Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395211007 Woodhead - Molex	TERM BLOCK HDR 7POS VERT 5MM	5898
0395000008 Woodhead - Molex	TERM BLOCK PLUG 8POS STR 3.5MM	4183
0395224004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 5MM	5720
0395315006 Woodhead - Molex	TERM BLOCK HDR 6POS VERT 5.08MM	1500
0395178008 Woodhead - Molex	TERM BLOCK PLUG 8POS 3.81MM	648
0395126012 Woodhead - Molex	TERM BLOCK HDR 12POS 3.81MM	1097
0395026005 Woodhead - Molex	TERM BLOCK HDR 5POS 90DEG 3.5MM	1951
0395221008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 5MM	0
0395061003 Woodhead - Molex	TERM BLOCK HDR 3POS 90DEG 3.5MM	2991
0395321003 Woodhead - Molex	TERM BLOCK HDR 3POS 90DEG 5.08MM	254
0395265011 Woodhead - Molex	TERM BLOCK HDR 11POS 90DEG 5MM	600
0395316007 Woodhead - Molex	TERM BLOCK HDR 7POS VERT 5.08MM	980
0395137006 Woodhead - Molex	TERM BLOCK PLUG 6POS 3.81MM	1030
0395005008 Woodhead - Molex	TERM BLOCK PLUG 8POS STR 3.5MM	0
0395037008 Woodhead - Molex	TERM BLOCK PLUG 8POS 3.5MM	580
0395000020 Woodhead - Molex	TERM BLOCK PLUG 20POS STR 3.5MM	116
0395316006 Woodhead - Molex	TERM BLOCK HDR 6POS VERT 5.08MM	1047
0395011019 Woodhead - Molex	TERM BLOCK HDR 19POS VERT 3.5MM	0
0395333005 Woodhead - Molex	TERM BLOCK PLUG 5POS 5.08MM	395
0395137011 Woodhead - Molex	TERM BLOCK PLUG 11POS 3.81MM	638

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