Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
ELFH08210J Socapex (Amphenol Pcd)	TERM BLOCK HDR 8POS 90DEG 5.08MM	101
FXPT05200E Socapex (Amphenol Pcd)	TERM BLOCK PLUG 5POS 5.08MM	0
ELFH05450 Socapex (Amphenol Pcd)	TERM BLOCK HDR 5POS VERT 7.62MM	0
ELFP05410 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 5POS STR 7.62MM	0
FXPT09200E Socapex (Amphenol Pcd)	TERM BLOCK PLUG 9POS 5.08MM	2
ELFH07250E Socapex (Amphenol Pcd)	TERM BLOCK HDR 7POS VERT 5.08MM	0
ELFF09230 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 9POS 5.08MM	100
ELFF03230 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 3POS 5.08MM	93
ELFH03250E Socapex (Amphenol Pcd)	TERM BLOCK HDR 3POS VERT 5.08MM	0
ELFB05280 Socapex (Amphenol Pcd)	TERM BLOCK HDR 5POS VERT 5.08MM	333
ELFB11230 Socapex (Amphenol Pcd)	TERM BLOCK HDR 11POS 5.08MM	0
ELFH04250 Socapex (Amphenol Pcd)	TERM BLOCK HDR 4POS VERT 5.08MM	0
ELFH11210E Socapex (Amphenol Pcd)	TERM BLOCK HDR 11POS 5.08MM	0
ELFH03250 Socapex (Amphenol Pcd)	TERM BLOCK HDR 3POS VERT 5.08MM	1240
ELFB04280 Socapex (Amphenol Pcd)	TERM BLOCK HDR 4POS VERT 5.08MM	0
ELFB12230 Socapex (Amphenol Pcd)	TERM BLOCK HDR 12POS 5.08MM	0
SCFF03210 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 3POS STR 5.08MM	0
ELFB08280 Socapex (Amphenol Pcd)	TERM BLOCK HDR 8POS VERT 5.08MM	0
SCFF02210 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 2POS STR 5.08MM	0
ELFH09250E Socapex (Amphenol Pcd)	TERM BLOCK HDR 9POS VERT 5.08MM	0

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