C8051F331 Equivalent & Substitute Parts

Part Overview

The C8051F331 is an 8-bit microcontroller from Silicon Labs' C8051F33x series, featuring an 8051 core processor with 25MHz operation, 8KB FLASH program memory, and 768 bytes of RAM. The device integrates SMBus (2-Wire/I2C), SPI, and UART/USART connectivity with peripheral support for Power-On Reset (POR), Pulse Width Modulation (PWM), and Watchdog Timer (WDT) functions. Housed in a 20-pin MLP (4x4) surface mount package, it operates across a 2.7V to 3.6V supply range and -40°C to 85°C temperature range.

The C8051F331 carries an Obsolete product status, making substitute part identification essential for ongoing system support and new design considerations. Direct manufacturer equivalents with updated compliance certifications are available to maintain design continuity.

Substiute Parts

C8051F331

Silicon LabsIn Stock: 1227C8051F331 Datasheet

Current PartRFQ

C8051F331-GM

Silicon LabsIn Stock: 1690C8051F331-GM Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the C8051F331 is determined by strict equivalence across the following critical parameters:

• Core Architecture: 8051 processor family
• Memory Configuration: 8KB FLASH program memory and 768 bytes RAM
• Clock Speed: 25MHz operation
• I/O Count: 17 I/O pins
• Connectivity Interfaces: SMBus (2-Wire/I2C), SPI, UART/USART
• Peripheral Set: POR, PWM, WDT
• Supply Voltage Range: 2.7V ~ 3.6V
• Package Form Factor: 20-pin MLP (4x4) surface mount
• Temperature Range: -40°C ~ 85°C

The C8051F331-GM represents a direct manufacturer equivalent, maintaining identical electrical and mechanical specifications while offering updated product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The C8051F331-GM is a direct functional equivalent to the C8051F331, maintaining complete electrical and mechanical compatibility. Selection between these parts should be based on the following criteria:

For Existing Designs: The C8051F331 remains suitable for in-service applications where inventory is available and RoHS compliance is not a procurement requirement.

For New Designs and Procurement: The C8051F331-GM is the appropriate selection due to its RoHS Compliant status and "Not For New Designs" classification, which indicates manufacturer support for ongoing production use. This part carries improved environmental compliance certification while maintaining identical functional specifications.

Compliance Considerations: Organizations subject to RoHS directives or environmental regulations should prioritize the C8051F331-GM. Both parts share identical ECCN (EAR99) and HTSUS (8542.31.0001) classifications, with no export control or tariff implications affecting substitution decisions.

Frequently Asked Questions (FAQ)

Q: Can the C8051F331-GM be used as a direct replacement for the C8051F331?

A: Yes. The C8051F331-GM is electrically and mechanically identical to the C8051F331. All functional parameters, memory configurations, I/O counts, connectivity interfaces, and package specifications are equivalent. No circuit modifications or firmware changes are required.

Q: What is the primary difference between these two parts?

A: The C8051F331-GM carries RoHS Compliant certification, while the C8051F331 is RoHS non-compliant. Additionally, the C8051F331-GM has a "Not For New Designs" status, indicating it is suitable for production use, whereas the C8051F331 is classified as Obsolete.

Q: Are there any packaging differences?

A: No. Both parts use identical 20-pin MLP (4x4) surface mount packaging with 20-VFQFN Exposed Pad configuration. Footprint, pin assignment, and PCB layout compatibility are identical.

Q: Which part should be selected for new product designs?

A: The C8051F331-GM is the appropriate choice for new designs. While classified as "Not For New Designs," this designation reflects manufacturer lifecycle management rather than functional limitations. The part maintains full production support and RoHS compliance, making it suitable for new applications.

Q: Are the supply voltage and operating temperature ranges identical?

A: Yes. Both parts operate across 2.7V to 3.6V supply voltage and -40°C to 85°C temperature range. No derating or thermal management differences apply between the two variants.

Q: Do these parts have identical memory specifications?

A: Yes. Both the C8051F331 and C8051F331-GM feature 8KB FLASH program memory, 768 bytes of RAM, and identical internal oscillator configuration. Memory access timing and performance are equivalent.