a 20-SSOP surface mount package. This device is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The obsolete status necessitates evaluation of active alternatives that maintain electrical and mechanical compatibility with existing applications.

Substiute Parts

PIC16LC621T-04E/SS

Microchip TechnologyIn Stock: 867PIC16LC621T-04E/SS Datasheet

Current PartRFQ

PIC16LC621-04I/SS

Microchip TechnologyIn Stock: 976PIC16LC621-04I/SS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16LC621T-04E/SS is determined by strict equivalence across the following critical parameters:

• Core Architecture: PIC 8-bit processor with identical instruction set compatibility
• Memory Configuration: 1.75KB OTP program memory and 80 x 8 RAM
• I/O Count: 13 I/O pins
• Operating Voltage: 2.5V to 6V supply range
• Clock Speed: 4MHz operation
• Package Format: 20-SSOP surface mount with 0.209" width (5.30mm)
• Peripheral Set: Brown-out Detect/Reset, Power-On Reset (POR), and Watchdog Timer (WDT)

The PIC16LC621-04I/SS qualifies as a direct substitute based on identical electrical specifications and mechanical compatibility. The primary distinction is product status: the substitute part is active, whereas the original is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The PIC16LC621-04I/SS is a direct electrical and mechanical equivalent to the PIC16LC621T-04E/SS. Both devices share identical core specifications, memory architecture, I/O configuration, and package format. The substitute part carries active product status from Microchip Technology, ensuring ongoing availability and support compared to the obsolete original.

One operational consideration exists: the substitute part specifies an operating temperature range of -40°C to 85°C, whereas the original supports -40°C to 125°C. Applications requiring operation above 85°C must retain the original part or identify alternative solutions outside this product family.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), supporting standard manufacturing and storage practices. Procurement of the PIC16LC621-04I/SS is recommended for new designs and ongoing system support where temperature requirements do not exceed 85°C.

Frequently Asked Questions (FAQ)

Q: Are the PIC16LC621T-04E/SS and PIC16LC621-04I/SS pin-compatible?

A: Yes. Both devices use the 20-SSOP package with identical pin assignments, I/O count (13 pins), and electrical characteristics. Direct PCB substitution is supported without layout modifications.

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

A: The primary differences are product status and maximum operating temperature. The PIC16LC621T-04E/SS is obsolete with a 125°C maximum rating, while the PIC16LC621-04I/SS is active with an 85°C maximum rating. All other electrical and mechanical specifications are identical.

Q: Can I use the PIC16LC621-04I/SS in applications requiring 125°C operation?

A: No. The substitute part is rated only to 85°C. Applications requiring higher temperature operation must use the original part or evaluate alternative microcontroller families from Microchip Technology.

Q: Are both parts RoHS compliant?

A: Yes. Both the PIC16LC621T-04E/SS and PIC16LC621-04I/SS are ROHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity ratings.

Q: What is the inventory status of these parts?

A: The original PIC16LC621T-04E/SS has 767 pieces in stock as new original inventory. The substitute PIC16LC621-04I/SS has 905 pieces in stock as new original inventory.