BCM54240C1KFBG

BCM54240C1KFBG is Broadcom’s 4-port Gigabit Ethernet switch/controller designed for embedded networking gear. It provides four 10/100/1000BASE-T PHYs with an internal switch fabric, enabling a small, single-chip Ethernet switch for devices like routers, gateways, switches, or networked storage.
Key features (high level):
- 4 x RJ-45 ports with auto-negotiation and back-to-back operation at 10/100/1000 Mbps
- Internal L2 switch fabric with store-and-forward operation
- Standard Ethernet features: VLAN (802.1Q), QoS/traffic shaping, jumbo frames
- Management via MDIO/MDC for PHY configuration and status
- Suitable for embedded hosts in consumer/SMB networking equipment
Packaging/interface:
- C1KFBG indicates a specific revision/package variant; exact pinout, host interface, and power rails are defined in the Broadcom datasheet (often NDA-limited).
Applications:
- Home/office gateways, small business switches, embedded networking appliances.
For precise electrical, timing, and programming details, consult the BCM54240C1 data sheet from Broadcom.

Here are the typical features of the BCM54240C1KFBG:
- Quad Gigabit Ethernet MAC/PHY cores: four independent 10/100/1000BASE-T ports
- Host interface: PCIe (x1) for connection to CPU/host
- Full/half duplex operation with auto-negotiation and IEEE 802.3x flow control
- Jumbo frame support (up to ~9 KB)
- VLAN support (802.1Q) and basic QoS capabilities
- Checksum offloads and other DMA/IP offloads for TCP/IP traffic
- MDIO/MDC PHY management interface
- Large DMA descriptor rings and efficient DMA engine for high performance
- Per-port status/LED indicators
- Power management and low-power/standby modes (Wake-on-LAN where supported)
- Typical embedded/SOC integration footprint with RoHS-compliant packaging
Note: exact feature set and supported options can vary by revision/package; consult the official datasheet for precise specs and host-interface details.

FBGA — Fine-pitch Ball Grid Array (40-ball package) for BCM54240C1KFBG.

Pin count: 196-pin Fine-Pitch BGA (KFBG package).
Function: Broadcom BCM54240C1KFBG is a quad-port Ethernet PHY (4 x 10/100/1000BASE-T) with MDIO/MDC management interface; provides the physical layer for four Ethernet ports (no onboard MAC).

Manufacturer: Broadcom Inc.
What kind of company: Broadcom is a global semiconductor company (fabless) that designs and sells a wide range of chips and infrastructure software for networking, broadband, wireless, storage, and data center applications. It outsources manufacturing to foundries.

BCM54240C1KFBG is a quad-port 10/100/1000BASE-T Ethernet PHY. Applications include NICs and embedded Ethernet controllers, multi-port switches/routers and network appliances, industrial Ethernet equipment and automation gear, and IP cameras/video servers that require several copper Ethernet ports.

Direct public equivalents for BCM54240C1KFBG aren’t listed. It’s a Broadcom 4-port 10/100/1000BASE-T Ethernet PHY (FBGA). For a drop-in, look for other Broadcom BCM5424x/BCM54xx 4-port PHYs with the same interface and package. Otherwise use Broadcom’s cross-reference tool or a distributor (Digi‑Key/Mouser) with your constraints (ports, interface, LEDs, package). Non-Broadcom substitutes depend on interface/footprint; there is no universal pin‑to‑pin equivalent.