Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691312410002 Würth Elektronik Midcom	TERM BLOCK HDR 2POS 90DEG 7.62MM	424
691304130007 Würth Elektronik Midcom	TERM BLOCK PLUG 7POS 180 3.50MM	0
691321300005 Würth Elektronik Midcom	TERM BLOCK HDR 5POS VERT 3.81MM	0
691351500024 Würth Elektronik Midcom	TERM BLOCK PLUG 24POS 5.08MM	24
691320510012 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	36
691374500019B Würth Elektronik Midcom	TERM BLOCK PLUG 19POS STR 5.08MM	0
691701540007B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
691348400004 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, VER	196
691335510010 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, D	199
691307400002 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK HEADER, V	388
691305540010 Würth Elektronik Midcom	WR-TBL SERIES 3055_5.08 MM_PCB H	284
691312410006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS 90DEG 7.62MM	0
691311700105 Würth Elektronik Midcom	TERM BLOCK HDR 5POS VERT 5MM	933
691317710003 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, H	490
691351500002 Würth Elektronik Midcom	TERM BLOCK PLUG 2POS 5.08MM	3301
691343410002 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, HOR	264
691318500008 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, V	218
691305340003 Würth Elektronik Midcom	TERM BLOCK HEADER 3POS 90 3.8MM	750
691361100012 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, VER	200
691382030007 Würth Elektronik Midcom	2.50 MM TERMINAL BLOCK HEADER, T	659

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