Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1952050 Phoenix Contact	TERM BLOCK PLUG 5POS STR 3.5MM	188
ELVH03100 Socapex (Amphenol Pcd)	TERM BLOCK HDR 3POS 90DEG 3.81MM	0
1804768 Phoenix Contact	TERM BLOCK HDR 10POS VERT 7.62MM	5
1935022 Phoenix Contact	TERM BLOCK PLUG 3POS 90DEG 5MM	210
VC0601510000G Anytek (Amphenol Anytek)	TERM BLOCK HDR 6POS VERT 7.62MM	0
1830130 Phoenix Contact	TERM BLOCK HDR 10POS 3.81MM	22
1720495 Phoenix Contact	TERM BLOCK HDR 5POS 90DEG 7.62MM	147
HW0250520000G Anytek (Amphenol Anytek)	TERM BLOCK PLUG 2POS STR 5.08MM	0
284061-3 TE Connectivity AMP Connectors	TERM BLOCK HDR 6POS 90DEG 5.08MM	688
1525160000 Weidmuller	TERM BLOCK HDR 12POS VERT 5.08MM	0
1097707 Phoenix Contact	TERM BLOCK HEADER 7.62MM 2POS	0
1925702 Phoenix Contact	TERM BLOCK PLUG 3POS STR 5.08MM	5850
1950050000 Weidmuller	TERM BLOCK PLUG 3POS 5.08MM	2304
282805-2 TE Connectivity AMP Connectors	TERM BLOCK PLUG 2POS STR 5MM	0
1711404 Phoenix Contact	TERM BLOCK PLUG 5POS STR 10.16MM	28
1720822 Phoenix Contact	TERM BLOCK HDR 5POS 90DEG 7.62MM	51
1946250000 Weidmuller	TERM BLOCK PLUG 2POS 5.08MM	495
1690500000 Weidmuller	TERM BLOCK PLUG 10POS STR 3.5MM	13550
691701540010B Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	500
1859580 Phoenix Contact	TERM BLOCK HDR 9POS VERT 5.08MM	100

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