Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1862490000 Weidmuller	TERM BLOCK HDR 4POS 90DEG 3.81MM	608
1638550000 Weidmuller	TERM BLOCK PLUG 2POS 90DEG 3.5MM	1
1775522001 Weidmuller	TERM BLOCK HDR 2POS VERT 5.08MM	0
1793650000 Weidmuller	TERM BLOCK HDR 6POS VERT 3.81MM	16
1799220000 Weidmuller	TERM BLOCK PLUG 8POS 3.81MM	16
1944330000 Weidmuller	TERM BLOCK PLUG 2POS STR 5.08MM	148
1001580000 Weidmuller	TERM BLOCK PLUG 7POS 5.08MM	96
1638880000 Weidmuller	TERM BLOCK PLUG 12POS 3.5MM	1931386
2741640000 Weidmuller	PCB CONNECTOR, PLUG, 5.00MM PITC	36
1982750000 Weidmuller	TERM BLOCK PLUG 7POS 5.08MM	96
1515060000 Weidmuller	TERM BLOCK HDR 3POS 90DEG 5.08MM	3481500
1726800000 Weidmuller	TERM BLOCK HDR 16POS VERT 5.08MM	0
1626000000 Weidmuller	TERM BLOCK HDR 3POS 90DEG 5MM	323
1748560000 Weidmuller	TERM BLOCK PLUG 20POS STR 3.5MM	0
1838410000 Weidmuller	TERM BLOCK HDR 22POS VERT 5.08MM	37
1618980000 Weidmuller	TERM BLOCK HDR 24POS VERT 3.5MM	40
1347660000 Weidmuller	TERM BLOCK HDR 10POS 5.08MM	77
1484360000 Weidmuller	TERM BLOCK PLUG 3POS STR 5.08MM	118
2641160000 Weidmuller	TERM BLK HDR 4POS 90DEG 3.5MM	480480
1838310000 Weidmuller	TERM BLOCK HDR 12POS VERT 5.08MM	45

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