C8051F123 Equivalent & Substitute Parts

Part Overview

The C8051F123 is an 8-bit microcontroller from Silicon Labs' C8051F12x series, featuring a 100MHz 8051 core with 128KB FLASH program memory and 8.25KB RAM. This device integrates multiple communication interfaces (SPI, UART, I2C/SMBus, EBI/EMI) and analog capabilities including 8-channel 8/10-bit ADCs and 2-channel 12-bit DACs, housed in a 64-TQFP surface-mount package.

The C8051F123 is classified as Obsolete, making equivalent or substitute parts necessary for ongoing production, maintenance, and new design considerations. Direct substitutes with identical electrical and mechanical specifications are available to maintain design compatibility while addressing product lifecycle constraints.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Speed	100MHz
Program Memory Size	128KB (128K x 8) FLASH
RAM Size	8.25K x 8
Number of I/O	32
Voltage Supply (Vcc/Vdd)	3V ~ 3.6V
Data Converters	A/D 8x8b, 8x10b; D/A 2x12b
Connectivity	EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
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 C8051F123 is determined by strict equivalence across electrical and mechanical parameters. The primary substitute, C8051F123-GQ, maintains identical specifications across all critical dimensions:

Substitution Criteria (Mandatory Match):

Core processor architecture (8051)
Core size (8-Bit)
Operating frequency (100MHz)
Program memory capacity and type (128KB FLASH)
RAM capacity (8.25K x 8)
I/O count (32 pins)
Supply voltage range (3V ~ 3.6V)
Data converter configuration (A/D 8x8b, 8x10b; D/A 2x12b)
Connectivity interfaces (EBI/EMI, SMBus, SPI, UART/USART)
Peripheral feature set (Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT)
Operating temperature range (-40°C ~ 85°C)
Package type and dimensions (64-TQFP 10x10)
Moisture sensitivity level (MSL 3)

The C8051F123-GQ differs only in packaging format (Tray vs. standard packaging), product status classification, and compliance certifications, with no impact on functional or electrical equivalence.

Parameter Comparison

Parameter	C8051F123	C8051F123-GQ
Manufacturer	Silicon Labs	Silicon Labs
Series	C8051F12x	C8051F12x
Core Processor	8051	8051
Core Size	8-Bit	8-Bit
Speed	100MHz	100MHz
Program Memory Size	128KB (128K x 8) FLASH	128KB (128K x 8) FLASH
RAM Size	8.25K x 8	8.25K x 8
Number of I/O	32	32
Voltage - Supply (Vcc/Vdd)	3V ~ 3.6V	3V ~ 3.6V
Data Converters	A/D 8x8b, 8x10b; D/A 2x12b	A/D 8x8b, 8x10b; D/A 2x12b
Connectivity	EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART	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
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)
RoHS Status	RoHS non-compliant	ROHS3 Compliant
REACH Status	Not specified	REACH Unaffected

Engineering Selection Recommendations

C8051F123-GQ as Direct Substitute:

The C8051F123-GQ provides complete electrical and mechanical equivalence to the C8051F123. Selection of C8051F123-GQ is appropriate for applications requiring:

Identical functional performance and pin compatibility
ROHS3 compliance (vs. RoHS non-compliant original)
REACH regulatory compliance
Tray packaging format for automated assembly processes
Verified programmability status

Both devices share identical core specifications, memory architecture, peripheral integration, and thermal operating range. The C8051F123-GQ represents the current production equivalent with enhanced regulatory compliance posture.

Frequently Asked Questions (FAQ)

Q: Are C8051F123 and C8051F123-GQ pin-compatible?

A: Yes. Both devices use the 64-TQFP (10x10) package with identical pin assignments, electrical characteristics, and functional specifications. Direct PCB-level substitution is supported without design modification.

Q: What is the difference between C8051F123 and C8051F123-GQ?

A: The devices are electrically and functionally identical. Differences are limited to packaging format (Tray for -GQ variant), product lifecycle status, and compliance certifications. C8051F123-GQ is ROHS3 compliant and REACH unaffected, while the original C8051F123 is RoHS non-compliant.

Q: Can C8051F123-GQ be used in new designs?

A: C8051F123-GQ is classified as "Not For New Designs" per product status. For new development, consult Silicon Labs for current-generation 8051-based microcontroller alternatives within the C8051F12x series or successor product lines.

Q: Are there firmware or software compatibility issues between these parts?

A: No. Identical core processor architecture, memory configuration, and peripheral integration ensure complete software compatibility. Existing firmware requires no modification.

Q: What is the MSL rating and handling requirement?

A: Both devices carry MSL 3 (168 Hours) moisture sensitivity level. Standard ESD and moisture control procedures apply during storage and assembly operations.

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