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HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversBCM5461A1KPFG
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BCM5461A1KPFG - Broadcom Limited

Manufacturer Part Number
BCM5461A1KPFG
Manufacturer
Avago Technologies (Broadcom)
Allelco Part Number
32D-BCM5461A1KPFG
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
9,920 pcs available, New & Original
Parts Description
10/100/1000BASE-T SINGLE
Package
Tray
Data sheet
BCM5461A1KPFG.pdf

PCN Obsolescence/ EOL

BCM5461x obs 15/Apr/2022.pdf

PCN Assembly/Origin

Mult Devices 10/Jul/2017.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 9920
  • Unit Price: $6.913
  • Subtotal: $0.00

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Add to Cart and Submit RFQ now, we'll contact you immediately.

Quantity Unit Price Ext. Price
1+ $6.913 $6.91
200+ $2.675 $535.00
500+ $2.581 $1,290.50
1000+ $2.535 $2,535.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

BCM5461A1KPFG Tech Specifications
Broadcom Limited - BCM5461A1KPFG technical specifications, attributes, parameters and parts with similar specifications to Broadcom Limited - BCM5461A1KPFG

Product Attribute Attribute Value
Manufacturer Avago Technologies (Broadcom)
Series *
Product Attribute Attribute Value
Package Tray
Base Product Number BCM5461

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN 5A991B1
HTSUS 8542.39.0001

Parts Introduction

Manufacturer Part Number

BCM5461A1KPFG

Manufacturer

Broadcom

Introduction

The BCM5461A1KPFG is a high-performance, low-power Gigabit Ethernet Transceiver chip designed for a wide range of network applications. It integrates a complete Gigabit Ethernet physical layer (PHY) solution, including a 10/100/1000 Mbps Ethernet MAC, an advanced digital signal processor (DSP), and an analog front-end (AFE) on a single chip.

Product Features and Performance

Supports 10/100/1000 Mbps Ethernet speeds

Integrated 10/100/1000 Mbps Ethernet MAC

Advanced DSP-based equalization and timing recovery

Analog front-end with high-performance ADCs and DACs

Low power consumption with advanced power management features

Comprehensive on-chip diagnostic and status monitoring capabilities

Product Advantages

Highly integrated solution reducing board space and component count

Robust performance with advanced signal processing algorithms

Flexible power management for optimized energy efficiency

Comprehensive diagnostic and monitoring capabilities for improved system reliability

Key Reasons to Choose This Product

Industry-leading Gigabit Ethernet performance in a compact package

Proven reliability and quality from a trusted semiconductor manufacturer

Optimized for low-power applications with advanced power management

Comprehensive set of features and capabilities for a wide range of network designs

Quality and Safety Features

Rigorous quality control and testing procedures

Compliance with industry standards and regulations

Robust design for reliable operation in diverse environments

Compatibility

The BCM5461A1KPFG is compatible with a wide range of networking equipment and systems that require Gigabit Ethernet connectivity.

Application Areas

Ethernet-enabled consumer electronics

Industrial automation and control systems

Networking equipment such as routers, switches, and access points

Embedded systems and IoT devices

Product Lifecycle

The BCM5461A1KPFG is an obsolete product, meaning it is no longer in active production. However, there may be equivalent or alternative models available from Broadcom or other manufacturers. Customers are advised to contact our website's sales team for more information on current product offerings and availability.

Frequently Asked Questions(FAQ)

How does the BCM5461A1KPFG handle electromagnetic interference in industrial Ethernet applications, and what design considerations are necessary to maintain signal integrity?
The BCM5461A1KPFG incorporates advanced analog front-end circuitry with built-in echo cancellation and adaptive equalization to mitigate electromagnetic interference (EMI) on 10/100/1000BASE-T links. In high-noise environments such as industrial automation systems, proper PCB layout practices—including controlled impedance traces for differential pairs, adequate grounding planes, and isolation of high-speed signals from switching regulators—are essential. Additionally, the use of common-mode chokes and ferrite beads near magnetics can further suppress conducted emissions. Designers should also ensure that the PHY’s power supply exhibits low ripple (<50 mVpp) to prevent jitter accumulation in the serializer/deserializer circuits.
What are the thermal implications of continuous operation for the BCM5461A1KPFG, and how do they affect long-term reliability in compact form factors?
Operating the BCM5461A1KPFG continuously at maximum data rates generates approximately 1.8 W of internal dissipation under typical 3.3 V supply conditions. While the device is rated for -40°C to +85°C junction temperature, sustained thermal buildup in densely populated PCBs may require careful heat dissipation planning. In small form-factor designs, natural convection alone may be insufficient; therefore, thermal vias beneath the exposed pad and proximity to copper pours can improve board-level cooling. Long-term reliability is maintained provided the case temperature remains below 70°C, aligning with JEDEC JESD22-A104 stress testing profiles.
Can the BCM5461A1KPFG interoperate with legacy Fast Ethernet devices without performance degradation, and what auto-negotiation behaviors must be accounted for?
Yes, the BCM5461A1KPFG supports full IEEE 802.3u and 802.3ab compliance, enabling seamless backward compatibility with 10BASE-T and 100BASE-TX endpoints. During auto-negotiation, it prioritizes the highest mutually supported speed and duplex mode, though link stability may degrade if legacy devices exhibit non-standard pulse amplitude or timing characteristics. Designers should validate link training sequences using TDR analysis to confirm channel quality before finalizing deployment, especially when mixing modern Gigabit-capable nodes with older switches lacking proper 1000BASE-T support.
How does the BCM5461A1KPFG compare to the BCM54216EB1KMLG in terms of power efficiency and multi-port scalability?
The BCM5461A1KPFG is a single-port Gigabit PHY optimized for cost-sensitive applications requiring 10/100/1000BASE-T functionality, consuming around 1.2 W active power. In contrast, the BCM54216EB1KMLG integrates six independent PHY channels with enhanced energy detection capabilities, reducing per-port power consumption to approximately 0.9 W at Gigabit rates due to shared clocking and management logic. For systems requiring multiple ports, the BCM54216EB1KMLG offers superior scalability and lower overall BOM cost, while the BCM5461A1KPFG remains preferable for space-constrained single-link designs where port count is fixed.
What precautions should be taken when routing the MDI/MDIX interface of the BCM5461A1KPFG to minimize crosstalk and insertion loss?
To preserve signal integrity across the BCM5461A1KPFG’s MDI/MDIX interface, maintain consistent differential pair lengths within ±5 mils and keep trace spacing greater than three times the trace width between adjacent pairs. Controlled-impedance routing (typically 100 Ω differential) over microstrip or stripline configurations is mandatory. Avoid vias whenever possible; if unavoidable, use via stub minimization techniques such as back-drilling. Termination resistors should be placed as close as possible to the connector or magnetics to dampen reflections, particularly at Gigabit speeds where symbol durations approach 0.4 ns.
Is the BCM5461A1KPFG suitable for automotive Ethernet applications, given its RoHS3 compliance and environmental ratings?
Although the BCM5461A1KPFG meets RoHS3 standards and operates over an industrial temperature range (-40°C to +85°C), it lacks AEC-Q100 qualification and is not designed for functional safety or extended automotive-grade reliability requirements. Its Moisture Sensitivity Level (MSL) of 3 indicates moderate susceptibility to humidity during assembly, which may pose risks in harsh automotive environments without conformal coating. Therefore, while usable in non-safety-critical infotainment systems with stringent thermal management, it is not recommended for primary communication buses or mission-critical control domains without additional derating and environmental shielding.
How does the BCM5461A1KPFG support Energy Efficient Ethernet (EEE) according to IEEE 802.3az, and what are the practical impacts on latency-sensitive traffic?
The BCM5461A1KPFG implements IEEE 802.3az-compliant EEE features that allow the transmitter and receiver to enter low-power idle states during periods of low data activity, reducing average power consumption by up to 30% in bursty traffic scenarios. However, transitioning between active and low-power modes introduces a wake-up latency of approximately 3–5 μs, which can disrupt real-time protocols like EtherCAT or PROFINET IRT. Designers must assess whether EEE benefits outweigh potential jitter penalties by analyzing worst-case packet inter-arrival times and ensuring sufficient buffer capacity at endpoints to absorb temporary delays during mode transitions.
What configuration registers are critical for optimizing the BCM5461A1KPFG’s receive equalizer settings under varying cable lengths and conditions?
Key registers for tuning the BCM5461A1KPFG’s adaptive equalizer include the Receive Equalizer Gain Control (address 0x14, bits 6:4) and the Decision Feedback Equalizer (DFE) tap weights (addresses 0x1A–0x1C). For cables exceeding 100 meters with excessive skew or attenuation, increasing the pre-emphasis level via the Transmitter Pre-cursor Control (0x13, bit 5) can compensate for high-frequency loss. Automatic gain control (AGC) thresholds in register 0x0F should be monitored during link training to avoid false carrier detection. Field calibration using time-domain reflectometry (TDR) feedback can further refine these settings for specific cabling infrastructures.
Does the BCM5461A1KPFG support loopback modes for diagnostic purposes, and how can they be leveraged during system bring-up?
Yes, the BCM5461A1KPFG provides several loopback configurations: serial loopback (for register diagnostics), parallel loopback (for MAC-PHY loop testing), and digital impairment insertion. Enabling loopback via Management Data Input/Output (MDIO) commands allows isolation of faults in external magnetics or connectors without requiring physical disconnection. During bring-up, serial loopback can verify MDIO communication integrity, while parallel loopback tests the internal SerDes and analog frontend under closed-loop conditions. Caution must be exercised—prolonged loopback operation increases power and thermal load, so it should be limited to brief validation phases.
How does the BCM5461A1KPFG handle fault signaling and link state changes, and what mechanisms exist for host microcontroller monitoring?
The BCM5461A1KPFG asserts standard interrupt signals—Link Status, Duplex Mode, Speed Change, and Jabber—on its GPIO pin when connected to a microcontroller via MDIO. These events are debounced internally to filter transient noise but can be masked or enabled through the Interrupt Mask Register (0x16). Additionally, the Extended Page 1 Registers provide detailed status information such as RX/TX error counters and cable length estimation. Real-time monitoring enables predictive maintenance and rapid troubleshooting, particularly useful in remote industrial nodes where physical access is limited.
What are the recommended decoupling capacitor values and placement guidelines for stable operation of the BCM5461A1KPFG?
Stable operation requires a combination of bulk and high-frequency decoupling: a 10 μF tantalum or ceramic capacitor placed within 5 mm of the VDD pins for bulk filtering, supplemented by four 0.1 μF X7R/X5R capacitors (one per power rail) positioned as close as possible to each supply pin. Each capacitor should have minimal parasitic inductance, achieved through short, wide traces and avoidance of vias. Ferrite bead filtering may be added selectively on noisy supplies if EMI certification is required, but excessive filtering can impede transient response during fast data rate switching.
Can the BCM5461A1KPFG operate reliably over extended cable runs beyond 100 meters, and what performance trade-offs emerge?
The BCM5461A1KPFG complies with IEEE 802.3ab specifications for up to 100 meters over Category 5e or better cabling. Beyond this distance, insertion loss increases significantly, degrading SNR and triggering frequent retraining cycles. At 120 meters, successful operation depends heavily on cable quality—lower-twist-pair cables exhibit higher crosstalk and attenuation. Even with advanced equalization, bit error rates may rise above 10⁻¹², compromising reliability. In such cases, signal regeneration or media conversion becomes necessary rather than relying solely on PHY-level compensation.
How does the BCM5461A1KPFG interact with integrated magnetics modules, and what design rules apply to impedance matching?
The BCM5461A1KPFG interfaces directly with integrated magnetics modules compliant with IEEE 802.3 standards, which provide common-mode choke and isolation transformer functions. Critical design rules include maintaining consistent 100 Ω differential impedance across the entire path—from PHY output to magnetic center-tap—and ensuring symmetrical return paths. Center taps must be biased at VDD/2 via a precision resistor divider to maintain common-mode voltage stability. Poor biasing causes saturation in the transformer core, leading to harmonic distortion and reduced reach. Always consult the magnetic vendor’s layout recommendations for optimal coupling and EMI performance.
What impact does supply noise have on the BCM5461A1KPFG’s jitter performance, and how can it be quantified during prototype validation?
Supply noise exceeding 100 mVpp RMS on the 3.3 V rail directly couples into the SerDes PLL, increasing deterministic jitter by up to 0.15 UI (Unit Interval) at Gigabit rates. This manifests as increased eye closure in oscilloscope measurements and higher BER in stress testing. During validation, use a spectrum analyzer or jitter analyzer to correlate power supply ripple spectral density with measured TJ/RJ components. Implementing LC filters or LDO regulators with <10 mV ripple ensures jitter stays below 0.05 UI, meeting IEEE 802.3 requirements even under worst-case loading conditions.
Is the BCM5461A1KPFG compatible with 1000BASE-X fiber optics, and what adaptation layers are required?
No, the BCM5461A1KPFG is strictly a copper-based PHY supporting 10/100/1000BASE-T over twisted-pair media. It cannot interface directly with optical transceivers. To connect to fiber, a media converter module or separate fiber PHY (such as a SERDES-based device) must bridge the electrical interface. The BCM5461A1KPFG communicates only over MDI/MDIX pins and expects balanced differential signals; any fiber integration requires protocol translation at the physical layer, adding latency and complexity compared to native copper deployments.
How does the BCM5461A1KPFG support managed vs. unmanaged switch architectures, and what configuration flexibility does it offer?
The BCM5461A1KPFG is designed for managed switch applications where full control over MAC-PHY interaction is needed via MDIO. It exposes extensive diagnostic and tuning registers unavailable in simpler PHYs. In unmanaged designs, basic auto-negotiation and link training still function, but advanced features like loopback, energy detection, or custom equalization settings become inaccessible. For cost-driven unmanaged switches, consider alternative single-port PHYs with fewer programmable parameters, though the BCM5461A1KPFG remains viable if future upgradability or diagnostics are anticipated.
What role does the BCM5461A1KPFG play in Power over Ethernet (PoE) implementations, and are there any compatibility concerns?
The BCM5461A1KPFG itself does not handle PoE rectification or classification but operates downstream of PoE midspan equipment or PDs compliant with IEEE 802.3af/at. As long as the 3.3 V supply remains stable under 44–57 V input transients (typical of PoE+), the PHY functions normally. However, improper grounding between PoE sources and end devices can introduce ground loops or common-mode surges that stress the PHY’s ESD protection diodes. Isolate PoE return paths from sensitive analog sections using opto-isolators or isolated DC-DC converters if galvanic separation is required for safety or noise immunity.
How does the BCM5461A1KPFG’s internal oscillator tolerance affect clock recovery accuracy across different temperature and supply variations?
The BCM5461A1KPFG uses an internal RC oscillator calibrated during factory trimming, with a typical frequency tolerance of ±200 ppm over the industrial temperature range. While sufficient for most Ethernet applications, this drift can accumulate with supply voltage fluctuations (±5%) and temperature extremes, potentially causing minor desynchronization in strict TDMA systems. Most modern receivers compensate via elastic buffers, but cumulative phase error over long chains may require disciplined synchronization protocols. For ultra-low-jitter requirements, external crystal references (if available in derivative parts) provide superior stability at the cost of board area and BOM complexity.

Parts with Similar Specifications

The three parts on the right have similar specifications to Broadcom Limited BCM5461A1KPFG

Product Attribute BCM5461SA1KPFG BCM5461A1KFBG BCM5461SA1IPFG BCM5461SA1IPF
Part Number BCM5461SA1KPFG BCM5461A1KFBG BCM5461SA1IPFG BCM5461SA1IPF
Manufacturer Broadcom Limited Broadcom Limited Broadcom Limited Broadcom Limited
Base Product Number - DAC34H84 MAX500 ADS62P42
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Series - - - -

BCM5461A1KPFG Datasheet PDF

Download BCM5461A1KPFG pdf datasheets and Broadcom Limited documentation for BCM5461A1KPFG - Broadcom Limited.

Datasheets
BCM5461 Product Brief.pdf
PCN Obsolescence/ EOL
BCM5461x obs 15/Apr/2022.pdf
PCN Assembly/Origin
Mult Devices 10/Jul/2017.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

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Broadcom Limited

BCM5461A1KPFG

Broadcom Limited
32D-BCM5461A1KPFG

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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