CP2108-B02-GMR USB 2.0 to Quad-UART 64-QFN
MPN: CP2108-B02-GMR ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.7827 | $3.78 |
| 10 | $3.7827 | $37.83 |
| 100 | $3.7827 | $378.27 |
| 500 | $3.7827 | $1,891.35 |
| 1,000 | $3.7827 | $3,782.70 |
CP2108-B02-GMR Overview
A USB-to-UART bridge is an interface controller that connects a USB host to one or more asynchronous serial ports. In the broader electronics hierarchy, it belongs to interface ICs and USB interface controllers rather than a general-purpose microcontroller. The CP2108 family is particularly useful when a product needs multiple COM ports, legacy serial peripherals, service interfaces, or industrial equipment connectivity without allocating separate USB-to-serial adapters.
Verified distributor and manufacturer information identifies the device as supporting USB 2.0, low-speed or full-speed operation, four UART channels, and a 3.3 V operating supply. Its 64-QFN exposed-pad construction supports compact surface-mount layouts while providing a defined thermal and ground connection through the exposed pad. Tape-and-reel ordering is represented by the GMR suffix, and the supplied distributor listings identify the component as a 64-QFN USB bridge.
The CP2108 is appropriate for industrial control adapters, test equipment, multiport serial hubs, embedded systems, and legacy peripheral upgrades. Its quad-UART architecture can reduce the number of discrete interface components needed when several serial channels share one USB connection. Firmware and host-driver deployment should be checked against the manufacturer’s current software support before production release, especially where an existing product has an established USB device identity.
A key design consideration is that USB-to-UART conversion does not automatically make an RS-232 or RS-485 physical layer. The external transceiver, connector, protection network, and cable requirements remain application-specific. Layout should preserve short USB differential routing, provide the required supply and ground-plane integrity, and use the exposed-pad land pattern specified by the manufacturer.
This page consolidates verified manufacturer and distributor information, a cautious replacement assessment, and practical interface considerations that are not available from a raw distributor listing. Exact pin-level details, electrical limits, lifecycle status, and pricing beyond the supplied listing should be confirmed against the current CP2108 datasheet and distributor records.
Drop-in alternatives for CP2108-B02-GMR — 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 CP2108-B02-GMR (same form factor and footprint) — differing in Package, Flow Control, Internal Oscillator, Operating Temperature, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
CP2108-B01-GMR
✅ Drop-In✓ In Stock
$4.35 / Unit
View Datasheet →CP2108-B02-GM
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →CP2108-B03-GMR
✅ Drop-In✓ In Stock
$4.61 / Unit
View Datasheet →CP2108-B03-GM
✅ Drop-In✓ In Stock
$3.7973 / Unit
View Datasheet →CP2108-B02-GMR Specifications
| Product Type | Single-chip USB-to-Quad-UART bridge controller |
| USB Interface | USB 2.0 |
| USB Speed | Low-speed/full-speed |
| UART Channel Count | 4 channels |
| Supply Voltage | 3.3 V |
| Package | 64-pin QFN exposed-pad package |
| Package Dimensions | 9 mm x 9 mm |
| Interface Function | USB-to-UART |
| Legacy Interface Target | RS-232 and RS-485 designs |
| Mounting Type | Surface mount |
| Ordering Package | Tape and reel |
| Manufacturer | Silicon Labs |
| ECCN | EAR99 |
| MSL Level | 3 (168 hours) |
| HTSUS Code | 8542.39.0001 |
| Lifecycle Status | Obsolete, according to supplied distributor listing |
CP2108-B02-GMR tape and reel Pin Configuration Guide
Pin configuration for CP2108-B02-GMR (tape and reel package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for CP2108-B02-GMR.
Refer to the datasheet for full pin configuration.
Typical Applications
CP2108-B02-GMR is suitable for 6 applications: Industrial serial-to-USB adapter, Legacy RS-232 equipment upgrade, RS-485 multi-drop data acquisition, Embedded test and measurement controller, Multiport service and configuration interface, Compact industrial gateway.
Industrial serial-to-USB adapter
The CP2108-B02-GMR fits an industrial serial-to-USB adapter when one USB connection must expose multiple UART channels. Its four-UART architecture can consolidate several legacy serial ports into one USB interface, while the 3.3 V supply and 64-QFN exposed-pad package support compact controller hardware. The application still requires external RS-232 or RS-485 transceivers, connectors, surge protection, and any required galvanic isolation. Firmware must enumerate the bridge correctly, and the USB descriptor, COM-port behavior, and operating-system driver expectations should be validated before field deployment. The manufacturer datasheet is the controlling source for electrical limits and timing.
Recommended
Legacy RS-232 equipment upgrade
The CP2108-B02-GMR can modernize equipment that previously relied on isolated or multi-port RS-232 connectivity. Four UART channels provide a bridge resource for several serial links, but the IC does not itself provide RS-232 voltage levels, so each channel requires the appropriate line-driver and receiver. The 9 mm by 9 mm QFN exposed-pad package helps reduce board area, although the exposed pad and thermal-via layout must follow the manufacturer drawing. A migration project should verify connector pinouts, cable compatibility, baud-rate settings, and host software before replacing the original interface circuitry.
Recommended
RS-485 multi-drop data acquisition
The CP2108-B02-GMR is suitable as the USB-side controller for multi-drop data-acquisition equipment that needs multiple UART channels feeding external RS-485 transceivers. The bridge concentrates the USB connection, while transceiver selection determines fail-safe biasing, termination, isolation, and surge protection. The 3.3 V supply requirement must be reconciled with the transceiver interface levels. Firmware should define each port independently and handle bus timing, direction control, and fault recovery. Because the supplied data does not specify maximum baud rate or transceiver pin mapping, those details must be confirmed in the CP2108 datasheet and selected transceiver documentation.
Recommended
Embedded test and measurement controller
The CP2108-B02-GMR can provide a compact USB control path for test and measurement equipment with several UART-based instrument or fixture connections. Four UART channels allow a controller board to bridge one USB port to multiple peripheral devices, reducing the need for separate USB adapters. The design must account for instrument ground references, trigger timing, electrical protection, and the possibility that one channel is dedicated to boot or service communication. The 64-QFN exposed-pad package supports compact assembly, but thermal-via and ground-return layout should follow the official package drawing. Validate host drivers and application software during prototype testing.
Recommended
Multiport service and configuration interface
The CP2108-B02-GMR is useful in products that need a USB service port plus separate UART links for configuration, logging, or peripheral control. Its quad-UART architecture gives firmware a single USB device identity while exposing multiple logical serial channels. The bridge does not determine the service protocol, so the product must define descriptors, baud-rate handling, timeout behavior, and command security in firmware. External protection may be needed if service connectors are user-accessible. Because CP2108-B02-GMR is listed as obsolete in the supplied distributor data, production use should be conditioned on lifecycle confirmation or an approved Silicon Labs continuity path.
Recommended
Compact industrial gateway
The CP2108-B02-GMR can serve as the serial-interface element in a compact industrial gateway that connects USB to legacy equipment. Four UART channels provide room for multiple downstream devices or redundant service paths, while the QFN package supports dense board designs. The gateway still needs external transceivers, surge protection, isolation, and power regulation appropriate to the field environment. Firmware should map each UART channel to a defined application function and handle disconnected or shorted lines predictably. The supplied lifecycle information marks the part obsolete, so new gateway designs should compare current Silicon Labs or other validated bridge options rather than assume long-term availability.
Recommended
Recommended Products Summary
Engineering reference data for CP2108-B02-GMR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CP2108-B01-GMR | CP2108-B02-GM | CP2108-B03-GMR | CP2108-B03-GM |
|---|---|---|---|---|---|
| Product Function | USB-to-Quad-UART bridge | Related CP2108 USB-to-UART variant | USB-to-UART, 3.3 V, 64-pin QFN EP | Related CP2108 USB-to-UART variant | USB 2.0, 3.3 V, 64-pin QFN EP |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Package | 64-QFN exposed-pad package | 64-QFN package | 64-QFN exposed-pad package | 64-QFN exposed-pad package | 64-QFN exposed-pad package |
| USB Interface | USB 2.0 | USB | USB | USB | USB 2.0 |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Packaging Form | Tape and reel | Tape and reel | Tape and reel | Tape and reel | Tray |
Key Differentiators
- Quad-UART integration (vs CP2112-F03-GMR)
- Single-chip multiport USB bridge (vs CP2108-B01-GMR)
- USB 2.0 and 3.3 V integration (vs CP2108-B03-GM)
Design Notes
Route the USB differential pair as a short, tightly coupled pair with a continuous ground reference. Place the USB connector and protection network according to the manufacturer’s reference layout, and keep switching or high-current circuitry away from the USB and exposed-pad ground path. The supplied data confirms a 9 mm by 9 mm 64-QFN exposed-pad package but does not provide exact land-pattern dimensions, so use the official package drawing rather than a generic QFN footprint.
Treat the exposed pad as both a ground connection and a thermal path. Implement the manufacturer-recommended thermal-via pattern and connect the pad to the ground plane with low-impedance vias. Because the supplied data does not provide power dissipation, maximum supply current, or junction-temperature limits, no thermal estimate is made here. Validate the assembled board with the actual USB traffic, external transceiver load, ambient temperature, and enclosure conditions.
Do not assume that the CP2108 includes RS-232 or RS-485 line drivers. Add the correct external transceivers, protection, and termination for the target physical layer. Also confirm USB descriptors, host-driver expectations, UART channel mapping, and legacy connector pin assignments before releasing a replacement design. The bridge converts USB and UART signaling; it does not preserve application protocol behavior automatically.
Provide a clean 3.3 V supply with local decoupling placed according to the manufacturer’s recommended layout. Coordinate the bridge supply with the voltage requirements of the external UART transceivers, because a 3.3 V bridge does not determine the logic voltage of every attached serial interface. Verify supply sequencing, current margin, cable surge exposure, and protection-device current ratings before finalizing the power architecture.
Lifecycle risk is material for this MPN because the supplied distributor listing marks CP2108-B02-GMR obsolete. Before a new production release, obtain current availability from Silicon Labs or an authorized distributor and evaluate any approved continuity or replacement program. The supplied cross-reference material does not establish five quantified, fully verified drop-in replacements, so lifecycle and firmware compatibility must be reviewed separately from package matching.
Compliance Information
The supplied FindIC comparison identifies CP2108-B02-GM as RoHS compliant. The supplied data does not establish REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status for this exact MPN.
