Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1821287 Phoenix Contact	TERM BLOCK HDR 6POS 90DEG 2.54MM	0
1605160000 Weidmuller	TERM BLOCK HDR 11POS 90DEG 3.5MM	0
691343410007 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, HOR	100
1984390 Phoenix Contact	TERM BLOCK PLUG 10POS 3.5MM	62
691361300007 Würth Elektronik Midcom	TERM BLOCK PLUG 7POS 3.81MM	178
1786404 Phoenix Contact	TERM BLOCK HDR 2POS 90DEG 5.08MM	4450
1843826 Phoenix Contact	TERM BLOCK HDR 5POS 90DEG 3.5MM	0
691308330004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS VERT 3.81MM	0
1581480000 Weidmuller	TERM BLOCK HDR 18POS VERT 5MM	120
1013680000 Weidmuller	TERM BLOCK PLUG 2POS STR 5.08MM	837
1737725 Phoenix Contact	TERM BLOCK PLUG 4POS 90DEG 7.5MM	1050
1737819 Phoenix Contact	TERM BLOCK PLUG 2POS 7.5MM	1
1277830000 Weidmuller	TERM BLOCK PLUG 32POS STR 3.5MM	24
1511460000 Weidmuller	TERM BLOCK HDR 13POS 5.08MM	86
1277280000 Weidmuller	TERM BLOCK PLUG 6POS STR 3.5MM	100
1952801 Phoenix Contact	TERM BLOCK HDR 8POS VERT 3.5MM	12
EBPA-02-C Adam Tech	EURO BLOCK 2P	208
1758830 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5.08MM	421950
0395038002 Woodhead - Molex	TERM BLOCK PLUG 2POS 90DEG 3.5MM	1937
1709490 Phoenix Contact	TERM BLOCK HDR 5POS 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