PIC16C621AT-04E/SS Equivalent & Substitute Parts

Part Overview

The PIC16C621AT-04E/SS is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 1.75KB OTP program memory and 13 I/O pins in a 20-SSOP surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across core processor architecture, memory configuration, I/O count, and operating parameters to ensure functional equivalence in existing applications.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Core Processor	PIC
Core Size	8-Bit
Speed	4MHz
Program Memory Size	1.75KB (1K x 14)
Program Memory Type	OTP
RAM Size	96 x 8
Number of I/O	13
Voltage Supply (Vcc/Vdd)	2.5V ~ 5.5V
Peripherals	Brown-out Detect/Reset, POR, WDT
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
Operating Temperature	-40°C ~ 125°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the PIC16C621AT-04E/SS is determined by strict equivalence across the following critical parameters:

Core processor architecture (PIC 8-bit)
Program memory capacity (1.75KB OTP)
RAM configuration (96 x 8)
I/O pin count (13)
Operating voltage range (2.5V ~ 5.5V)
Package type and dimensions (20-SSOP)
Peripheral feature set (Brown-out Detect/Reset, POR, WDT)

Substitute parts must maintain identical electrical and functional characteristics within these parameters. Variations in product status, packaging format (Tape & Reel vs. Tube), or temperature rating do not disqualify substitution when core electrical specifications remain unchanged.

Parameter Comparison

Parameter	PIC16C621AT-04E/SS (Main)	PIC16C621A-04E/SS	PIC16C621A-04I/SS
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active
Core Processor	PIC	PIC	PIC
Core Size	8-Bit	8-Bit	8-Bit
Speed	4MHz	4MHz	4MHz
Program Memory Size	1.75KB (1K x 14)	1.75KB (1K x 14)	1.75KB (1K x 14)
Program Memory Type	OTP	OTP	OTP
RAM Size	96 x 8	96 x 8	96 x 8
Number of I/O	13	13	13
Voltage Supply (Vcc/Vdd)	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Peripherals	Brown-out Detect/Reset, POR, WDT	Brown-out Detect/Reset, POR, WDT	Brown-out Detect/Reset, POR, WDT
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Format	Tape & Reel (TR)	Not specified	Tube

Engineering Selection Recommendations

Both PIC16C621A-04E/SS and PIC16C621A-04I/SS are electrically equivalent substitutes for the obsolete PIC16C621AT-04E/SS across all core functional parameters. Selection between substitute options should be based on the following criteria:

PIC16C621A-04E/SS is an active product with identical electrical specifications and operating temperature range (-40°C ~ 125°C), providing direct functional replacement with current manufacturing support and availability.

PIC16C621A-04I/SS is an active product with identical electrical specifications but operates within a reduced temperature range (-40°C ~ 85°C). This part is suitable for applications where the extended upper temperature limit of 125°C is not required. Higher inventory availability (3386 Pcs) may support production requirements.

Both substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical peripheral feature sets. Packaging format differences (Tape & Reel vs. Tube) do not affect electrical compatibility and should be selected based on assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can PIC16C621A-04E/SS and PIC16C621A-04I/SS be used interchangeably with PIC16C621AT-04E/SS?

A: Both parts are electrically equivalent substitutes. PIC16C621A-04E/SS maintains identical operating temperature range. PIC16C621A-04I/SS operates within -40°C ~ 85°C and is suitable for applications not requiring the extended 125°C upper limit.

Q: What is the difference between the two substitute parts?

A: The primary difference is operating temperature range. PIC16C621A-04E/SS supports -40°C ~ 125°C, while PIC16C621A-04I/SS supports -40°C ~ 85°C. Packaging format also differs: PIC16C621A-04E/SS uses unspecified packaging, while PIC16C621A-04I/SS uses Tube packaging.

Q: Are there any compliance or certification differences?

A: All three parts maintain identical RoHS3 compliance, MSL 1 rating, and regulatory status (REACH Unaffected, ECCN EAR99, HTSUS 8542.31.0001).

Q: Does the packaging format affect electrical performance?

A: No. Packaging format (Tape & Reel vs. Tube) is a logistics and assembly consideration only. Electrical and functional specifications remain identical regardless of packaging format.

Q: Which substitute should be selected for high-temperature applications?

A: PIC16C621A-04E/SS is required for applications operating above 85°C, as it maintains the full -40°C ~ 125°C temperature range of the original part.

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