C8051F800-GU Equivalent & Substitute Parts

Part Overview

The C8051F800-GU is an 8-bit microcontroller from Silicon Labs' C8051F80x series, featuring a 25MHz 8051 core processor with 16KB FLASH program memory and 512 bytes of RAM. The device integrates SMBus, SPI, and UART connectivity with peripheral functions including capacitive sensing, power-on reset, PWM, temperature sensor, and watchdog timer capabilities in a 24-QSOP surface mount package.

This part is classified as obsolete. Identifying equivalent and substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity when original inventory becomes unavailable.

Substiute Parts

C8051F800-GU

Silicon LabsIn Stock: 1182C8051F800-GU Datasheet

Current PartRFQ

EFM8BB31F16G-D-QSOP24

Silicon LabsIn Stock: 1085EFM8BB31F16G-D-QSOP24 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the C8051F800-GU is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• 8051-compatible core processor architecture
• 16KB FLASH program memory minimum
• 24-QSOP package footprint
• Surface mount technology
• Operating temperature range of -40°C to 85°C
• Supply voltage compatibility within or overlapping the 1.8V to 3.6V range

Acceptable Variation Parameters:

• Core processor variant (8051 or CIP-51 8051 compatible)
• RAM size (may exceed 512 x 8)
• Clock speed (may exceed 25MHz)
• Number of I/O pins (may exceed 17)
• Data converter specifications (may be enhanced)
• Peripheral feature set (may be expanded)

The EFM8BB31F16G-D-QSOP24 meets all mandatory criteria while offering enhanced specifications in clock speed, RAM capacity, and data conversion capabilities.

Parameter Comparison

Engineering Selection Recommendations

The EFM8BB31F16G-D-QSOP24 is a direct substitute for the C8051F800-GU based on the following engineering factors:

Compatibility Basis: Both devices share identical 24-QSOP package geometry, 8051-compatible core architecture, 16KB FLASH memory, and identical operating temperature range. The substitute maintains full pinout compatibility for the specified package type.

Product Status Advantage: The EFM8BB31F16G-D-QSOP24 is classified as active product status, ensuring continued availability, manufacturing support, and technical documentation. The C8051F800-GU's obsolete status creates long-term supply risk.

Compliance Alignment: Both parts maintain RoHS compliance. The substitute achieves ROHS3 compliance, meeting current environmental and regulatory standards.

Performance Enhancement: The substitute provides doubled clock speed (50MHz vs. 25MHz), expanded RAM (2.25K vs. 512 bytes), and enhanced data conversion capabilities (12-bit DAC addition). These enhancements are backward-compatible with legacy firmware designed for the original part.

Voltage Supply Consideration: The substitute's minimum supply voltage is 2.2V compared to the original 1.8V. Applications requiring operation below 2.2V require voltage level verification before substitution.

Frequently Asked Questions (FAQ)

Q: Can the EFM8BB31F16G-D-QSOP24 directly replace the C8051F800-GU in existing PCB designs?

A: Yes. Both devices use identical 24-QSOP package geometry and pinout. No PCB layout modifications are required. Firmware compatibility depends on application-specific code; the substitute's enhanced specifications are generally backward-compatible.

Q: What is the primary reason for substitution?

A: The C8051F800-GU is obsolete. The EFM8BB31F16G-D-QSOP24 is an active product from the same manufacturer, ensuring long-term availability and support.

Q: Are there voltage supply differences that affect substitution?

A: Yes. The original part operates from 1.8V minimum; the substitute requires 2.2V minimum. Verify your application's supply voltage range. If operation below 2.2V is required, the substitute is not suitable.

Q: Does the substitute offer performance improvements?

A: Yes. The EFM8BB31F16G-D-QSOP24 provides 50MHz clock speed (vs. 25MHz), 2.25K RAM (vs. 512 bytes), and includes a 2-channel 12-bit DAC. These enhancements do not create compatibility issues with legacy firmware.

Q: Are both parts RoHS compliant?

A: Yes. The C8051F800-GU is RoHS compliant. The EFM8BB31F16G-D-QSOP24 is ROHS3 compliant, meeting current environmental standards.

Q: What connectivity differences exist between the parts?

A: Both support SMBus, SPI, and UART/USART. The substitute adds explicit I2C support. No connectivity loss occurs during substitution.