PIC16LC77-04I/PT Equivalent & Substitute Parts

Part Overview

The PIC16LC77-04I/PT is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 14KB OTP program memory, 368 x 8 bytes of RAM, and 33 I/O pins in a 44-TQFP surface mount package. The device operates at 4MHz with a supply voltage range of 2.5V to 6V and includes integrated peripherals such as PWM, watchdog timer, brown-out detection, and an 8-channel 8-bit analog-to-digital converter. With active product status and ROHS3 compliance, this microcontroller serves applications requiring low-power operation and OTP memory configuration. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same package footprint and pin configuration.

Substiute Parts

PIC16LC77-04I/PT

Microchip TechnologyIn Stock: 887PIC16LC77-04I/PT Datasheet

Current PartRFQ

PIC16LF77-I/PT

Microchip TechnologyIn Stock: 2914PIC16LF77-I/PT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16LC77-04I/PT is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Core processor architecture (PIC)
• Core size (8-Bit)
• Program memory size (14KB / 8K x 14)
• RAM capacity (368 x 8)
• I/O pin count (33)
• Package type and footprint (44-TQFP 10x10)
• Mounting configuration (Surface Mount)
• Operating temperature range (-40°C ~ 85°C)
• Supply voltage compatibility

Allowable Variations:

• Program memory type (OTP to FLASH)
• Operating speed (4MHz to higher frequencies)
• Supply voltage range (2.5V ~ 6V to 2V ~ 5.5V)
• Product series designation (PIC® 16C to PIC® 16F)

The PIC16LF77-I/PT qualifies as a direct substitute based on identical core architecture, memory organization, I/O configuration, and package specifications, with the primary difference being FLASH-based program memory instead of OTP, and enhanced speed capability.

Parameter Comparison

Engineering Selection Recommendations

The PIC16LF77-I/PT serves as a direct substitute for the PIC16LC77-04I/PT in applications where the following conditions are met:

Compatibility Criteria:

• Identical pinout and 44-TQFP package footprint ensure mechanical interchangeability without PCB redesign
• Matching core architecture, memory organization, and I/O configuration maintain functional equivalence
• Both devices maintain ROHS3 compliance and identical MSL ratings
• Active product status for both parts ensures continued availability and supply chain stability

Functional Differences:

• FLASH-based program memory in the substitute allows field reprogramming, whereas OTP memory in the original is one-time programmable
• Enhanced speed capability (20MHz vs. 4MHz) provides performance headroom without functional degradation
• Supply voltage range of the substitute (2V ~ 5.5V) is narrower than the original (2.5V ~ 6V); applications requiring operation below 2V or above 5.5V must retain the original part

Selection Logic: Choose the PIC16LF77-I/PT when FLASH reprogrammability is beneficial or when higher operating speed is required. Retain the PIC16LC77-04I/PT for applications with fixed firmware requiring OTP memory or when supply voltage operation below 2V is mandatory.

Frequently Asked Questions (FAQ)

Q: Can the PIC16LF77-I/PT be used as a direct replacement for the PIC16LC77-04I/PT?

A: Yes, the PIC16LF77-I/PT is mechanically and electrically compatible as a substitute. Both devices share identical pinout, package footprint (44-TQFP), core architecture, memory size, and I/O configuration. No PCB modifications are required for physical substitution.

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

A: The main difference is program memory type: the PIC16LC77-04I/PT uses OTP (one-time programmable) memory, while the PIC16LF77-I/PT uses FLASH memory, allowing field reprogramming. Additionally, the substitute operates at 20MHz compared to 4MHz for the original.

Q: Are there supply voltage compatibility concerns?

A: The original part operates from 2.5V to 6V, while the substitute operates from 2V to 5.5V. Applications requiring operation above 5.5V or below 2V must use the original PIC16LC77-04I/PT. For standard 3.3V or 5V supply applications, both parts are compatible.

Q: Does the higher speed of the substitute affect compatibility?

A: No. The 20MHz capability of the PIC16LF77-I/PT is backward compatible with applications designed for 4MHz operation. The substitute will function correctly at lower clock speeds without modification.

Q: Are both parts available in the same packaging options?

A: Yes. Both the PIC16LC77-04I/PT and PIC16LF77-I/PT are supplied in 44-TQFP (10x10) surface mount packages with identical MSL ratings of 3 (168 Hours) and ROHS3 compliance.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. Choose the PIC16LF77-I/PT for new designs requiring firmware flexibility or higher performance. The PIC16LC77-04I/PT is appropriate only when OTP memory and extended supply voltage range (up to 6V) are specific design requirements.