Terminal Blocks - Headers, Plugs and Sockets

Image	Part Number	Description / PDF	Quantity	Rfq
	ELFF15140 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 15POS 270DEG 5MM	0
	ELFK20210 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 20POS 5.08MM	0
	ELXR051G0 Socapex (Amphenol Pcd)	3.5MM/.138" REVERSE R/A HDR, CLO	0
	ELFF0314GE Socapex (Amphenol Pcd)	5MM/.197" FRONT/FRONT BOTTOM PLU	0
	ELFR03110 Socapex (Amphenol Pcd)	5MM/.198" REVERSED R/A HDR CLOSE	0
	ELXT08600E Socapex (Amphenol Pcd)	3.5MM/.138" STRAIGHT PLUG-BOTTOM	0
	ELFH1512G Socapex (Amphenol Pcd)	5MM/.197" R/A HDR OPEN ENDS GRN	0
	ELFF2313G Socapex (Amphenol Pcd)	5MM/.197" FRONT/FRONT TOP PLUG G	0
	ELFR02220 Socapex (Amphenol Pcd)	.200"/5.08MM REVERSED R/A HDR OP	0
	ELFH0724G Socapex (Amphenol Pcd)	.200"/5.08MM R/A HDR OPEN ENDS H	0
	ELFR06280E Socapex (Amphenol Pcd)	.200"/5.08MM REVERSED VERT HDR C	0
	ELVH171G0E Socapex (Amphenol Pcd)	.150"/3.81MM R/A HDR CLOSED ENDS	0
	ELFB0928G Socapex (Amphenol Pcd)	.200"/5.08MM MALE HDR, VERT BOAR	0
	ELXH08100 Socapex (Amphenol Pcd)	TERM BLOCK HDR 8POS 90DEG 3.5MM	0
	ELFR03140 Socapex (Amphenol Pcd)	5MM/.198" REVERSED R/A HDR OPEN	0
	ELFR23160 Socapex (Amphenol Pcd)	5MM/.198" REVERSED VERT HDR OPEN	0
	ELFH0712G Socapex (Amphenol Pcd)	5MM/.197" R/A HDR OPEN ENDS GRN	0
	ELFR20240 Socapex (Amphenol Pcd)	.200"/5.08MM REVERSED R/A HDR OP	0
	ELFR15240 Socapex (Amphenol Pcd)	.200"/5.08MM REVERSED R/A HDR OP	0
	ELVH20500 Socapex (Amphenol Pcd)	TERM BLOCK HDR 20POS VERT 3.81MM	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