C8051F043R Equivalent & Substitute Parts

Part Overview

The C8051F043R is an 8-bit microcontroller from Silicon Labs' C8051F04x series, featuring a 25MHz 8051 core with 64KB Flash memory and integrated peripherals including CANbus, SPI, UART, and analog converters. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new production alternatives.

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
Number of I/O	32
Connectivity	CANbus, EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART
Data Converters	A/D 8x8b, 13x10b; D/A 2x10b, 2x12b
Peripherals	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Package	64-TQFP (10x10)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the C8051F043R is determined by strict equivalence across the following critical parameters:

Core Architecture: 8051 processor family
Memory Configuration: 64KB Flash, 4.25K RAM
Operating Frequency: 25MHz
Supply Voltage Range: 2.7V ~ 3.6V
Peripheral Set: CANbus, SPI, UART/USART, SMBus, PWM, temperature sensor, watchdog timer
I/O Count: 32 pins
Package Form Factor: 64-TQFP (10x10)
Thermal Range: -40°C ~ 85°C

The C8051F043-GQ is a direct equivalent part from Silicon Labs, maintaining identical electrical and functional specifications while differing in packaging format (Tray vs. standard packaging) and product lifecycle status.

Parameter Comparison

Parameter	C8051F043R	C8051F043-GQ
Manufacturer	Silicon Labs	Silicon Labs
Series	C8051F04x	C8051F04x
Core Processor	8051	8051
Core Size	8-Bit	8-Bit
Speed	25MHz	25MHz
Program Memory	64KB FLASH	64KB FLASH
RAM Size	4.25K x 8	4.25K x 8
Voltage Supply	2.7V ~ 3.6V	2.7V ~ 3.6V
Number of I/O	32	32
Connectivity	CANbus, EBI/EMI, SMBus, SPI, UART/USART	CANbus, EBI/EMI, SMBus, SPI, UART/USART
Data Converters	A/D 8x8b, 13x10b; D/A 2x10b, 2x12b	A/D 8x8b, 13x10b; D/A 2x10b, 2x12b
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	-40°C ~ 85°C
Package	64-TQFP (10x10)	64-TQFP (10x10)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Not For New Designs
RoHS Status	RoHS non-compliant	RoHS Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The C8051F043-GQ serves as the direct functional equivalent to the C8051F043R. Selection between these parts is determined by lifecycle and compliance requirements:

C8051F043R is suitable for legacy system maintenance and repair where existing inventory or design documentation specifies this exact part number. The RoHS non-compliant status restricts use in new designs subject to RoHS regulations.

C8051F043-GQ is the preferred selection for new designs and production environments requiring RoHS compliance. Despite its "Not For New Designs" status from the manufacturer, it maintains full electrical and functional compatibility with the C8051F043R. The Tray packaging format accommodates high-volume manufacturing processes.

Both parts share identical core specifications, memory configuration, peripheral integration, and thermal operating range, ensuring direct substitution at the circuit level without design modification.

Frequently Asked Questions (FAQ)

Q: Can C8051F043-GQ replace C8051F043R in existing designs?

A: Yes. Both parts are electrically and functionally identical across all specified parameters. The primary differences are packaging format (Tray vs. standard) and RoHS compliance status. No circuit modifications are required.

Q: What is the significance of the "Not For New Designs" status on C8051F043-GQ?

A: This manufacturer designation indicates the part is in mature lifecycle phase. However, it remains fully functional and available. The status reflects Silicon Labs' product roadmap rather than technical limitations. For new production, verify long-term availability with your distributor.

Q: Are there pin-to-pin compatibility differences between these parts?

A: No. Both parts use the 64-TQFP (10x10) package with identical pinout and 32 I/O configuration. PCB layout and footprint are interchangeable.

Q: Does the Tray packaging of C8051F043-GQ affect performance?

A: No. Packaging format affects only handling, storage, and manufacturing processes. Electrical performance and functional specifications remain identical.

Q: What is the impact of RoHS compliance differences?

A: C8051F043R is RoHS non-compliant, restricting its use in applications or markets with RoHS regulatory requirements. C8051F043-GQ is RoHS Compliant, meeting EU Directive 2011/65/EU and equivalent regulations. Select based on your application's regulatory environment

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