Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1952801 Phoenix Contact	TERM BLOCK HDR 8POS VERT 3.5MM	12
1758830 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5.08MM	421950
1709490 Phoenix Contact	TERM BLOCK HDR 5POS VERT 5.08MM	0
1875425 Phoenix Contact	TERM BLOCK HDR 2POS VERT 3.81MM	665
1840476 Phoenix Contact	TERM BLOCK PLUG 13POS STR 3.5MM	50
1998849 Phoenix Contact	TERM BLOCK HDR 8POS VERT 10.16MM	0
1860853 Phoenix Contact	CONN TERM BLOCK PLG 10POS 5.08MM	55
1877627 Phoenix Contact	TERM BLOCK HDR 4POS 90DEG 5.08MM	0
5452217 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5MM	0
1766408 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 7.5MM	290
2853763 Phoenix Contact	TERM BLOCK HDR 3POS 90DEG 5MM	109
2201789 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG	60
1828540 Phoenix Contact	TERM BLOCK PLUG 7POS 3.81MM	25
1847893 Phoenix Contact	TERM BLOCK PLUG 3POS 7.62MM	50
1927221 Phoenix Contact	TERM BLOCK PLUG 4POS 7.62MM	0
1833069 Phoenix Contact	TERM BLOCK RCPT 6POS 3.81MM	144
1954951 Phoenix Contact	TERM BLOCK HDR 6POS 90DEG 5.08MM	33
1767106 Phoenix Contact	TERM BLOCK PLUG 12POS STR 7.62MM	32
3043187 Phoenix Contact	TERM BLOCK PLUG 1POS STR	0
1787111 Phoenix Contact	TERM BLOCK HDR 24POS 90DEG 3.5MM	557

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