C8051F065 Equivalent & Substitute Parts

Part Overview

The C8051F065 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 SMBus (I2C), SPI, and UART connectivity alongside peripheral functions including brown-out detection, power-on reset, PWM, and watchdog timer capabilities in a 64-TQFP surface mount package.

The C8051F065 carries an Obsolete product status, making it necessary to identify functionally equivalent alternatives for new designs and ongoing production support. The primary substitute, C8051F065-GQ, maintains identical electrical and mechanical specifications while offering improved compliance status and availability.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Speed	25MHz
Program Memory Size	64KB (64K x 8) FLASH
RAM Size	4.25K x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 3.6V
Data Converters	A/D 2x16b
Connectivity	SMBus (2-Wire/I2C), SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O	24
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	64-TQFP (10x10)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the C8051F065 is determined by strict equivalence across the following critical parameters:

Core Architecture & Performance: 8051 core processor, 8-bit, 25MHz operation
Memory Configuration: 64KB FLASH program memory, 4.25KB RAM
Electrical Specifications: 2.7V to 3.6V supply voltage range, identical A/D converter configuration (2x16b)
Connectivity & Peripherals: SMBus/I2C, SPI, UART/USART support; brown-out detection, POR, PWM, WDT functions
I/O Count: 24 I/O pins
Package & Thermal: 64-TQFP (10x10) surface mount package, -40°C to 85°C operating range, MSL 3

The C8051F065-GQ maintains 100% electrical and mechanical compatibility with the C8051F065, differing only in packaging format (Tray vs. standard) and compliance certifications.

Parameter Comparison

Parameter	C8051F065	C8051F065-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) FLASH	64KB (64K x 8) 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
Connectivity	SMBus (2-Wire/I2C), SPI, UART/USART	SMBus (2-Wire/I2C), SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O	24	24
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
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Not For New Designs
RoHS Status	RoHS non-compliant	ROHS3 Compliant
ECCN	EAR99	EAR99
HTSUS	8542.31.0001	8542.31.0001

Engineering Selection Recommendations

For Obsolete Design Replacement: The C8051F065-GQ is the direct functional equivalent for applications currently using the C8051F065. Both devices share identical core architecture, memory configuration, and peripheral integration, ensuring pin-for-pin and software compatibility.

Compliance Considerations: The C8051F065-GQ offers ROHS3 compliance, whereas the original C8051F065 is RoHS non-compliant. For new production runs or designs subject to RoHS regulations, the C8051F065-GQ is the appropriate selection.

Product Status: The C8051F065 is classified as Obsolete, while the C8051F065-GQ carries a "Not For New Designs" status. For ongoing support and component availability, the C8051F065-GQ provides superior long-term sourcing reliability.

Packaging & Handling: Both parts maintain identical MSL 3 moisture sensitivity specifications (168-hour floor life). The C8051F065-GQ is supplied in Tray packaging, which may affect handling and storage procedures compared to standard packaging formats.

Frequently Asked Questions (FAQ)

Q: Can C8051F065-GQ be used as a direct replacement for C8051F065?

A: Yes. The C8051F065-GQ is electrically and mechanically identical to the C8051F065. All functional parameters—processor core, clock speed, memory configuration, I/O count, voltage range, and peripheral set—are equivalent. No design modifications are required for substitution.

Q: What are the key differences between C8051F065 and C8051F065-GQ?

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

Q: Are there any pin compatibility concerns when switching from C8051F065 to C8051F065-GQ?

A: No. Both devices use the 64-TQFP (10x10) package with 24 I/O pins in identical pin configurations. PCB layout and footprints require no modification.

Q: Does the C8051F065-GQ support the same communication protocols as the C8051F065?

A: Yes. Both parts integrate SMBus (2-Wire/I2C), SPI, and UART/USART connectivity. Firmware and protocol implementations are fully compatible.

Q: What is the significance of the MSL 3 rating for both parts?

A: MSL 3 indicates a 168-hour floor life after moisture exposure. Both the C8051F065 and C8051F065-GQ require identical moisture control and handling procedures during storage and assembly.

Q: Is the C8051F065-GQ suitable for new product designs?

A: The C8051F065-GQ carries a "Not For New Designs" status, indicating it is in the later stages of its product lifecycle. For new designs requiring long-term support, evaluation of current-generation alternatives within the C8051 family is recommended based on specific application requirements.

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