PIC16LC621AT-04E/SS Equivalent & Substitute Parts

Part Overview

The PIC16LC621AT-04E/SS is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 1.75KB of OTP program memory and 96 bytes of RAM 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. The part operates across a wide supply voltage range of 2.5V to 5.5V and includes integrated peripherals such as brown-out detection/reset, power-on reset, and watchdog timer functionality.

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
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the PIC16LC621AT-04E/SS is determined by strict equivalence across the following critical parameters:

Core processor architecture (PIC)
Core size (8-Bit)
Operating speed (4MHz)
Program memory capacity and type (1.75KB OTP)
RAM capacity (96 x 8)
I/O pin count (13)
Supply voltage range (2.5V ~ 5.5V)
Package type and dimensions (20-SSOP)
RoHS and compliance certifications

Substitute parts must maintain identical electrical and mechanical specifications to ensure direct replacement capability without circuit redesign or firmware modification.

Parameter Comparison

Parameter	PIC16LC621AT-04E/SS (Main)	PIC16LC621A-04E/SS	PIC16LC621A-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
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 85°C (TA)
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)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

PIC16LC621A-04E/SS is the primary substitute for PIC16LC621AT-04E/SS. Both parts share identical electrical specifications and package configuration. The PIC16LC621A-04E/SS carries active product status from Microchip Technology, ensuring ongoing availability and supply chain support. This part is ROHS3 compliant and maintains the same moisture sensitivity level classification.

PIC16LC621A-04I/SS is a secondary substitute option. This part maintains electrical equivalence across all critical parameters with one exception: the operating temperature range is limited to -40°C to 85°C, compared to the -40°C to 125°C range of the main part. Selection of this variant requires confirmation that the application does not require operation above 85°C. The part is also active and ROHS3 compliant.

Both substitute parts are suitable for direct replacement in applications where the PIC16LC621AT-04E/SS was originally specified, provided that temperature operating range requirements are satisfied.

Frequently Asked Questions (FAQ)

Q: Can PIC16LC621A-04E/SS be used as a direct replacement for PIC16LC621AT-04E/SS?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including core processor, memory configuration, I/O count, supply voltage range, operating temperature range, and 20-SSOP package dimensions. No circuit modifications are required.

Q: What is the difference between PIC16LC621A-04E/SS and PIC16LC621A-04I/SS?

A: The primary difference is the operating temperature range. PIC16LC621A-04E/SS operates from -40°C to 125°C, while PIC16LC621A-04I/SS operates from -40°C to 85°C. All other electrical and mechanical specifications are identical. Selection depends on application temperature requirements.

Q: Why is the main part PIC16LC621AT-04E/SS classified as obsolete?

A: Obsolete status indicates that Microchip Technology has discontinued active production and support for this specific part number. The substitute parts PIC16LC621A-04E/SS and PIC16LC621A-04I/SS are active alternatives that provide equivalent functionality.

Q: Are the substitute parts ROHS3 compliant?

A: Yes. Both PIC16LC621A-04E/SS and PIC16LC621A-04I/SS are ROHS3 compliant, matching the compliance status of the main part.

Q: What is the moisture sensitivity level for these parts?

A: All three parts carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions for storage or handling.

Q: Can firmware developed for PIC16LC621AT-04E/SS run on the substitute parts without modification?

A: Yes. The substitute parts maintain identical core processor architecture, memory configuration, and I/O specifications. Firmware compatibility is assured without code changes.

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