Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395126002 Woodhead - Molex	TERM BLOCK HDR 2POS 90DEG 3.81MM	3778
0395000014 Woodhead - Molex	TERM BLOCK PLUG 14POS STR 3.5MM	301
0395340004 Woodhead - Molex	TERM BLOCK PLUG 4POS STR 5.08MM	436
0395077005 Woodhead - Molex	TERM BLOCK PLUG 5POS 3.5MM	1728
0395311003 Woodhead - Molex	TERM BLOCK HDR 3POS VERT 5.08MM	2979
0395337004 Woodhead - Molex	TERM BLOCK PLUG 4POS 5.08MM	642
0395200006 Woodhead - Molex	TERM BLOCK PLUG 6POS STR 5MM	302
0395325004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 5.08MM	2157
0395037002 Woodhead - Molex	TERM BLOCK PLUG 2POS 3.5MM	37
0395226002 Woodhead - Molex	TERM BLOCK HDR 2POS 90DEG 5MM	2382
0395077006 Woodhead - Molex	TERM BLOCK PLUG 6POS 3.5MM	1294
0395310008 Woodhead - Molex	TERM BLOCK HDR 8POS VERT 5.08MM	88
0395325012 Woodhead - Molex	TERM BLOCK HDR 12POS 5.08MM	720
0395033007 Woodhead - Molex	TERM BLOCK PLUG 7POS 90DEG 3.5MM	574
0395200007 Woodhead - Molex	TERM BLOCK PLUG 7POS STR 5MM	544
0395005003 Woodhead - Molex	TERM BLOCK PLUG 3POS STR 3.5MM	555
0395038002 Woodhead - Molex	TERM BLOCK PLUG 2POS 90DEG 3.5MM	1937
0395300109 Woodhead - Molex	TERM BLOCK PLUG 9POS STR 5.08MM	509
0395056002 Woodhead - Molex	TERM BLOCK HDR 2POS VERT 3.5MM	3536
0395305108 Woodhead - Molex	TERM BLOCK PLUG 8POS STR 5.08MM	379

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