Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1851070 Phoenix Contact	TERM BLOCK PLUG 5POS STR 3.81MM	175100
1757239 Phoenix Contact	TERM BLOCK PLUG 24POS STR 5.08MM	55600
1892440 Phoenix Contact	TERM BLOCK HDR 6POS 90DEG 7.62MM	0
1861690 Phoenix Contact	CONN TERM BLOCK PLUG 2POS 5.08MM	187
1777862 Phoenix Contact	TERM BLOCK PLUG 5POS STR 7.62MM	0
1787292 Phoenix Contact	TERM BLOCK HDR 22POS VERT 3.5MM	50
1809429 Phoenix Contact	TERM BLOCK HDR 18POS VERT 5.08MM	0
1796322 Phoenix Contact	TERM BLOCK HDR 2POS VERT 5.08MM	30
1792773 Phoenix Contact	TERM BLOCK PLUG 4POS 5.08MM	409
1716955 Phoenix Contact	TERM BLOCK PLUG HYBRID 4+4POS	40
1975846 Phoenix Contact	TERM BLOCK PLUG 5POS STR 10.16MM	0
1923814 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 5MM	52
1875548 Phoenix Contact	TERM BLOCK HDR 14POS VERT 3.81MM	50
1779848 Phoenix Contact	TERM BLOCK PLUG 3POS STR 5MM	248900
1777833 Phoenix Contact	TERM BLOCK PLUG 2POS STR 7.62MM	1583750
1880669 Phoenix Contact	TERM BLOCK PLUG 12POS STR 5.08MM	39
1790470 Phoenix Contact	TERM BLOCK PLUG 40POS STR 3.5MM	0
1795815 Phoenix Contact	TERM BLOCK PLUG 6POS STR 7.62MM	35
1902152 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5.08MM	100
1720589 Phoenix Contact	TERM BLOCK HDR 3POS VERT 7.62MM	211

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