C8051F320 Equivalent & Substitute Parts

Part Overview

The C8051F320 is an 8-bit microcontroller from Silicon Labs' C8051F32x series, featuring a 25MHz 8051 core with 16KB FLASH program memory and 2.25KB RAM. The device integrates multiple communication interfaces (SMBus/I2C, SPI, UART/USART, USB) and analog capabilities (17-channel 10-bit A/D converter), making it suitable for embedded control applications requiring mixed-signal processing.

The main part number C8051F320 carries an Obsolete product status, necessitating identification of functionally equivalent alternatives for ongoing system support and new production requirements. The substitute part C8051F320-GQ provides direct functional equivalence with improved compliance characteristics.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Speed	25MHz
Program Memory Size	16KB (16K x 8) FLASH
RAM Size	2.25K x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 3.6V
Data Converters	A/D 17x10b
Number of I/O	25
Connectivity	SMBus (2-Wire/I2C), SPI, UART/USART, USB
Peripherals	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	32-LQFP (7x7)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the C8051F320 is determined by strict equivalence across the following critical parameters:

Core Architecture: 8051 processor core
Memory Configuration: 16KB FLASH program memory, 2.25KB RAM
Clock Speed: 25MHz maximum operating frequency
Voltage Range: 2.7V to 3.6V supply compatibility
I/O Count: 25 I/O pins minimum
Connectivity Interfaces: SMBus/I2C, SPI, UART/USART, USB support
Analog Capability: 17-channel 10-bit A/D converter
Package Format: 32-LQFP (7x7mm) surface mount
Thermal Range: -40°C to 85°C operating specification

The C8051F320-GQ meets all electrical and mechanical parameters required for direct substitution. Both parts share identical core specifications, memory architecture, peripheral integration, and physical packaging. Differentiation exists only in product lifecycle status and compliance certifications.

Parameter Comparison

Parameter	C8051F320	C8051F320-GQ
Manufacturer	Silicon Labs	Silicon Labs
Series	C8051F32x	C8051F32x
Core Processor	8051	8051
Core Size	8-Bit	8-Bit
Speed	25MHz	25MHz
Program Memory Size	16KB (16K x 8) FLASH	16KB (16K x 8) FLASH
RAM Size	2.25K x 8	2.25K x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 3.6V	2.7V ~ 3.6V
Data Converters	A/D 17x10b	A/D 17x10b
Number of I/O	25	25
Connectivity	SMBus (2-Wire/I2C), SPI, UART/USART, USB	SMBus (2-Wire/I2C), SPI, UART/USART, USB
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 (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	32-LQFP (7x7)	32-LQFP (7x7)
Supplier Device Package	32-LQFP (7x7)	32-LQFP (7x7)
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
ECCN	EAR99	EAR99
HTSUS	8542.31.0001	8542.31.0001
Product Status	Obsolete	Not For New Designs
RoHS Status	RoHS non-compliant	ROHS3 Compliant
REACH Status	Not specified	REACH Unaffected

Engineering Selection Recommendations

For Existing Production Systems: The C8051F320-GQ provides direct functional replacement for C8051F320 applications. Electrical and mechanical compatibility is complete across all specified parameters. No circuit redesign or firmware modification is required.

For New Designs: The C8051F320-GQ is classified as "Not For New Designs," indicating Silicon Labs' transition away from this product line. While functionally suitable for immediate requirements, long-term availability should be evaluated against alternative microcontroller platforms.

Compliance Considerations: The C8051F320-GQ offers improved regulatory compliance with ROHS3 certification and REACH Unaffected status, compared to the RoHS non-compliant C8051F320. Systems requiring environmental compliance standards should prioritize the C8051F320-GQ variant.

Packaging and Supply: The C8051F320-GQ is supplied in Tray packaging with verified programmability status and higher current inventory availability (2242 units vs. 1212 units for the main part number).

Frequently Asked Questions (FAQ)

Q: Can C8051F320-GQ be used as a direct replacement for C8051F320 in existing designs?

A: Yes. Both parts share identical electrical specifications, memory configuration, peripheral integration, and 32-LQFP package format. No circuit modifications are required for substitution.

Q: What is the difference between C8051F320 and C8051F320-GQ?

A: The parts are electrically and mechanically identical. Differences exist in product lifecycle status (Obsolete vs. Not For New Designs), RoHS compliance (non-compliant vs. ROHS3 Compliant), and packaging format (unspecified vs. Tray). The C8051F320-GQ also carries verified programmability status.

Q: Are there any pin compatibility issues when switching between these parts?

A: No. Both parts use the 32-LQFP (7x7mm) package with identical pin assignments, voltage requirements (2.7V ~ 3.6V), and I/O configuration (25 pins).

Q: Which part should be selected for new production?

A: The C8051F320-GQ is the appropriate choice for new production due to improved compliance certifications (ROHS3, REACH Unaffected) and higher inventory availability. The C8051F320 is Obsolete and should not be used for new designs.

Q: Are firmware or software changes needed when substituting these parts?

A: No. Both parts implement the identical 8051 core architecture, instruction set, memory organization, and peripheral register mapping. Existing firmware requires no modification.

Q: What is the moisture sensitivity level for both parts?

A: Both C8051F320 and C8051F320-GQ carry MSL 3 rating with 168-hour floor life. Identical moisture handling and storage requirements apply.

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