C8051F311 Equivalent & Substitute Parts

Part Overview

The C8051F311 is an 8-bit microcontroller from Silicon Labs' C8051F31x series, featuring a 25MHz 8051 core with 16KB FLASH program memory and integrated peripherals including SMBus, SPI, and UART connectivity. The device is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new design considerations.

Substiute Parts

C8051F311

Silicon LabsIn Stock: 1549C8051F311 Datasheet

Current PartRFQ

C8051F311-GM

Silicon LabsIn Stock: 6428C8051F311-GM Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the C8051F311 is determined by strict equivalence across the following critical parameters:

• Core Architecture: 8051 processor family
• Memory Configuration: 16KB FLASH program memory, 1.25K x 8 RAM
• Operating Frequency: 25MHz
• Supply Voltage Range: 2.7V ~ 3.6V
• Peripheral Set: SMBus, SPI, UART/USART, POR, PWM, Temperature Sensor, WDT
• I/O Count: 25 pins
• Package Format: 28-QFN (5x5) with exposed pad
• Data Conversion: A/D 17x10b

The C8051F311-GM variant meets all electrical and mechanical equivalence criteria and is identified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The C8051F311-GM is electrically and mechanically equivalent to the C8051F311 across all functional parameters. The primary distinction is regulatory compliance: the C8051F311-GM achieves ROHS3 compliance, whereas the original C8051F311 is RoHS non-compliant. For applications subject to RoHS requirements, the C8051F311-GM is the appropriate selection. Both devices share identical core architecture, memory configuration, operating frequency, supply voltage range, peripheral set, and package format.

Frequently Asked Questions (FAQ)

Q: Can C8051F311-GM be used as a direct replacement for C8051F311?

A: Yes. The C8051F311-GM is electrically and mechanically equivalent. All functional parameters—processor core, memory size, operating frequency, supply voltage, peripherals, I/O count, and package format—are identical.

Q: What is the difference between C8051F311 and C8051F311-GM?

A: The devices are functionally identical. The C8051F311-GM differs in RoHS compliance status (ROHS3 Compliant versus RoHS non-compliant) and packaging format (Tube versus unspecified).

Q: Are there any package compatibility concerns?

A: No. Both devices use the 28-QFN (5x5) package with exposed pad. PCB footprints and mounting procedures are identical.

Q: Can these devices be used interchangeably in production?

A: Yes, provided regulatory requirements are met. For applications requiring RoHS compliance, use C8051F311-GM. Both devices maintain identical electrical characteristics and peripheral functionality.

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

A: C8051F311 is classified as Obsolete, indicating end-of-life status. C8051F311-GM is classified as Not For New Designs, indicating limited availability and manufacturer recommendation against new design integration. Both statuses reflect the age of the C8051F31x series.