Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
2646110000 Weidmuller	TERM BLK HDR 2POS 180DEG 5.00MM	700
0395021020 Woodhead - Molex	TERM BLOCK HDR 20POS 90DEG 3.5MM	270
1640170000 Weidmuller	TERM BLOCK PLUG 3POS 3.5MM	3348
1792427 Phoenix Contact	TERM BLOCK PLUG 20POS 5.08MM	39
284065-8 TE Connectivity AMP Connectors	TERM BLOCK HDR 16POS VERT 5.08MM	181
1755745 Phoenix Contact	TERM BLOCK PLUG 3POS 90DEG 5MM	275
1002280000 Weidmuller	TERM BLOCK PLUG 2POS 5.08MM	270
1-2351885-1 TE Connectivity AMP Connectors	11POS HEADER 180 DEG, 5.00MM, TA	3000
1946300000 Weidmuller	TERM BLOCK PLUG 7POS 5.08MM	96192
1969130000 Weidmuller	TERM BLOCK PLUG 6POS STR 3.81MM	135
691351700003 Würth Elektronik Midcom	TERM BLOCK PLUG 3POS 5MM	52
0395221003 Woodhead - Molex	TERM BLOCK HDR 3POS 90DEG 5MM	3
1809306 Phoenix Contact	TERM BLOCK HDR 6POS VERT 5.08MM	0
1852215 Phoenix Contact	TERM BLOCK PLUG 6POS STR 3.81MM	14
1851203 Phoenix Contact	TERM BLOCK PLUG 18POS STR 3.81MM	50
TS08515C0000G Anytek (Amphenol Anytek)	TERM BLOCK PLUG 8POS 5.08MM	1315
1832536 Phoenix Contact	TERM BLOCK PLUG 3POS 7.62MM	1711150
691340500012 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	47
0395321004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 5.08MM	0
1841909 Phoenix Contact	TERM BLOCK PLUG 3POS STR 3.5MM	7

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