PIC16LC770-I/SO Equivalent & Substitute Parts

Part Overview

The PIC16LC770-I/SO is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 4.6KB OTP program memory, 256 x 8 bytes of RAM, and integrated peripherals including PWM, watchdog timer, and brown-out detection. The device operates at 20MHz with a supply voltage range of 2.5V to 5.5V and is housed in a 20-SOIC surface mount package. Currently in active production status with 2300 units in stock, this component serves applications requiring low-cost, low-power microcontroller functionality with OTP memory for one-time programmable applications.

Substitute parts become necessary when OTP memory limitations require reprogrammable FLASH alternatives, when package density improvements are needed, or when supply chain constraints affect availability of the original part number.

Substiute Parts

PIC16LC770-I/SO

Microchip TechnologyIn Stock: 2347PIC16LC770-I/SO Datasheet

Current PartRFQ

PIC16F819-I/SO

Microchip TechnologyIn Stock: 7053PIC16F819-I/SO Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16LC770-I/SO is based on the following critical parameters that must remain compatible:

• Core Processor Architecture: Must be PIC to maintain instruction set compatibility
• Core Size: Must remain 8-Bit for software and hardware interface compatibility
• Operating Speed: Must support 20MHz operation
• Program Memory Size: Must provide minimum 4.6KB (2K x 14) capacity
• RAM Size: Must provide minimum 256 x 8 bytes
• Supply Voltage Range: Must encompass or be compatible with 2.5V ~ 5.5V operation
• Connectivity Protocols: Must support I2C and SPI interfaces
• Peripheral Set: Must include Brown-out Detect/Reset, POR, PWM, and WDT functions
• Package Compatibility: Physical dimensions and pin count must allow direct substitution or board-level accommodation

The PIC16F819-I/SO qualifies as a manufacturer-recommended substitute by meeting these core requirements while offering FLASH reprogrammable memory instead of OTP, providing enhanced development flexibility and field updateability.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration: The PIC16F819-I/SO is the manufacturer-recommended substitute and is verified as programmable through DiGi-Electronics channels, whereas the original PIC16LC770-I/SO is not verified for programmability.

Supply Voltage Compatibility: Applications operating below 4V must retain the PIC16LC770-I/SO, as the substitute's minimum supply voltage is 4V. The original part supports operation down to 2.5V.

Analog-to-Digital Converter Requirements: The original part provides 6 channels of 12-bit ADC, while the substitute provides 5 channels of 10-bit ADC. Applications requiring 12-bit resolution or 6 ADC channels must use the original part.

Package and Pin Count: The original part uses a 20-pin SOIC package, while the substitute uses an 18-pin SOIC package. Direct socket substitution is not possible; board-level redesign is required for the PIC16F819-I/SO.

Memory Reprogrammability: The substitute's FLASH memory enables field reprogramming and development iteration, whereas the original OTP memory is one-time programmable. For production-locked applications, the original part is appropriate; for development and field-updateable designs, the substitute is preferred.

Compliance and Availability: Both parts maintain ROHS3 compliance and REACH unaffected status. The substitute has higher inventory availability (7000 units vs. 2300 units) and is packaged in tubes for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can the PIC16F819-I/SO be used as a direct replacement for the PIC16LC770-I/SO?

A: Direct socket replacement is not possible due to different package pin counts (18-SOIC vs. 20-SOIC). However, the PIC16F819-I/SO can be used as a functional substitute if the application circuit is redesigned to accommodate the 18-pin package and the two unused pins from the original design are removed or left unconnected.

Q: What are the key differences in memory between these parts?

A: The PIC16LC770-I/SO uses OTP (One-Time Programmable) memory, which cannot be erased or reprogrammed after initial programming. The PIC16F819-I/SO uses FLASH memory, which can be reprogrammed multiple times. Additionally, the PIC16F819-I/SO includes 256 x 8 bytes of EEPROM, which the original part does not have.

Q: Are there supply voltage limitations when substituting?

A: Yes. The original part operates from 2.5V to 5.5V, while the substitute operates from 4V to 5.5V. If your application requires operation below 4V, the PIC16LC770-I/SO must be used.

Q: How do the analog-to-digital converters differ?

A: The PIC16LC770-I/SO provides 6 channels of 12-bit ADC. The PIC16F819-I/SO provides 5 channels of 10-bit ADC. Applications requiring 12-bit resolution or more than 5 ADC channels must use the original part.

Q: What is the significance of the additional I/O pin on the substitute?

A: The PIC16F819-I/SO provides 16 I/O pins compared to 15 on the original part. This additional pin may be useful for expanded functionality but does not affect substitution compatibility if the extra pin is not required by the application.

Q: Are both parts suitable for production use?

A: Yes. Both parts are in active production status and ROHS3 compliant. The original part is appropriate for one-time programmable production designs. The substitute is suitable for designs requiring field reprogrammability or development flexibility.

Q: What packaging options are available?

A: The PIC16LC770-I/SO is supplied in standard packaging (not specified in available data). The PIC16F819-I/SO is supplied in tubes, which is suitable for automated assembly processes.