PIC16LC77-04I/PQ Equivalent & Substitute Parts

Part Overview

The PIC16LC77-04I/PQ is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 14KB OTP program memory, 368 bytes of RAM, and integrated peripherals including PWM, watchdog timer, and brown-out detection. The device operates at 4MHz with a supply voltage range of 2.5V to 6V and is housed in a 44-MQFP surface mount package.

This part remains in active production status. Substitute parts are identified when equivalent functional capability is required but alternative memory technology, speed ratings, or packaging configurations are acceptable for the application.

Key Parameters

Parameter	Value
Core Processor	PIC
Core Size	8-Bit
Program Memory Size	14KB (8K x 14)
Program Memory Type	OTP
RAM Size	368 x 8
Number of I/O	33
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Data Converters	A/D 8x8b
Voltage - Supply (Vcc/Vdd)	2.5V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	44-QFP
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the PIC16LC77-04I/PQ is based on the following criteria:

Mandatory Equivalence Parameters:

Core processor architecture (PIC)
Core size (8-Bit)
Program memory capacity (14KB / 8K x 14)
RAM capacity (368 x 8)
I/O count (33 pins)
Peripheral set (I2C, SPI, UART/USART, PWM, WDT, brown-out detection)
Data converter specification (A/D 8x8b)
Operating temperature range (-40°C ~ 85°C)
RoHS and MSL compliance

Allowable Variation Parameters:

Program memory technology (OTP to FLASH)
Speed rating (4MHz to higher frequencies)
Supply voltage range (2.5V–6V to 2V–5.5V)
Package variant (44-MQFP to 44-TQFP)
Packaging format (bulk to tray)

The PIC16LF77-I/PT qualifies as a direct substitute based on these criteria.

Parameter Comparison

Parameter	PIC16LC77-04I/PQ	PIC16LF77-I/PT
Manufacturer	Microchip Technology	Microchip Technology
Series	PIC® 16C	PIC® 16F
Core Processor	PIC	PIC
Core Size	8-Bit	8-Bit
Speed	4MHz	20MHz
Program Memory Size	14KB (8K x 14)	14KB (8K x 14)
Program Memory Type	OTP	FLASH
RAM Size	368 x 8	368 x 8
Number of I/O	33	33
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Data Converters	A/D 8x8b	A/D 8x8b
Voltage - Supply (Vcc/Vdd)	2.5V ~ 6V	2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Supplier Device Package	44-MQFP (10x10)	44-TQFP (10x10)
Package / Case	44-QFP	44-TQFP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)
Product Status	Active	Active

Engineering Selection Recommendations

The PIC16LF77-I/PT is a qualified substitute for the PIC16LC77-04I/PQ based on the following engineering factors:

Functional Equivalence: Both devices share identical core architecture, memory capacity, I/O configuration, and peripheral set. The instruction set and pin configuration are compatible.

Memory Technology Advantage: The substitute employs FLASH program memory instead of OTP, enabling field reprogramming and reducing development cycle time. This represents a functional enhancement without compromising application requirements.

Speed Capability: The PIC16LF77-I/PT operates at 20MHz, exceeding the 4MHz specification of the original part. Applications designed for 4MHz operation remain fully compatible at the higher speed rating.

Supply Voltage Consideration: The substitute operates within 2V to 5.5V, which encompasses the lower portion of the original part's 2.5V to 6V range. Applications requiring operation above 5.5V must retain the original PIC16LC77-04I/PQ.

Compliance Status: Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring equivalent handling and storage requirements.

Packaging: Both devices use 44-pin QFP surface mount packages with identical 10x10mm footprints. Pin-to-pin compatibility is maintained.

Frequently Asked Questions (FAQ)

Q: Can the PIC16LF77-I/PT replace the PIC16LC77-04I/PQ in existing designs?

A: Yes, provided the application supply voltage does not exceed 5.5V. The substitute maintains pin-for-pin compatibility, identical memory capacity, and equivalent peripheral functionality. The higher speed rating and FLASH memory technology present no compatibility issues for designs originally specified for 4MHz OTP operation.

Q: What is the primary difference between these two parts?

A: The main differences are program memory technology (OTP versus FLASH), maximum operating speed (4MHz versus 20MHz), and supply voltage range (2.5V–6V versus 2V–5.5V). The PIC16LF77-I/PT offers field reprogrammability through FLASH memory and higher performance capability.

Q: Are the packages physically identical?

A: Both parts use 44-pin QFP surface mount packages with 10x10mm dimensions. The footprint and pin layout are identical, enabling direct PCB substitution without layout modifications.

Q: Does the higher speed of the substitute affect power consumption?

A: Speed capability does not mandate higher operating frequency. Applications can run the PIC16LF77-I/PT at 4MHz or lower, matching the original part's power profile. Higher speed is available only when required by the application.

Q: What are the compliance implications of substitution?

A: Both parts maintain ROHS3 compliance and identical MSL ratings. No additional compliance considerations arise from substitution. Handling and storage requirements remain unchanged.

Q: Can applications designed for 2V operation use the substitute?

A: No. The PIC16LF77-I/PT minimum supply voltage is 2V, matching the original part's lower limit. However, the substitute's maximum is 5.5V, while the original supports up to 6V. Applications requiring operation above 5.5V must use the original PIC16LC77-04I/PQ.

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