Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1778085 Phoenix Contact	TERM BLOCK PLUG 12POS STR 5.08MM	100
1736687 Phoenix Contact	TERM BLOCK HDR 6POS 90DEG 5MM	0
1828948 Phoenix Contact	TERM BLOCK HDR 5POS VERT 7.62MM	11
1758380 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5.08MM	175
3043051 Phoenix Contact	TERM BLOCK PLUG 1POS STR	41
1755503 Phoenix Contact	TERM BLOCK HDR 10POS VERT 5MM	5897900
1804807 Phoenix Contact	TERM BLOCK HDR 3POS 90DEG 7.62MM	1922150
1843402 Phoenix Contact	TERM BLOCK HDR 20POS VERT 3.5MM	59
1912281 Phoenix Contact	TERM BLOCK PLUG 12POS STR 5.08MM	76
1874141 Phoenix Contact	TERM BLOCK PLUG 6POS 5.08MM	0
1851274 Phoenix Contact	TERM BLOCK PLUG 6POS STR 3.81MM	17
1808887 Phoenix Contact	TERM BLOCK PLUG 9POS STR 5.08MM	189
1827790 Phoenix Contact	TERM BLOCK PLUG 11POS STR 3.81MM	7
1912197 Phoenix Contact	TERM BLOCK PLUG 3POS STR 5.08MM	150
1945119 Phoenix Contact	TERM BLOCK HDR 4POS VERT 3.5MM	19691
1755765 Phoenix Contact	TERM BLOCK HDR 5POS VERT 5.08MM	27829000
1843114 Phoenix Contact	TERM BLOCK HDR 12POS 3.81MM	189
1847958 Phoenix Contact	TERM BLOCK PLUG 9POS 7.62MM	50
1778667 Phoenix Contact	TERM BLOCK HDR 6POS 90DEG 2.5MM	106
1757530 Phoenix Contact	TERM BLOCK HDR 9POS 90DEG 5MM	30

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