C8051F045 Equivalent & Substitute Parts

Part Overview

The C8051F045 is an 8-bit microcontroller from Silicon Labs' C8051F04x series, featuring a 25MHz 8051 core with 64KB FLASH program memory and integrated peripherals including CANbus, SPI, UART/USART, and SMBus connectivity. The main part number C8051F045 is classified as Obsolete, making substitute parts necessary for new procurement and ongoing system support. The C8051F045-GQ variant provides a direct functional equivalent with improved compliance status and higher inventory 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 13x10b
Number of I/O	32
Connectivity	CANbus, EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Package Type	64-TQFP (10x10)
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the C8051F045 is determined by strict equivalence across the following critical parameters:

Core Architecture & Performance: 8051 core processor, 8-bit size, 25MHz speed
Memory Configuration: 64KB FLASH program memory, 4.25K x 8 RAM
Electrical Specifications: 2.7V ~ 3.6V supply voltage range, A/D 13x10b data converter
Connectivity & Peripherals: CANbus, EBI/EMI, SMBus, SPI, UART/USART, Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Physical Package: 64-TQFP (10x10) surface mount configuration
Operating Range: -40°C ~ 85°C temperature specification

The C8051F045-GQ meets all these criteria as a direct functional equivalent, differing only in packaging format (Tray vs. standard) and compliance certifications.

Parameter Comparison

Parameter	C8051F045	C8051F045-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
Data Converters	A/D 13x10b	A/D 13x10b
Number of I/O	32	32
Connectivity	CANbus, EBI/EMI, SMBus, SPI, UART/USART	CANbus, EBI/EMI, SMBus, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Package / Case	64-TQFP (10x10)	64-TQFP (10x10)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
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)
ECCN	EAR99	EAR99
HTSUS	8542.31.0001	8542.31.0001

Engineering Selection Recommendations

C8051F045-GQ is the direct substitute for C8051F045. Selection rationale:

Functional Equivalence: Identical core architecture, memory configuration, speed, and peripheral set ensure pin-for-pin and software compatibility
Compliance Advantage: C8051F045-GQ carries RoHS Compliant certification, whereas the original C8051F045 is RoHS non-compliant, meeting modern regulatory requirements
Product Status: C8051F045-GQ is classified as "Not For New Designs" compared to the "Obsolete" status of C8051F045, providing extended availability for existing system support
Inventory Availability: C8051F045-GQ demonstrates significantly higher stock levels (5347 Pcs vs. 927 Pcs), ensuring supply continuity
Packaging Format: Both parts use identical 64-TQFP (10x10) surface mount packages; the Tray packaging of C8051F045-GQ is a standard industrial format compatible with automated assembly processes

Frequently Asked Questions (FAQ)

Q: Is C8051F045-GQ a direct pin-for-pin replacement for C8051F045?

A: Yes. Both parts feature identical 64-TQFP (10x10) package configurations with 32 I/O pins. Core processor, memory, speed, voltage specifications, and peripheral sets are functionally equivalent, ensuring direct substitution without circuit redesign.

Q: What is the difference between C8051F045 and C8051F045-GQ?

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

Q: Can C8051F045-GQ be used in applications originally designed for C8051F045?

A: Yes. Identical electrical specifications, memory configuration, peripheral set, and package pinout ensure full compatibility. No firmware or hardware modifications are required.

Q: What does "Not For New Designs" mean for C8051F045-GQ?

A: This classification indicates the part is available for existing system support and replacement applications but is not recommended for new product development. For long-term new designs, consult Silicon Labs for current-generation alternatives within the C8051 family.

Q: Are there any temperature or voltage operating range differences?

A: No. Both C8051F045 and C8051F045-GQ operate across identical ranges: -40°C ~ 85°C (TA) and 2.7V ~ 3.6V supply voltage.

Q: Does the Tray packaging of C8051F045-GQ affect compatibility?

A: No. Tray packaging is a standard industrial format for surface mount components and is fully compatible with automated assembly equipment. The die, pinout, and electrical characteristics remain unchanged.

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