Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1755930 Phoenix Contact	TERM BLOCK HDR 22POS VERT 5.08MM	563
1754685 Phoenix Contact	TERM BLOCK PLUG 14POS STR 5MM	85
1845111 Phoenix Contact	TERM BLOCK HDR 22POS 2.54MM	0
5452112 Phoenix Contact	TERM BLOCK HDR 3POS VERT 3.81MM	0
1803280 Phoenix Contact	TERM BLOCK HDR 3POS 90DEG 3.81MM	215613000
1731675 Phoenix Contact	TERM BLOCK HDR 2POS 90DEG 3.5MM	444
1826432 Phoenix Contact	TERM BLOCK PLUG 4POS 270DEG 5MM	0
1763087 Phoenix Contact	TERM BLOCK HDR 6POS VERT 5.08MM	0
1827444 Phoenix Contact	TERM BLOCK HDR 4POS 45DEG 3.81MM	25
1827884 Phoenix Contact	TERM BLOCK HDR 4POS 90DEG 3.81MM	933750
1709173 Phoenix Contact	TERM BLOCK PLUG 4POS STR 7.62MM	217
1818025 Phoenix Contact	TERM BLOCK HDR 5POS VERT 3.5MM	0
1857896 Phoenix Contact	TERM BLOCK PLUG 3POS STR 3.81MM	3432300
1843059 Phoenix Contact	TERM BLOCK HDR 30POS 3.81MM	28
1828841 Phoenix Contact	TERM BLOCK PLUG 6POS STR 7.62MM	14
1784897 Phoenix Contact	TERM BLOCK PLUG 6POS STR 15MM	0
1924428 Phoenix Contact	TERM BLOCK HDR 3POS VERT 5MM	0
1084027 Phoenix Contact	PCB CONNECTOR, NUMBER OF POSITIO	90
1805136 Phoenix Contact	TERM BLOCK PLUG 9POS STR 5.08MM	5
1715031 Phoenix Contact	TERM BLOCK HDR 3POS 90DEG 5.08MM	372

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