C8051F044 Equivalent & Substitute Parts

Part Overview

The C8051F044 is an 8-bit microcontroller from Silicon Labs' C8051F04x series, featuring a 25MHz 8051 core with 64KB Flash memory and integrated peripherals including CANbus, I2C, SPI, and UART connectivity. The device is classified as Obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and component sourcing in production environments.

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	64
Data Converters	A/D 13x10b
Connectivity	CANbus, EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Package	100-TQFP (14x14)
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the C8051F044 is determined by strict equivalence across core electrical and mechanical parameters. The primary substitute identified is the C8051F044-GQ, which maintains identical specifications across all critical dimensions:

Key Parameters for Substitution Equivalence:

Core processor architecture (8051)
Core size (8-Bit)
Operating frequency (25MHz)
Program memory capacity and type (64KB FLASH)
RAM capacity (4.25K x 8)
Supply voltage range (2.7V ~ 3.6V)
I/O count (64 pins)
Data converter specifications (A/D 13x10b)
Connectivity interfaces (CANbus, EBI/EMI, SMBus, SPI, UART/USART)
Peripheral feature set (Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT)
Package form factor (100-TQFP 14x14)
Operating temperature range (-40°C ~ 85°C)

Parameter Comparison

Parameter	C8051F044	C8051F044-GQ	Match
Manufacturer	Silicon Labs	Silicon Labs	✓
Series	C8051F04x	C8051F04x	✓
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	✓
Number of I/O	64	64	✓
Data Converters	A/D 13x10b	A/D 13x10b	✓
Connectivity	CANbus, EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART	CANbus, 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	✓
Package / Case	100-TQFP (14x14)	100-TQFP (14x14)	✓
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Mounting Type	Surface Mount	Surface Mount	✓
ECCN	EAR99	EAR99	✓
HTSUS	8542.31.0001	8542.31.0001	✓
Product Status	Obsolete	Not For New Designs	Different
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Different
Packaging	Not specified	Tray	Different

Engineering Selection Recommendations

The C8051F044-GQ is a direct functional equivalent to the C8051F044, with identical electrical and mechanical specifications across all critical parameters. Selection between these parts should be based on the following factors:

Product Status Consideration: The C8051F044 is classified as Obsolete, while the C8051F044-GQ is classified as Not For New Designs. For legacy system maintenance and repair, either part is functionally suitable. For new design work, neither part is recommended by the manufacturer.

Compliance Advantage: The C8051F044-GQ offers ROHS3 compliance and REACH Unaffected status, compared to the C8051F044's RoHS non-compliant classification. This distinction is relevant for applications subject to environmental regulations or customer compliance requirements.

Packaging and Availability: The C8051F044-GQ is supplied in Tray packaging with verified programmability status and higher inventory availability (4881 Pcs vs. 1405 Pcs), making it the preferred choice for production sourcing when equivalent functionality is required.

Frequently Asked Questions (FAQ)

Q: Can C8051F044-GQ be used as a direct replacement for C8051F044?

A: Yes. The C8051F044-GQ is electrically and mechanically equivalent to the C8051F044 across all specified parameters, including core processor, memory configuration, I/O count, voltage supply range, connectivity interfaces, and package form factor. No circuit modifications are required for substitution.

Q: What is the difference between C8051F044 and C8051F044-GQ?

A: The primary differences are product status classification, RoHS compliance level, and packaging format. The C8051F044-GQ offers ROHS3 compliance versus non-compliance, Tray packaging versus unspecified packaging, and verified programmability status. Functional specifications are identical.

Q: Are there any pin compatibility concerns when substituting C8051F044-GQ for C8051F044?

A: No. Both parts use the identical 100-TQFP (14x14) package with 64 I/O pins. Pin assignments, signal definitions, and electrical characteristics are equivalent. Direct PCB-level substitution is supported without layout modifications.

Q: Which part should be selected for new designs?

A: Neither the C8051F044 nor C8051F044-GQ is recommended for new designs, as both are classified as Obsolete or Not For New Designs. Alternative current-generation microcontrollers from Silicon Labs should be evaluated for new development projects.

Q: Is the C8051F044-GQ suitable for applications requiring RoHS compliance?

A: Yes. The C8051F044-GQ is ROHS3 compliant and REACH Unaffected, making it suitable for applications with environmental compliance requirements. The original C8051F044 is RoHS non-compliant and should not be used in RoHS-regulated applications.

Q: What is the impact of different product status classifications on component selection?

A: Product status indicates manufacturer support and design recommendations. Obsolete status means the part is no longer manufactured or supported. Not For New Designs indicates the part is available but not recommended for new development. For legacy system support, either classification is acceptable. For new projects, alternative parts should be sourced.

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