HR911105A RJ45 Magnetic Connector For 10/100Base-T NIC Applications

Mechanical and Electrical Specifications

HANRUN HR911105A Datasheet

Installation and Maintenance for RJ45 Magjacks

1. Mounting: Insert the connector into the through-hole pads on the PCB and solder all pins to ensure a solid connection.
2. Grounding: Ensure proper grounding through the metal shield tabs to minimize EMI and maintain signal quality.
3. Cleaning: Avoid exposure to flux residues or moisture; use isopropyl alcohol for cleaning after soldering.
4. Inspection: Verify solder joints and LED functionality before integrating into the system.

FAQs

1. What is the HANRUN HR911105A connector used for?

The HR911105A is a single-port RJ45 connector with integrated magnetics, designed for 10/100Base-T Ethernet applications. It is widely used in embedded systems, network interface cards (NICs), routers, switches, and industrial controllers to provide reliable Ethernet connectivity and electrical isolation.

2. What are the main features of HR911105A compared with standard RJ45 jacks?

Unlike standard RJ45 connectors, the HR911105A includes:

• Built-in magnetics for signal coupling and EMI suppression
• 1500 Vrms isolation voltage between PHY and cable side
• Dual LED indicators (Link/Activity)
• Integrated shielding for noise reduction integration reduces component count and simplifies PCB layout, making it ideal for compact Ethernet modules.

3. What is the electrical isolation rating of HR911105A?

The connector provides 1500 Vrms minimum isolation voltage between the cable side and the internal transformer circuit, meeting IEEE 802.3 Ethernet safety and EMC standards.

4. What are the mechanical dimensions of HR911105A?

Approximate dimensions:

• Length: 21.30 mm
• Width: 16.04 mm
• Height: 13.50 mm
• Mounting Type: Through-hole (side-entry)

5. How can I ensure correct grounding and EMI suppression when using HR911105A?

To achieve optimal EMI performance:

• Connect the metal shield tabs to chassis ground.
• Ensure a solid ground plane under the connector area.
• Keep high-speed signal traces short and impedance-controlled.
• Use proper chassis grounding capacitors (e.g., 1000 pF) if needed.

6. Is the HR911105A RoHS compliant?

Yes, the HR911105A is RoHS-compliant and manufactured with lead-free materials, suitable for environmentally friendly production processes.

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