Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1934887 Phoenix Contact	TERM BLOCK PLUG 4POS 90DEG 5MM	18665750
0395215009 Woodhead - Molex	TERM BLOCK HDR 9POS VERT 5MM	900
XW4K-06A1-V1 Omron Electronics Components	TERM BLOCK HDR 6POS VERT 2.54MM	406
0395166008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 3.81MM	1598
1043930000 Weidmuller	TERM BLOCK PLUG 4POS STR 7.62MM	69
691311400108 Würth Elektronik Midcom	TERM BLOCK HDR 8POS VERT 7.62MM	284
5448640 Phoenix Contact	TERM BLOCK PLUG 5POS STR 5.08MM	81
1717019 Phoenix Contact	TERM BLOCK HEADER 7.62MM 5POS	49
691364300012 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK PLUG, VER	88
25-E1500-06 NTE Electronics, Inc.	TERMINAL BLOCK EUROSTYLE	96
1924017 Phoenix Contact	TERM BLOCK HDR 6POS 90DEG 5MM	25
1738788 Phoenix Contact	TERM BLOCK HDR 4POS VERT 5.08MM	0
1784855 Phoenix Contact	TERM BLOCK PLUG 2POS STR 15MM	32
EDZ960/3 On-Shore Technology, Inc.	TERM BLOCK PLUG 3POS STR 7.62MM	0
691322310022 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	120
XW4H-02A1 Omron Electronics Components	TERM BLOCK PLUG 2POS STR 2.54MM	309
1755927 Phoenix Contact	TERM BLOCK HDR 21POS VERT 5.08MM	45
EDZ950/18 On-Shore Technology, Inc.	TERM BLOCK PLUG 18POS STR 5.08MM	15
1638560000 Weidmuller	TERM BLOCK PLUG 3POS 90DEG 3.5MM	71
5435721 Phoenix Contact	TERM BLOCK PLUG 2POS STR 5.08MM	36

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