Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691345410012 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, HOR	25
691382010005 Würth Elektronik Midcom	TERM BLOCK HDR 5POS 90DEG 2.5MM	700
691304530009 Würth Elektronik Midcom	WR-TBL SERIES 3045_5.08 MM_SCREW	100
691313710004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS 90DEG 5MM	203
691365110008 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, HOR	234
691305530009 Würth Elektronik Midcom	WR-TBL SERIES 3055_5.08 MM_PCB H	320
691304100008 Würth Elektronik Midcom	WR-TBL SERIES 3041_3.50 MM_SCREW	336
691313410004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS 90DEG 7.62MM	444
691305340008 Würth Elektronik Midcom	TERM BLOCK HEADER 8POS 90 3.8MM	0
691351400005 Würth Elektronik Midcom	TERM BLOCK PLUG 5POS 7.62MM	0
691370710004B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	119
691701340008B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	855
691352510023 Würth Elektronik Midcom	TERM BLOCK PLUG 23POS 5.08MM	10
691304330006 Würth Elektronik Midcom	TERM BLOCK PLUG 6POS 180 3.81MM	35
691701530007B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691382030004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS VERT 2.5MM	300
691309310003 Würth Elektronik Midcom	TERM BLOCK HDR 3POS 90DEG 3.81MM	200
691374500003B Würth Elektronik Midcom	TERM BLOCK PLUG 3POS STR 5.08MM	58
691317710002 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	431
691351400003 Würth Elektronik Midcom	TERM BLOCK PLUG 3POS 7.62MM	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