PIC16LC774-I/PT Equivalent & Substitute Parts

Part Overview

The PIC16LC774-I/PT is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, currently in active production status. This device features 7KB OTP program memory, 256 x 8 bytes of RAM, and operates at speeds up to 20MHz with a supply voltage range of 2.5V to 5.5V. The 44-TQFP surface mount package provides 33 I/O pins and integrates essential peripherals including PWM, watchdog timer, and brown-out detection. Finding equivalent or substitute parts may be necessary due to inventory constraints, design upgrades, or application-specific performance requirements.

Key Parameters

Parameter	Value
Core Processor	PIC
Core Size	8-Bit
Package / Case	44-TQFP (10x10)
Mounting Type	Surface Mount
Program Memory Type	OTP
Connectivity	I2C, SPI, UART/USART
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

The PIC18F4423-I/PT qualifies as a substitute for the PIC16LC774-I/PT based on the following alignment of critical parameters:

Matching Parameters:

Core Processor: Both utilize PIC architecture
Core Size: Both are 8-bit devices
Package / Case: Both use 44-TQFP (10x10) surface mount configuration
Mounting Type: Both are surface mount
Connectivity: Both support I2C, SPI, and UART/USART interfaces
Operating Temperature: Both operate across -40°C to 85°C
RoHS Status: Both are ROHS3 compliant
Product Status: Both are active production devices

The PIC18F4423-I/PT represents an enhanced variant within the PIC microcontroller family, maintaining full package and pin compatibility while offering expanded memory and performance capabilities.

Parameter Comparison

Parameter	PIC16LC774-I/PT	PIC18F4423-I/PT
Series	PIC® 16C	PIC® 18F
Speed	20MHz	40MHz
Program Memory Size	7KB (4K x 14)	16KB (8K x 16)
Program Memory Type	OTP	FLASH
RAM Size	256 x 8	768 x 8
EEPROM Size	-	256 x 8
Voltage - Supply (Vcc/Vdd)	2.5V ~ 5.5V	4.2V ~ 5.5V
Number of I/O	33	36
Data Converters	A/D 10x12b	A/D 13x12b
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Oscillator Type	External	Internal
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

Both the PIC16LC774-I/PT and PIC18F4423-I/PT maintain ROHS3 compliance and active product status, ensuring regulatory alignment and long-term availability. The PIC18F4423-I/PT offers enhanced specifications including doubled program memory capacity (16KB FLASH versus 7KB OTP), tripled RAM allocation (768 x 8 versus 256 x 8), and doubled processing speed (40MHz versus 20MHz). The substitute device features FLASH memory technology enabling field reprogramming, whereas the original employs OTP technology. The PIC18F4423-I/PT includes integrated EEPROM and high-level voltage detect (HLVD) functionality not present in the original device. Supply voltage range differs slightly, with the substitute requiring minimum 4.2V versus 2.5V for the original. Both devices maintain identical 44-TQFP packaging and pin count compatibility for direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Are the PIC16LC774-I/PT and PIC18F4423-I/PT pin-compatible?

A: Yes. Both devices use the 44-TQFP (10x10) package with identical pin counts and compatible I/O configurations, enabling direct substitution on PCB layouts designed for either device.

Q: What are the key differences in memory architecture?

A: The PIC16LC774-I/PT provides 7KB OTP program memory, while the PIC18F4423-I/PT offers 16KB FLASH program memory. OTP memory is programmed once during manufacturing, whereas FLASH memory supports field reprogramming. RAM capacity differs significantly: 256 x 8 bytes versus 768 x 8 bytes respectively.

Q: Does the substitute part require firmware modifications?

A: Firmware compatibility depends on application-specific code. Both devices support identical communication protocols (I2C, SPI, UART/USART) and share the PIC instruction set architecture. However, differences in memory size, peripheral configuration, and oscillator type may necessitate code adjustments.

Q: What is the impact of the supply voltage range difference?

A: The PIC16LC774-I/PT operates from 2.5V to 5.5V, while the PIC18F4423-I/PT requires 4.2V to 5.5V. Applications requiring operation below 4.2V cannot use the substitute device without additional voltage regulation or alternative component selection.

Q: How do the oscillator configurations differ?

A: The PIC16LC774-I/PT requires an external oscillator, whereas the PIC18F4423-I/PT includes an internal oscillator option. This affects PCB layout and component count for clock generation circuits.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference?

A: The PIC16LC774-I/PT has MSL 3 (168-hour shelf life limit), while the PIC18F4423-I/PT has MSL 1 (unlimited shelf life). Lower MSL ratings provide greater flexibility in storage and handling without baking requirements.

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