Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1944840000 Weidmuller	TERM BLOCK PLUG 3POS STR 5.08MM	206
1122130000 Weidmuller	TERM BLOCK HDR 4POS VERT 7.62MM	126
1013460000 Weidmuller	TERM BLOCK PLUG 5POS STR 5.08MM	144
1069570000 Weidmuller	TERM BLOCK HDR 4POS 90DEG 5MM	258
1761042001 Weidmuller	TERM BLOCK HDR 10POS VERT 3.5MM	0
1775722001 Weidmuller	TERM BLOCK HDR 14POS VERT 5.08MM	99
2647940000 Weidmuller	TERM BLK PLUG 2POS 180DEG 5.08MM	179180
1525110000 Weidmuller	TERM BLOCK HDR 12POS VERT 5.08MM	122250
1728700000 Weidmuller	TERM BLOCK HDR 20POS 90DEG 3.5MM	7542
2649600000 Weidmuller	TERM BLK HDR 4POS 180DEG 5.08MM	268300
1729660000 Weidmuller	TERM BLOCK HDR 20POS VERT 3.5MM	0
1282960000 Weidmuller	TERM BLOCK PLUG 14POS STR 5.08MM	26240
1596150000 Weidmuller	TERM BLOCK HDR 4POS 90DEG 5MM	200
1278290000 Weidmuller	TERM BLOCK PLUG 16POS STR 3.5MM	288108
1278250000 Weidmuller	TERM BLOCK PLUG 8POS STR 3.5MM	216
1639720000 Weidmuller	TERM BLOCK PLUG 4POS 3.5MM	132
1862550000 Weidmuller	TERM BLOCK HDR 10POS 3.81MM	35100
1638650000 Weidmuller	TERM BLOCK PLUG 12POS 3.5MM	25
1521860000 Weidmuller	TERM BLOCK HDR 2POS VERT 5.08MM	21022300
1770950000 Weidmuller	TERM BLOCK PLUG 3POS STR 3.5MM	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