Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395305120 Woodhead - Molex	TERM BLOCK PLUG 20POS STR 5.08MM	180
0395210002 Woodhead - Molex	TERM BLOCK HDR 2POS VERT 5MM	2373
0395305112 Woodhead - Molex	TERM BLOCK PLUG 12POS STR 5.08MM	469
0395365011 Woodhead - Molex	TERM BLOCK HDR 11POS 5.08MM	590
0395011018 Woodhead - Molex	TERM BLOCK HDR 18POS VERT 3.5MM	0
0395378012 Woodhead - Molex	TERM BLOCK PLUG 12POS 5.08MM	360
0395045009 Woodhead - Molex	TERM BLOCK PLUG 9POS STR 3.5MM	1013
0393730005 Woodhead - Molex	TERM BLOCK HDR 5POS 90DEG 7.5MM	440
0395116004 Woodhead - Molex	TERM BLOCK HDR 4POS VERT 3.81MM	4708
0395156003 Woodhead - Molex	TERM BLOCK HDR 3POS VERT 3.81MM	27472880
0395205006 Woodhead - Molex	TERM BLOCK PLUG 6POS STR 5MM	683
0395078006 Woodhead - Molex	TERM BLOCK PLUG 6POS 90DEG 3.5MM	1286
0395332003 Woodhead - Molex	TERM BLOCK PLUG 3POS 5.08MM	1177
0395078011 Woodhead - Molex	TERM BLOCK PLUG 11POS 3.5MM	504
0395305010 Woodhead - Molex	TERM BLOCK PLUG 10POS STR 5.08MM	360
0395211012 Woodhead - Molex	TERM BLOCK HDR 12POS VERT 5MM	175
0395121008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 3.81MM	2390
0398600710 Woodhead - Molex	TERM BLOCK HDR 10POS 5.08MM	0
0395033006 Woodhead - Molex	TERM BLOCK PLUG 6POS 90DEG 3.5MM	840
0393730004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 7.5MM	390

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