Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691382030012 Würth Elektronik Midcom	2.50 MM TERMINAL BLOCK HEADER, V	226
691304300006 Würth Elektronik Midcom	WR-TBL SERIES 3043_3.81MM_SCREWL	495
691348400005 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, VER	179
691370710005B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	120
691343510008 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, HOR	80
691348300007 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, VER	440
691345410004 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, HOR	160
691365310004 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, HOR	239
691305330008 Würth Elektronik Midcom	TERM BLOCK HDR 8POS VERT 3.8MM	380
691313510017 Würth Elektronik Midcom	TERM BLOCK HDR 17P 90DEG 5.08MM	59
691701310009B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	500
691311500115 Würth Elektronik Midcom	TERM BLOCK HDR 15POS VERT 5.08MM	80
691340400006 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, VER	100
691336500004 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	200
691340400008 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, VER	90
691366110003 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, HOR	760
691381030008 Würth Elektronik Midcom	TERM BLOCK PLUG 8POS STR 2.5MM	130
691304100010 Würth Elektronik Midcom	WR-TBL SERIES 3041_3.50 MM_SCREW	298
691370710012B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	29
691309410003 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK HEADER, H	228

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