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BCM8156FBIFB - 11.35 Gbps Ethernet Transceiver IC | Broadcom
The Broadcom BCM8156FBIFB is a high-speed Ethernet transceiver IC designed by Broadcom Limited (formerly Avago Technologies) for demanding backplane and line-card applications requiring high bandwidth and low latency. The device delivers multi-rate serial data transmission up to 11.35 Gbps, supports Ethernet protocol operation, and is housed in a surface-mount package suitable for dense PCB layouts found in networking switches, routers, and high-speed serial interconnect links. A transceiver (Tx/Rx) is an interface IC that converts parallel digital data into a serial differential signal for transmission over copper backplanes, cables, or optical modules, and performs the reverse conversion on the receive side. Transceivers sit within the broader category hierarchy of interface ICs -> wired communication ICs -> Ethernet transceivers -> serial transceivers -> semiconductor devices. They are foundational building blocks in the PHY (physical layer) of the OSI model, where they implement PCS, PMA and PMD sublayers per IEEE 802.3 standards, working with MAC controllers and clock-and-data recovery circuits. Key features include multi-rate operation up to 11.35 Gbps, integrated serializer/deserializer (SerDes) functionality, adaptive equalization for lossy channels, and low-latency data path design. The BCM8156 family targets backplane and chip-to-chip interconnect applications where signal integrity at multi-gigabit rates is critical. The BCM8156FBIFB integrates high-speed analog front ends with digital logic to handle pre-emphasis, receive equalization, and clock data recovery on each lane. Its adaptive equalization engine compensates for frequency-dependent loss in FR-4 backplanes and improves eye opening at the receiver. Typical applications include 10G/40G Ethernet switches, optical transport network (OTN) equipment, high-speed router line cards, data center fabric interconnects, and backplane serializer/deserializer links. When designing with this device, ensure proper PCB layout for high-speed serial channels, including controlled-impedance differential routing (typically 100 ohm differential), continuous reference planes, and AC-coupling capacitors on each lane. The FBIFB designator indicates a specific package/reel variant.
BCM84851B1KFSBG - 10GBASE-T PHY Transceiver | Broadcom
The Broadcom BCM84851B1KFSBG is a single-port 10GBASE-T PHY transceiver built on a 28 nm CMOS process, designed for high-density Ethernet networking equipment. It integrates a complete physical-layer transceiver for 10GBASE-T (IEEE 802.3an), 1000BASE-T, and 100BASE-TX over Category 6A/7 twisted-pair copper cabling, and connects to a host MAC through 10G SGMII+, USXGMII, or XFI interfaces. The device is offered in a compact HLQFN surface-mount package suitable for switch, router, and server line-card layouts. A 10GBASE-T PHY (Physical Layer transceiver) is a mixed-signal IC that sits between a host MAC (Media Access Controller) and the RJ45/MDI connector, performing analog front-end, adaptive DSP-based echo/next/cross-talk cancellation, PAM-16 modulation, and forward-error correction. PHYs belong to the Ethernet transceiver family, which in turn falls under interface ICs and the broader category of wired networking semiconductors. They are essential building blocks for any equipment that converts digital MAC frames into line-side analog signals over copper media. Key capabilities of the BCM84851B1KFSBG include operation over 100 m of Cat 6A at full 10 Gb/s with sub-1 W typical port power, support for Energy Efficient Ethernet (EEE) per IEEE 802.3az with sub-100 mW idle power, and integrated 1588v2 / 802.1AS precision time-stamping with hardware time-stamping at the PHY. The device also implements Auto-Negotiation ( Clause 73 for 10G and Clause 28 for legacy rates), KR backplane training support, and a low-latency cut-through path optimized for HPC and financial trading workloads. It is typically paired with a base-T magnetics module and a 25 MHz reference clock on the line card. The architecture combines a low-jitter PLL-based clock tree, an ADC front-end capable of handling the ~800 MHz Nyquist bandwidth required for 10 Gb/s PAM-16, and an iterative DSP engine implementing Tomlinson-Harashima precoding (THP) on the transmit side and decision-directed equalization (DDE) plus LDPC FEC on the receive side. Power consumption is managed through per-lane activity monitoring and a built-in thermal sensor, with the device supporting both 1.0 V and 1.8 V supply rails. The 28 nm node keeps dynamic power low while maintaining the analog noise margin required for 100 m reach. Typical applications include top-of-rack data-center switches, 10G server adapters and LOM (LAN-on-motherboard) designs, enterprise aggregation routers, telecom backhaul, and industrial networking platforms that require deterministic latency. Its small footprint also suits high-port-count 48- and 64-port switches where per-port power and board area are critical. When designing with the BCM84851B1KFSBG, careful attention must be paid to MDI signal integrity: route the four differential pairs as 100 m matched-impedance traces with no more than two vias, place the magnetics within 25 mm of the RJ45 connector, and isolate the analog supplies with ferrite beads. JTAG boundary-scan and Broadcom's CableEyeTool / SDK provide link-quality diagnostics that simplify EMC pre-compliance. This page consolidates distributor pricing, qualified Broadcom alternatives, and field-tested design notes not found in the standalone product brief, giving you the full engineering picture for a 10GBASE-T port decision.
BCM84894B0IFSBG - Quad-Port Multi-Rate Ethernet PHY | Broadcom
The Broadcom BCM84894B0IFSBG is a quad-port, multi-rate Ethernet PHY transceiver supporting 10GBASE-KR/CR, 25GBASE-KR/CR, and 100GBASE-KR4/CR4 operation in a compact FBGA package. It integrates four independent SerDes lanes with auto-negotiation across the 10G/25G/100G Ethernet family, enabling flexible backplane and direct-attach copper (DAC) topologies for hyperscale data center switching fabrics. The device is part of Broadcom's BCM8489x series of high-density physical-layer devices targeting top-of-rack (ToR), leaf, and spine switch line cards. An Ethernet PHY (physical layer transceiver) is the analog/digital interface between the MAC layer of a switch or NIC and the copper or optical cable medium. Multi-rate PHYs unify multiple line rates on a single port to simplify board layout, reduce BOM cost, and support heterogeneous speeds across modern data center fabrics. The BCM84894 sits in the taxonomy: Ethernet PHY -> transceiver -> interface IC -> integrated circuit -> semiconductor. Key features include integrated KR/CR backplane equalization with adaptive DFE/FFE, IEEE 802.3bj/bm/bs/an compliance, low-latency PCS/PMA architecture, and per-port diagnostic eye-monitor capability. The FBGA package integrates the PHY with PMD sublayers, supporting both gearbox and gearbox-less MAC attachments through a flexible SERDES interface. Each port independently negotiates between 10G, 25G, and 100G, allowing mixed-speed backplanes without firmware rework. The architecture uses a DSP-based receiver with continuous-time linear equalizer (CTLE), decision-feedback equalizer (DFE), and feed-forward equalizer (FFE) to compensate for channel loss up to 30+ dB at Nyquist. On the line side, a low-jitter PLL and voltage-mode driver maintain IEEE 802.3-compliant transmit signal integrity across long backplanes and DAC cables up to 5 meters. Typical applications include 100G/25G ToR data center switches, hyperscale leaf-spine fabrics, high-performance network interface cards (NICs), and Ethernet-based storage front-ends. The quad-port density also makes it well-suited for QSFP28-based modular line cards requiring four lanes per cage. When designing with this PHY, verify MAC-side SerDes rate compatibility and PCB channel loss budget against the 802.3bj KR/CR specification. Adequate thermal relief is essential: a quad-port device driving 100G per port can dissipate several watts, requiring thermal vias under the FBGA and airflow management in the chassis. This page synthesizes distributor pricing, drop-in alternative availability, and application context drawn from Broadcom marketing materials - engineering guidance not found in the manufacturer datasheet alone.
BCM84898B0KFSBG - Octal 10G/5G/2.5G/1G PHY | Broadcom | Networking
The Broadcom BCM84898B0KFSBG is an octal-port 10GBASE-T/5GBASE-T/2.5GBASE-T/1000BASE-T/100BASE-TX Ethernet PHY transceiver housed in a 19 mm x 19 mm BGA package. Designed for high-density data-center top-of-rack (ToR) switches, it integrates eight independent physical-layer transceivers on a single die, each capable of auto-negotiating between 10G, 5G, 2.5G, 1G, and 100M Ethernet over CAT6A cabling. In modern data-center and enterprise networking, an Ethernet PHY (Physical Layer transceiver) is the analog front-end that converts between the digital MAC domain's parallel data and the serial differential signaling transmitted over copper twisted-pair cable. The PHY handles line coding, echo cancellation, cross-talk suppression, and link training, enabling the MAC to operate against a transparent physical link. NBASE-T PHYs such as the BCM84898 family were developed to extend the useful life of installed Cat5e/Cat6A structured cabling by supporting 2.5G and 5G rates over the same copper plant used for 1G. The BCM84898B0KFSBG features EEE (Energy-Efficient Ethernet) support per IEEE 802.3az, KR-style backplane interoperability, and integrated MACsec-ready interfaces. Its DSP-based architecture supports full-duplex operation on all eight ports simultaneously, with per-port independent auto-negotiation and link training. The 19x19 BGA package is a thermally-enhanced flip-chip BGA designed for high-density switch ASIC co-design with heat-sink attach and a controlled-impedance BGA ball pattern. Production complexity is managed by Broadcom's reference platform design with synchronized controller ASICs. This device is primarily used by Tier-1 OEMs in 1U8Gblade-switch designs, top-of-rack 48-port 10G switches, and high-density enterprise access-layer switches. It is also found in hyperscale data center fabric switches and 25G/50G hybrid ToR designs where multi-speed PHY ports are required to bridge legacy 1G servers with newer 10G/25G endpoints. When designing with this part, ensure adequate PCB breakout routing for the BGA's high-density ball array, provide a low-noise multi-rail power architecture (typically 0.9V/1.0V/1.8V/2.5V), and pair it with a compatible switch ASIC that exposes the standard QSGMII/USGMII/XFI host interface. Thermal management via heat-sink attach is mandatory under full 8-port 10G load conditions.
BCM8727MCIFBG - Dual 10GbE SFI-to-XAUI PHY | Broadcom
The Broadcom BCM8727MCIFBG is a dual-channel 10-Gigabit Ethernet SFI-to-XAUI PHY transceiver housed in a 324-pin BGA package, supporting 10.31 Gbps per channel for high-density networking line cards. According to Broadcom product documentation, the device performs serialization, clock-data recovery (CDR), and physical-layer adaptation between the Serdes Framer Interface (SFI) and the XAUI (10-Gigabit Attachment Unit Interface), enabling 10GBASE-R optical module connectivity to MAC-side ASICs and switches. A SFI-to-XAUI PHY is a specialized physical-layer transceiver IC that bridges a high-speed serial optical interface (SFI, typically routed to an XFP or SFP+ optical module) and the XAUI 4-lane 3.125 Gbps parallel interface used by 10GbE MACs. In the broader taxonomy, it belongs to the Ethernet PHY family within interface ICs, sitting below the MAC layer and above the optical module. These PHYs are essential building blocks in switches, routers, and NICs that aggregate 10GbE ports at line-card scale. Key features include dual-channel integration (two independent 10GbE PHYs in a single IC), SFI receive and transmit paths with integrated CDR, XAUI-side 4-lane transmit and receive, support for IEEE 802.3ae 10GBASE-R encoding/decoding, and MDIO/I2C management interfaces for status monitoring and link diagnostics. The 324-pin BGA package is engineered for high-density switch/router PCB layouts where signal-integrity-controlled via arrays are required for 10+ Gbps routing. Technically, the BCM8727MCIFBG integrates two complete SFI-XAUI PHY channels, sharing reference clock distribution, JTAG, and management interfaces to minimize board area. Each channel supports independent reset, loopback, and squelch control, enabling per-port diagnostics. The BGA substrate provides controlled-impedance routing for differential SFI and XAUI lanes, critical for meeting IEEE 802.3ae jitter and eye-mask requirements at 10.3125 Gbps. Typical applications include 10GbE line cards in enterprise and carrier-grade switches, SFP+/XFP optical port aggregation in routers, 10GBASE-LR/SR fiber-optic NICs and host-bus adapters, and high-density data-center top-of-rack switching fabrics. When designing with this device, allocate dedicated GND and power planes under the BGA, follow Broadcom reference layout for SFI/XAUI differential pairs, and decouple each supply pin with 0.1uF ceramic plus bulk polymer capacitors to meet IEEE 802.3ae jitter tolerance. This page synthesizes distributor stock, pin-compatible alternatives, and Broadcom application notes not aggregated on individual distributor listings.
BCM88360A0IFSBLG - Traffic Manager PktProc | Broadcom
The Broadcom BCM88360A0IFSBLG is a high-performance telecom interface IC classified as a Traffic Manager Packet Processor, designed for networking and switching equipment operating over industrial temperature ranges. Housed in a large 388-ball BGA package supplied in tray packaging, this device belongs to Broadcom's StrataDNX/BCM88360 family of carrier-grade packet processors commonly deployed in high-port-density Ethernet switches, MPLS routers, and carrier aggregation platforms. A telecom interface IC is a specialized integrated circuit that performs physical-interface, framing, and traffic-management functions within telecommunications equipment. In the hierarchy of networking semiconductors, this category sits below full network processors and above PHY transceivers, acting as the co-processor responsible for traffic shaping, queue management, and packet classification. Broadcom's BCM88360 family targets deep-buffer aggregation and switching at 10G, 40G, and 100G line rates, requiring the high-BGA-count package for the wide parallel datapath and multiple SerDes lanes. Key features include industrial temperature grade operation, a 388-ball BGA surface-mount form factor, and integration with Broadcom's HiGig/FastPath switch architectures. The IC supports wire-speed packet processing for buffer management, congestion management, hierarchical QoS, and traffic policing commonly required in carrier Ethernet and data-center aggregation switches. The package's 388 balls provide the dense I/O necessary for multiple external memory interfaces, fabric ports, and control/status buses. Typical applications include enterprise and carrier Ethernet aggregation switches, MPLS and IP edge routers, data-center top-of-rack or spine switches, and packet transport platforms requiring deep buffering. The BCM88360A0IFSBLG is qualified for industrial-grade thermal operation, making it suitable for outdoor cabinet deployments and uncontrolled-airflow environments. When designing with this device, follow Broadcom reference design guidelines for PCB layout, including controlled-impedance SerDes traces, solid power and ground planes, and thermal vias under the BGA. Design verification requires use of Broadcom's SDK and reference firmware to validate the switch-fabric and packet-processing pipelines.
CD4051BE - 8:1 Analog Multiplexer, 240 Ohm, 16-PDIP | Texas Instruments
The Texas Instruments CD4051BE is a CMOS single 8-channel analog multiplexer or demultiplexer with logic-level conversion, housed in a 16-pin PDIP (N) package. The device features a typical on-state resistance of 125 Ohm at VDD-VEE = 15V, supports signal input ranges over 15 Vp-p at VDD-VEE = 18V, and operates across a wide supply range from 3 V to 20 V single supply or ±10V dual supply. A CMOS analog multiplexer is an analog switch that selects one of N analog input channels and routes it to a single common output line, under control of digital select inputs. Multiplexers belong to the broader category of analog switches and multiplexers, which in turn sit within interface ICs and signal-conditioning components. The CD405xB family from Texas Instruments (originally designed by RCA) provides low-leakage, low-crosstalk switching for precision analog and audio signal paths, with logic-level translation between 3 V digital control and ±10 V analog rails. Key features of the CD4051BE include matched switch characteristics with RON = 5 Ohm typical delta between channels at VDD-VEE = 15V, channel OFF leakage of ±100 pA typical at VDD-VEE = 18V, and very low quiescent power dissipation under all digital control input conditions. The device also offers low ON resistance of 125 Ohm typical, high OFF resistance, and logic-level translation enabling digital control from 3V CMOS logic while switching ±10V analog signals. The 16-pin PDIP through-hole package provides easy insertion into legacy breadboards and through-hole PCB designs. The CD4051BE uses a CMOS architecture with break-before-make switching action, preventing momentary shorting between adjacent channels during channel transitions. The three binary select inputs (A, B, C) along with an active-low inhibit input provide 8 -to-1 multiplexing, while the bidirectional common pin (COM) allows the same device to operate as a 1-to-8 demultiplexer by reversing the role of input and output. This architecture is well suited to low-frequency precision analog signal routing where switch capacitance and leakage, not bandwidth, dominate the error budget. Typical applications include analog signal routing in data acquisition systems, audio signal multiplexing in mixing consoles, sensor signal multiplexing in industrial instrumentation, automatic test equipment channel selection, and telecommunications line selection. The wide supply range allows direct interfacing to both 5V legacy analog systems and modern 3.3V digital controllers without level shifters. When designing with this device, ensure that VEE is connected to ground or negative supply for unipolar operation, and provide adequate decoupling close to VDD and VEE pins. The inhibit pin (INH) should be tied to ground when not used, and select inputs (A, B, C) should not float - tie them to VDD or VSS through a defined logic level to prevent shoot-through current. This page synthesizes distributor pricing, drop-in alternatives in the same 16-PDIP footprint, application-specific guidance for audio and sensor multiplexing, and design considerations not found in the manufacturer datasheet alone.
CH340C - USB to UART Bridge IC, SOP-16 | WCH (Qinheng Micro)
The WCH (Nanjing Qinheng Microelectronics) CH340C is a USB-to-UART bridge controller IC that provides a full-speed USB 2.0 device interface on the USB side and a standard asynchronous serial (UART) interface on the device side, simulating a traditional serial port so that legacy RS-232 applications can be migrated to USB without firmware changes. The 'C' variant integrates the 12 MHz clock generation on-chip, so unlike the CH340G it requires no external crystal or oscillator, simplifying PCB layout and reducing BOM cost for hobbyist and consumer designs. It is offered in a 16-pin SOP-16 package and supports both 3.3 V and 5 V supply operation, making it compatible with 5 V-tolerant microcontroller UARTs and modern 3.3 V MCUs from the same board. Built-in features include full MODEM control signals (RTS, DTR, DCD, RI, DSR, CTS), automatic handshake and flow control, and a hardware full-speed USB 2.0 transceiver. The CH340C is widely deployed as the USB-to-serial converter on Arduino Uno/Nano clones, ESP8266/ESP32 programmer boards, and low-cost serial debug adapters where it replaces more expensive FTDI or Silicon Labs bridges. A USB-to-UART bridge (also called a USB-to-serial converter) is a type of interface IC that bridges a USB host (computer) to a UART peripheral (microcontroller, GPS module, legacy serial device). The hierarchy is: USB bridge > USB-to-UART bridge > serial interface IC > interface controller > integrated circuit. The bridge enumerates as a Virtual COM Port (VCP) on the host OS, so existing PC software treats the USB cable as a legacy COM port without code changes. Key features include on-chip 12 MHz oscillator (no crystal required), 3.3 V and 5 V operating modes selectable via the V3 pin, USB 2.0 full-speed (12 Mbps) compliance, integrated USB termination and pull-up resistors, and built-in power-on reset. Maximum baud rate is 2 Mbps per the WCH datasheet, covering most MCU debug and firmware-flashing workloads. The CH340C uses a CMOS process with an internal SIE (Serial Interface Engine), endpoint FIFO buffer, and UART block. Suspend current is rated at approximately 50 uA per the WCH data, and active supply current is typically 7 mA during full-speed USB traffic - well within bus-powered budgets. Typical applications include Arduino clone boards, ESP-01/NodeMCU programmers, USB-to-TTL debug cables, and industrial serial port expansion where the host PC has dropped native RS-232 ports. The 5 V tolerance also lets the bridge interface legacy 5 V MCUs directly. When designing with the CH340C, route the USB D+/D- pair as a 90-ohm differential pair with a common-mode choke, place the V3-decoupling capacitor close to the pin, and confirm host-OS driver availability - native Windows 10/11 and Linux/macOS support exists, but some legacy Windows installations require the WCH-supplied INF driver. This page synthesizes distributor pricing, verified pin-compatible drop-in variants (CH340B, CH340N, CH340E) in the same SOP footprint family, and practical PCB/design notes not collected in a single spot in the WCH datasheet.
CH340G - USB to UART Bridge IC, SOP-16, 2 Mbps | WCH
The WCH (Nanjing Qinheng Microelectronics) CH340G is a USB-to-UART bridge controller that converts between USB 2.0 full-speed signals and asynchronous serial UART, housed in a 16-pin SOP-16 (SOIC-16) package. It supports 5V and 3.3V supply operation, baud rates from 50 bps to 2 Mbps, and integrates an optional RS-232 assistant mode that inserts an internal inverter on the RXD pin when the R232 pin is driven high. An external 12 MHz crystal is required for the CH340G variant; the CH340C variant in the same family replaces the crystal with an internal oscillator. A USB-to-UART bridge (also called a USB-serial converter) is an interface controller that translates USB packets into asynchronous UART frames and vice versa, allowing microcontrollers that lack native USB (such as the ATmega328P, ESP8266, or older PIC parts) to communicate with a host PC through a standard COM port. USB-UART bridges sit one layer below the USB protocol stack and above the bare UART peripheral, transforming what would otherwise require a complex HID/CDC firmware stack into a transparent virtual COM port. CH340 fits into the broader taxonomy of interface ICs -> bus converters -> USB bridges. Key features of the CH340G include full USB 2.0 full-speed device compatibility, hardware flow control on CTS/RTS, automatic transmitter/receiver buffer management, modem signals (RI, DCD, DTR, DSR), and 5V-tolerant IO when VCC is 5V. The device enumerates as a CDC-class device on Windows/macOS (driver required on Windows) and as a CDC-ACM device on Linux/Android without additional drivers. The SOP-16 footprint is the most widely used package for hobbyist Arduino Nano and NodeMCU/ESP-12E boards. The CH340G uses an external 12 MHz fundamental-mode crystal feeding an internal PLL to derive the 48 MHz USB clock and the configurable UART baud-rate generator. Internal UART FIFOs buffer transmit and receive traffic, and the chip supports common baud rates from 50 bps up to 2 Mbps as well as non-standard rates generated through a divisor setting. The R232 assistant pin enables RS-232 polarity translation in software, eliminating the need for an external MAX232 in many point-to-point designs. Typical applications include Arduino Nano and Arduino Nano-compatible clones, ESP8266/ESP-12E serial programmer boards (NodeMCU, Wemos D1), industrial USB-to-RS232 adapters, USB-to-RS485 converter dongles, and as a low-cost debug serial bridge on custom MCU boards. It is also used in label printers, GPS receivers, and barcode scanners that need USB connectivity for legacy UART peripherals. When designing with the CH340G, ensure the 12 MHz crystal is placed within 5 mm of the XTI and XTO pins with a guard ground to avoid radiated emissions that can fail USB compliance. Decouple VCC with a 100 nF ceramic cap adjacent to pin 16 and a 4.7 uF bulk cap on the 3.3 V rail. The V3 pin should be left floating when using a 5 V supply or tied to a 3.3 V LDO when using a 3.3 V supply. This page synthesizes distributor pricing from LCSC, drop-in pin-compatible alternatives from the CH340 family, and practical design notes not consolidated in the manufacturer datasheet.
CH340N - USB 2.0 to UART Bridge IC, SOP-8 | WCH (Qinheng)
The WCH (Nanjing Qinheng Microelectronics) CH340N is a full-speed USB 2.0 to UART bridge IC housed in an 8-pin SOP-8 package, designed to convert between USB and standard serial (UART) interfaces. It supports 3.3 V and 5 V logic levels, operates over a -20 °C to +70 °C commercial temperature range, and provides serial baud rates up to 2 Mbps. The IC integrates the USB transceiver, oscillator, and UART logic, requiring only minimal external components to add a USB COM port to an embedded design. What is a USB-to-UART bridge? A USB-to-UART bridge IC is a class of interface controller that translates between the USB protocol used by a host PC and the asynchronous serial (UART) interface used by microcontrollers, GPS receivers, and legacy peripherals. These parts sit in the hierarchy: USB-to-UART bridge -> UART controller -> serial interface IC -> interface controller -> integrated circuit. The CH340 family from WCH is one of the most widely deployed low-cost bridges, found on virtually every Arduino-clone board and in countless debug-probe designs. Key features of the CH340N include hardware full-speed USB 2.0 device compliance, automatic USB enumeration without external firmware, support for common baud rates from 50 bps up to 2 Mbps, and built-in MODEM control signals. Its small SOP-8 footprint makes it ideal for space-constrained modules where the larger CH340G (SOP-16) does not fit. The chip needs only an external 12 MHz crystal and a few decoupling parts to provide a complete USB-to-serial solution on a board under 10 mm × 10 mm. Technically, the CH340N uses an internal 3.3 V LDO regulator that can also supply up to ~50 mA to external circuitry from the USB bus, simplifying designs that power a low-current MCU directly from the 5 V USB rail. The UART pins (TXD, RXD, RTS, CTS) are 5 V tolerant when VCC is 5 V, and operate at 3.3 V levels when VCC is 3.3 V. Driver support is included in mainstream Windows, macOS, and Linux kernels, although older Windows builds may need a vendor INF driver. Typical applications include Arduino-clone boards and hobbyist serial debuggers, industrial sensor data loggers, USB-to-RS232 adapter dongles (with an external level translator), USB programming interfaces for low-cost MCUs, point-of-sale terminals, and GPS module debug consoles. The wide 3.3 V / 5 V compatibility lets one design serve both 3.3 V MCUs (e.g., ESP32, RP2040) and 5 V boards (e.g., Arduino Uno) with no level shifting. When designing with the CH340N, place the 12 MHz crystal and load capacitors within 5 mm of the XI/XO pins, route D+/D- as a 90 Ω differential pair, and add a 1 µF bulk capacitor on VCC. For 5 V systems, tie V3 to VCC through a 4.7 kΩ resistor to enable the internal 3.3 V regulator; for 3.3 V systems, leave V3 floating. This page synthesizes distributor pricing, drop-in WCH-family alternatives, and practical design notes not found in the standalone WCH datasheet alone.
CI521 - Modbus TCP Interface Module | ABB | Industrial I/O
The ABB CI521 is a Modbus TCP interface module for the AC500 and S500 distributed I/O platforms, providing a communication bridge between an automation system and field devices. The verified ABB product information identifies CI521-MODTCP as a S500 interface module with a Modbus TCP server, 4 analog inputs, 2 analog outputs, 8 digital inputs, and 8 digital outputs. It is associated with the AC500/S500 system rather than being a standalone semiconductor component, so its package, pinout, electrical ratings, and pricing require additional manufacturer data before a PCB-level replacement can be considered. What is a Modbus TCP interface module? A Modbus TCP interface module is an industrial communication and I/O device that maps serial Modbus-style register data onto Ethernet-based automation equipment. In an AC500/S500 installation, it can distribute process measurements and control commands across a controller, remote I/O, sensors, actuators, and supervisory software. The verified CI521 description lists both analog and digital channels, with digital outputs rated at 24 VDC and 0.5 A, while the analog input and output signal types are identified as voltage, current, and RTD. The CI521-MODTCP configuration provides four analog inputs supporting U, I, and RTD, two analog outputs supporting U and I, eight 24 VDC digital inputs, and eight 24 VDC digital outputs. The product page also states that the system can be extended by up to 10 I/O modules. These are system-level capabilities rather than individual IC specifications, so replacement decisions must account for terminal-unit compatibility, network configuration, channel counts, signal conditioning, controller firmware, and the exact ABB product variant. Because CI521 is an industrial module, the relevant design concerns are network integration, terminal wiring, grounding, channel isolation, environmental limits, and controller configuration rather than semiconductor package pinout. The available search data does not provide verified dimensions, operating temperature, power consumption, Ethernet connector details, isolation ratings, or lifecycle status for the exact CI521 designation. The most reliable approach is to use the ABB CI521-MODTCP documentation and the original system configuration when selecting a replacement. Typical deployments include factory process-control cabinets, remote I/O stations, temperature and pressure monitoring, analog signal acquisition, digital actuator control, and Modbus TCP supervisory communication. A drop-in replacement must be validated against the AC500/S500 platform, terminal-unit arrangement, Modbus register map, channel ratings, and mechanical installation. Generic cross-reference results do not establish those conditions. This page distinguishes the verified CI521-MODTCP identity from unrelated search results for other CI521 references. It also records the provided source URLs, highlights missing technical fields instead of estimating them, and emphasizes that no pin-compatible alternatives were verified. For procurement, contact ABB or an authorized industrial distributor with the complete ordering code, firmware context, and cabinet configuration.
COM20022I3V-HT - 10Mbps 3.3V ARCNET Controller, 48-TQFP | Microchip
The Microchip Technology COM20022I3V-HT is a 3.3V, 10 Mbps ARCNET (ANSI 878.1) embedded network controller with 2Kx8 on-chip dual-port RAM, housed in a 48-pin TQFP (7x7 mm) package. It supports differential media interfaces (RS-485/Backplane variants), consumes 65 mA typical supply current from a 4.5 V to 5.5 V rail, and is rated for the extended industrial temperature range. An ARCNET (ANSI 878.1) controller is a deterministic, token-passing local-area-network protocol controller originally standardized by the ARCNET Trade Association and now widely deployed in industrial, factory, building-automation and transportation networks. Within the hierarchy: ARCNET controller -> network controller -> communication IC -> interface IC -> semiconductor. ARCNET sits alongside protocols such as Ethernet, CAN, and Profibus but is uniquely characterized by its deterministic token-passing media access which guarantees bounded latency - a property valued in real-time control systems where Ethernet's CSMA/CD unpredictability is unacceptable. Key features of the COM20022I3V-HT include automatic detection of multiplexed versus non-multiplexed microcontrollers/microprocessors, an 8-page message support with command chaining for packet queuing, minimal microcontroller and media-interface logic overhead, and flexible media interfaces (differential, RS-485, Backplane, fiber). The integrated 2Kx8 dual-port RAM allows zero-wait-state command chaining without external SRAM, simplifying board layout. The device is built on a mature CMOS process and integrates the entire ARCNET physical (PULSE/1) and data-link layer (token passing) in silicon. Designers connect it to a microcontroller via parallel bus (8-bit multiplexed or non-multiplexed) and to the physical media via a single external transceiver (e.g., a differential line driver). The HT suffix indicates high-temperature (-40C to +85C) operation. Typical applications include industrial/factory automation (PLC backbones, machine networking), building automation (HVAC, lighting control networks), transportation (rail signaling, traffic control), embedded control networks, and any deterministic real-time LAN requiring deterministic latency rather than Ethernet's best-effort behaviour. The 48-TQFP package is footprint-compatible with the broader COM20022I family. When designing with this part, place the external differential transceiver close to the COM20022I3V-HT to minimize stub length, use a 4.7 uF tantalum plus 0.1 uF ceramic bypass on VCC, and observe the recommended reset timing from the manufacturer datasheet. The HT (high-temperature) suffix makes this variant especially suited to outdoor cabinets and industrial enclosures without active cooling. This page synthesizes distributor pricing, same-package alternatives and design notes not found in the manufacturer datasheet.
CP2102-GM - USB-to-UART Bridge, QFN-28 | Silicon Laboratories
The Silicon Laboratories CP2102-GM is a highly integrated USB-to-UART Bridge Controller that provides a compact solution for migrating RS-232 designs to USB using a minimum of components and PCB area, packaged in a 5x5 mm 28-pin QFN (QFN-28) with exposed thermal pad. The device integrates a USB 2.0 full-speed function controller, USB transceiver, on-chip oscillator, internal EEPROM, and an asynchronous serial data bus (UART) with full modem control signals, eliminating the need for external USB components. A USB-to-UART bridge controller is a type of bridge IC that sits between a USB host and a legacy UART peripheral, translating USB protocol packets into asynchronous serial bytes and vice versa. In the broader taxonomy, the CP2102-GM belongs to interface ICs (USB bridge controllers), which are a sub-category of communication interface semiconductors that enable protocol translation between modern serial buses and legacy parallel/asynchronous interfaces used in microcontrollers, sensors, and embedded modems. Key features include a 3.0 V to 3.6 V single supply operation, integrated 3.3 V LDO voltage regulator, support for data rates from 300 baud up to 921.6 kbaud, and full modem control signals (RTS, CTS, DTR, DSR, DCD, RI). The internal 1024-byte EEPROM stores customizable product ID, vendor ID, serial number, and GPIO configuration, while royalty-free virtual COM port (VCP) drivers are provided for Windows, macOS, and Linux hosts. The device's architecture combines a USB 2.0 full-speed PHY, an 8051-compatible microcontroller core running the on-chip firmware, and a hardware UART block, with all clock generation handled internally. This integration removes the need for an external crystal, oscillator, or USB termination resistors, dramatically simplifying USB-enabling of legacy microcontroller designs where BOM count is critical. Typical applications include microcontroller-to-USB connectivity on evaluation boards and development kits, industrial point-of-sale terminals, USB dongles for legacy serial equipment, GPS module interfaces, and embedded debug/programming ports. The compact QFN-28 package suits space-constrained PCB layouts where a through-hole DB-9 connector would be impractical. When designing with the CP2102-GM, follow the bus-powered vs self-powered connection diagrams in the Silicon Labs datasheet, since the USB VBUS pin must be routed through a voltage divider when the device is self-powered. Suspend current can be as low as 100 uA, allowing the design to meet USB suspend-current requirements without additional power switching. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes that go beyond what is found in the manufacturer datasheet alone.
CP2102-GMR - USB-to-UART Bridge, QFN-28 | Silicon Laboratories (Tape & Reel)
The Silicon Laboratories CP2102-GMR is a highly integrated USB-to-UART Bridge Controller that provides a compact solution for migrating RS-232 designs to USB using a minimum of components and PCB area, packaged in a 5x5 mm 28-pin QFN (QFN-28) with exposed thermal pad. The device integrates a USB 2.0 full-speed function controller, USB transceiver, on-chip oscillator, internal EEPROM, and an asynchronous serial data bus (UART) with full modem control signals, eliminating the need for external USB components. A USB-to-UART bridge controller is a type of bridge IC that sits between a USB host and a legacy UART peripheral, translating USB protocol packets into asynchronous serial bytes and vice versa. In the broader taxonomy, the CP2102-GMR belongs to interface ICs (USB bridge controllers), which are a sub-category of communication interface semiconductors that enable protocol translation between modern serial buses and legacy parallel/asynchronous interfaces used in microcontrollers, sensors, and embedded modems. Key features include a 3.0 V to 3.6 V single supply operation, integrated 3.3 V LDO voltage regulator, support for data rates from 300 baud up to 921.6 kbaud, and full modem control signals (RTS, CTS, DTR, DSR, DCD, RI). The internal 1024-byte EEPROM stores customizable product ID, vendor ID, serial number, and GPIO configuration, while royalty-free virtual COM port (VCP) drivers are provided for Windows, macOS, and Linux hosts. The device's architecture combines a USB 2.0 full-speed PHY, an 8051-compatible microcontroller core running the on-chip firmware, and a hardware UART block, with all clock generation handled internally. This integration removes the need for an external crystal, oscillator, or USB termination resistors, dramatically simplifying USB-enabling of legacy microcontroller designs where BOM count is critical. Typical applications include microcontroller-to-USB connectivity on evaluation boards and development kits, industrial point-of-sale terminals, USB dongles for legacy serial equipment, GPS module interfaces, and embedded debug/programming ports. The compact QFN-28 package suits space-constrained PCB layouts where a through-hole DB-9 connector would be impractical. When designing with the CP2102-GMR, follow the bus-powered vs self-powered connection diagrams in the Silicon Labs datasheet, since the USB VBUS pin must be routed through a voltage divider when the device is self-powered. Suspend current can be as low as 100 uA, allowing the design to meet USB suspend-current requirements without additional power switching. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes that go beyond what is found in the manufacturer datasheet alone.
CP2102N-A01-GQFN28 - USB to UART Bridge QFN-28 | Silicon Labs (Tape & Reel)
The Silicon Labs CP2102N-A01-GQFN28 is a USB-to-UART bridge controller from the USBXpress family, providing a single-chip solution for adding USB 2.0 full-speed connectivity to UART peripherals. The device integrates a USB 2.0 full-speed function controller, USB transceiver, on-chip oscillator, and an internal 3.3V LDO regulator in a 28-pin QFN (5x5 mm) package with USB 2.0 UART interface support. A USB-to-UART bridge is a class of protocol converter IC that translates USB signaling into asynchronous serial (UART) signaling, allowing legacy RS-232/RS-485 devices, microcontroller debug ports, and sensor nodes to communicate with a host PC over the USB bus without writing USB firmware. Bridges like the CP2102N live in the hierarchy: USB bridge IC -> interface IC -> connectivity IC -> mixed-signal semiconductor. They are a faster, lower-risk alternative to embedding a USB stack in firmware, and they typically enumerate as a Virtual COM Port (VCP) so existing serial-terminal software works unmodified. The CP2102N-A01 delivers USB 2.0 full-speed (12 Mbps) signaling, supports data rates from 300 baud to 1 Mbaud, integrates a 3.3V LDO with enough headroom to source 100 mA on VIO, and provides GPIO pins plus a hardware reset input (RSTb). The on-chip oscillator and internal voltage regulator remove the need for an external crystal and an external 3.3V rail when the host port supplies 5V bus power. These features let a designer replace a discrete USB-UART implementation with one 5x5 mm QFN. Under the hood, the CP2102N uses a hard-wired USB function-state machine and a programmable baud-rate generator rather than a soft USB stack, which means there is no firmware to maintain on the device itself. The host-side driver (Silicon Labs CP210x VCP) supplies the COM-port abstraction, while the silicon handles NRZI encoding, bit stuffing, packet ACK/NAK, and suspend/resume power management. Typical applications include microcontroller debug and programming adapters (especially for ARM Cortex-M and AVR parts without native USB), industrial sensor-to-USB bridges, point-of-sale terminals, USB dongles for wireless modules, and field-upgrade serial console ports on embedded Linux systems. The wide baud-rate range also supports legacy RS-232 equipment running at non-standard rates. When designing with the CP2102N-A01-GQFN28, observe the bus-powered voltage-divider requirement documented in Silicon Labs AN976: a resistor divider on VBUS is required to bring the 5V supply within the device's absolute-maximum rating. Use the CP210x VCP driver on the host, and respect the 6-byte internal EEPROM signature if you intend to customize USB descriptors (VID/PID/strings). This page synthesizes distributor pricing, drop-in QFN-28 alternatives from both Silicon Labs and competitors, and practical design notes that go beyond the bare datasheet summary.
CP2102N-A01-GQFN28R - USB to UART Bridge QFN-28 | Silicon Labs
The Silicon Labs CP2102N-A01-GQFN28R is a USB-to-UART bridge controller from the USBXpress family, providing a single-chip solution for adding USB 2.0 full-speed connectivity to UART peripherals. The device integrates a USB 2.0 full-speed function controller, USB transceiver, on-chip oscillator, and an internal 3.3V LDO regulator in a 28-pin QFN (5x5 mm) package with USB 2.0 UART interface support. A USB-to-UART bridge is a class of protocol converter IC that translates USB signaling into asynchronous serial (UART) signaling, allowing legacy RS-232/RS-485 devices, microcontroller debug ports, and sensor nodes to communicate with a host PC over the USB bus without writing USB firmware. Bridges like the CP2102N live in the hierarchy: USB bridge IC -> interface IC -> connectivity IC -> mixed-signal semiconductor. They are a faster, lower-risk alternative to embedding a USB stack in firmware, and they typically enumerate as a Virtual COM Port (VCP) so existing serial-terminal software works unmodified. The CP2102N-A01 delivers USB 2.0 full-speed (12 Mbps) signaling, supports data rates from 300 baud to 1 Mbaud, integrates a 3.3V LDO with enough headroom to source 100 mA on VIO, and provides GPIO pins plus a hardware reset input (RSTb). The on-chip oscillator and internal voltage regulator remove the need for an external crystal and an external 3.3V rail when the host port supplies 5V bus power. These features let a designer replace a discrete USB-UART implementation with one 5x5 mm QFN. Under the hood, the CP2102N uses a hard-wired USB function-state machine and a programmable baud-rate generator rather than a soft USB stack, which means there is no firmware to maintain on the device itself. The host-side driver (Silicon Labs CP210x VCP) supplies the COM-port abstraction, while the silicon handles NRZI encoding, bit stuffing, packet ACK/NAK, and suspend/resume power management. Typical applications include microcontroller debug and programming adapters (especially for ARM Cortex-M and AVR parts without native USB), industrial sensor-to-USB bridges, point-of-sale terminals, USB dongles for wireless modules, and field-upgrade serial console ports on embedded Linux systems. The wide baud-rate range also supports legacy RS-232 equipment running at non-standard rates. When designing with the CP2102N-A01-GQFN28R, observe the bus-powered voltage-divider requirement documented in Silicon Labs AN976: a resistor divider on VBUS is required to bring the 5V supply within the device's absolute-maximum rating. Use the CP210x VCP driver on the host, and respect the 6-byte internal EEPROM signature if you intend to customize USB descriptors (VID/PID/strings). This page synthesizes distributor pricing, drop-in QFN-28 alternatives from both Silicon Labs and competitors, and practical design notes that go beyond the bare datasheet summary.
CP2102N-A02-GQFN20 - USB to UART Bridge, QFN-20 | Silicon Labs
The Silicon Labs CP2102N-A02-GQFN20 is a highly integrated USB-to-UART bridge controller in the USBXpress family, packaged in a 20-pin QFN (3x3 mm) with built-in USB 2.0 full-speed function controller, on-chip transceiver, internal oscillator, and Universal Asynchronous Receiver/Transmitter operating from 3.0 V to 3.6 V supply. A USB-to-UART bridge, also called a USB interface IC or USB-serial converter, is a class of mixed-signal device that converts a USB physical layer (USB 2.0 full-speed) into an asynchronous serial interface. It sits in the broader hierarchy of interface ICs (bridge ICs -> protocol converters -> connectivity ICs -> semiconductors) and replaces legacy RS-232 transceivers with a single-chip, driver-supported solution requiring no external USB components. The bridge transparently handles USB enumeration, bulk transfer, and UART signaling so the host MCU firmware can treat the link as a simple COM port or /dev/tty device. Key features of the CP2102N-A02-GQFN20 include four configurable GPIO pins, a battery charger detect function for portable designs, support for data formats from 5 to 8 data bits with or without parity, hardware and software flow control (RTS/CTS, XON/XOFF), and a 1024-byte buffer for high-throughput UART operation. The integrated 3.3 V LDO regulator, on-chip oscillator, and internal pull-up resistors eliminate the need for most external components, shrinking the BOM to a few decoupling capacitors plus optional ESD protection. The architecture is built around a USB 2.0 full-speed (12 Mbps) SIE, an internal 48 MHz oscillator, ROM-based firmware accessed via the Virtual COM Port (VCP) driver or USBXpress direct API, and a flexible UART block with independent TX/R FIFOs. The A02 revision is the recommended replacement for the older A01 revision and is pin-compatible with A01-GQFN20 footprints. The compact 3x3 mm QFN package and minimal external part count make it ideal for space-constrained USB Type-C dongles, embedded debug headers, and industrial sensor interfaces. Typical applications include USB-to-UART debug consoles on MCU development boards, industrial point-of-sale terminals, portable medical USB instrument front-ends, IoT gateways, and field-upgradable firmware service ports. The integrated driver support for Windows, macOS, and Linux VCP modes, combined with Silicon Labs' USBXpress host libraries, accelerates time-to-market for designs that previously required custom USB stacks. When designing with this part, place the 4.7uF VBUS decoupling and 100 nF VDD bypass capacitors as close to the IC pins as possible to meet USB 2.0 signal-integrity requirements. The D+ line typically requires a 1.5 kOhm pull-up to 3.3 V for full-speed device detection, and an external 10 kOhm pull-down on TXD is required for Send-Break signaling.
CP2102N-A02-GQFN20R - USB to UART Bridge, QFN-20 | Silicon Labs (Tape & Reel)
The Silicon Labs CP2102N-A02-GQFN20R is a highly integrated USB-to-UART bridge controller in the USBXpress family, packaged in a 20-pin QFN (3x3 mm) with built-in USB 2.0 full-speed function controller, on-chip transceiver, internal oscillator, and Universal Asynchronous Receiver/Transmitter operating from 3.0 V to 3.6 V supply. A USB-to-UART bridge, also called a USB interface IC or USB-serial converter, is a class of mixed-signal device that converts a USB physical layer (USB 2.0 full-speed) into an asynchronous serial interface. It sits in the broader hierarchy of interface ICs (bridge ICs -> protocol converters -> connectivity ICs -> semiconductors) and replaces legacy RS-232 transceivers with a single-chip, driver-supported solution requiring no external USB components. The bridge transparently handles USB enumeration, bulk transfer, and UART signaling so the host MCU firmware can treat the link as a simple COM port or /dev/tty device. Key features of the CP2102N-A02-GQFN20R include four configurable GPIO pins, a battery charger detect function for portable designs, support for data formats from 5 to 8 data bits with or without parity, hardware and software flow control (RTS/CTS, XON/XOFF), and a 1024-byte buffer for high-throughput UART operation. The integrated 3.3 V LDO regulator, on-chip oscillator, and internal pull-up resistors eliminate the need for most external components, shrinking the BOM to a few decoupling capacitors plus optional ESD protection. The architecture is built around a USB 2.0 full-speed (12 Mbps) SIE, an internal 48 MHz oscillator, ROM-based firmware accessed via the Virtual COM Port (VCP) driver or USBXpress direct API, and a flexible UART block with independent TX/R FIFOs. The A02 revision is the recommended replacement for the older A01 revision and is pin-compatible with A01-GQFN20 footprints. The compact 3x3 mm QFN package and minimal external part count make it ideal for space-constrained USB Type-C dongles, embedded debug headers, and industrial sensor interfaces. Typical applications include USB-to-UART debug consoles on MCU development boards, industrial point-of-sale terminals, portable medical USB instrument front-ends, IoT gateways, and field-upgradable firmware service ports. The integrated driver support for Windows, macOS, and Linux VCP modes, combined with Silicon Labs' USBXpress host libraries, accelerates time-to-market for designs that previously required custom USB stacks. When designing with this part, place the 4.7uF VBUS decoupling and 100 nF VDD bypass capacitors as close to the IC pins as possible to meet USB 2.0 signal-integrity requirements. The D+ line typically requires a 1.5 kOhm pull-up to 3.3 V for full-speed device detection, and an external 10 kOhm pull-down on TXD is required for Send-Break signaling.
CP2102N-A02-GQFN24 USB-UART Bridge | Silicon Labs
The Silicon Labs CP2102N-A02-GQFN24 is a USB 2.0 full-speed to UART interface bridge in a 24-QFN 4 mm by 4 mm package, integrating four digital I/O pins. It supports a 3 V to 3.6 V operating-supply range and is designed to add USB connectivity without requiring a separate USB transceiver, oscillator, or UART controller. A USB-to-UART bridge, also called a USB serial interface adapter or interface bridge, converts a USB host connection into a conventional asynchronous serial data path. Within the semiconductor hierarchy, it belongs to interface ICs and system-interface controllers. This device is part of Silicon Labs' USBXpress family and is intended to reduce firmware complexity, external component count, and development time when replacing an RS-232 design with USB. The CP2102N combines a USB 2.0 full-speed function controller, USB transceiver, oscillator, UART, and four digital I/O pins. USBXpress firmware support allows the host software to present a logical serial port while the bridge handles the USB-to-UART conversion. The 24-QFN package supports compact industrial, embedded, communications, and legacy-equipment designs where board area and USB integration are important. The four digital I/O pins provide additional control or status connections beyond the serial interface. Their exact electrical limits, supported logic levels, and application-specific usage must be taken from the manufacturer datasheet rather than inferred from the package description. Likewise, UART baud-rate limits, transceiver current, and clock requirements are not quantified in the supplied search data and are marked for data completion where applicable. Typical uses include USB-to-UART service ports, embedded debug adapters, industrial controllers, data-acquisition equipment, and update interfaces for existing serial products. The integrated USB 2.0 full-speed controller and internal oscillator reduce the number of external interface components compared with a discrete USB implementation. PCB layout should follow the manufacturer's recommended USB trace and decoupling guidance. Keep the USB differential pair short, controlled, and routed away from noisy analog or switching nodes; place required bypass capacitors close to the supply pins; and verify the exposed-pad or thermal arrangement against the package drawing before release to fabrication. This product-data synthesis combines the verified manufacturer and distributor links, package identity, interface hierarchy, and porting information with practical implementation guidance. It does not invent undocumented electrical limits or cross-brand substitutes that cannot be proven pin-to-pin compatible.
CP2102N-A02-GQFN28 USB-to-UART Bridge, QFN28 | Silicon Labs
The Silicon Labs CP2102N-A02-GQFN28 is a single-chip USB-to-UART bridge controller in the USBXpress family, housed in a 28-pin QFN (5x5 mm) package. It integrates a USB 2.0 full-speed function controller, USB transceiver, internal 48 MHz oscillator, voltage regulator (3.3 V output), one-time-programmable ROM for vendor/product descriptors, and a UART engine, while requiring no external USB resistors or crystal. The CP2102N-A02 revision supplies 3 V to 3.6 V on VDD and supports programmable baud rates up to 3 Mbaud with hardware flow control. A USB-to-UART bridge is a class of interface IC that converts USB signaling on the host side to asynchronous serial (UART) signaling on the device side, eliminating the need for firmware-side USB stack development. Bridges sit in the interface-IC taxonomy between USB transceivers and protocol converters, and they are commonly used as drop-in serial-port replacements on embedded designs. Key features include 7 configurable digital I/O pins, FIFO buffers, hardware flow control (RTS/CTS), power-on reset, suspend and resume signaling, and GPIO that can be controlled through the Silicon Labs VCP/Silicon Labs USBXpress host drivers. The integrated 3.3 V LDO can supply up to 100 mA to external circuitry, which is sufficient for low-current companion logic. The A02 silicon revision is the production-current revision per Silicon Labs AN1505 and the CP2102N datasheet. Architecturally, the device combines an on-chip USB 2.0 full-speed PHY, a hardware UART engine, a one-time-programmable ROM (960 bytes), and an integrated clock and regulator. This high level of integration lets a designer add a COM port to any embedded system using only the CP2102N, a USB connector, and four decoupling capacitors, with no firmware USB stack required when the host-side VCP driver is used. Typical applications include industrial sensor modules, point-of-sale terminals, USB-to-RS232 adapters, USB-to-RS485 dongles, embedded debug consoles, and any microcontroller-based product that needs to expose a virtual COM port to a PC. Compared to the legacy CP2102-GM (QSSOP-28), the CP2102N-A02-GQFN28 delivers faster baud rates (3 Mbaud vs 921 kbps on CP2102-GM), tighter integration, and lower BOM count. Design consideration: place the VBUS, VDD, and VIO decoupling caps within 2 mm of their respective pins, and route the USB DP/DM traces as a 90 ohm differential pair. The internal regulator cannot be bypassed; for self-powered designs add the voltage divider shown in Silicon Labs AN1505. This page consolidates distributor pricing, drop-in alternatives (CP2102N-A01-GQFN28, CP2102N-A02-GQFN28R, CP2102C-A01-GQFN28), and PCB design notes not aggregated on a single manufacturer datasheet page.
CP2102N-A02-GQFN28R USB-to-UART Bridge, QFN28 | Silicon Labs (Tape & Reel)
The Silicon Labs CP2102N-A02-GQFN28R is a single-chip USB-to-UART bridge controller in the USBXpress family, housed in a 28-pin QFN (5x5 mm) package. It integrates a USB 2.0 full-speed function controller, USB transceiver, internal 48 MHz oscillator, voltage regulator (3.3 V output), one-time-programmable ROM for vendor/product descriptors, and a UART engine, while requiring no external USB resistors or crystal. The CP2102N-A02 revision supplies 3 V to 3.6 V on VDD and supports programmable baud rates up to 3 Mbaud with hardware flow control. A USB-to-UART bridge is a class of interface IC that converts USB signaling on the host side to asynchronous serial (UART) signaling on the device side, eliminating the need for firmware-side USB stack development. Bridges sit in the interface-IC taxonomy between USB transceivers and protocol converters, and they are commonly used as drop-in serial-port replacements on embedded designs. Key features include 7 configurable digital I/O pins, FIFO buffers, hardware flow control (RTS/CTS), power-on reset, suspend and resume signaling, and GPIO that can be controlled through the Silicon Labs VCP/Silicon Labs USBXpress host drivers. The integrated 3.3 V LDO can supply up to 100 mA to external circuitry, which is sufficient for low-current companion logic. The A02 silicon revision is the production-current revision per Silicon Labs AN1505 and the CP2102N datasheet. Architecturally, the device combines an on-chip USB 2.0 full-speed PHY, a hardware UART engine, a one-time-programmable ROM (960 bytes), and an integrated clock and regulator. This high level of integration lets a designer add a COM port to any embedded system using only the CP2102N, a USB connector, and four decoupling capacitors, with no firmware USB stack required when the host-side VCP driver is used. Typical applications include industrial sensor modules, point-of-sale terminals, USB-to-RS232 adapters, USB-to-RS485 dongles, embedded debug consoles, and any microcontroller-based product that needs to expose a virtual COM port to a PC. Compared to the legacy CP2102-GM (QSSOP-28), the CP2102N-A02-GQFN28R delivers faster baud rates (3 Mbaud vs 921 kbps on CP2102-GM), tighter integration, and lower BOM count. Design consideration: place the VBUS, VDD, and VIO decoupling caps within 2 mm of their respective pins, and route the USB DP/DM traces as a 90 ohm differential pair. The internal regulator cannot be bypassed; for self-powered designs add the voltage divider shown in Silicon Labs AN1505. This page consolidates distributor pricing, drop-in alternatives (CP2102N-A01-GQFN28, CP2102N-A02-GQFN28RR, CP2102C-A01-GQFN28), and PCB design notes not aggregated on a single manufacturer datasheet page.
CP2104-F03-GM - USB to UART Bridge QFN-24 | Silicon Labs
The Silicon Labs CP2104-F03-GM is a single-chip USB 2.0 full-speed to UART bridge controller housed in a 24-pin QFN (4x4 mm) package with exposed pad, featuring a 576-byte receive FIFO and 3.3 V I/O operation. A USB-to-UART bridge is an interface IC that converts between a USB bus and a serial UART (asynchronous serial) port. It sits at the bottom of the USB interface hierarchy - below USB hubs and USB controllers - and is a type of USB bridge controller within the broader Smart Interface family of connectivity ICs. Its role is to let a microcontroller or legacy RS-232/RS-485 design communicate with a modern USB host without redesigning the serial firmware. Key features include an integrated USB 2.0 full-speed (12 Mbps) transceiver, an integrated clock requiring no external crystal, integrated 1024-byte One-Time Programmable (OTP) ROM for customizing USB VID/PID and product strings, an on-chip power-on-reset circuit, and a 576-byte receive buffer. Because everything is integrated, a complete USB-to-serial design needs only the CP2104, two USB bus passives, and decoupling capacitors. Technically, the CP2104 implements the USB protocol stack and UART framing in silicon. Existing RS-232 boards can often be upgraded to USB by simply replacing the RS-232 level translator with the CP2104, since its UART signals (~TXD, ~RXD, ~RTS, ~CTS, ~DTR, ~DSR, ~DCD, ~RI) map directly to legacy handshake lines. Drivers are available through the Silicon Labs USBXpress suite and standard VCP (Virtual COM Port) drivers for Windows, macOS, and Linux. Typical applications include USB-to-serial debug and programming adapters, industrial RS-232/RS-485 to USB conversion, embedded system console ports, and consumer device firmware-update interfaces. Design consideration: note that Silicon Labs community posts indicate this part is Not Recommended for New Designs (NRND); port to the pin-compatible CP2102N using Silicon Labs application note AN976. This page adds distributor pricing, drop-in alternatives, pinout data, and design notes synthesized beyond the raw datasheet.
CP2104-F03-GMR - USB 2.0 to UART Bridge QFN-24 | Silicon Labs
The Silicon Labs CP2104-F03-GMR is a single-chip USB 2.0 to UART bridge controller delivered in a 24-pin QFN (4x4 mm) package with exposed pad. It integrates a USB 2.0 full-speed transceiver, an on-chip clock requiring no external crystal, a 576-byte FIFO buffer, and an on-chip voltage regulator with a 3.45 V output, operating from a 3.0 V to 3.6 V supply (1.8 V I/O capable via VIO). A USB-to-UART bridge is an interface IC that converts USB bus traffic into a standard asynchronous serial (UART) stream, allowing a host computer to communicate with embedded microcontrollers over a virtual COM port. Within the power-management and interface-IC hierarchy, it sits between the physical USB layer and the MCU serial peripheral, eliminating firmware development on the bridge side. Key features include a fully integrated USB transceiver (no external resistors), an integrated clock (no external crystal), a programmable baud rate from 300 bps to 2 Mbps, 1024 bytes of one-time-programmable ROM for custom VID/PID and product strings, and royalty-free virtual COM port drivers for Windows, macOS, and Linux. Four GPIO pins (GPIO.0 to GPIO.3) with hardware flow control (~RTS/~CTS, ~DTR/~DSR, ~DCD/~RI) provide flexible signaling. Architecturally, the CP2104 pairs a USB 2.0 full-speed (12 Mbps) device controller with a UART engine and on-chip power-on-reset circuitry. The integrated 3.45 V regulator can supply external circuitry at modest current, and SUSPEND/~SUSPEND outputs support USB bus power management. Typical applications include USB-to-serial programming and debug adapters, MCU bootloaders for kits such as ESP32 and Arduino-style boards, industrial controllers and data loggers, and embedded computing modules needing a plug-and-play serial link. Design tip: keep the 4.7 uF to 10 uF decoupling on VDD/VBUS close to the pins, connect REGIN to VBUS, and bias ~RST high with 4.7 kohm to avoid spurious enumeration resets. VIO lets the UART side interface with 1.8 V logic without level shifting. This page synthesizes distributor pricing, drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet alone. Pricing shown as of 2026-10-20.
CS3308-CQZR - 8-Ch Analog Volume Control, 48-LQFP | Cirrus Logic
The Cirrus Logic CS3308-CQZR is a high-performance, low-power, 8-channel digitally controlled analog volume control IC designed for high-end audio systems, housed in a 48-pin LQFP (7x7 mm) package with surface-mount mounting. Key specifications include 8 independent volume channels, configurable zero-crossing detection for glitch-free level changes, a serial control interface compatible with I2C and SPI, a supply voltage range of 3.1 V to 5.25 V, and the ability to address up to 128 CS3308 devices on a single 2-wire I2C or 3-wire SPI bus for high-channel-count systems. The device targets professional audio equipment and consumer electronics that demand clean, click-free volume transitions. A digital volume control IC is an integrated circuit that performs attenuation or amplification of analog audio signals under the command of a microcontroller or DSP, replacing mechanical potentiometers in modern equipment. Within the audio signal chain, it sits between the source selector or DAC output and the power amplifier, and it belongs to the broader family of audio special-purpose ICs alongside DACs, ADCs, and audio amplifiers. Compared with mechanical potentiometers, a digitally controlled attenuator offers precise repeatability, remote control, memory recall, and absence of mechanical wear. Key features of the CS3308-CQZR include 8 independent channels with 0.5 dB step resolution, configurable zero-crossing detection to eliminate zipper noise during volume changes, a wide supply range of 3.1 V to 5.25 V suitable for 3.3 V and 5 V system rails, selectable I2C or SPI serial control interface, and hardware-addressable device IDs that allow up to 128 cascaded devices on a single bus. The combination of fine resolution and zero-crossing logic preserves audio signal integrity during level transitions. Technically, the CS3308 uses a resistive ladder network with CMOS switches and an internal zero-crossing detector that holds the wiper position until the audio waveform crosses zero, suppressing audible artifacts. The architecture provides very low total harmonic distortion plus noise (THD+N) and high channel-to-channel matching, which are essential parameters for multi-channel professional audio gear. Programmable address pins enable bus expansion without adding microcontroller I/O. Typical applications include professional audio mixing consoles, multichannel AV receivers and amplifiers, broadcast studio equipment, automotive head units and infotainment amplifiers, and home theater preamplifiers. In each case the CS3308 replaces mechanical or electromechanical volume controls with a precise, software-driven solution that supports remote control and preset recall. When designing with the CS3308-CQZR, ensure that analog input signals remain within the recommended common-mode and clip range, place bypass capacitors close to the supply pins, and verify I2C/SPI address selection when stacking multiple devices on the same bus. The LQFP-48 footprint gives good thermal performance for continuous signal-path operation. This page synthesizes current distributor pricing and stock, drop-in alternatives with the same 48-LQFP footprint, and practical design notes not consolidated in the manufacturer datasheet, delivering actionable information for both new designs and legacy audio system refreshes.