PIC16LC77-04I/P Equivalent & Substitute Parts

Part Overview

The PIC16LC77-04I/P is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 14KB OTP (One-Time Programmable) memory, 33 I/O pins, and integrated peripherals including PWM, WDT, and brown-out detection. This device operates at 4MHz with a supply voltage range of 2.5V to 6V and is housed in a 40-PDIP package.

The PIC16LC77-04I/P is classified as obsolete. Locating equivalent or substitute components is necessary for ongoing system maintenance, design updates, or when original inventory becomes unavailable. Direct substitutes must maintain electrical compatibility across core parameters including memory architecture, I/O count, peripheral functionality, and package form factor.

Substiute Parts

PIC16LC77-04I/P

Microchip TechnologyIn Stock: 877PIC16LC77-04I/P Datasheet

Current PartRFQ

PIC16LF77-I/P

Microchip TechnologyIn Stock: 2228PIC16LF77-I/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The PIC16LF77-I/P qualifies as a direct substitute based on the following substitution criteria:

Matching Parameters:

• Core Processor: PIC (identical architecture)
• Core Size: 8-Bit (identical)
• Program Memory Size: 14KB (8K x 14) (identical capacity)
• RAM Size: 368 x 8 (identical)
• Number of I/O: 33 (identical)
• Data Converters: A/D 8x8b (identical)
• Connectivity: I2C, SPI, UART/USART (identical)
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT (identical)
• Mounting Type: Through Hole (identical)
• Package / Case: 40-DIP (0.600", 15.24mm) (identical)
• Operating Temperature: -40°C ~ 85°C (TA) (identical)

Allowable Differences:

• Program Memory Type: OTP (original) vs. FLASH (substitute) — FLASH memory is functionally compatible and offers superior reprogrammability
• Speed: 4MHz (original) vs. 20MHz (substitute) — Higher speed is backward compatible for timing-critical applications
• Voltage - Supply (Vcc/Vdd): 2.5V ~ 6V (original) vs. 2V ~ 5.5V (substitute) — Overlapping range with slightly lower minimum specification
• Product Status: Obsolete (original) vs. Active (substitute) — Active status ensures continued availability and support

Parameter Comparison

Engineering Selection Recommendations

The PIC16LF77-I/P is a qualified substitute for the PIC16LC77-04I/P based on the following engineering criteria:

Compliance & Regulatory Status: Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and legacy system updates.

Product Lifecycle: The PIC16LF77-I/P carries active product status with confirmed inventory availability (2200 pcs), whereas the PIC16LC77-04I/P is obsolete. Selection of the active substitute ensures long-term supply chain stability and manufacturer support.

Memory Architecture Compatibility: The transition from OTP to FLASH memory type provides functional equivalence with enhanced flexibility. FLASH memory maintains the same 14KB capacity and 8K x 14 organization, supporting identical firmware deployment while enabling field reprogrammability.

Electrical Compatibility: The supply voltage range of the substitute (2V ~ 5.5V) overlaps with the original specification (2.5V ~ 6V) across the common operating window. The increased maximum speed (20MHz vs. 4MHz) is backward compatible and does not impose additional requirements on existing designs.

Physical Compatibility: Identical 40-DIP package dimensions and pin count (33 I/O) ensure direct socket compatibility without PCB modifications.

Frequently Asked Questions (FAQ)

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

A: Yes. The PIC16LF77-I/P is a direct substitute. Both devices share identical core architecture, memory capacity, I/O count, peripheral set, and package form factor. The primary differences—FLASH vs. OTP memory and higher maximum speed—are backward compatible enhancements.

Q: What is the difference between OTP and FLASH memory in these devices?

A: OTP (One-Time Programmable) memory can be programmed once during manufacturing and cannot be erased. FLASH memory can be erased and reprogrammed multiple times. The PIC16LF77-I/P FLASH variant offers superior flexibility for development, testing, and field updates while maintaining identical memory capacity and organization.

Q: Does the higher speed rating (20MHz vs. 4MHz) affect compatibility?

A: No. The PIC16LF77-I/P's 20MHz maximum speed is a superset capability. Designs operating at 4MHz will function identically on the substitute device. Higher speed capability does not impose additional power consumption or thermal requirements for existing applications.

Q: Are there voltage supply considerations when substituting?

A: The supply voltage ranges overlap across the common operating window (2.5V ~ 5.5V). If your design operates below 2.5V or above 5.5V, verify that the substitute's range (2V ~ 5.5V) meets your specific requirements. The substitute has a lower minimum specification (2V vs. 2.5V) and a lower maximum specification (5.5V vs. 6V).

Q: Is the 40-DIP package identical between both devices?

A: Yes. Both devices use the 40-DIP package with 0.600" (15.24mm) body dimensions. Pin count and pinout are identical, enabling direct socket compatibility without PCB redesign.

Q: What is the inventory status for each device?

A: The PIC16LC77-04I/P (obsolete) has 808 pcs in stock. The PIC16LF77-I/P (active) has 2200 pcs in stock, providing superior long-term availability and supply chain assurance.