PIC16LC781T-I/SO Equivalent & Substitute Parts

Part Overview

The PIC16LC781T-I/SO is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 1.75KB of OTP program memory, 128 bytes of RAM, and integrated peripherals including brown-out detection, power-on reset, PWM, and watchdog timer functionality. With 13 I/O pins and dual data converters (8-channel 8-bit A/D and 1-channel 8-bit D/A), this device operates at 20MHz across a 2.7V to 5.5V supply range in a 20-SOIC surface mount package.

The PIC16LC781T-I/SO is classified as obsolete. Locating equivalent or substitute components is necessary for ongoing system support, maintenance, and new production runs where original stock availability is limited or depleted.

Key Parameters

Parameter	Value
Core Processor	PIC
Core Size	8-Bit
Speed	20MHz
Program Memory Size	1.75KB (1K x 14)
Program Memory Type	OTP
RAM Size	128 x 8
Number of I/O	13
Data Converters	A/D 8x8b; D/A 1x8b
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT

Substitute Part Grouping Explanation

Substitution for the PIC16LC781T-I/SO is determined by strict equivalence across the following critical parameters:

Core Processor Architecture: PIC processor family
Core Size: 8-Bit instruction set
Program Memory: 1.75KB OTP capacity
RAM: 128 x 8 byte configuration
I/O Count: 13 pins minimum
Data Converters: 8-channel 8-bit A/D and 1-channel 8-bit D/A
Operating Voltage: 2.7V to 5.5V range
Speed: 20MHz operation
Package: 20-SOIC form factor
Peripherals: Brown-out detection, POR, PWM, and WDT functionality

The PIC16LC781-I/SO meets all substitution criteria as a direct equivalent, sharing identical electrical specifications, memory configuration, I/O architecture, and peripheral feature set. The primary distinction is product status and packaging format.

Parameter Comparison

Parameter	PIC16LC781T-I/SO (Main)	PIC16LC781-I/SO (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Series	PIC® 16C	PIC® 16C
Core Processor	PIC	PIC
Core Size	8-Bit	8-Bit
Speed	20MHz	20MHz
Program Memory Size	1.75KB (1K x 14)	1.75KB (1K x 14)
Program Memory Type	OTP	OTP
RAM Size	128 x 8	128 x 8
Number of I/O	13	13
Data Converters	A/D 8x8b; D/A 1x8b	A/D 8x8b; D/A 1x8b
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Product Status	Obsolete	Active
Packaging Format	Not specified	Tube
RoHS Status	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

The PIC16LC781-I/SO is a direct functional equivalent to the PIC16LC781T-I/SO. Both devices share identical electrical characteristics, memory architecture, I/O configuration, and peripheral feature set. Selection between these parts should be based on the following factors:

Product Status: The PIC16LC781-I/SO carries an active product status, ensuring ongoing availability and manufacturer support. The PIC16LC781T-I/SO is obsolete, limiting future procurement options.

Compliance Considerations: The PIC16LC781T-I/SO is ROHS3 compliant. The PIC16LC781-I/SO is RoHS non-compliant. Applications subject to RoHS regulatory requirements must account for this distinction in component selection and supply chain planning.

Packaging: The PIC16LC781-I/SO is supplied in tube packaging, which may affect handling, storage, and assembly processes compared to the original part's unspecified packaging format.

Both devices are REACH unaffected and carry EAR99 export classification. Functional interchangeability is complete at the electrical and mechanical interface level.

Frequently Asked Questions (FAQ)

Q: Can the PIC16LC781-I/SO directly replace the PIC16LC781T-I/SO in existing designs?

A: Yes. Both devices are electrically and mechanically identical. They share the same 20-SOIC package footprint, pin configuration, voltage supply range (2.7V to 5.5V), operating temperature range (-40°C to 85°C), and all functional peripherals. No circuit modifications are required.

Q: What is the difference between these two part numbers?

A: The primary differences are product status and compliance certification. The PIC16LC781T-I/SO is obsolete and ROHS3 compliant. The PIC16LC781-I/SO is active and RoHS non-compliant. All electrical and functional specifications are identical.

Q: Are there any pin or footprint differences between these parts?

A: No. Both devices use the 20-SOIC (0.295", 7.50mm Width) package with identical pin assignments and mechanical dimensions. PCB layouts and socket designs are fully compatible.

Q: Which part should be selected for new production?

A: The PIC16LC781-I/SO is recommended for new production due to its active product status, which ensures ongoing availability and manufacturer support. Compliance requirements specific to your application should be evaluated against the RoHS status of each device.

Q: Are memory specifications identical between these parts?

A: Yes. Both devices feature 1.75KB (1K x 14) OTP program memory, 128 x 8 bytes of RAM, 8-channel 8-bit A/D conversion, and 1-channel 8-bit D/A conversion. Instruction set and memory addressing are identical.

Q: What is the inventory status for these parts?

A: The PIC16LC781T-I/SO has 755 pieces in stock. The PIC16LC781-I/SO has 1059 pieces in stock. Availability may vary based on current demand and supplier inventory levels.

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