Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691307300007 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	390
691364100005 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, VER	320
691312710003 Würth Elektronik Midcom	TERM BLOCK HDR 3POS 90DEG 5MM	533
691382010007 Würth Elektronik Midcom	2.50 MM TERMINAL BLOCK HEADER, H	345
691701510004B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	206
691701550008B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691304300007 Würth Elektronik Midcom	WR-TBL SERIES 3043_3.81MM_SCREWL	346
691701350004B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	722
691371700008B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, V	99
691318500004 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	277
691353500020 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	15
691313510004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS 90DEG 5.08MM	3234
691321300014 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	170
691311500118 Würth Elektronik Midcom	TERM BLOCK HDR 18POS VERT 5.08MM	24
691382040012 Würth Elektronik Midcom	2.50 MM TERMINAL BLOCK HEADER, H	209
691382030008 Würth Elektronik Midcom	TERM BLOCK HDR 8POS VERT 2.5MM	100
691310340006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS 90DEG 3.81MM	0
691311500005 Würth Elektronik Midcom	TERM BLOCK HDR 5POS VERT 5.08MM	19
691310340002 Würth Elektronik Midcom	TERM BLOCK HDR 2POS 90DEG 3.81MM	0
691363110008 Würth Elektronik Midcom	TERM BLOCK PLUG 8POS 90DEG 3.5MM	186

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