C8051F304R - 25MHz Mixed-Signal 8051 MCU | Silicon Labs (Tape & Reel)
MPN： C8051F304R ✓ 啟用中C8051F304R 概覽
A mixed-signal microcontroller is an embedded semiconductor that combines a digital microcontroller core with analog and timing peripherals. Within the product hierarchy, the C8051F304R belongs to the 8051 mixed-signal MCU family, combining a general-purpose microcontroller with an analog-to-digital converter, comparators, timers, and communication interfaces. This integration allows designers to place sensing, control, and digital processing functions on a single IC.
The device operates at 25 MHz and is advertised as delivering 25 MIPS. Its 4 kB Flash memory supports 4K x 8 programmable storage, while its 0.25 kB RAM provides 256 bytes of data memory. The integrated analog subsystem includes an 8-bit ADC capable of 500 ksps, eight external inputs, a comparator, and a built-in temperature sensor. Programmable amplifier gains and selectable references add flexibility for low-level signal acquisition.
Three 16-bit timers provide timing, capture, and event-management resources, while the additional communication interfaces expand the range of connected peripherals that can be supported. The 8051 architecture and Silicon Labs peripheral structure make the C8051F304R appropriate for compact control systems that need more analog measurement capability than a basic general-purpose MCU provides.
Typical uses include industrial sensor nodes, building-control modules, compact motor-control interfaces, temperature-measurement instruments, and low-power monitoring systems. The 11-pin QFN package is particularly useful where PCB area is constrained. In these designs, the ADC and comparator can perform fast local measurements while the timers support precise periodic control and the digital core handles protocol processing and system logic.
Designers should verify the exact package pin assignment, exposed-pad requirements, clock source, and analog-reference arrangement against the manufacturer datasheet before layout. Decoupling should be placed directly beside the supply pins, analog and digital returns should be routed deliberately, and exposed-pad thermal management may be necessary in designs with sustained computational or conversion activity.
This product page combines verified manufacturer and distributor information with application guidance, package constraints, and a conservative alternative analysis. It is intended to help engineers determine whether the C8051F304R provides the required Flash, RAM, ADC, timer, package, and supply capabilities without relying on generic microcontroller specifications.
直接替換替代品，適用於 C8051F304R — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： C8051F304R （相同外形與佔位） — 差異在於 Product Type, Package, Processor Core, Communication Interfaces, Flash Memory.
C8051F304-GM
✅ 直接替換📋 參考替代品（不在目錄中）
C8051F300
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
C8051F301
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →C8051F304R 最大額定值與電氣特性
| Product Type | Mixed-signal 8-bit microcontroller (MCU) |
| Processor Core | 8051 |
| 最大時脈頻率 | 25 MHz |
| Instruction Throughput | 25 MIPS |
| Flash Memory | 4 kB (4K x 8) |
| RAM | 0.25 kB (256 bytes) |
| ADC Resolution | 8 bit |
| ADC Maximum Sampling Rate | 500 ksps |
| ADC External Inputs | 8 inputs |
| Comparator | 1 comparator with programmable hysteresis and response time |
| Built-in Temperature Sensor | Yes |
| Timers | 3 x 16-bit timers |
| Programmable Amplifier Gains | Supported; gain and reference details require datasheet verification |
| Reference Voltage Options | External VREF pin or VDD |
| External Conversion Start Input | Yes |
| 封裝 | 11-pin QFN, 3 x 3 mm |
| 安裝類型 | Surface mount |
| Communication Interfaces | Additional communication interfaces; exact peripheral set requires datasheet verification |
C8051F304R 11-pin qfn, 3 x 3 mm 腳位配置指南
C8051F304R（11-pin qfn, 3 x 3 mm 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： C8051F304R.
請參閱 資料表 以查看完整腳位配置。
典型應用
C8051F304R 適用於 6 應用s: Industrial Sensor Node, Building Control Module, Temperature Monitoring Instrument, Compact Motor-Control Interface, Battery-Powered Monitoring Device, Programmable Threshold Controller.
Industrial Sensor Node
The C8051F304R fits compact industrial sensing nodes because its 25 MHz core performs local control while the 8-bit ADC samples up to eight external inputs at 500 ksps. The 256-byte RAM supports short acquisition and processing buffers, while 4 kB of Flash accommodates a focused control program. Place the device near the sensors to minimize analog trace length, use a stable external or VDD reference as permitted by the design, and isolate analog routing from switching nodes. The 3 x 3 mm QFN saves board area, although thermal verification remains necessary under sustained conversion and processing loads.
推薦
Building Control Module
The C8051F304R is suitable for building-control modules that monitor environmental inputs and coordinate actuator timing. Its eight-input 8-bit ADC can support multiple analog sensing channels, while three 16-bit timers provide the timing base needed for periodic sampling, debounce handling, and motor or valve-control sequences. The 25 MHz execution rate provides useful response margin without requiring a larger processor. Use careful partitioning between analog and digital grounds, place bypass capacitance beside the supply pins, and confirm the comparator threshold and hysteresis settings against the manufacturer datasheet.
推薦
Temperature Monitoring Instrument
The C8051F304R provides the core functions for a compact temperature-monitoring instrument because it combines an 8-bit ADC, a comparator, and a built-in temperature sensor. The ADC can evaluate up to eight external inputs at 500 ksps, enabling fast sampling of probes or auxiliary sensor channels, while the 25 MHz core supports calibration, filtering, display updates, and alarm logic. Its 256-byte RAM limits buffering depth, so streamed measurements should be processed promptly. Component selection, gain, and reference configuration must be checked in the datasheet before defining the measurement accuracy budget.
推薦
Compact Motor-Control Interface
The C8051F304R can serve as the low-level controller in a compact motor-control or actuator interface by combining three 16-bit timers with fast analog conversion. Timers provide the timing resources needed for pulse generation, input capture, and periodic control, while the 500 ksps ADC can monitor current, position, or analog command signals. The 25 MHz core leaves processing headroom for closed-loop logic. Keep switching-node and motor-current traces away from the QFN and analog traces, validate the exposed-pad thermal path, and account for the limited 256-byte RAM when sizing buffers and diagnostic data.
推薦
Battery-Powered Monitoring Device
The C8051F304R is suitable for a small battery-powered monitoring device that periodically acquires analog data and then performs local control or communications. Its 4 kB Flash supports a compact firmware image, and the three 16-bit timers can organize wake intervals, sampling periods, and communication windows. The built-in temperature sensor provides an additional local measurement source. Actual standby-current behavior was not included in the verified data, so battery-life calculations require the manufacturer electrical specifications. Firmware should disable unused peripherals and use low-power modes only after confirming wake-up timing and peripheral behavior.
推薦
Programmable Threshold Controller
The C8051F304R works well in programmable threshold and alarm systems because its comparator supports adjustable hysteresis and response time while the ADC provides a measurement path for more detailed diagnosis. Designers can use the comparator for rapid digital threshold events and the 500 ksps ADC for slower, calibrated measurements, with the 25 MHz core coordinating state transitions and outputs. The 11-pin QFN minimizes board area in embedded control cards. Verify input-voltage limits and routing requirements, maintain clean references, and test threshold behavior across temperature because the supplied data does not quantify comparator offsets.
推薦
工程參考資料，適用於 C8051F304R — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | C8051F304R-GM | C8051F300 | C8051F301 | C8051F302 | C8051F303 |
|---|---|---|---|---|---|---|
| Package | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Processor Core | 8051 | 8051 | 8051 | 8051 | 8051 | 8051 |
主要差異化特點
- Compact mixed-signal integration (對比C8051F300)
- Explicit 11-pin 3 x 3 mm QFN configuration (對比C8051F304R-GS)
- High-speed 8-bit conversion with eight inputs (對比C8051F303)
- Three dedicated 16-bit timing resources (對比C8051F302)
設計說明
Treat the 11-pin QFN as a compact RF-sensitive layout. Place input and output bypass capacitors immediately beside their corresponding supply pins, keep the ADC traces short, and route analog inputs away from timer outputs, clock lines, and switching-power nodes. The verified material identifies an external VREF option, so provide a clean reference source if selected. Do not assign exact pin locations without checking the applicable QFN drawing because the supplied excerpts do not include the complete pin table.
Validate the thermal path rather than assuming the small 3 x 3 mm QFN is adequate without copper. The exposed-pad arrangement and maximum dissipation were not included in the verified excerpts, so calculate worst-case self-heating from the actual supply, output, and ADC activity, then apply the manufacturer junction-temperature limits. Use maximum PCB copper permitted by the assembly process and consider a reduced operating rate if continuous conversion or sustained CPU activity causes the calculated junction temperature to approach its limit.
Do not select the C8051F304R solely because its nominal speed, Flash, and RAM meet the headline requirements. The 256-byte RAM materially limits buffering, the 8-bit ADC constrains resolution, and the exact QFN pinout, exposed pad, clock options, supply range, and analog-reference limits must be checked in the family datasheet. When using a same-family alternative, confirm that every physical pin and firmware-visible peripheral remains available; a smaller member may reduce Flash, RAM, timers, or communication resources.
Plan analog and digital return paths deliberately. If the ADC, comparator, or temperature sensor is used, keep their inputs on the quiet side of the board and minimize shared copper that carries switching current. Provide local decoupling at the QFN supply pins and use the exposed pad according to the manufacturer's land-pattern and solder-reflow guidance. Because the verified data does not state whether the pad is electrically tied to a supply or ground, that connection must be confirmed before release to manufacturing.
合規資訊
The supplied verified snippets do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because the C8051F304R is an industrial mixed-signal microcontroller and no automotive qualification was identified.
