Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1-284506-2 TE Connectivity AMP Connectors	TERM BLOCK PLUG 12POS STR 3.5MM	497
1-796642-2 TE Connectivity AMP Connectors	TERM BLOCK HDR 12POS VERT 5MM	698
2319461-2 TE Connectivity AMP Connectors	WIREMATE 2-PIECE 5MM CONN ASSY,	3527
2-1986693-4 TE Connectivity AMP Connectors	TERM BLOCK PLUG 24POS STR 3.5MM	0
282825-7 TE Connectivity AMP Connectors	TERM BLOCK HDR 7POS VERT 5.08MM	309
1986484-9 TE Connectivity AMP Connectors	TERM BLOCK PLUG 9POS STR 5.08MM	10
1986484-7 TE Connectivity AMP Connectors	TERM BLOCK PLUG 7POS STR 5.08MM	0
1-2213934-2 TE Connectivity AMP Connectors	SMT TB PERP PLUG, 5.0MM, 12 POS	251
2318582-7 TE Connectivity AMP Connectors	WIREMATE 2-PIECE 8MM CONN ASSY,	780
1986720-4 TE Connectivity AMP Connectors	TERM BLOCK PLUG 4POS STR 3.81MM	486
1-1986692-1 TE Connectivity AMP Connectors	TERM BLOCK PLUG 11POS STR 3.5MM	0
1-2342083-4 TE Connectivity AMP Connectors	TERM BLCK HDR 14POS 90DEG 5.08MM	200
284040-6 TE Connectivity AMP Connectors	TERM BLOCK PLUG 6POS 270DEG 5MM	249
1546105-8 TE Connectivity AMP Connectors	TERM BLOCK PLUG 8POS 5.08MM	0
1-1986723-4 TE Connectivity AMP Connectors	TERM BLOCK PLUG 14POS STR 3.5MM	0
796980-2 TE Connectivity AMP Connectors	TERM BLOCK HDR 2POS VERT 7.62MM	353
284519-3 TE Connectivity AMP Connectors	TERM BLOCK HDR 3POS VERT 3.81MM	0
284040-4 TE Connectivity AMP Connectors	TERM BLOCK PLUG 4POS 270DEG 5MM	44
796866-3 TE Connectivity AMP Connectors	TERM BLOCK HDR 3POS 90DEG 5.08MM	714
284506-7 TE Connectivity AMP Connectors	TERM BLOCK PLUG 7POS STR 3.5MM	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