Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691311700103 Würth Elektronik Midcom	TERM BLOCK HDR 3POS VERT 5MM	318
691321300002 Würth Elektronik Midcom	TERM BLOCK HDR 2POS VERT 3.81MM	5622
691311400105 Würth Elektronik Midcom	TERM BLOCK HDR 5POS VERT 7.62MM	224
691364300006 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, VER	250
691368300020B Würth Elektronik Midcom	TERM BLOCK PLUG 20POS STR 3.81MM	0
691353500015 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	15
691314520107 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, 4	110
691305330007 Würth Elektronik Midcom	TERM BLOCK HDR 7POS VERT 3.8MM	200
691305330002 Würth Elektronik Midcom	TERM BLOCK HDR 2POS VERT 3.8MM	1242
691311500112 Würth Elektronik Midcom	TERM BLOCK HDR 12POS VERT 5.08MM	524
691701500005B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	300
691325310002 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	477
691385700012 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK PLUG, HOR	14
691701520009B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	300
691366110002 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, HOR	498
691701310002B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	1530
691358310002 Würth Elektronik Midcom	TERM BLOCK PLUG 2POS 3.81MM	0
691351500011 Würth Elektronik Midcom	TERM BLOCK PLUG 11POS 5.08MM	109
691701510009B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	300
691311500013 Würth Elektronik Midcom	TERM BLOCK HDR 13POS VERT 5.08MM	240

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