Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691701520007B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	300
691701500012B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	150
691364100004 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, VER	470
691334500004 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	140
691352410005 Würth Elektronik Midcom	TERM BLOCK PLUG 5POS 7.62MM	0
691312510011 Würth Elektronik Midcom	TERM BLOCK HDR 11P 90DEG 5.08MM	229
691307500007 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	259
691382000005 Würth Elektronik Midcom	TERM BLOCK HDR 5POS VERT 2.5MM	583
691344710012 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK PLUG, HOR	20
691311500017 Würth Elektronik Midcom	TERM BLOCK HDR 17POS VERT 5.08MM	89
691701540006B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	479
691358310008 Würth Elektronik Midcom	TERM BLOCK PLUG 8POS 3.81MM	0
691701530008B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691323100003 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK HEADER, V	674
691367110002 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, HOR	224
691313710007 Würth Elektronik Midcom	TERM BLOCK HDR 7POS 90DEG 5MM	338
691361100007 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, VER	481
691317410008 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK HEADER, H	199
691352710006 Würth Elektronik Midcom	TERM BLOCK PLUG 6POS 5MM	193
691701340010B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	900

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