C8051F321 Equivalent & Substitute Parts

Part Overview

The C8051F321 is an 8-bit microcontroller from Silicon Labs' C8051F32x series, featuring a 25MHz 8051 core with 16KB FLASH program memory and 2.25KB RAM. The device integrates multiple communication interfaces (SMBus/I2C, SPI, UART/USART, USB) and analog capabilities including a 13-bit 10-channel A/D converter. The main part is classified as Obsolete, making substitute identification critical for ongoing production and maintenance applications.

Substiute Parts

C8051F321

Silicon LabsIn Stock: 1871C8051F321 Datasheet

Current PartRFQ

C8051F321-GM

Silicon LabsIn Stock: 2054C8051F321-GM Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the C8051F321 is determined by strict equivalence across the following critical parameters:

• Core processor architecture (8051)
• Core size (8-Bit)
• Operating frequency (25MHz)
• Program memory capacity and type (16KB FLASH)
• RAM capacity (2.25K x 8)
• Supply voltage range (2.7V ~ 3.6V)
• Analog converter specification (A/D 13x10b)
• I/O count (21 pins)
• Communication interfaces (SMBus/I2C, SPI, UART/USART, USB)
• Peripheral feature set (Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT)
• Package type (28-VFQFN Exposed Pad)
• Operating temperature range (-40°C ~ 85°C)

The C8051F321-GM meets all these criteria and qualifies as a direct substitute. Packaging variation (Tube vs. standard) does not affect functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

The C8051F321-GM is a functionally equivalent substitute for the C8051F321 across all electrical and mechanical specifications. Both devices share identical core architecture, memory configuration, I/O count, and peripheral feature set.

Key differentiation factors:

• The C8051F321-GM carries ROHS3 compliance status, whereas the original C8051F321 is RoHS non-compliant. This distinction is significant for applications subject to RoHS regulatory requirements.
• The C8051F321-GM is designated "Not For New Designs," indicating Silicon Labs' recommendation against use in new product development. The C8051F321 carries "Obsolete" status, indicating end-of-life classification.
• Both devices are classified as end-of-life or restricted from new designs, reflecting the maturity of the C8051F32x series.

Selection between these parts should be based on regulatory compliance requirements and supply chain availability rather than functional capability.

Frequently Asked Questions (FAQ)

Q: Can the C8051F321-GM replace the C8051F321 in existing designs?

A: Yes. The C8051F321-GM is electrically and mechanically equivalent to the C8051F321. All functional parameters, including processor core, memory configuration, I/O count, communication interfaces, and peripheral features, are identical. Pin-to-pin compatibility and package dimensions are unchanged.

Q: What is the difference between the C8051F321 and C8051F321-GM?

A: The primary differences are product status and RoHS compliance. The C8051F321-GM is ROHS3 compliant, while the C8051F321 is RoHS non-compliant. The C8051F321-GM is designated "Not For New Designs," whereas the C8051F321 is classified as "Obsolete." These distinctions reflect regulatory and lifecycle status rather than functional capability.

Q: Are there packaging differences between C8051F321 and C8051F321-GM?

A: Both devices use the 28-VFQFN Exposed Pad package. The C8051F321-GM is supplied in Tube packaging, while the C8051F321 uses standard packaging. This difference does not affect electrical performance or PCB integration.

Q: What supply voltage range does the C8051F321-GM support?

A: The C8051F321-GM operates across a supply voltage range of 2.7V to 3.6V, identical to the C8051F321. This range supports both 3.3V and lower-voltage applications within the specified limits.

Q: Is the C8051F321-GM suitable for new product designs?

A: The C8051F321-GM carries a "Not For New Designs" designation from Silicon Labs. While functionally equivalent to the C8051F321, both devices are end-of-life or restricted from new development. Alternative microcontroller solutions from current product lines should be evaluated for new designs.