C8051F311 - 25MHz Mixed-Signal MCU with 16KB Flash | Silicon Labs
MPN: C8051F311 ✓ ActiveC8051F311 Overview
An 8-bit microcontroller is a programmable semiconductor that integrates a processor core, memory, and peripherals on one mixed-signal system-on-chip. The C8051F311 belongs to the 8051-compatible microcontroller family and combines digital control with on-chip analog conversion and comparison functions. Its 25 MHz core supports up to 25 MIPS, while 16 kB of Flash stores firmware and 1.25 kB of RAM supports working data.
The principal features are a 10-bit ADC with 17 channels and 200 ksps conversion capability, two on-chip comparators, and four 16-bit timers. The manufacturer product page also identifies on-chip power-on reset and additional communication interfaces. These resources reduce the need for external converters, timers, and interface circuitry in moderately complex embedded systems while keeping the board area compact.
Technically, the device integrates a high-speed pipelined 8051-compatible core with mixed-signal peripherals in a 5 mm by 5 mm QFN28 package. The ADC can use an external reference or the device supply according to the verified manufacturer description. Because this is an MCU rather than a power semiconductor, SOA data is not applicable, and thermal design focuses on package power dissipation, copper area, and ambient temperature rather than a Safe Operating Area graph.
Typical uses include industrial sensor acquisition, building-control modules, compact instrumentation, digital control panels, and low-cost embedded control products. A firmware-driven ADC task can sample up to 17 channels, while the timers and comparators support thresholding, periodic measurement, motor-related timing, or local alarm functions. The 16 kB Flash limit and 1.25 kB RAM should be checked against the final firmware and buffering requirements.
Designers should preserve clean analog grounding, place decoupling capacitors close to the supply pins, and route analog inputs away from fast digital signals. Because the verified material provides only a QFN28 package description and no complete verified pin table, the package outline can be identified without assigning unsupported signal names to individual pins. Firmware should also account for reset behavior and analog-reference accuracy.
This product record combines the verified manufacturer specifications, distributor availability information, package details, and procurement data with an explicit review of drop-in alternatives. It also identifies where pin assignments, environmental limits, and comparative peripheral data require confirmation in the manufacturer datasheet before a new design is released.
Drop-in alternatives for C8051F311 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with C8051F311 (same form factor and footprint) — differing in ADC Resolution, Package, Flash Memory, ADC Input Configuration, Core Architecture.
C8051F310-GM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
C8051F312-GM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
C8051F313-GM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
C8051F317-GM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
C8051F321
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →C8051F311 Maximum Ratings & Electrical Characteristics
| Product Type | Mixed-signal 8-bit microcontroller |
| CPU Core | 8051-compatible |
| Maximum Clock Frequency | 25 MHz |
| Maximum CPU Performance | 25 MIPS |
| Flash Memory | 16 kB |
| RAM | 1.25 kB |
| ADC Resolution | 10 bit |
| ADC Input Channels | 17 channels |
| ADC Sampling Rate | 200 ksps |
| Comparator Count | 2 |
| Timer Count | 4 x 16-bit |
| Power-On Reset | On-chip |
| Package | QFN-28, 5 mm x 5 mm |
| Mounting Type | Surface mount |
| RoHS Status | unknown |
| REACH Status | unknown |
C8051F311 qfn-28, 5 mm x 5 mm Pin Configuration Guide
Pin configuration for C8051F311 (qfn-28, 5 mm x 5 mm package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for C8051F311.
Refer to the datasheet for full pin configuration.
Typical Applications
C8051F311 is suitable for 6 applications: Industrial Sensor Acquisition, Building Control and HVAC, Compact Digital Control Panel, Portable Instrumentation Module, Threshold Monitoring and Alarm System, Embedded Data Acquisition Node.
Industrial Sensor Acquisition
The C8051F311 fits compact sensor-acquisition modules because its 10-bit ADC provides 17 channels at up to 200 ksps while the four 16-bit timers support periodic sampling and timeout handling. The MCU can scan analog inputs, apply calibration in its 16 kB Flash program area, and use the 1.25 kB RAM for temporary sample data. Two on-chip comparators can provide threshold alarms without an external comparator. The tradeoff is limited RAM and program space, so designs should avoid large local buffers and prefer streamed or scaled data.
Recommended
Building Control and HVAC
The C8051F311 is suitable for distributed building-control nodes that monitor several analog sensors and drive simple alarms or actuators. Its 17-channel ADC reduces the need for external multiplexers, while the 200 ksps conversion capability supports responsive sampling beyond typical thermal or occupancy-sensor requirements. The 25 MHz core can coordinate communication interfaces, timers, and comparator thresholds in firmware. Because the verified material does not specify the exact communication protocols or automotive qualification, the chosen C8051F311 suffix must be checked against the deployment environment.
Recommended
Compact Digital Control Panel
A compact control panel can use the C8051F311 for local keypad or menu processing, analog adjustment inputs, timing functions, and communication with a remote controller. The 8051-compatible core operates at up to 25 MIPS, giving firmware capacity for user-interface state machines and communications in a device measuring only 5 mm by 5 mm. Its four 16-bit timers are useful for debouncing, periodic updates, and motor or relay timing, although the 1.25 kB RAM requires disciplined buffer sizing.
Recommended
Portable Instrumentation Module
The C8051F311 can serve as the processing engine in a portable measurement module where a low-power footprint and mixed-signal integration are important. The 10-bit ADC supports up to 17 sampled inputs, while 16 kB Flash holds configuration tables, calibration constants, and measurement routines. Its small QFN28 package permits a dense PCB, and the 200 ksps ADC rate can support fast sampling when the selected input source and bandwidth permit it. Battery life and analog accuracy must be evaluated with the complete operating-voltage and power-consumption data from the manufacturer datasheet.
Recommended
Threshold Monitoring and Alarm System
The two integrated comparators make the C8051F311 appropriate for threshold monitoring, where sensed voltage or current is compared against a reference and an event triggers firmware action. The 25 MHz core can handle event logging, debounce timing, and communication, while the four 16-bit timers support long intervals or precise measurement windows. Compared with a discrete comparator and separate microcontroller arrangement, the integrated implementation can reduce board area. Designers must still validate input common-mode range, reference accuracy, and response timing against the datasheet.
Recommended
Embedded Data Acquisition Node
The C8051F311 is well suited to a small data-acquisition node that periodically samples up to 17 analog channels and forwards processed values over an available communication interface. Its 200 ksps ADC provides ample rate for many slow industrial signals, while 16 kB Flash stores acquisition firmware and 1.25 kB RAM supports a rolling sample buffer. The 5 mm by 5 mm QFN28 package helps minimize board size. Firmware should avoid blocking conversions and use timer-driven sampling so communication and measurement tasks remain responsive.
Recommended
Recommended Products Summary
Engineering reference data for C8051F311 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | C8051F310-GM | C8051F312-GM | C8051F313-GM | C8051F317-GM | C8051F321 |
|---|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
Key Differentiators
- Integrated 17-channel mixed-signal conversion (vs C8051F321)
- Compact 28-pin implementation (vs C8051F317-GM)
- Deterministic timing resources (vs C8051F313-GM)
Design Notes
Place all required bypass capacitors close to the corresponding C8051F311 supply pins and provide a low-impedance ground reference. The verified material confirms a compact QFN28 implementation but does not provide exact capacitance values, so component selection must follow the manufacturer datasheet rather than generic assumptions. Keep analog inputs short, provide a quiet analog return path, and reserve the exposed pad connection and land pattern according to the official package drawing.
Route analog inputs away from the 25 MHz core clock and other fast digital nets, and treat analog ground references as a carefully planned return-current problem. If ADC precision matters, keep external sensor networks close to the MCU, minimize trace resistance, and place any required RC filtering close to the relevant input. The verified 10-bit, 17-channel, 200 ksps ADC specification establishes converter capability, but application accuracy also depends on reference stability, source impedance, and layout.
Do not substitute a related C8051F31x device based only on family name or package appearance. Check the exact suffix, pin names, power pins, analog pins, exposed-pad requirements, clock configuration, memory size, and peripheral assignments against the manufacturer datasheet. The alternatives in this record are same-brand family candidates sourced from llm_knowledge because the supplied web results did not provide verified comparative specifications; each requires engineering confirmation before use.
Compliance Information
The verified search results do not explicitly provide RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification statements for C8051F311. Obtain current compliance documentation from Silicon Labs before production release.
