Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691363110003 Würth Elektronik Midcom	TERM BLOCK PLUG 3POS 90DEG 3.5MM	1077
691348400003 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, VER	259
691304130005 Würth Elektronik Midcom	TERM BLOCK PLUG 5POS 180 3.50MM	0
691313510005 Würth Elektronik Midcom	TERM BLOCK HDR 5POS 90DEG 5.08MM	0
691304100004 Würth Elektronik Midcom	TERM BLOCK PLUG 4POS STR 3.5MM	609
691305130008 Würth Elektronik Midcom	TERM BLOCK HDR 8POS VERT 3.5MM	0
691701350009B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	900
691312510003 Würth Elektronik Midcom	TERM BLOCK HDR 3POS 90DEG 5.08MM	0
691345710002 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK PLUG, HOR	300
691352510007 Würth Elektronik Midcom	TERM BLOCK PLUG 7POS 5.08MM	160
691701550002B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691344410004 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, HOR	200
691363310007 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, HOR	246
691386700008 Würth Elektronik Midcom	TERM BLOCK HDR 8POS VERT 5MM	0
691343410005 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, HOR	120
691340500007 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	175
691353500016 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	15
691318400005 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK HEADER, V	359
691322110002 Würth Elektronik Midcom	TERM BLOCK HDR 2POS 90DEG 3.5MM	4582
691344410012 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, HOR	30

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