Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691701550007B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691386700011 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	99
691323100008 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK HEADER, V	382
691307300004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS VERT 3.81MM	228
691351500005 Würth Elektronik Midcom	TERM BLOCK PLUG 5POS 5.08MM	67
691312510014 Würth Elektronik Midcom	TERM BLOCK HDR 14P 90DEG 5.08MM	64
691313510020 Würth Elektronik Midcom	TERM BLOCK HDR 20P 90DEG 5.08MM	111
691313510007 Würth Elektronik Midcom	TERM BLOCK HDR 7POS 90DEG 5.08MM	332
691344510007 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, HOR	160
691317410006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS 90DEG 7.62MM	0
691340700012 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK PLUG, HOR	38
691337500012 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	29
691311500114 Würth Elektronik Midcom	TERM BLOCK HDR 14POS VERT 5.08MM	119
691311700112 Würth Elektronik Midcom	TERM BLOCK HDR 12POS VERT 5MM	209
691351500009 Würth Elektronik Midcom	TERM BLOCK PLUG 9POS 5.08MM	300
691311400003 Würth Elektronik Midcom	TERM BLOCK HDR 3POS VERT 7.62MM	254
691382030002 Würth Elektronik Midcom	TERM BLOCK HDR 2POS VERT 2.5MM	77
691332510006 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	80
691352510002 Würth Elektronik Midcom	TERM BLOCK PLUG 2POS 5.08MM	0
691368300015B Würth Elektronik Midcom	TERM BLOCK PLUG 15POS STR 3.81MM	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