Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1759143 Phoenix Contact	TERM BLOCK HDR 15POS 5.08MM	51
1809747 Phoenix Contact	TERM BLOCK PLUG 3POS STR 5.08MM	95
1966091 Phoenix Contact	TERM BLOCK PLUG 2POS STR 3.5MM	136
1843305 Phoenix Contact	TERM BLOCK HDR 10POS VERT 3.5MM	0
1984109 Phoenix Contact	TERM BLOCK PLUG 11POS 3.5MM	98
1788525 Phoenix Contact	TERM BLOCK RCPT 20POS 5.08MM	4
1755558 Phoenix Contact	TERM BLOCK HDR 6POS VERT 5MM	1265011700
1805314 Phoenix Contact	TERM BLOCK PLUG 3POS STR 5.08MM	3391400
1924567 Phoenix Contact	TERM BLOCK HDR 6POS VERT 5.08MM	37050
1835119 Phoenix Contact	TERM BLOCK PLUG 4POS 5.08MM	524
1923979 Phoenix Contact	TERM BLOCK HDR 2POS 90DEG 5MM	100
1779365 Phoenix Contact	TERM BLOCK HDR 2POS VERT 3.5MM	384
3061693 Phoenix Contact	TERM BLOCK PLUG 1POS STR	0
1843855 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 3.5MM	66
1843198 Phoenix Contact	TERM BLOCK HDR 28POS 3.81MM	611100
1766563 Phoenix Contact	TERM BLOCK HDR 2POS VERT 7.62MM	67
5448268 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5MM	26
3212714 Phoenix Contact	TERM BLOCK PLUG 1POS STR	139
1787098 Phoenix Contact	TERM BLOCK HDR 20POS 90DEG 3.5MM	495
5442002 Phoenix Contact	TERM BLOCK HDR 2POS 90DEG 5.08MM	105

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