Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1776362001 Weidmuller	TERM BLOCK HDR 2POS VERT 5.08MM	0
1944350000 Weidmuller	TERM BLOCK PLUG 4POS STR 5.08MM	136780
1612020000 Weidmuller	TERM BLOCK PLUG 4POS 90DEG 7MM	641130
1971650000 Weidmuller	TERM BLOCK PLUG 6POS STR 3.81MM	99
1519760000 Weidmuller	TERM BLOCK HDR 4POS VERT 5.08MM	14862000
1690190000 Weidmuller	TERM BLOCK PLUG 2POS STR 3.5MM	149100
1711990000 Weidmuller	TERM BLOCK PLUG 5POS STR 5.08MM	0
1944880000 Weidmuller	TERM BLOCK PLUG 7POS STR 5.08MM	90
1969200000 Weidmuller	TERM BLOCK PLUG 13POS STR 3.81MM	94
1148520000 Weidmuller	TERM BLOCK HDR 3POS VERT 5.08MM	7
2000440000 Weidmuller	PCB PLUG-IN CONNECTOR, MALE HEAD	18
1727990000 Weidmuller	TERM BLOCK HDR 6POS 90DEG 3.5MM	0
1948030000 Weidmuller	TERM BLOCK PLUG 5POS 5.08MM	864
2640760000 Weidmuller	TERM BLK PLUG 2POS 180DEG 3.5MM	290290
1924710000 Weidmuller	TERM BLOCK PLUG 3POS STR 10.16MM	94
1060440000 Weidmuller	TERM BLOCK PLUG 2POS STR 7.62MM	100
1581490000 Weidmuller	TERM BLOCK HDR 19POS VERT 5MM	100
1776592001 Weidmuller	TERM BLOCK HDR 24POS VERT 5.08MM	0
1646310000 Weidmuller	TERM BLOCK HDR 8POS VERT 5.08MM	80
1793290000 Weidmuller	TERM BLOCK HDR 8POS 90DEG 3.81MM	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