PIC16C620AT-04I/SO Equivalent & Substitute Parts

Part Overview

The PIC16C620AT-04I/SO is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, designed for embedded applications requiring OTP (One-Time Programmable) memory. This device features 896B of program memory, 96 x 8 bytes of RAM, and operates at 4MHz with a supply voltage range of 2.5V to 5.5V. The part is currently active in production and ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters allow direct functional replacement in 18-SOIC surface mount applications.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Core Processor	PIC
Core Size	8-Bit
Speed	4MHz
Program Memory Size	896B (512 x 14)
Program Memory Type	OTP
RAM Size	96 x 8
Voltage - Supply (Vcc/Vdd)	2.5V ~ 5.5V
Number of I/O	13
Mounting Type	Surface Mount
Package / Case	18-SOIC (0.295", 7.50mm Width)
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the PIC16C620AT-04I/SO are identified based on the following critical parameters:

Direct Substitutes (Identical Electrical & Mechanical Specifications):

Core processor family: PIC
Package type: 18-SOIC
Operating temperature range: -40°C ~ 85°C
Supply voltage compatibility: 2.5V ~ 5.5V minimum overlap
Mounting type: Surface Mount
RoHS compliance: ROHS3 Compliant

Manufacturer-Recommended Alternatives (Enhanced Capabilities):

Same package footprint (18-SOIC)
Same core processor family (PIC)
Compatible operating temperature range
Enhanced memory or speed specifications
Backward-compatible pin configuration

Parameter Comparison

Parameter	PIC16C620AT-04I/SO	PIC16C620A-04I/SO	PIC16F627A-I/SO
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Series	PIC® 16C	PIC® 16C	PIC® 16F
Core Size	8-Bit	8-Bit	8-Bit
Speed	4MHz	4MHz	20MHz
Program Memory Size	896B (512 x 14)	896B (512 x 14)	1.75KB (1K x 14)
Program Memory Type	OTP	OTP	FLASH
RAM Size	96 x 8	96 x 8	224 x 8
EEPROM Size	—	—	128 x 8
Number of I/O	13	13	16
Voltage - Supply (Vcc/Vdd)	2.5V ~ 5.5V	2.5V ~ 5.5V	3V ~ 5.5V
Oscillator Type	External	External	Internal
Peripherals	Brown-out Detect/Reset, POR, WDT	Brown-out Detect/Reset, POR, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Connectivity	—	—	UART/USART
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	18-SOIC (0.295", 7.50mm Width)	18-SOIC (0.295", 7.50mm Width)	18-SOIC (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

PIC16C620A-04I/SO (Direct Substitute)

This part is a direct electrical and mechanical equivalent to the PIC16C620AT-04I/SO. Both devices share identical core specifications: 8-bit PIC processor, 4MHz operation, 896B OTP program memory, 96 x 8 RAM, 13 I/O pins, and 18-SOIC packaging. Both maintain ROHS3 compliance and active product status. Selection between these two parts depends on packaging format availability (tube vs. standard packaging) and inventory requirements.

PIC16F627A-I/SO (Manufacturer-Recommended Alternative)

The PIC16F627A-I/SO is recommended by Microchip Technology as an enhanced alternative. This part maintains the same 18-SOIC package footprint and operating temperature range, ensuring mechanical compatibility. Key enhancements include FLASH memory (reprogrammable) versus OTP, increased program memory (1.75KB), expanded RAM (224 x 8), integrated EEPROM (128 x 8), higher clock speed (20MHz), additional I/O pins (16), internal oscillator capability, PWM peripheral, and UART/USART connectivity. The minimum supply voltage increases to 3V. This part is suitable for applications requiring reprogrammability, higher performance, or additional peripheral functionality while maintaining the same physical footprint.

Frequently Asked Questions (FAQ)

Q: Can PIC16C620A-04I/SO directly replace PIC16C620AT-04I/SO?

A: Yes. Both parts are electrically and mechanically identical, sharing the same core processor, memory configuration, I/O count, speed, voltage range, and 18-SOIC package. Substitution is direct with no design modifications required.

Q: What are the key differences between PIC16C620AT-04I/SO and PIC16F627A-I/SO?

A: The primary differences are program memory type (OTP vs. FLASH), memory capacity (896B vs. 1.75KB program memory), clock speed (4MHz vs. 20MHz), I/O count (13 vs. 16), RAM size (96 x 8 vs. 224 x 8), and additional peripherals (PWM, UART/USART, EEPROM in the PIC16F627A). The minimum supply voltage for PIC16F627A-I/SO is 3V instead of 2.5V.

Q: Is PIC16F627A-I/SO a drop-in replacement for PIC16C620AT-04I/SO?

A: Mechanically, yes—both use 18-SOIC packaging with compatible pin configurations. Electrically, the PIC16F627A-I/SO offers enhanced capabilities but requires verification that the 3V minimum supply voltage meets system requirements (versus 2.5V for the original part). Firmware may require updates to utilize FLASH memory reprogrammability and additional peripherals.

Q: Why would I choose PIC16F627A-I/SO over the direct substitute?

A: Selection of PIC16F627A-I/SO is appropriate when applications require FLASH memory for field reprogramming, higher processing speed (20MHz), additional I/O pins (16 vs. 13), integrated EEPROM, PWM functionality, or UART/USART communication. The same 18-SOIC footprint eliminates PCB redesign.

Q: Are all three parts ROHS3 compliant?

A: Yes. PIC16C620AT-04I/SO, PIC16C620A-04I/SO, and PIC16F627A-I/SO are all ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: What is the packaging difference between PIC16C620AT-04I/SO and PIC16C620A-04I/SO?

A: The primary documented difference is packaging format. PIC16C620A-04I/SO is supplied in tube packaging, while PIC16C620AT-04I/SO packaging format is not specified in the provided data. Both maintain identical electrical specifications and 18-SOIC case dimensions.

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