B50280C1KFBG - Octal 10/100/1000 PHY Transceiver | Broadcom
MPN： B50280C1KFBG ✓ 啟用中B50280C1KFBG 概覽
An Ethernet PHY (Physical Layer Device) is the lowest-speed layer of the OSI networking stack, handling the analog signaling, encoding/decoding, clock recovery, and link training required to push bits over a Cat5e/Cat6 cable. PHY transceivers sit beneath the MAC and switch fabric; an octal PHY like the B50280C1KFBG aggregates eight Gigabit PHYs into one IC to simplify PCB routing, reduce component count, and minimize board area compared to using eight discrete single-port PHYs. PHY -> Ethernet transceiver -> Networking IC -> Interface IC -> Integrated Circuit is the broader hypernym chain.
The B50280C1KFBG supports auto-negotiation, auto-MDI/MDIX crossover, Energy Efficient Ethernet (EEE, IEEE 802.3az), and 802.1AE MACsec readiness depending on firmware build. Each port independently negotiates 10/100/1000BASE-T, recovers clock and data, and presents GMII/RGMII to the host MAC. The integrated DSP-based echo canceller and baseline wander correction enable robust 100m Cat5e link performance without external magnetics beyond the standard 1:1 transformer.
Typical applications include top-of-rack and leaf switches, network interface cards with multi-port PHYs, router line cards, industrial Ethernet switches, and telecom access equipment. Per-port power below ~1W and the octal integration make it especially suited for chassis switches where hundreds of Gigabit ports must be supported within thermal and power budgets.
Designers should pay attention to the SGMII/SerDes reference clock architecture, the quad-port group power sequencing, and the requirement for dedicated 1:1 isolation transformers per port. PCB layout for the B50280C1KFBG demands careful 100-ohm differential pair routing for each of the eight MDI channels with strict length matching.
This page synthesizes distributor pricing, package specifications, and drop-in alternatives that are not found in the manufacturer datasheet alone, providing a single reference for engineers evaluating the B50280C1KFBG against multi-port PHY options from Broadcom and competitor families.
直接替換替代品，適用於 B50280C1KFBG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品B50280C1KFBG 最大額定值與電氣特性
| Product Type | Ethernet PHY Transceiver (Physical Layer Device) |
| Number of Ports | 8 (Octal) |
| Supported Data Rates | 10 Mbps, 100 Mbps, 1000 Mbps |
| Network Standards | 10BASE-T, 100BASE-TX, 1000BASE-T |
| Auto-Negotiation | Yes (IEEE 802.3 Clause 28) |
| Auto-MDI/MDIX | Yes |
| Energy Efficient Ethernet | IEEE 802.3az (EEE) support |
| Cable Reach | 100 m over Cat5e/Cat6 UTP |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant (per LCSC listing) |
B50280C1KFBG standard 腳位配置指南
B50280C1KFBG（standard 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： B50280C1KFBG.
請參閱 資料表 以查看完整腳位配置。
典型應用
B50280C1KFBG 適用於 6 應用s: Top-of-Rack / Leaf Ethernet Switches, Network Interface Cards (NICs) and LOM, Industrial Ethernet Switches, Telecom Access Equipment and CPE, Router Line Cards, Test Equipment and Network Monitoring Taps.
Top-of-Rack / Leaf Ethernet Switches
The B50280C1KFBG delivers eight Gigabit copper ports per IC, making it ideal for high-density top-of-rack and leaf switches where dozens of ports must fit on a single line card. Each port supports 10/100/1000BASE-T auto-negotiation with full 100 m Cat5e reach, allowing switch designers to populate 48- or 96-port switches with only six to twelve B50280C1KFBG devices. The integrated EEE (802.3az) drops per-port power during low-utilization periods, helping 48-port switches stay within typical 100-150W thermal budgets. Designers pair it with a Broadcom or compatible switch ASIC over SGMII/QSGMII SerDes lanes.
推薦
Network Interface Cards (NICs) and LOM
Quad- and octal-port NICs use the B50280C1KFBG to deliver multi-Gigabit server connectivity without consuming excessive PCIe card real estate. The PHY presents RGMII/SGMII to a NIC controller ASIC, while its integrated DSP-based echo canceller ensures 1000BASE-T operation across 100 m of Cat5e in data-center cabling. Per-port power below ~1W keeps the four- and eight-port NICs within PCIe slot thermal limits. Auto-MDI/MDIX eliminates crossover cable concerns for end users installing these adapters.
推薦
Industrial Ethernet Switches
Industrial managed switches in factory automation and process control rely on the B50280C1KFBG to provide rugged, multi-port Gigabit connectivity over wide temperature ranges. Each port's auto-negotiation and auto-MDI/MDIX simplify commissioning when machines from different vendors are interconnected. The PHY's Energy Efficient Ethernet (802.3az) reduces heat and power consumption in always-on industrial networks. Designers should confirm the industrial temperature grade variant with Broadcom before deployment in -40C to +85C environments.
推薦
Telecom Access Equipment and CPE
DSLAMs, PON OLTs, and enterprise CPE gateways use the B50280C1KFBG to provide multiple Gigabit Ethernet user-facing ports while keeping bill-of-materials cost manageable. The octal integration means a single PHY handles eight subscriber-side links, simplifying EMC compliance and reducing PCB layer count. The device's GMII/RGMII/SGMII host interface allows it to be paired with telecom SoCs from multiple vendors, supporting both fiber-fed and copper-fed access architectures.
推薦
Router Line Cards
Router line cards benefit from the B50280C1KFBG's high port density and per-port EEE power management. Each port supports full-duplex 1000BASE-T with integrated DSP-based echo cancellation, allowing the line card to terminate dozens of Gigabit links without external PHYs. Pair the B50280C1KFBG with a router network processor over SGMII/SerDes for compact, low-power line-card designs. Designers should observe the strict 100-ohm differential pair layout for each of the eight MDI channels.
推薦
Test Equipment and Network Monitoring Taps
Network test taps, inline packet brokers, and monitoring aggregators use the B50280C1KFBG to replicate or terminate multiple Gigabit links for analysis. Each port independently auto-negotiates speed and duplex, allowing taps to monitor mixed 10/100/1000 traffic without configuration. The PHY's low per-port power and small footprint let designers fit many ports into 1U monitoring appliances that must run cool and quiet. Firmware-controlled loopback features assist in production test and validation.
推薦
推薦產品摘要
工程參考資料，適用於 B50280C1KFBG — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 88X5113-A1-BVW4C000 |
|---|---|---|
| Brand | Broadcom | Marvell Technology |
| Number of Ports | 8 (Octal) | Multi-port (octal-class) |
| Supported Data Rates | 10/100/1000 Mbps | 10/100/1000 Mbps |
| Energy Efficient Ethernet | Yes (802.3az) | Yes (802.3az) |
| Auto-MDI/MDIX | Yes | Yes |
| MAC Interface | GMII/RGMII/SGMII | SGMII/QSGMII |
| Cable Reach | 100 m Cat5e/Cat6 | 100 m Cat5e/Cat6 |
主要差異化特點
- Broadcom SDK and reference design ecosystem (對比88X5113-A1-BVW4C000)
- Octal port density reduces PCB area per port (對比AR8031-AL1B-R)
- Energy Efficient Ethernet (802.3az) integrated (對比88X5113-A1-BVW4C000)
設計說明
Each of the B50280C1KFBG's eight MDI ports requires a 100-ohm differential pair routed from the PHY ball/pin to the RJ45 magnetics. Maintain length matching within 150 mils intra-pair and 2000 mils inter-pair across all four pairs of each port, and route over a continuous reference ground plane with no splits. Place the 1:1 isolation transformer within 1 inch of the PHY MDI pins to minimize return loss and EMI.
Estimate: at ~0.9 W per active port, the B50280C1KFBG with all eight ports linked and running 1000BASE-T draws roughly 7 W. Decouple each analog and digital supply rail with 0.1 uF X7R ceramic capacitors placed within 50 mils of the supply pins, plus a bulk 10-22 uF tantalum or ceramic capacitor. Use a low-noise LDO for the analog rails; switching regulator noise on AVDD will couple into MDI signaling and degrade BER.
Estimated: per-port EEE power savings (typically 30-50% reduction at low utilization) depend on link partner cooperation - verify the connected device also supports 802.3az before assuming power savings in field deployments. Magnetics selection matters: use only transformer modules specifically qualified for 1000BASE-T (e.g., with integrated common-mode chokes); Cat5e magnetics designed for 100BASE-TX will not pass 1000BASE-T signaling compliance.
合規資訊
RoHS compliance confirmed via LCSC distributor listing (C3214126). Other compliance fields not stated in verified web data and left as unknown. AEC-Q100 is not applicable (Ethernet PHY is not an automotive-grade part unless explicitly qualified).
