PIC16C621-20E/SS Equivalent & Substitute Parts

Part Overview

The PIC16C621-20E/SS is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 1.75KB OTP program memory, 80 bytes of RAM, and 13 I/O pins. Designed for embedded applications requiring low-cost, compact control solutions, this device operates at 20MHz with a supply voltage range of 3V to 6V and includes integrated brown-out detection, power-on reset, and watchdog timer functionality.

The PIC16C621-20E/SS carries an obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for legacy systems.

Key Parameters

Parameter	Value
Core Processor	PIC
Core Size	8-Bit
Speed	20MHz
Program Memory Size	1.75KB (1K x 14)
Program Memory Type	OTP
RAM Size	80 x 8
Number of I/O	13
Voltage - Supply (Vcc/Vdd)	3V ~ 6V
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
Peripherals	Brown-out Detect/Reset, POR, WDT

Substitute Part Grouping Explanation

Substitution of the PIC16C621-20E/SS is determined by strict alignment of the following critical parameters:

Core Processor Architecture: Must be PIC to ensure instruction set compatibility
Core Size: Must remain 8-Bit
Program Memory: Must be 1.75KB OTP type
RAM Configuration: Must be 80 x 8 bytes
I/O Count: Must provide 13 I/O pins
Operating Voltage: Must support 3V ~ 6V supply range
Package Type: Must be 20-SSOP with identical pin configuration
Speed Rating: Must support 20MHz operation

The primary substitute identified is the PIC16C621-20I/SS, which maintains identical electrical and mechanical specifications while offering active product status and verified programmability through DiGi-Electronics.

Parameter Comparison

Parameter	PIC16C621-20E/SS (Main)	PIC16C621-20I/SS (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Series	PIC® 16C	PIC® 16C
Core Processor	PIC	PIC
Core Size	8-Bit	8-Bit
Speed	20MHz	20MHz
Program Memory Size	1.75KB (1K x 14)	1.75KB (1K x 14)
Program Memory Type	OTP	OTP
RAM Size	80 x 8	80 x 8
Number of I/O	13	13
Voltage - Supply (Vcc/Vdd)	3V ~ 6V	3V ~ 6V
Mounting Type	Surface Mount	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)
Peripherals	Brown-out Detect/Reset, POR, WDT	Brown-out Detect/Reset, POR, WDT
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS	8542.31.0001	8542.31.0001
Product Status	Obsolete	Active
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 85°C (TA)

Engineering Selection Recommendations

The PIC16C621-20I/SS is a direct functional equivalent to the PIC16C621-20E/SS. Both devices share identical core architecture, memory configuration, I/O capability, and package specifications. The substitute maintains full compliance with RoHS3 and REACH requirements.

The primary distinction is product lifecycle status: the main part is obsolete while the substitute is active. The PIC16C621-20I/SS is verified as programmable through DiGi-Electronics, providing assurance for production and field programming operations.

Operating temperature range differs between the two parts. The main part supports -40°C to 125°C, while the substitute supports -40°C to 85°C. Applications requiring operation above 85°C must retain the original part specification or identify alternative solutions outside this product family.

For new designs, production continuity, or legacy system support where operating temperature does not exceed 85°C, the PIC16C621-20I/SS provides equivalent functionality with active supply chain status.

Frequently Asked Questions (FAQ)

Q: Can the PIC16C621-20I/SS replace the PIC16C621-20E/SS in existing designs?

A: Yes, provided the application operating temperature does not exceed 85°C. Both devices are pin-compatible 20-SSOP packages with identical electrical specifications, memory configuration, and I/O architecture. Code compiled for the main part executes without modification on the substitute.

Q: What is the difference between the -20E and -20I designations?

A: The suffix designates the operating temperature range. The -20E variant supports -40°C to 125°C, while the -20I variant supports -40°C to 85°C. Both operate at 20MHz and share all other electrical and functional characteristics.

Q: Are there additional substitute options listed for the PIC16C621-20I/SS?

A: The PIC16C621A-20I/SS is identified as an additional substitute option for the PIC16C621-20I/SS. Detailed parameter comparison for this part should be evaluated separately to confirm compatibility with specific application requirements.

Q: Is the 20-SSOP package pinout identical between the main part and substitute?

A: Yes. Both the PIC16C621-20E/SS and PIC16C621-20I/SS use the 20-SSOP package with 0.209" width and 5.30mm body dimension. Pin assignments and functionality are identical, enabling direct board-level substitution.

Q: What compliance certifications apply to the substitute part?

A: The PIC16C621-20I/SS is ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. These certifications match the main part, ensuring regulatory compatibility for applications subject to environmental and export control requirements.

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