C8051F303-GS Equivalent & Substitute Parts

Part Overview

The C8051F303-GS is an 8-bit microcontroller from Silicon Labs' C8051F30x series, featuring an 8051 core processor with 8KB FLASH program memory and 256 bytes of RAM. This device operates at 25MHz with integrated peripherals including PWM, watchdog timer, and power-on reset functionality. The part is currently obsolete, making substitute components necessary for new designs and production continuity. The C8051F303-GS is packaged in a 14-SOIC surface mount configuration and operates across the industrial temperature range of -40°C to 85°C.

Substiute Parts

C8051F303-GS

Silicon LabsIn Stock: 1053C8051F303-GS Datasheet

Current PartRFQ

C8051F863-C-GS

Silicon LabsIn Stock: 964C8051F863-C-GS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The C8051F863-C-GS qualifies as a functional substitute based on the following core parameters:

Matching Parameters:

• 8051 core processor architecture
• 8-Bit core size
• 25MHz operating speed
• 8KB FLASH program memory
• FLASH memory type
• Internal oscillator
• -40°C ~ 85°C operating temperature range
• Surface mount technology
• RoHS compliance
• MSL 2 rating

Differing Parameters: The C8051F863-C-GS introduces enhancements in RAM capacity (512 x 8 versus 256 x 8), expanded I/O count (13 versus 8), additional connectivity options (SPI added), enhanced peripherals (Brown-out Detect/Reset added), and a larger 16-SOIC package footprint. The supply voltage range is extended to 2.2V ~ 3.6V (lower minimum). Product status transitions from obsolete to active.

Substitution is valid when the application requirements accommodate the larger package footprint and can utilize or tolerate the additional I/O, memory, and peripheral features.

Parameter Comparison

Engineering Selection Recommendations

The C8051F863-C-GS is an active production substitute for the obsolete C8051F303-GS. Both devices maintain identical core processor architecture, clock speed, program memory capacity, and operating temperature specifications. The substitute part offers extended supply voltage range (2.2V minimum versus 2.7V), increased RAM capacity, expanded I/O capability, and additional peripheral features including brown-out detection.

Selection of the C8051F863-C-GS requires PCB layout accommodation for the 16-SOIC package (versus 14-SOIC) and firmware validation of the additional I/O pins and enhanced peripherals. Both parts maintain RoHS compliance and equivalent moisture sensitivity ratings. The substitute part's active production status ensures long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the C8051F863-C-GS directly replace the C8051F303-GS without firmware modification?

A: The C8051F863-C-GS maintains the same 8051 core architecture, clock speed, and program memory size. However, the larger 16-SOIC package requires PCB redesign. Firmware must be validated for the additional I/O pins and enhanced peripherals, particularly the brown-out detection feature.

Q: What is the primary reason for substitution?

A: The C8051F303-GS is obsolete. The C8051F863-C-GS is an active production part from the same manufacturer with compatible core specifications and enhanced capabilities.

Q: Are there package compatibility concerns?

A: Yes. The C8051F303-GS uses 14-SOIC packaging while the C8051F863-C-GS uses 16-SOIC packaging. Both maintain 0.154" width and 3.90mm pitch, but the additional pins require PCB layout modification.

Q: How do the supply voltage ranges differ?

A: The C8051F303-GS operates at 2.7V ~ 3.6V. The C8051F863-C-GS extends the lower limit to 2.2V ~ 3.6V, providing greater flexibility for low-voltage applications.

Q: What additional features does the substitute part provide?

A: The C8051F863-C-GS includes brown-out detection/reset, doubles the RAM capacity to 512 x 8 bytes, adds SPI connectivity, and increases I/O count from 8 to 13 pins.

Q: Are both parts RoHS compliant?

A: Yes. Both the C8051F303-GS and C8051F863-C-GS are RoHS compliant with MSL 2 ratings (1 Year).