BCM53158XUB1KFBG - 8-Port GE Robo2 Switch + 2x10GE Uplinks | Broadcom
MPN: BCM53158XUB1KFBG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $92.64 | $92.64 |
| 10 | $78.74 | $787.40 |
| 100 | $56 | $5,600.00 |
| 500 | $42 | $21,000.00 |
| 1,000 | $35.12 | $35,120.00 |
BCM53158XUB1KFBG Overview
An Ethernet switch IC is a semiconductor device that interconnects several LAN segments at Layer 2 of the OSI model, forwarding Ethernet frames between ports using MAC address lookup tables. Modern highly-integrated switch ICs combine the PHYs, MACs, queueing engines, and CPU subsystem onto a single die, reducing BOM cost and PCB area for routers, gateways, and industrial Ethernet equipment. Within the taxonomy: Ethernet switch -> Layer-2 switch -> network IC -> wired networking semiconductor -> integrated circuit.
Key features include support for 8 GE downlink ports plus 2x10GE (or 2x5GE/2x2.5GE) flexible uplinks, IEEE 802.3az Energy-Efficient Ethernet, IPv4/IPv6 L2/L3/L4 ACL, QoS with eight queues per port, and integrated 8051-compatible management. It supports SPI, I2C, MII/GMII, and GPIO host interfaces for management, plus LED controllers for per-port link/activity indication. The device operates from a single 1.0V core supply with integrated voltage regulators, minimizing external component count.
The BCM53158XUB1KFBG is fabricated in a low-power CMOS process and uses power-gating on inactive PHYs to deliver sub-watt idle consumption. Its packet processor supports wire-speed forwarding on all GE ports plus line-rate 10GE uplinks, with hardware NAT and tunnel offload for gateway deployments. Built-in TCAM enables wire-speed ACL and QoS classification without CPU intervention.
Typical applications include SMB/SOHO routers, enterprise edge switches, xDSL/cable gateways, Wi-Fi 6/7 access points, industrial Ethernet switches, and small-cell backhaul. The 2x10GE uplinks enable aggregation into 10G core networks without an additional switch device. Design considerations include proper decoupling of the 1.0V core rail and thermal management of the high-ball-count BGA package in confined enclosures.
This page synthesizes distributor pricing snapshots, package diagrams, and design notes that complement the manufacturer datasheet for engineers evaluating the BCM53158XUB1KFBG.
Drop-in alternatives for BCM53158XUB1KFBG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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BCM53158XUB1KFBG-Q1
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BCM53158XA1KFBG
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BCM53158XUB1KFBG Maximum Ratings & Electrical Characteristics
| Product Type | 8-Port Gigabit Ethernet Layer-2 Switch with 10GE Uplinks |
| Family | Robo2 (BCM53154/BCM53156/BCM53158) |
| Downlink Ports | 8 x 10/100/1000 BASE-T/TX |
| Uplink Ports | 2 x 10GE (SGMII/XFI flexible) |
| Standards Compliance | IEEE 802.3, IEEE 802.3az (EEE) |
| Host Interfaces | GPIO, I2C, MII, SPI |
| QoS Queues per Port | 8 |
| ACL Support | IPv4/IPv6 L2/L3/L4 hardware ACL |
| CPU Subsystem | Integrated ARM-based management CPU |
| Core Voltage | 1.0 V (with integrated LDOs) |
| Silicon Revision | B1 |
| Grade | Commercial (U suffix) |
| RoHS Status | Compliant (per LCSC listing) |
BCM53158XUB1KFBG standard Pin Configuration Guide
Pin configuration for BCM53158XUB1KFBG (standard package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for BCM53158XUB1KFBG.
Refer to the datasheet for full pin configuration.
Typical Applications
BCM53158XUB1KFBG is suitable for 6 applications: SMB/SOHO Router and Gateway, Wi-Fi 6E/Wi-Fi 7 Access Point Aggregation Switch, Industrial Ethernet Switch, xDSL/Cable Modem Gateway, Enterprise Edge / SMB Aggregation Switch, Small-Cell Backhaul and 5G FWA.
SMB/SOHO Router and Gateway
The BCM53158XUB1KFBG's 8 GE ports plus 2x10GE uplinks make it a strong fit for SMB/SOHO routers that aggregate user traffic onto a 10G fiber uplink. The 4.17 uVrms-grade noise immunity of the integrated PHYs, combined with hardware NAT/ACL offload, allows low-cost gateway designs without compromising throughput. With I2C/sPI management interfaces, it pairs easily with Wi-Fi 6/7 SoCs and external CPU subsystems.
Recommended
Wi-Fi 6E/Wi-Fi 7 Access Point Aggregation Switch
In Wi-Fi 6E/7 access points and multi-AP routers, the BCM53158XUB1KFBG's 10GE uplinks deliver the bandwidth required for multi-gigabit wireless backhaul. Eight GE ports support downstream APs, mesh nodes, and user devices, while IEEE 802.3az Energy-Efficient Ethernet (EEE) reduces idle power consumption. The integrated ARM management CPU simplifies BOM by eliminating an external switch controller.
Recommended
Industrial Ethernet Switch
The BCM53158XUB1KFBG (Commercial 'U' grade) suits factory-floor Ethernet switches with moderate thermal environments, while the BCM53158XA1KFBG (Industrial grade) variant extends operation to harsher industrial temperatures. The hardware ACL and QoS engines deliver deterministic latency for PROFINET/EtherNet/IP traffic, while the integrated 8051 management interface simplifies field deployment. Robust surge protection on PHYs reduces external component count.
Recommended
xDSL/Cable Modem Gateway
For xDSL/cable modem gateways, the BCM53158XUB1KFBG's 8 GE LAN ports connect user devices while the 10GE uplinks feed the WAN aggregation switch. Hardware NAT offload and IPv6 transition mechanisms reduce CPU load on the host processor, enabling lower-cost gateway designs. The integrated LED controllers drive per-port link/activity indication without external logic.
Recommended
Enterprise Edge / SMB Aggregation Switch
Stacked or standalone SMB aggregation switches use the BCM53158XUB1KFBG to combine 8 GE user ports onto dual 10GE fiber uplinks, eliminating the need for a separate aggregation switch. Layer-2/L3/L4 ACL provides per-flow security policies at wire speed, while eight QoS queues per port enable voice/video/data prioritization. The single-chip integration reduces BOM and PCB complexity for cost-sensitive deployments.
Recommended
Small-Cell Backhaul and 5G FWA
Small-cell base stations and 5G fixed wireless access (FWA) gateways use the BCM53158XUB1KFBG for backhaul connectivity. The 2x10GE uplinks support link-aggregation (LAG) for redundancy and increased throughput to the core network. Hardware timestamping and TCAM enable accurate latency-sensitive traffic handling required by mobile backhaul standards.
Recommended
Recommended Products Summary
Engineering reference data for BCM53158XUB1KFBG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BCM53154XUB1KFBG | BCM53156XUB1KFBG | BCM53158XUB1KFBG-Q1 | BCM53158XA1KFBG |
|---|---|---|---|---|---|
| Package | BGA (Robo2 family) | BGA (same family) | BGA (same family) | BGA (same family) | BGA (same family) |
| Brand | Broadcom | Broadcom | Broadcom | Broadcom | Broadcom |
| GE Downlink Ports | 8 | 8 | 8 | 8 | 8 |
| 10GE Uplinks | 2x10GE (SGMII/XFI) | 2x10GE | Reduced | 2x10GE | 2x10GE |
| Temperature Grade | Commercial (U) | Commercial (U) | Commercial (U) | Automotive (Q1) | Industrial (A1) |
| Silicon Revision | B1 | B1 | B1 | B1 | B1 |
| AEC-Q100 Qualified | No | No | No | Yes | No |
Key Differentiators
- Dual 10GE uplinks in single chip (vs BCM53156XUB1KFBG)
- Commercial grade cost optimization (vs BCM53158XUB1KFBG-Q1)
- Integrated management CPU (vs Microchip KSZ9893RNXI)
Design Notes
The BCM53158XUB1KFBG operates from a single 1.0V core supply with integrated LDOs generating internal rails. Provide at least 4 bulk decoupling capacitors (10uF X7R) close to the BGA power balls, plus 0.1uF X7R high-frequency bypass on every supply pin. Estimated: a fully populated 8xGE + 2x10GE design may draw 3-5W under typical traffic; design the 1.0V regulator (such as AP63205WU-7) for 8A peak to handle port-activation inrush.
The high-ball-count BGA package concentrates heat at the die. Estimated: at 5W total dissipation in still conditions, a 4-layer PCB with continuous ground plane on layer 2 typically provides theta_JA of ~20 C/W. For enclosed gateway designs without airflow, ensure adequate copper thermal vias under the package center and consider thermal pad soldering to maximize heat transfer to the inner ground plane.
Route the 10GE SGMII/XFI uplink pairs with 100-ohm differential impedance and length matching within 5 mils to maintain signal integrity at 10.3125 Gbps. Keep GE PHY traces short and matched; for EMI compliance, place common-mode chokes on the RJ45 magnetics side, not on the PHY side. Use a continuous reference ground plane beneath all high-speed signals with no plane splits.
Do not assume the 'U' Commercial-grade variant will operate reliably in outdoor enclosures; select the BCM53158XA1KFBG (Industrial) variant for industrial deployments. Verify that the upstream 1.0V regulator can source the inrush during PHY initialization (up to 2A transient). Always reset stack trace and read the silicon revision register to confirm B1 stepping before deploying firmware that depends on B1 errata fixes.
Compliance Information
RoHS compliance per LCSC product listing (C6131385). The Commercial 'U' grade is not AEC-Q100 qualified; select the Q1 variant for automotive applications. REACH, halogen-free, and conflict minerals status are not stated in the verified web data and remain unknown.
