Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691317710008 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	299
691312510015 Würth Elektronik Midcom	TERM BLOCK HDR 15P 90DEG 5.08MM	165
691313410008 Würth Elektronik Midcom	TERM BLOCK HDR 8POS 90DEG 7.62MM	0
691353500008 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	85
691371700003B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, V	159
691322310014 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	194
691348500005 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	120
691304100006 Würth Elektronik Midcom	WR-TBL SERIES 3041_3.50 MM_SCREW	171
691312710006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS 90DEG 5MM	0
691374500008B Würth Elektronik Midcom	TERM BLOCK PLUG 8POS STR 5.08MM	0
691701340012B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	38
691338500010 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	79
691382010002 Würth Elektronik Midcom	TERM BLOCK HDR 2POS 90DEG 2.5MM	2032
691359340002 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, HOR	297
691305530007 Würth Elektronik Midcom	WR-TBL SERIES 3055_5.08 MM_PCB H	416
691311700106 Würth Elektronik Midcom	TERM BLOCK HDR 6POS VERT 5MM	247
691353500019 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	15
691311400102 Würth Elektronik Midcom	TERM BLOCK HDR 2POS VERT 7.62MM	1387
691361300012 Würth Elektronik Midcom	TERM BLOCK PLUG 12POS 3.81MM	239
691701340007B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	900

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