C8051F702-GQ Equivalent & Substitute Parts

Part Overview

The C8051F702-GQ is an 8-bit microcontroller from Silicon Labs' C8051F70x series, featuring a 25MHz 8051 core with 16KB FLASH memory and integrated peripherals including SPI, UART, I2C, and PWM functionality. The device is packaged in a 64-TQFP form factor and operates across a 1.8V to 3.6V supply range.

This part is classified as obsolete. Identifying equivalent and substitute components is necessary to support legacy system maintenance, design updates, and procurement continuity when original inventory becomes unavailable.

Substiute Parts

C8051F702-GQ

Silicon LabsIn Stock: 813C8051F702-GQ Datasheet

Current PartRFQ

PIC16F1946-I/PT

Microchip TechnologyIn Stock: 24095PIC16F1946-I/PT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute relationships for the C8051F702-GQ are determined by the following critical parameters:

• Package Compatibility: 64-TQFP (10x10) form factor for direct PCB footprint compatibility
• Core Size: 8-Bit architecture for software and instruction set compatibility
• Memory Configuration: FLASH-based program memory with comparable capacity (14KB–16KB range)
• I/O Count: 54 I/O pins to maintain peripheral connectivity
• Operating Temperature Range: -40°C ~ 85°C for thermal envelope compatibility
• Supply Voltage Range: Overlap within 1.8V ~ 3.6V or extended ranges (1.8V ~ 5.5V)
• Connectivity Interfaces: SPI, UART/USART, and I2C support for protocol compatibility

The PIC16F1946-I/PT meets these substitution criteria through matching package, I/O count, memory type, and operating temperature specifications, while offering enhanced speed (32MHz) and extended voltage tolerance.

Parameter Comparison

Engineering Selection Recommendations

The PIC16F1946-I/PT qualifies as a functional substitute for the C8051F702-GQ based on the following engineering criteria:

Mechanical Compatibility: Both devices use identical 64-TQFP (10x10) packaging, enabling direct PCB footprint replacement without layout modifications.

Electrical Compatibility: Matching I/O count (54 pins), identical RAM configuration (512 x 8), and overlapping operating temperature range (-40°C ~ 85°C) ensure electrical interface compatibility. The PIC16F1946-I/PT extends the supply voltage range to 1.8V ~ 5.5V, providing greater flexibility in power supply design.

Product Status and Availability: The C8051F702-GQ is classified as obsolete, while the PIC16F1946-I/PT maintains active production status with verified inventory availability (24,050 units in stock), ensuring long-term procurement reliability.

Compliance and Certifications: The PIC16F1946-I/PT carries RoHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. Both devices share identical Moisture Sensitivity Level (MSL 3, 168 Hours) and HTSUS classification.

Performance Enhancement: The substitute offers increased clock speed (32MHz vs. 25MHz), additional EEPROM (256 x 8), and one additional A/D converter channel (17x10b vs. 16x10b), providing performance headroom for legacy system upgrades.

Architectural Difference: The core processor architecture differs (PIC vs. 8051), requiring firmware porting and validation. This is a design-level consideration, not a substitution barrier, when legacy code migration is feasible.

Frequently Asked Questions (FAQ)

Q: Can the PIC16F1946-I/PT be used as a direct drop-in replacement for the C8051F702-GQ?

A: The PIC16F1946-I/PT provides mechanical and electrical pin compatibility through identical 64-TQFP packaging and matching I/O count. However, the different core processor architecture (PIC vs. 8051) requires firmware porting. PCB-level substitution is feasible; firmware compatibility requires code migration and validation.

Q: What are the key compatibility parameters for substitution?

A: Package type (64-TQFP), I/O count (54 pins), memory type (FLASH), operating temperature range (-40°C ~ 85°C), and supply voltage overlap (1.8V ~ 3.6V minimum) are the primary substitution criteria. Connectivity interfaces (SPI, UART, I2C) must also align with system requirements.

Q: Does the PIC16F1946-I/PT support the same communication protocols?

A: Both devices support SPI, UART/USART, and I2C interfaces. The C8051F702-GQ includes SMBus and EBI/EMI connectivity, while the PIC16F1946-I/PT adds LINbus support and LCD peripheral capability. Protocol compatibility depends on specific application requirements.

Q: What is the impact of the extended voltage range on the PIC16F1946-I/PT?

A: The PIC16F1946-I/PT operates across 1.8V ~ 5.5V, compared to the C8051F702-GQ's 1.8V ~ 3.6V range. This extended range provides greater flexibility in power supply design and may reduce voltage regulation requirements in certain applications. Existing 1.8V ~ 3.6V designs remain fully compatible.

Q: Are there memory capacity differences that affect substitution?

A: The C8051F702-GQ provides 16KB FLASH, while the PIC16F1946-I/PT provides 14KB FLASH. For applications requiring the full 16KB capacity, memory constraints may apply. The PIC16F1946-I/PT compensates with 256 x 8 EEPROM, which the C8051F702-GQ lacks.

Q: What is the significance of the obsolete product status?

A: The C8051F702-GQ is classified as obsolete, indicating discontinued production and limited future availability. The PIC16F1946-I/PT maintains active production status with substantial inventory, ensuring long-term procurement reliability and support for legacy system maintenance and upgrades.