Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691364300002 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, VER	337
691340700004 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK PLUG, HOR	166
691381030006 Würth Elektronik Midcom	TERM BLOCK PLUG 6POS STR 2.5MM	74
691309510008 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	179
691321100006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS VERT 3.5MM	970
691311500113 Würth Elektronik Midcom	TERM BLOCK HDR 13POS VERT 5.08MM	0
691381000012 Würth Elektronik Midcom	2.50 MM TERMINAL BLOCK PLUG, VER	425
691304100002 Würth Elektronik Midcom	WR-TBL SERIES 3041_3.50 MM_SCREW	776
691352710005 Würth Elektronik Midcom	TERM BLOCK PLUG 5POS 5MM	405
691701500008B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	300
691381000008 Würth Elektronik Midcom	TERM BLOCK PLUG 8POS STR 2.5MM	937
691312510019 Würth Elektronik Midcom	TERM BLOCK HDR 19P 90DEG 5.08MM	44
691340400002 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, VER	168
691322310017 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	110
691373500023B Würth Elektronik Midcom	TERM BLOCK PLUG 23POS STR 5.08MM	0
691321100012 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK HEADER, V	401
691701350012B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	450
691701540002B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	457
691385700014 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK PLUG, HOR	24
691368300016B Würth Elektronik Midcom	TERM BLOCK PLUG 16POS STR 3.81MM	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