C8051F021R Equivalent & Substitute Parts

Part Overview

The C8051F021R is an 8-bit microcontroller from Silicon Labs' C8051F02x series, featuring a 25MHz 8051 core with 64KB Flash memory and integrated analog/digital conversion capabilities. This device is classified as Obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and component sourcing.

The C8051F021R is designed for embedded applications requiring mixed-signal processing with integrated peripherals including PWM, temperature sensing, and watchdog timer functionality. Due to its obsolete status, identifying compatible alternatives ensures design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Speed	25MHz
Program Memory Size	64KB (64K x 8)
Program Memory Type	FLASH
RAM Size	4.25K x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 3.6V
Number of I/O	32
Data Converters	A/D 8x8b, 8x12b; D/A 2x12b
Connectivity	EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	64-TQFP (10x10)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the C8051F021R is determined by strict equivalence across the following critical parameters:

Core Architecture: 8051 processor core
Memory Configuration: 64KB Flash program memory, 4.25K x 8 RAM
Clock Speed: 25MHz operation
Voltage Range: 2.7V to 3.6V supply compatibility
Package: 64-TQFP (10x10) surface mount form factor
Peripheral Set: Identical connectivity (I2C, SPI, UART) and integrated functions (PWM, temperature sensor, watchdog timer)
I/O Count: 32 I/O pins

The C8051F021-GQ qualifies as a direct substitute based on identical electrical specifications, core architecture, memory capacity, and package configuration. Differences in product status and compliance certifications do not affect functional equivalence.

Parameter Comparison

Parameter	C8051F021R	C8051F021-GQ
Manufacturer	Silicon Labs	Silicon Labs
Series	C8051F02x	C8051F02x
Core Processor	8051	8051
Core Size	8-Bit	8-Bit
Speed	25MHz	25MHz
Program Memory Size	64KB (64K x 8)	64KB (64K x 8)
Program Memory Type	FLASH	FLASH
RAM Size	4.25K x 8	4.25K x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 3.6V	2.7V ~ 3.6V
Number of I/O	32	32
Data Converters	A/D 8x8b, 8x12b; D/A 2x12b	A/D 8x8b, 8x12b; D/A 2x12b
Connectivity	EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART	EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	64-TQFP (10x10)	64-TQFP (10x10)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Not For New Designs
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging	Not specified	Tray

Engineering Selection Recommendations

The C8051F021-GQ provides functional equivalence to the C8051F021R across all electrical and mechanical parameters. Selection between these parts should be based on the following factors:

Product Status: The C8051F021R is classified as Obsolete, while the C8051F021-GQ is designated Not For New Designs. For legacy system maintenance and repair, either part is functionally suitable. For new development, neither part is recommended by the manufacturer.

Compliance: The C8051F021-GQ meets ROHS3 compliance and REACH Unaffected status, providing regulatory advantages over the non-compliant C8051F021R. Systems requiring environmental compliance certification should prioritize the C8051F021-GQ.

Packaging: The C8051F021-GQ is supplied in Tray packaging, while the C8051F021R packaging is unspecified. Verify packaging requirements for your assembly process.

Programmability: The C8051F021-GQ is verified as programmable through DiGi-Electronics, while the C8051F021R status is not verified. This distinction may affect programming and development workflows.

Frequently Asked Questions (FAQ)

Q: Can the C8051F021-GQ directly replace the C8051F021R in existing designs?

A: Yes. Both parts share identical core architecture, memory configuration, clock speed, voltage specifications, I/O count, peripheral set, and 64-TQFP package. No design modifications are required for functional substitution.

Q: What are the key differences between these parts?

A: The primary differences are product status (Obsolete vs. Not For New Designs), RoHS compliance (non-compliant vs. ROHS3 Compliant), and packaging specification (unspecified vs. Tray). Electrical and mechanical specifications are identical.

Q: Are there any pin compatibility concerns?

A: No. Both parts use the 64-TQFP (10x10) package with 32 I/O pins in identical configurations. PCB layouts and socket designs are fully compatible.

Q: Which part should be selected for new applications?

A: Neither part is recommended for new designs. The C8051F021R is Obsolete, and the C8051F021-GQ is designated Not For New Designs. Consult Silicon Labs for current-generation alternatives within the C8051 family or successor product lines.

Q: Does RoHS compliance affect functional performance?

A: No. RoHS compliance relates to material composition and environmental standards, not electrical performance or functionality. Both parts operate identically within specified parameters.

Q: Are firmware and software compatible between these parts?

A: Yes. Identical processor core, memory architecture, and peripheral configuration ensure complete software compatibility. Existing firmware requires no modification.

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