Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691353500023 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	20
691351400002 Würth Elektronik Midcom	TERM BLOCK PLUG 2POS 7.62MM	2551
691311700004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS VERT 5MM	150
691314520109 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, 4	125
691304530006 Würth Elektronik Midcom	WR-TBL SERIES 3045_5.08 MM_SCREW	308
691365310007 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, HOR	239
691701540003B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	498
691359340004 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, HOR	172
691305140003 Würth Elektronik Midcom	TERM BLOCK HEADER 3POS 90 3.5MM	1198
691321300008 Würth Elektronik Midcom	TERM BLOCK HDR 8POS VERT 3.81MM	48
691381030003 Würth Elektronik Midcom	TERM BLOCK PLUG 3POS STR 2.5MM	18
691305140005 Würth Elektronik Midcom	TERM BLOCK HEADER 5POS 90 3.5MM	100
691363310002 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, HOR	437
691322310003 Würth Elektronik Midcom	TERM BLOCK HDR 3POS 90DEG 3.81MM	2136
691311700006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS VERT 5MM	100
691701530011B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	250
691323300007 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	575
691307400007 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK HEADER, V	168
691701500006B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	300
691381000002 Würth Elektronik Midcom	TERM BLOCK PLUG 2POS STR 2.5MM	1870

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