Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395265007 Woodhead - Molex	TERM BLOCK HDR 7POS 90DEG 5MM	900
0395220006 Woodhead - Molex	TERM BLOCK HDR 6POS 90DEG 5MM	1286
0395126008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 3.81MM	2302
0395037005 Woodhead - Molex	TERM BLOCK PLUG 5POS 3.5MM	1509
0395211002 Woodhead - Molex	TERM BLOCK HDR 2POS VERT 5MM	0
0395315010 Woodhead - Molex	TERM BLOCK HDR 10POS VERT 5.08MM	900
0395355002 Woodhead - Molex	TERM BLOCK HDR 2POS VERT 5.08MM	4320
0395077002 Woodhead - Molex	TERM BLOCK PLUG 2POS 3.5MM	3000
0395338003 Woodhead - Molex	TERM BLOCK PLUG 3POS 5.08MM	580
0395026004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 3.5MM	3917
0395137010 Woodhead - Molex	TERM BLOCK PLUG 10POS 3.81MM	366
0395200010 Woodhead - Molex	TERM BLOCK PLUG 10POS STR 5MM	226
0395245007 Woodhead - Molex	TERM BLOCK PLUG 7POS STR 5MM	432
0395321012 Woodhead - Molex	TERM BLOCK HDR 12POS 5.08MM	140
0395237010 Woodhead - Molex	TERM BLOCK PLUG 10POS 270DEG 5MM	403
0395350006 Woodhead - Molex	TERM BLOCK HDR 6POS VERT 5.08MM	626
0395178010 Woodhead - Molex	TERM BLOCK PLUG 10POS 3.81MM	540
0395016003 Woodhead - Molex	TERM BLOCK HDR 3POS VERT 3.5MM	2321
0395077003 Woodhead - Molex	TERM BLOCK PLUG 3POS 3.5MM	1260
0395333002 Woodhead - Molex	TERM BLOCK PLUG 2POS 5.08MM	1361

Terminal Blocks - Headers, Plugs and Sockets

1. Overview

Terminal blocks, headers, plugs, and sockets are essential components in electrical and electronic systems for establishing reliable connections between circuits. These devices enable signal transmission, power distribution, and system modularity. Their standardized designs ensure interoperability, scalability, and ease of maintenance in complex systems.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Terminal Blocks	Screw/clamp-based connections for high current/ voltage	Industrial control panels, power distribution units
PCB Headers	Pin/grid arrays for board-to-board connections	Embedded systems, Arduino shields
RJ Connectors	Modular jacks for data/telecom signals	Ethernet networks (RJ45), telephone systems (RJ11)
D-Sub Connectors	Multi-pin trapezoidal shells for analog/digital signals	Legacy serial interfaces, industrial sensors
USB Connectors	Hot-pluggable interfaces for power/data	Consumer electronics, peripheral devices

3. Structure and Components

Typical structures include:

Insulating housing (PA66, PBT, or LCP plastics)
Contact elements (phosphor bronze, beryllium copper)
Plating materials (gold, tin, nickel for corrosion resistance)
Actuation mechanisms (screws, spring clamps, or friction fits)
EMI shielding layers (for high-frequency applications)

4. Key Technical Specifications

Parameter	Importance
Current Rating (A)	Determines power handling capacity
Voltage Rating (V)	Defines dielectric strength requirements
Contact Resistance (m )	Impacts signal integrity and power loss
Insertion Loss (dB)	Critical for high-speed data transmission
Mating Cycles	Indicates mechanical durability
Operating Temperature (- C to + C)	Defines environmental tolerance

5. Application Fields

Primary industries include:

Industrial automation (PLCs, HMIs)
Telecommunications (5G base stations, routers)
Consumer electronics (smartphones, wearables)
Medical equipment (imaging devices, patient monitors)
Automotive (EV charging systems, ADAS)

6. Leading Manufacturers and Products

Manufacturer	Representative Product
Phoenix Contact	COMBICON series terminal blocks
TE Connectivity	MICRO MATCH connectors
Molex	SL Series headers
Amphenol	D-Subminiature connectors
Samtec	QTE high-speed socket systems

7. Selection Guidelines

Key considerations:

Electrical requirements (current/voltage levels)
Mechanical constraints (space, vibration)
Environmental factors (temperature, humidity)
Signal integrity needs (frequency, noise rejection)
Cost vs. reliability trade-offs
Compliance with standards (IPC, IEC, UL)

8. Industry Trends

Emerging developments include:

Miniaturization for wearable devices
High-speed connectors for 5G/6G ( 25 Gbps)
Hybrid connectors integrating power/data
Eco-friendly materials (halogen-free, RoHS compliant)
Smart connectors with built-in sensors
Automotive-grade connectors for EVs