Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691317410007 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK HEADER, H	238
691305530003 Würth Elektronik Midcom	WR-TBL SERIES 3055_5.08 MM_PCB H	682
691701510002B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	288
691327310010 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, D	276
691313510019 Würth Elektronik Midcom	TERM BLOCK HDR 19P 90DEG 5.08MM	60
691322310012 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	202
691305140004 Würth Elektronik Midcom	TERM BLOCK HEADER 4POS 90 3.5MM	330
691307300006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS VERT 3.81MM	222
691322310006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS 90DEG 3.81MM	126
691361300009 Würth Elektronik Midcom	TERM BLOCK PLUG 9POS 3.81MM	205
691320510006 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	160
691311400002 Würth Elektronik Midcom	TERM BLOCK HDR 2POS VERT 7.62MM	0
691351500012 Würth Elektronik Midcom	TERM BLOCK PLUG 12POS 5.08MM	16
691337500016 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	19
691305540002 Würth Elektronik Midcom	WR-TBL SERIES 3055_5.08 MM_PCB H	547
691348400002 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, VER	355
691322110005 Würth Elektronik Midcom	TERM BLOCK HDR 5POS 90DEG 3.5MM	565
691701320005B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	495
691309510007 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	259
691301710002 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	477

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