Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1740990 Phoenix Contact	TERM BLOCK HDR 16POS VERT 5.08MM	65
1757297 Phoenix Contact	TERM BLOCK HDR 7POS 90DEG 5.08MM	9921000
5434544 Phoenix Contact	TERM BLOCK PLUG 2POS STR 3.5MM	34
3061622 Phoenix Contact	TERM BLOCK PLUG 7POS STR	325
1740275 Phoenix Contact	TERM BLOCK HDR 5POS VERT 5.08MM	199
1850686 Phoenix Contact	TERM BLOCK PLUG 4POS STR 3.81MM	33
1767623 Phoenix Contact	TERM BLOCK PLUG 5POS STR 3.5MM	32
1924363 Phoenix Contact	TERM BLOCK HDR 8POS VERT 5.08MM	994
1894655 Phoenix Contact	TERM BLOCK PLUG 2POS STR 3.5MM	4841600
1808858 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5.08MM	746100
1830402 Phoenix Contact	TERM BLOCK HDR 4POS VERT 3.81MM	58
1779709 Phoenix Contact	TERM BLOCK PLUG 8POS STR 5MM	23
1781108 Phoenix Contact	TERM BLOCK PLUG 14POS STR 5.08MM	51
1861771 Phoenix Contact	CONN TERM BLOCK PLG 10POS 5.08MM	100
1939921 Phoenix Contact	TERM BLOCK PLUG 3POS STR 3.5MM	27
1805987 Phoenix Contact	TERM BLOCK PLUG 2POS STR 7.62MM	47
1881626 Phoenix Contact	TERM BLOCK HDR 9POS VERT 2.5MM	1
1912223 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5.08MM	7
5433697 Phoenix Contact	TERM BLOCK HDR 5POS 90DEG 5.08MM	5
1840133 Phoenix Contact	TERM BLOCK PLUG 8POS STR 7.62MM	50

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