What is a cross-reference page for C8051F126R?
This page groups mapped replacement options for C8051F126R so buyers and engineers can compare alternatives before requesting a quote or approving a substitute.
Alternative part analysis
C8051F126R replacements, alternatives, and cross reference
Compare mapped replacement and alternative options for C8051F126R, then verify package, specifications, and application fit before approval.
Compare C8051F126R against mapped replacement options
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Specification view
Parameter Comparison Chart
A side-by-side view of the source part and its mapped alternatives so buyers and engineers can screen package, availability, lifecycle, and key descriptors before RFQ.
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| Parameter Comparison Chart | Current part C8051F126R Silicon Labs |
|---|---|
| Part Number | C8051F126R |
| Manufacturer | Silicon Labs |
| Category | Integrated Circuits (ICs) |
| Subcategory | Embedded - Microcontrollers |
| Package | TQFP |
| Series | C8051F12x |
| Key Attributes | - |
| Description | IC MCU 8BIT 128KB FLASH 100TQFP |
| Lifecycle | - |
| Stock | 20,578 |
| Available | 77,178 |
| Min Order | 1 |
| Datasheet | Available |
| Height Seated (Max) | 1.2mm |
| Lead Free | Contains Lead |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Part Status | Obsolete |
| Published | 2000 |
| Categories | Integrated Circuits (ICs) |
| Frequency | 50MHz |
| Terminal Form | GULL WING |
| Technology | CMOS |
| Qualification Status | Not Qualified |
| Terminal Position | QUAD |
| Terminal Pitch | 0.5mm |
| Operating Temperature | -40°C~85°C TA |
| Supply Voltage | 3V |
| Sub-Categories | Embedded - Microcontrollers |
| ECCN | 3A991A2 |
| HTS Code | 8542.31.00.01 |
| Package / Case | 100-TQFP |
| Surface Mount | YES |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Reflow Temperature-Max (s) | NOT SPECIFIED |
| Address Bus Width | 16 |
| Number of Pins | 100 |
| Pin Count | 100 |
| Number of Terminations | 100 |
| Length | 14mm |
| Manufacturer | Silicon Labs |
| Number of I/O | 64 |
| Interface | 2-Wire, EBI/EMI, I2C, SMBus, SPI, UART, USART |
| Series | C8051F12x |
| Base Part Number | C8051F12 |
| Manufacturer's Part No. | C8051F126R |
| Oscillator Type | Internal |
| Core Size | 8-Bit |
| uPs/uCs/Peripheral ICs Type | MICROCONTROLLER |
| Program Memory Size | 128KB 128K x 8 |
| Memory Size | 128kB |
| Bit Size | 8 |
| Program Memory Type | FLASH |
| DMA Channels | NO |
| Data Bus Width | 8b |
| Has ADC | YES |
| PWM Channels | YES |
| DAC Channels | YES |
| Supply Voltage-Min (Vsup) | 2.7V |
| Access Time | 50 μs |
| Number of Channels | 6 |
| Voltage - Supply (Vcc/Vdd) | 2.7V~3.6V |
| Core Processor | 8051 |
| Peripherals | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT |
| Connectivity | EBI/EMI, SMBus (2-Wire/I2C), SPI, UART/USART |
| RAM Size | 8.25K x 8 |
| Data Converter | A/D 8x8b, 8x10b; D/A 2x12b |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
| HTSUS | 8542.31.0001 |
| ECCN Code | 3A001.A.3 |
| Actions |
Cross-reference FAQ
Replacement Part Questions
Short answers for teams reviewing C8051F126R replacement and equivalent-part options.
Does a mapped alternative mean a guaranteed drop-in replacement for C8051F126R?
Not automatically. Cross-reference mapping helps shortlist candidates, but package, electrical behavior, qualification scope, and approval rules still need to be checked before release.
Which parameters should teams compare first for C8051F126R alternatives?
Start with package, series, key attributes, lifecycle status, stock position, datasheet access, and the mapped pin-to-pin or cross-reference note. Then confirm application-specific requirements in the datasheet and RFQ stage.
Can I request a quote for an alternative to C8051F126R?
Yes. Use the product links or RFQ actions on this page to request pricing, availability, documentation, and sourcing support for any listed alternative part.
Is C8051F126R obsolete, and what replacement should buyers review first?
Check the lifecycle row on this page first. If buyers need a fast starting point, the strongest mapped replacement currently surfaced here is , followed by the other alternatives shown in the comparison table.
Engineering support
Need help validating the replacement path?
If your team is unsure whether a mapped alternative to C8051F126R from Silicon Labs is really usable, contact us for help on package fit, pin compatibility, key parameter gaps, and qualification-facing review questions.
Contact a hardware engineer
Email our engineering support contact at [email protected], or use the contact page if the question should be routed across sourcing, engineering, and support.
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Package and pin compatibility
Review whether the alternate path looks credible from package, footprint, and pin-level perspectives.
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Parameter and function gaps
Surface the electrical, interface, or application-fit questions that still need confirmation before approval.
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Qualification and approval prep
Organize the documentation, datasheet evidence, and validation checkpoints your internal team may still require.