C8051F340-GQ - 8-Bit 48 MHz USB MCU | Silicon Labs
MPN: C8051F340-GQ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.799 | $1.80 |
| 10 | $1.799 | $17.99 |
| 100 | $1.799 | $179.90 |
| 500 | $1.799 | $899.50 |
| 1,000 | $1.799 | $1,799.00 |
C8051F340-GQ Overview
A microcontroller is a programmable integrated circuit containing a CPU core, memory, peripherals, and input/output interfaces. The C8051F34x belongs to the 8051 microcontroller family and combines digital control with mixed-signal measurement functions. Its 8-bit data bus supports embedded control, while the high-speed C8051F34x core executes firmware for protocol handling, data acquisition, and device control.
Key features include a 10-bit, 20-channel ADC operating to 200 ksps, a voltage reference, two comparators, an internal temperature sensor, a watchdog timer, an internal oscillator, a power-on reset, a VDD monitor, and an integrated voltage regulator. The USB 2.0 function controller supports direct USB-connected products, while 5 V-tolerant port I/O and RST inputs support mixed-voltage external interfaces.
The device combines an 8051-compatible control core with integrated analog peripherals, reducing external component count in USB instrumentation, data acquisition, human-interface, and embedded control systems. Its 64 KB Flash memory provides room for application firmware and USB code, while 4.25 KB RAM supports working data and stack operations. The integrated analog block enables sensor reading, threshold detection, and control functions without a separate ADC.
Typical applications include USB-connected test equipment, measurement instruments, data-acquisition modules, industrial control products, and embedded USB peripherals. The 48 MHz clock specification is listed by DigiKey, while Mouser describes the part as a 50 MHz 8-bit MCU; engineers should verify the exact operating conditions and clock configuration in the manufacturer datasheet before design release.
The principal design consideration is package and power planning. This exact orderable suffix uses the 48-pin TQFP footprint, and the manufacturer documents other C8051F34x devices in 32-pin LQFP or QFN packages. USB routing, analog-reference grounding, decoupling, and crystal or clock selection must be planned according to the manufacturer’s recommended layout and USB application requirements.
This page combines the verified manufacturer feature summary, package information, distributor listings, and cross-reference evidence into a practical component-selection record. It also distinguishes verified drop-in evidence from family variants and highlights where a replacement requires pinout, firmware, memory, and peripheral verification before approval.
Drop-in alternatives for C8051F340-GQ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
C8051F341-GQ
✅ Drop-In📋 Reference alternative (not in catalog)
C8051F340-GQR
✅ Drop-In📋 Reference alternative (not in catalog)
C8051F340-DK
✅ Drop-In📋 Reference alternative (not in catalog)
C8051F340-GQ Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit mixed-signal microcontroller |
| Processor Core | C8051F34x 8051 core |
| Maximum Clock | 48 MHz |
| Data Bus Width | 8 bit |
| Flash Program Memory | 64 KB |
| RAM | 4.25 KB |
| Supply Voltage | 2.7 V to 5.25 V |
| ADC Resolution | 10 bit |
| ADC Input Channels | 20 channels |
| ADC Sampling Rate | 200 ksps |
| USB Interface | USB 2.0 function controller |
| USB Integration | Integrated transceiver and on-chip clock recovery |
| Comparators | 2 |
| Temperature Sensor | Integrated |
| Internal Oscillator | Plus or minus 1.5 percent internal oscillator |
| I/O Port Count | 21 I/O ports |
| Input Voltage Tolerance | Up to 5 V on Port I/O and RST pins |
| Package | 48-pin TQFP, 7 x 7 mm |
| Mounting Type | Surface mount |
C8051F340-GQ 48-pin tqfp, 7 x 7 mm Pin Configuration Guide
Pin configuration for C8051F340-GQ (48-pin tqfp, 7 x 7 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 C8051F340-GQ.
Refer to the datasheet for full pin configuration.
Typical Applications
C8051F340-GQ is suitable for 6 applications: USB Connected Test and Measurement, USB Data-Acquisition Module, Embedded USB Control Product, Industrial Sensor Interface, Human-Interface and Configuration Device, Low-Power USB Peripheral.
USB Connected Test and Measurement
The C8051F340-GQ fits USB-connected instrumentation because its USB 2.0 function controller, integrated transceiver, and on-chip clock recovery reduce the USB interface component count. Its 48 MHz C8051F34x core can coordinate data transfer, device control, and status reporting, while 64 KB Flash provides storage for application firmware. The 10-bit, 20-channel ADC rated to 200 ksps can acquire instrumentation signals when paired with suitable input conditioning. The design trade-off is that USB bandwidth, measurement accuracy, and trigger timing depend on firmware and the analog front end, not on the MCU rating alone.
Recommended
USB Data-Acquisition Module
The C8051F340-GQ is suitable for a compact data-acquisition module because it combines an 8-bit 48 MHz core with a 10-bit, 20-channel, 200 ksps ADC. Firmware can scan or sequence analog inputs, apply calibration, and transfer results over USB without a separate MCU and ADC package. Its 4.25 KB RAM supports buffering, although sustained data rates depend on processing time, USB transfer scheduling, and channel multiplexing. A mixed-signal layout should keep analog inputs, reference circuitry, digital clocks, and USB routing separated according to the manufacturer recommendations.
Recommended
Embedded USB Control Product
For embedded USB control products, the C8051F340-GQ provides a single-chip combination of MCU, USB 2.0 connectivity, Flash, RAM, and analog peripherals. The integrated USB transceiver and clock recovery can simplify the board compared with a design using an external USB controller, while the 8051-compatible core supports compact embedded firmware. A designer should verify the exact USB enumeration, power, suspend, resume, and bus-routing requirements from the manufacturer documentation. The 48-pin TQFP also provides more routing flexibility than a smaller package but requires careful escape routing around the fine-pitch leads.
Recommended
Industrial Sensor Interface
The C8051F340-GQ can serve as the controller for an industrial sensor interface when sensing, thresholding, and USB reporting must be combined in one device. Its 10-bit ADC, two comparators, internal temperature sensor, and 4.25 KB RAM allow the MCU to process sensor conditions before communicating results. The integrated analog reference and multiplexer can simplify channel selection, but the usable accuracy and noise performance still depend on reference stability, sampling strategy, input filtering, and grounding. Industrial temperature and EMC requirements must be checked separately because those ratings are not established in the supplied data.
Recommended
Human-Interface and Configuration Device
The C8051F340-GQ can implement a USB human-interface or configuration device with a small external control interface. The 21 I/O ports and 5 V-tolerant Port I/O and RST inputs provide connections for buttons, indicators, logic signals, and external control lines. USB firmware can enumerate the product and exchange configuration data while the C8051F34x core handles device state and peripheral control. Engineers must confirm the exact pin assignments and electrical limits from the datasheet because the supplied search results confirm the I/O tolerance but do not provide a complete pin table.
Recommended
Low-Power USB Peripheral
The C8051F340-GQ can support a low-power USB peripheral when firmware uses the device's integrated USB and mixed-signal resources to minimize external components. The internal oscillator, regulator, power-on reset, watchdog timer, and USB clock recovery can reduce the number of support parts compared with a discrete design. Actual low-power performance depends on the selected clock, USB suspend behavior, analog-channel activity, firmware execution state, and supply architecture; those operating currents are not included in the verified data. Prototype current measurements should therefore establish the final battery and regulator design.
Recommended
Recommended Products Summary
Engineering reference data for C8051F340-GQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | C8051F341-GQ | C8051F340-GQR | C8051F340-DK |
|---|---|---|---|---|
| Package | 48-pin TQFP, 7 x 7 mm | 48-pin TQFP | 48-pin TQFP | 48-pin TQFP |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Processor Core | C8051F34x 8051 core | C8051F34x family | C8051F340 family | C8051F340 family |
Key Differentiators
- Integrated USB connectivity (vs C8051F341-GQ)
- Integrated mixed-signal acquisition (vs C8051F340-GQR)
- Single-chip USB support (vs General-purpose 8-bit MCU)
Design Notes
Validate the USB and MCU supply rails against the exact electrical limits in the Silicon Labs datasheet, because the supplied sources report both 2.7 V to 5.25 V and 2.7 V to 3.6 V. Place local decoupling close to the supply pins and keep analog-reference and digital-supply return paths controlled. Do not infer 5 V tolerance on every power pin; the verified 5 V statement applies specifically to Port I/O and RST inputs.
Plan the 48-pin TQFP layout around differential USB routing, controlled impedance, short return paths, and clean separation from sensitive analog inputs. The verified sources confirm the 48-pin TQFP package but do not provide the complete pin table, so use the manufacturer package drawing and pin-assignment data before routing. Keep the analog reference, ADC inputs, and digital clocks away from switching nodes and high-current return paths.
Treat the USB connection as a controlled-impedance interface rather than an ordinary digital peripheral. Follow the current Silicon Labs USB hardware guidance for trace geometry, protection, connector placement, grounding, and firmware-controlled transceiver behavior. The integrated transceiver and clock recovery reduce external parts, but they do not remove the need for careful board-level signal integrity and EMC design.
Do not substitute C8051F341-GQ, C8051F340-GQR, or another family member solely because the package appears similar. Confirm pin names, USB behavior, Flash and RAM capacity, analog peripherals, reset behavior, supply limits, package dimensions, and firmware/toolchain compatibility. The supplied comparison results identify these as related candidates but do not establish universal drop-in equivalence.
Compliance Information
RoHS compliance is reported by a supplied third-party specification result. The supplied data does not establish REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
