Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691344510003 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, HOR	235
691357310006B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, D	160
691307300012 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	94
691386700012 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	39
691368300019B Würth Elektronik Midcom	TERM BLOCK PLUG 19POS STR 3.81MM	0
691307500006 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	303
691351500016 Würth Elektronik Midcom	TERM BLOCK PLUG 16POS 5.08MM	47
691371700004B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, V	119
691305140012 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK HEADER, H	232
691701550009B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691335510008 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	120
691318700012 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, V	115
691370710003B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	137
691358710006 Würth Elektronik Midcom	TERM BLOCK PLUG 6POS 5.08MM	0
691321300006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS VERT 3.81MM	181
691325310004 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	647
691382040004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS 90DEG 2.5MM	38
691701540005B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691311700102 Würth Elektronik Midcom	TERM BLOCK HDR 2POS VERT 5MM	2127
691318400002 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK HEADER, V	55

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