Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691317710006 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	412
691701550005B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691305330012 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	274
691343710008 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK PLUG, VER	149
691340400012 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, VER	15
691352510004 Würth Elektronik Midcom	TERM BLOCK PLUG 4POS 5.08MM	69
691374500024B Würth Elektronik Midcom	TERM BLOCK PLUG 24POS STR 5.08MM	0
691305330003 Würth Elektronik Midcom	TERM BLOCK HDR 3POS VERT 3.8MM	1489
691312710005 Würth Elektronik Midcom	TERM BLOCK HDR 5POS 90DEG 5MM	0
691385700005 Würth Elektronik Midcom	TERM BLOCK PLUG 5POS STR 5MM	0
691305330004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS VERT 3.8MM	352
691344710008 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK PLUG, HOR	158
691701550010B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691305140008 Würth Elektronik Midcom	TERM BLOCK HEADER 8POS 90 3.5MM	350
691351500006 Würth Elektronik Midcom	TERM BLOCK PLUG 6POS 5.08MM	159
691311400008 Würth Elektronik Midcom	TERM BLOCK HDR 8POS VERT 7.62MM	0
691701340004B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	868
691344410008 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, HOR	100
691701350005B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	900
691373500019B Würth Elektronik Midcom	TERM BLOCK PLUG 19POS STR 5.08MM	0

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