MAC Controller Component for Network Interface Cards

Product Specifications

Technical details and manufacturing context for MAC (Media Access Control) Controller

Definition

The MAC Controller is a critical integrated circuit or logic block embedded within a Network Interface Controller (NIC). Its primary role is to implement the Media Access Control sublayer of the data link layer (Layer 2) in the OSI model. It is responsible for framing data into packets (adding source/destination MAC addresses, error checking via CRC), controlling access to the shared physical transmission medium (e.g., using CSMA/CD for Ethernet), handling flow control, and managing the physical signaling interface (PHY). It acts as the intermediary between the higher-level network protocols and the physical network hardware. The MAC Controller operates by receiving data packets from the host system via a bus interface (e.g., PCIe). It encapsulates this data into frames with a defined header (containing source and destination MAC addresses) and trailer (Frame Check Sequence). It then manages the timing for transmitting these frames onto the network medium, adhering to the specific access control method (like contention-based for Ethernet). On reception, it listens to the medium, validates incoming frames by checking the destination MAC address and CRC, strips the frame headers, and passes the payload data to the host system. It often includes buffers (FIFOs) to manage data flow and may implement features like VLAN tagging, priority queuing, and power management. The device is fabricated on silicon semiconductor material. Typical parameters include data rates of 10/100/1000 Mbps with auto-negotiation, interface types such as MII/RMII/GMII/RGMII, operating voltage of 3.3 V ±5%, industrial temperature range of -40 to 85 °C, power consumption of 0.5–1.5 W, packet buffer size of 16–64 KB, MAC address table size of 1024–8192 entries, frame size of 64–1522 bytes (jumbo frames up to 9K optional), latency ≤10 µs, ESD protection ±2 kV (HBM), package types QFN-48/QFP-64, and operating humidity of 10–90% RH. These values are reference ranges; verify model-specific specifications with the manufacturer.

Working Principle

The MAC Controller receives data packets from the host via a bus interface, encapsulates them into frames with MAC addresses and CRC, and manages transmission timing on the network medium using access control methods like CSMA/CD. On reception, it validates frames by checking destination address and CRC, strips headers, and passes payload to the host. It uses FIFO buffers for flow management and may support VLAN tagging and priority queuing.

Common Materials

Silicon (Semiconductor)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Data Rate	10/100/1000 Mbps	Auto-negotiation supportedIEEE 802.3
Interface Type	MII/RMII/GMII/RGMII	Selectable per designIEEE 802.3
Operating Voltage	3.3 ±5% V	Core and I/O
Operating Temperature	-40–85 °C	Industrial gradeIEC 60068-2-1/2
Power Consumption	0.5–1.5 W	At full load
Packet Buffer Size	16–64 KB	Per port
MAC Address Table Size	1024–8192 entries	For switching
Frame Size	64–1522 bytes	Jumbo frames up to 9K optionalIEEE 802.3
Latency	≤10 µs	Store-and-forward
ESD Protection	±2 kV	HBMIEC 61000-4-2
Package Type	QFN-48/QFP-64	RoHS compliantJEDEC
Operating Humidity	10–90 % RH	Non-condensingIEC 60068-2-78

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Transmit FIFO Buffer Part
Temporarily stores data frames from the host before they are processed and transmitted onto the network medium, managing data flow.

Material: semiconductor_memory
Receive FIFO Buffer
Temporarily stores incoming data frames from the network before they are processed and sent to the host system.

Material: semiconductor_memory
CRC Generator/Checker
Calculates the Cyclic Redundancy Check value for outgoing frames (generator) and verifies it for incoming frames (checker) to ensure data integrity.

Material: logic_circuits
MAC Address Register Part
Stores the unique hardware (MAC) address assigned to the controller, used in frame headers.

Material: non_volatile_memory
Media Access State Machine Part
The core logic that implements the specific media access protocol (e.g., CSMA/CD for Ethernet) to control when the controller can transmit data.

Material: logic_circuits

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for MAC (Media Access Control) Controller.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Network Interface Controller(s)

View system integration details

Manufacturers of MAC (Media Access Control) Controller

Manufacturer profiles associated with MAC (Media Access Control) Controller.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the role of a MAC Controller in a network interface?

The MAC Controller implements the Media Access Control sublayer of the data link layer. It handles framing, error checking, and access control to the physical medium, acting as an intermediary between the host and the PHY.

What are typical data rates supported by this MAC Controller?

The listed data rates are 10/100/1000 Mbps with auto-negotiation, per IEEE 802.3. These are reference values; confirm the specific model's capabilities with the manufacturer.

Which interface types are available?

Interface types include MII, RMII, GMII, and RGMII, as per IEEE 802.3. The exact interface depends on the design and must be verified for the specific part.

What are the operating temperature and humidity ranges?

The operating temperature range is -40 to 85 °C (industrial grade) and humidity is 10–90% RH (non-condensing). These are reference ranges; check the datasheet for exact limits.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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voltage:	3.3V ±5% or 1.8V ±5% depending on interface
data rate:	10/100/1000 Mbps (Gigabit), 10/100 Mbps (Fast Ethernet)
temperature:	0°C to 70°C (commercial), -40°C to 85°C (industrial)
clock frequency:	Up to 250 MHz for Gigabit Ethernet, 125 MHz for Fast Ethernet

MAC (Media Access Control) Controller

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards