2pcs Barrel Jack 5.5mm x 2.5mm

🔹 2PCS DC Power Barrel Jack – 5.5mm x 2.5mm (PCB Mount)

Standard 5.5mm outer diameter / 2.5mm inner diameter DC power jack connectors, designed for direct mounting onto printed circuit boards (PCBs). This slightly less common size provides a secure, low-profile connection for devices requiring a compact power interface compatible with specific wall adapters and power supplies.

✅ Specifications:

• Connector Type: DC Power Barrel Jack (Receptacle)

• Mounting Style: PCB Mount (Through-Hole, THT)

• Outer Sleeve Diameter (Sleeve): 5.5mm

• Inner Pin Diameter (Tip): 2.5mm

• Center Polarity: Typically Center Positive (+) (Always verify specific product listing)

• Terminal Pins: Usually 3 through-hole pins

• Standard Pinout (3-pin, bottom view):

  1. Center Pin / Tip Contact (Positive, if center positive)

  2. Outer Sleeve Contact (Negative/Ground)

  3. Normally Closed (NC) Switch Contact (Disconnects when plug is inserted)

• PCB Hole Spacing: Standard pin spacing (e.g., 3.5mm or 5.0mm between pins, check datasheet)

• Rated Voltage/Current: ~12V DC, 1A-3A (typical for standard PCB jacks)

• Material: Nickel-plated brass contacts, plastic housing

• Quantity: 2 pieces

⚙️ Features:

• PCB Integrated Design: Saves space and provides a robust, soldered connection directly to your circuit board.

• Specific Size Compatibility: Matches less common but widely available DC power plugs (often used in security cameras, some routers, and specialty equipment).

• Optional Switching Function: The third pin allows for automatic power source switching (e.g., between battery and external adapter).

• Secure Mechanical Mount: Plastic housing and multiple pins provide stability when a plug is inserted/removed.

• Cost-Effective & Reliable: Standard solution for adding a dedicated DC power input.

📦 Typical Applications:

• Custom PCB & Consumer Electronics: Power input for devices using 2.5mm plug adapters (e.g., certain brands of security cameras, audio equipment).

• Development & Prototype Boards: For products designed around a specific power supply with a 2.5mm plug.

• Battery-Powered Devices with Charging: Enables automatic switchover from battery to wall power when plugged in (using the NC pin).

• Replacement & Repair: Direct replacement for damaged jacks in existing equipment that uses this size.

• LED Lighting & Low-Power Devices: Where a specific, slightly larger plug is preferred for durability.

🔧 PCB Layout & Wiring Guide:

1. Footprint is Critical: Use the exact manufacturer-recommended footprint (pad size, hole diameter, and pin spacing) in your PCB design. Do not assume it matches the 2.1mm jack footprint.

2. Standard 3-Pin Connection (Center Positive):

   • Pin 1 (Center/Tip): Connect to your board’s VCC/V+ rail.

   • Pin 2 (Sleeve): Connect to your board’s GND plane.

   • Pin 3 (NC Switch): Connect to the positive side of a battery. When a plug is inserted, this connection opens, disconnecting the battery.

3. If No Battery: You can leave Pin 3 (NC) unconnected or tie it to Pin 1.

4. Polarity Protection: It is highly recommended to add a series diode or P-channel MOSFET for reverse polarity protection on the input.

5. Mechanical Stress: Ensure the PCB is supported near the jack if it will experience plug insertion/removal force.

⚠️ Critical Safety & Design Notes:

• CONFIRM SIZE & POLARITY: Before soldering, physically verify the jack size (2.5mm) and test its polarity with a multimeter. Match it precisely to your power supply’s plug.

• Do Not Mix with 2.1mm: A 2.1mm plug will fit loosely in a 2.5mm jack, causing an intermittent connection. A 2.5mm plug will not fit into a 2.1mm jack.

• Current Limit: Standard PCB jacks are often rated for 1A to 3A continuous. Verify the rating for your specific part.

• Input Protection: Always include at least a fuse or polyfuse and a protection diode on the power input line.