Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1933312 Phoenix Contact	TERM BLOCK HDR 15POS VERT 5MM	0
1778829 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 2.5MM	1025
1836379 Phoenix Contact	CCA 2,5/ 5-G P20 THR	87
1786831 Phoenix Contact	TERM BLOCK PLUG 2POS STR 5MM	564800
1850893 Phoenix Contact	TERM BLOCK PLUG 6POS STR 3.81MM	50
1787195 Phoenix Contact	TERM BLOCK HDR 40POS 90DEG 3.5MM	7
1984316 Phoenix Contact	TERM BLOCK PLUG 2POS 90DEG 3.5MM	17987500
3043080 Phoenix Contact	TERM BLOCK PLUG 1POS STR	36
1734692 Phoenix Contact	TERM BLOCK PLUG 3POS STR 5.08MM	519
1717035 Phoenix Contact	TERM BLOCK HEADER 7.62MM 4POS	16
1926264 Phoenix Contact	TERM BLOCK PLUG 5POS STR 5MM	30
1755619 Phoenix Contact	TERM BLOCK PLUG 5POS 90DEG 5MM	468
1800781 Phoenix Contact	TERM BLOCK HDR 24POS VERT 5.08MM	0
1942154 Phoenix Contact	TERM BLOCK PLUG 2POS STR 5MM	4350
1845730 Phoenix Contact	TERM BLOCK HDR 24POS VERT 5.08MM	10
1806119 Phoenix Contact	TERM BLOCK PLUG 2POS STR 7.62MM	40
1753631 Phoenix Contact	TERM BLOCK HDR 12POS VERT 5MM	0
1778845 Phoenix Contact	TERM BLOCK PLUG 3POS STR 2.5MM	3156
1756256 Phoenix Contact	TERM BLOCK PLUG 2POS STR 5MM	1503950
1998263 Phoenix Contact	TERM BLOCK PLUG 3POS STR 5MM	99

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