Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
ELFD06220 Socapex (Amphenol Pcd)	TERM BLOCK HDR 6POS 90DEG 5.08MM	0
ELFH14110J Socapex (Amphenol Pcd)	TERM BLOCK HDR 14POS 90DEG 5MM	0
FXPT112G0 Socapex (Amphenol Pcd)	.200"/5.08MM FLEXIPLUG HYBRID	0
ELFR12250 Socapex (Amphenol Pcd)	.200"/5.08MM REVERSED VERT HDR C	0
ELFH0725GE Socapex (Amphenol Pcd)	.200"/5.08MM VERT HDR CLOSED END	0
ELFH17230 Socapex (Amphenol Pcd)	TERM BLOCK HDR 17POS 5.08MM	0
ELFH14210J Socapex (Amphenol Pcd)	TERM BLOCK HDR 14POS 5.08MM	100
ELFH0623G Socapex (Amphenol Pcd)	.200"/5.08MM R/A HDR CLOSED ENDS	0
ELXR11500 Socapex (Amphenol Pcd)	3.5MM/.138" REVERSE VERT HDR, CL	0
ELFF11140 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 11POS 270DEG 5MM	0
ELFF0524G Socapex (Amphenol Pcd)	.200"/5.08MM FRONT/FRONT BOTTOM	0
ELFR05240 Socapex (Amphenol Pcd)	.200"/5.08MM REVERSED R/A HDR OP	0
ELFB1923G Socapex (Amphenol Pcd)	.200"/5.08MM MALE HDR, R/A BOARD	0
ELFT04150 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 4POS 90DEG 5MM	0
ELFH0718GE Socapex (Amphenol Pcd)	5MM/.197" VERT HDR CLOSED ENDS H	0
ELFH22230 Socapex (Amphenol Pcd)	TERM BLOCK HDR 22POS 5.08MM	0
ELFB21180 Socapex (Amphenol Pcd)	5MM/.197" MALE HDR, VERT BOARD-M	0
ELVT18500 Socapex (Amphenol Pcd)	TERM BLOCK PLUG 18POS 3.81MM	0
ELVD26500 Socapex (Amphenol Pcd)	TERM BLOCK HDR 26POS VERT 3.81MM	0
ELFH15210J Socapex (Amphenol Pcd)	TERM BLOCK HDR 15POS 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