C8051F064 Equivalent & Substitute Parts

Part Overview

The C8051F064 is an 8-bit microcontroller from Silicon Labs' C8051F06x series, featuring a 25MHz 8051 core with 64KB FLASH program memory and 4.25KB RAM. This device integrates multiple communication interfaces including SPI, UART/USART, SMBus (I2C), and EBI/EMI, along with analog capabilities via dual 16-bit A/D converters. The part is currently marked as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new production requirements.

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
Data Converters	A/D 2x16b
Number of I/O	59
Connectivity	EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Mounting Type	Surface Mount
Package	100-TQFP (14x14)
Operating Temperature	-40°C ~ 85°C (TA)
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the C8051F064 is determined by strict equivalence across the following critical parameters:

Core Architecture: 8051 processor family
Memory Configuration: 64KB FLASH program memory and 4.25KB RAM
Clock Speed: 25MHz operation
Supply Voltage: 2.7V to 3.6V range
I/O Count: 59 I/O pins
Peripheral Set: Identical connectivity (SPI, UART/USART, SMBus/I2C, EBI/EMI) and support functions (Brown-out Detect/Reset, POR, PWM, WDT)
Package: 100-TQFP (14x14) form factor
Data Conversion: Dual 16-bit A/D converters

The C8051F064-GQ variant meets all these criteria and qualifies as a direct substitute based on identical electrical and mechanical specifications.

Parameter Comparison

Parameter	C8051F064	C8051F064-GQ
Manufacturer	Silicon Labs	Silicon Labs
Series	C8051F06x	C8051F06x
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
Data Converters	A/D 2x16b	A/D 2x16b
Number of I/O	59	59
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, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Mounting Type	Surface Mount	Surface Mount
Package / Case	100-TQFP (14x14)	100-TQFP (14x14)
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Not For New Designs
RoHS Status	RoHS non-compliant	RoHS Compliant

Engineering Selection Recommendations

The C8051F064-GQ is electrically and mechanically identical to the C8051F064 across all functional parameters. Selection between these parts should be based on the following factors:

Product Status: The C8051F064 is marked Obsolete, while the C8051F064-GQ is designated Not For New Designs. For legacy system maintenance and repair, either part is functionally suitable. For new production designs, neither part is recommended due to their discontinued status.

Compliance: The C8051F064-GQ carries RoHS Compliant certification, whereas the C8051F064 is RoHS non-compliant. Systems requiring RoHS compliance must use the C8051F064-GQ variant.

Packaging: The C8051F064-GQ is supplied in Tray packaging, while the C8051F064 packaging specification is not defined. Packaging selection depends on assembly process requirements and handling procedures.

Programmability Verification: The C8051F064-GQ has been verified as programmable through DiGi-Electronics channels, while the C8051F064 verification status is not confirmed. This distinction may be relevant for programming and testing workflows.

Frequently Asked Questions (FAQ)

Q: Can C8051F064-GQ replace C8051F064 in existing designs?

A: Yes. Both parts share identical electrical specifications, memory configuration, I/O count, peripheral set, and 100-TQFP package. Direct substitution is supported at the component level.

Q: What is the difference between C8051F064 and C8051F064-GQ?

A: The parts are functionally equivalent. Differences exist in product status (Obsolete vs. Not For New Designs), RoHS compliance (non-compliant vs. compliant), packaging format (unspecified vs. Tray), and programmability verification status (not verified vs. verified).

Q: Are there any pin compatibility concerns?

A: No. Both parts use the 100-TQFP (14x14) package with 59 I/O pins in identical pin assignments. PCB layouts and socket designs are fully compatible.

Q: Which part should be selected for new production?

A: Neither the C8051F064 nor C8051F064-GQ is recommended for new designs due to their discontinued status. Alternative microcontroller solutions from current product lines should be evaluated.

Q: Does RoHS compliance affect functional performance?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical or operational characteristics. Both parts perform identically in circuit operation.

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

A: Yes. Both parts operate at 2.7V to 3.6V supply voltage and function across the -40°C to 85°C temperature range.

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