The Broadcom B50185B0KFBG is a highly integrated Octal Gigabit Ethernet (GE) PHY transceiver designed for high-density networking equipment. As a member of Broadcom's industry-leading Ethernet PHY portfolio, this device integrates eight complete 10/100/1000BASE-T PHY transceivers into a single package, delivering exceptional port density while minimizing board space and system cost.
The Broadcom B50185B0KFBG is a highly integrated Octal Gigabit Ethernet (GE) PHY transceiver designed for high-density networking equipment. As a member of Broadcom's industry-leading Ethernet PHY portfolio, this device integrates eight complete 10/100/1000BASE-T PHY transceivers into a single package, delivering exceptional port density while minimizing board space and system cost.
This device features U/QSGMII (Universal/Quad Serial Gigabit Media Independent Interface) support, providing designers with flexible host-side interface options that simplify PCB layout, reduce signal trace count, and lower overall system power consumption. The B50185B0KFBG is manufactured by Broadcom Limited (formerly Avago Technologies) and remains in Active production status, ensuring long-term supply availability for professional networking equipment manufacturers.
Traditional Gigabit Ethernet PHY designs typically require multiple discrete PHY chips to achieve 8-port density, consuming significant PCB real estate and increasing BOM complexity. The B50185B0KFBG consolidates eight full 10/100/1000BASE-T PHY transceivers into one compact package, delivering:
- 8× higher port density per chip compared to single-port PHYs
- Simplified PCB layout with reduced routing complexity
- Lower overall system cost through component consolidation
- Reduced power consumption versus equivalent multi-chip implementations
The device supports multiple host-side interface modes, including SGMII, QSGMII (Quad SGMII), and USGMII (Universal SGMII). This flexibility allows system designers to choose the optimal connection scheme based on their host processor or switch chip capabilities:
| Interface | Description | Best Use Case |
| SGMII | Serial Gigabit MII – 1.25 Gbps per port | Legacy designs with lower port counts |
| QSGMII | Quad SGMII – aggregates 4 ports over 1 serial lane | High-density designs with moderate bandwidth |
| USGMII | Universal SGMII – enhanced flexibility | Next-gen designs requiring maximum interface flexibility |
The U/QSGMII interface reduces the number of signal traces between the PHY and the MAC/switch fabric, simplifying PCB routing and enabling higher port density in space-constrained designs.
Broadcom brings over 50 years of innovation, collaboration, and engineering excellence to every product. With roots in AT&T/Bell Labs, Lucent, and Hewlett-Packard/Agilent, the company has established itself as a global leader in semiconductor and infrastructure software solutions. The B50185B0KFBG benefits from this rich heritage, delivering:
- Industry-leading signal integrity for robust communication over extended cables or PCB traces
- Proven reliability backed by Broadcom's rigorous quality standards
- Comprehensive technical support through Broadcom's global engineering network
Unlike many legacy Ethernet PHY devices that have been discontinued or face supply constraints, the B50185B0KFBG maintains Active product status. This ensures:
- Long-term supply availability for ongoing production runs
- Consistent pricing without end-of-life premiums
- Continued technical support and documentation access
- Peace of mind for system designers planning multi-year product lifecycles
| Parameter | Specification |
| Manufacturer | Broadcom Limited (formerly Avago Technologies) |
| Part Number | B50185B0KFBG |
| Product Category | Integrated Circuits (ICs) > Interface > Drivers, Receivers, Transceivers |
| Description | OCTAL GE PHY WITH U/QSGMII AND C |
| Function | Provides hardware resources for communication over extended cables or PCB traces |
| Data Rate Support | 10 Mbps, 100 Mbps, 1 Gbps (10/100/1000BASE-T) |
| Port Count | 8 full transceivers |
| Host Interface | SGMII / QSGMII / USGMII |
| Package Type | BGA |
| Packaging | Tape & Reel (TR) or Tray |
| Standard Pack Quantity | 420 |
| Product Status | Active |
| RoHS Status | ROHS3 Compliant |
| Lead-Free Status | Pbfree Code: yes |
| Factory Lead Time | 3 Weeks |
> Note: Detailed electrical parameters (voltage supply, operating temperature, package dimensions, pin count) are not fully disclosed in public datasheets. For complete specifications, please refer to the official Broadcom datasheet available through authorized distributors.
Eight complete 10/100/1000BASE-T PHY transceivers integrated into a single package, dramatically reducing PCB footprint and BOM complexity.
Support for SGMII, QSGMII, and USGMII interface modes enables optimal connection to a wide range of host processors, network processors, and switch fabrics.
Serialized interface reduces signal trace count between PHY and MAC, enabling cleaner layouts, lower EMI, and higher port density in space-constrained designs.
Built on Broadcom's industry-leading PHY technology, delivering reliable communication over extended cables and challenging PCB environments.
Fully RoHS3 compliant and lead-free, meeting global environmental regulations.
Ensures long-term availability and supply chain stability for professional equipment manufacturers.
Backed by over 50 years of semiconductor innovation and engineering excellence.
The B50185B0KFBG is designed for high-density networking equipment requiring 8 ports of Gigabit Ethernet connectivity in a compact form factor. Key application areas include:
- Top-of-rack (ToR) switches
- Data center aggregation switches
- High-density Ethernet adapters
- Gigabit Ethernet residential gateways
- Broadband customer premises equipment (CPE)
- Multi-port home networking switches
- Carrier Ethernet switches
- Metro Ethernet access devices
- Base station backhaul equipment
- Factory automation switches
- Industrial Ethernet field devices
- Machine-to-machine (M2M) communication modules
- Server network interface cards (NICs)
- Storage area network (SAN) adapters
- Converged network adapters
- Power plant automation networks
- Alternative energy system monitoring
- Substation automation equipment
- Professional AV-over-IP equipment
- Digital signage network interfaces
Active – The device remains in full production with stable supply.
3 Weeks – Short lead time enables rapid procurement and production planning.
Multiple authorized distributors maintain inventory:
- Dasenic: 768 units in stock
- 114ic.com: 7,786 units (Broadcom, 25+)
- Various distributors: 20,000+ units available from multiple sources
| Quantity | Unit Price (USD) | Source |
| 1+ | $40.01 | Cytech Systems |
| 10+ | $37.61 | Cytech Systems |
| 100+ | $35.61 | Cytech Systems |
| 126+ | $30.63 | Anhuagaoic |
| 126+ | $68.30 | Dasenic |
| 420+ | $25.73 | What-is-IC |
| 1000+ | $33.61 | Cytech Systems |
> ⚠️ Price Alert: Pricing varies significantly between distributors based on quantity, region, and market conditions. Contact authorized distributors directly for real-time quotes.
- Standard pack: 420 units (tray)
- Some distributors offer MOQ of 1 for sample quantities
- Tape & Reel (TR)
- Tray
- In-stock orders typically ship within 3 days
- International shipping via DHL, FedEx, UPS
| Feature | B50185B0KFBG | Single-Port PHY (×8) | Quad-Port PHY (×2) |
| Port Density | 8 ports / chip | 8 ports / 8 chips | 8 ports / 2 chips |
| PCB Footprint | Smallest | Largest | Medium |
| BOM Complexity | Lowest | Highest | Medium |
| Routing Complexity | Lowest (serial interface) | Highest (parallel interface) | Medium |
| Power Efficiency | Best | Worst | Medium |
| System Cost | Lowest | Highest | Medium |
| Interface Flexibility | SGMII/QSGMII/USGMII | Limited | Limited |
The B50185B0KFBG delivers the optimal combination of port density, PCB efficiency, and system cost, making it the preferred choice for high-density Gigabit Ethernet designs.
The Broadcom B50185B0KFBG represents the state-of-the-art in Octal Gigabit Ethernet PHY technology, delivering:
| Advantage | Benefit |
| ✅ 8 ports in 1 chip | Maximum port density, minimal PCB footprint |
| ✅ U/QSGMII interface | Flexible host connectivity, simplified routing |
| ✅ 10/100/1000BASE-T support | Full Gigabit Ethernet compatibility |
| ✅ RoHS compliant | Meets global environmental standards |
| ✅ Active production | Stable supply, no obsolescence risk |
| ✅ Broadcom quality | Industry-leading reliability and performance |
For designers of high-density networking equipment – from data center switches to industrial Ethernet devices – the B50185B0KFBG offers the ideal balance of integration, performance, and cost. Its octal density and flexible U/QSGMII interface enable compact, power-efficient designs that would be impossible with discrete PHY implementations.
