Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1794870000 Weidmuller	TERM BLOCK HDR 8POS 90DEG 3.5MM	0
1955510000 Weidmuller	TERM BLOCK PLUG 8POS STR 5MM	2436
1002310000 Weidmuller	TERM BLOCK PLUG 5POS 5.08MM	96
1970380000 Weidmuller	TERM BLOCK PLUG 5POS STR 3.81MM	150
1122100000 Weidmuller	TERM BLOCK HDR 5POS VERT 7.62MM	88144
1615770000 Weidmuller	TERM BLOCK PLUG 16POS STR 3.5MM	610
1597420000 Weidmuller	TERM BLOCK PLUG 8POS STR 3.5MM	3634422
1289310000 Weidmuller	TERM BLOCK HDR 14POS 90DEG 3.5MM	0
1001040000 Weidmuller	TERM BLOCK PLUG 5POS STR 5.08MM	100
1799000000 Weidmuller	TERM BLOCK PLUG 16POS 3.81MM	0
2741560000 Weidmuller	PCB CONNECTOR, PLUG, 5.00MM PITC	168
1716510000 Weidmuller	TERM BLOCK PLUG 6POS STR 5.08MM	19750
1955470000 Weidmuller	TERM BLOCK PLUG 12POS STR 5MM	0
1278050000 Weidmuller	TERM BLOCK PLUG 6POS STR 3.5MM	53
1615710000 Weidmuller	TERM BLOCK PLUG 9POS STR 3.5MM	25
1375770000 Weidmuller	B2CF 3.50/14/180F SN BK BX	50
2647030000 Weidmuller	TERM BLK PLUG 3POS 90DEG 5.08MM	149150
1638790000 Weidmuller	TERM BLOCK PLUG 3POS 90DEG 3.5MM	1061914
1780180000 Weidmuller	TERM BLOCK HDR 2POS 90DEG 5.08MM	713100
1146490000 Weidmuller	TERM BLOCK HDR 8POS VERT 5.08MM	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