BCM84894B0IFSBG - Quad-Port Multi-Rate Ethernet PHY | Broadcom
N.º da peça: BCM84894B0IFSBG ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $285 | $285,00 |
| 10 | $268 | $2.680,00 |
| 100 | $245 | $24.500,00 |
| 500 | $222 | $111.000,00 |
| 1.000 | $205 | $205.000,00 |
BCM84894B0IFSBG Visão geral
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.
Alternativas drop-in para BCM84894B0IFSBG — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
BCM84891B0IFSBG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
BCM84848B0IFSBG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
BCM84894B0IFSBG-EVB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
BCM84894A0IFSBG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
BCM84894B1IFSBG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
BCM84894B0IFSBG Classificações máximas e características elétricas
| Função | Quad-Port Multi-Rate Ethernet PHY Transceiver |
| Supported Data Rates | 10G / 25G / 100G per port |
| Ethernet Standards | IEEE 802.3bj, 802.3bm, 802.3bs, 802.3by, 802.3an (auto-negotiation) |
| Tipo de interface | Backplane KR / Direct-Attach Copper CR |
| Number of Ports | 4 |
| Package Type | FBGA |
| Tipo de montagem | Surface Mount |
| MAC Interface | SERDES (KR/CR-capable PCS/PMA) |
| Signal Conditioning | Adaptive CTLE / DFE / FFE |
| Reach | Backplane + DAC up to ~5 m (KR/CR) |
| Compliance | RoHS per Broadcom product page |
| Lifecycle | Active production |
| Manufacturer | Broadcom Inc. |
Guia de Configuração de Pinos do BCM84894B0IFSBG fbga
Configuração de pinos para BCM84894B0IFSBG (pacote fbga). Este componente analógico possui pinos de entrada, saída e alimentação. Consulte o datasheet do fabricante para configurações de offset null, compensação e pino de enable. Ideal para circuitos de condicionamento de sinal e amplificadores.
Nenhum dado detalhado de pinagem disponível para BCM84894B0IFSBG.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
BCM84894B0IFSBG é adequado para 6 aplicaçãos: 100G/25G Top-of-Rack Data Center Switch, Hyperscale Leaf-Spine Network Fabric, High-Performance Network Interface Card (NIC), 5G Telco Backhaul and Midhaul Equipment, Ethernet Storage Fabric (NVMe-oF / iSCSI), High-Frequency Trading / Low-Latency Networks.
100G/25G Top-of-Rack Data Center Switch
The BCM84894B0IFSBG is a natural fit for top-of-rack (ToR) data center switch line cards where each port can independently operate at 10G, 25G, or 100GBASE-KR/CR. Its quad-port density enables a QSFP28 cage per port with mixed-speed uplink and downlink capability, eliminating the need for separate 25G and 100G PHY silicon. Per-port auto-negotiation across the 802.3bj/bm/bs/by family lets the same hardware serve 25G server access today and migrate to 100G servers without board redesign. The integrated CTLE/DFE/FFE compensation supports backplane traces up to ~5 m of DAC cable, which matches typical ToR-to-leaf cable lengths.
Recomendado
Hyperscale Leaf-Spine Network Fabric
In hyperscale leaf-spine fabrics where every port runs 100G, the BCM84894B0IFSBG's 100GBASE-KR4/CR4 capability per port delivers four 100G links per device, enabling compact 32x100G or 64x100G line cards. Its low-latency PCS/PMA architecture preserves cut-through switching latency budgets that hyperscale operators depend on for east-west traffic patterns. Adaptive equalization copes with the long, lossy backplanes typical of 1U-2U chassis designs. Combined with Broadcom's StrataXGS or Tomahawk switch silicon, the BCM84894 family powers some of the largest cloud-provider fabrics in production today.
Recomendado
High-Performance Network Interface Card (NIC)
Dual- and quad-port 25G/100G NICs use the BCM84894B0IFSBG as the line-side PHY to interface between the NIC controller ASIC and QSFP28 cages. The quad-port density supports a 4x25G or 1x100G configuration in a single PHY, reducing board area and BOM cost versus discrete single-port PHYs. Adaptive KR/CR signal conditioning handles both backplane mid-planes and direct-attach copper (DAC) cables used in server-to-TOR connections. Integrated IEEE 1588v2 timestamping supports financial-trading and telco workloads that require sub-microsecond synchronization across NIC populations.
Recomendado
5G Telco Backhaul and Midhaul Equipment
5G mobile infrastructure requires deterministic, low-latency Ethernet for backhaul and midhaul links between radio units, distributed units, and centralized units. The BCM84894B0IFSBG's 25G/100G KR/CR support plus IEEE 1588v2 timestamping meets the synchronization accuracy required by 3GPP timing specifications. Its per-port auto-negotiation enables a single line card to serve mixed 10G/25G CPRI/eCPRI traffic alongside 100G operator traffic. The device's industrial temperature tolerance (per Broadcom datasheet) supports outdoor-cabinet deployments typical of telco aggregation sites.
Recomendado
Ethernet Storage Fabric (NVMe-oF / iSCSI)
High-performance Ethernet storage fabrics such as NVMe-over-Fabrics (NVMe-oF) and iSCSI run over 25G/100G KR/CR links, where the BCM84894B0IFSBG provides the line-side physical layer. Its low-latency PCS/PMA path preserves the storage I/O latency budget that flash arrays demand for sub-100-microsecond access. The quad-port density supports 4x25G or 1x100G per storage controller port, enabling high-throughput storage target interfaces. Adaptive equalization across long backplanes and DAC cables is critical for hyperconverged storage rack deployments.
Recomendado
High-Frequency Trading / Low-Latency Networks
High-frequency trading (HFT) and other latency-sensitive networks rely on deterministic cut-through switching with sub-microsecond PHY-layer latency. The BCM84894B0IFSBG's low-latency PCS/PMA architecture minimizes per-hop delay while still delivering full 25G/100G line-rate operation. IEEE 1588v2 timestamping provides the synchronization accuracy that regulated trading exchanges require for transaction timestamping. The device's adaptive equalization handles both intra-datacenter backplanes and inter-floor DAC cable runs common in exchange co-location facilities.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para BCM84894B0IFSBG — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | BCM84891B0IFSBG | BCM84848B0IFSBG | BCM84894A0IFSBG |
|---|---|---|---|---|
| Brand | Broadcom | Broadcom | Broadcom | Broadcom |
| Package | FBGA | FBGA - same family | FBGA - same family | FBGA - same |
| Max Per-Port Rate | 100G | 100G | 40G (older generation) | 100G |
| Multi-Rate (10G/25G/100G) | Yes | Yes | Limited (no 100G) | Yes |
| Backplane Interface | KR / CR | KR / CR | KR / CR | KR / CR |
| IEEE 1588v2 Timestamping | Yes | Yes | Limited | Yes |
| Silicon Revision | B0 | B0 | B0 | A0 (older) |
Principais diferenciais
- Quad-port density with per-port 100G capability (vs BCM84891B0IFSBG)
- Higher per-port rate ceiling vs 40G legacy family (vs BCM84848B0IFSBG)
- Latest silicon revision with errata fixes (vs BCM84894A0IFSBG)
Notas de projeto
Estimated: at full 100G x4 configuration the BCM84894B0IFSBG dissipates several watts and requires a thermal-via array under the FBGA plus chassis airflow. Use the Broadcom datasheet theta-JA with your PCB copper stack-up to compute junction temperature rise. For high-density 1U switch designs, design the chassis airflow to provide at least 1-2 m/s across the device thermal pad.
Route 25G/100G KR/CR lanes as 100-ohm differential stripline with controlled impedance and skew under 1 ps. Use low-loss PCB material (Megtron 6 or equivalent) for backplane traces longer than 8 inches. Place AC-coupling capacitors within 200 mil of the BCM84894B0IFSBG transmitter balls and ensure the reference clock has a clean, low-jitter source such as a dedicated TCXO or SI5341.
Validate the backplane or DAC cable channel loss budget against the IEEE 802.3bj/bm insertion-loss template before committing to layout. The BCM84894B0IFSBG adaptive CTLE/DFE/FFE compensates up to ~30 dB loss at Nyquist but cannot rescue a poorly designed channel. Run a pre-layout channel simulation using the IBIS-AMI model from Broadcom to confirm eye-margin margins > 50 mV at the receiver.
Do not omit the per-port MDIO or I2C management interface; firmware is required for auto-negotiation, KR training, and 1588 timestamping configuration. Ensure the BCM84894B0IFSBG reset sequence follows the datasheet power-rail timing - out-of-order ramp-up can leave the PHY in an undefined state requiring a power cycle. Always use the latest Broadcom reference firmware release notes for known errata on the B0 silicon revision.
Informações de conformidade
RoHS compliance per Broadcom BCM84894 product page environmental section. AEC-Q100 is not applicable (data center / networking IC, not automotive-grade). Confirm halogen-free status and full REACH declaration with Broadcom sales for production documentation.
