Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1776715 Phoenix Contact	TERM BLOCK HDR 4POS 90DEG 5MM	250
1792427 Phoenix Contact	TERM BLOCK PLUG 20POS 5.08MM	39
1755745 Phoenix Contact	TERM BLOCK PLUG 3POS 90DEG 5MM	275
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
1832536 Phoenix Contact	TERM BLOCK PLUG 3POS 7.62MM	1711150
1841909 Phoenix Contact	TERM BLOCK PLUG 3POS STR 3.5MM	7
1934887 Phoenix Contact	TERM BLOCK PLUG 4POS 90DEG 5MM	18665750
5448640 Phoenix Contact	TERM BLOCK PLUG 5POS STR 5.08MM	81
1717019 Phoenix Contact	TERM BLOCK HEADER 7.62MM 5POS	49
1924017 Phoenix Contact	TERM BLOCK HDR 6POS 90DEG 5MM	25
1738788 Phoenix Contact	TERM BLOCK HDR 4POS VERT 5.08MM	0
1784855 Phoenix Contact	TERM BLOCK PLUG 2POS STR 15MM	32
1755927 Phoenix Contact	TERM BLOCK HDR 21POS VERT 5.08MM	45
5435721 Phoenix Contact	TERM BLOCK PLUG 2POS STR 5.08MM	36
1755664 Phoenix Contact	TERM BLOCK PLUG 10POS 90DEG 5MM	1583000
1998988 Phoenix Contact	TERM BLOCK HDR 7POS 10.16MM	0
5442594 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 5.08MM	114
1841899 Phoenix Contact	TERM BLOCK HDR 5POS 90DEG 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