Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1707528 Phoenix Contact	TERM BLOCK HDR 12POS VERT 3.81MM	0
1834945 Phoenix Contact	TERM BLOCK PLUG 6POS 5.08MM	19100
1755587 Phoenix Contact	TERM BLOCK HDR 9POS VERT 5MM	146
5452235 Phoenix Contact	TERM BLOCK PLUG 2POS STR 5.08MM	100
1779974 Phoenix Contact	TERM BLOCK PLUG 16POS STR 5MM	0
1924554 Phoenix Contact	TERM BLOCK HDR 5POS VERT 5.08MM	0
3042340 Phoenix Contact	TERM BLOCK RCPT 1POS STR	150
1717003 Phoenix Contact	TERM BLOCK PLUG HYBRID 5+4POS	24
1709462 Phoenix Contact	TERM BLOCK PLUG 5POS STR 2.5MM	272
5441977 Phoenix Contact	TERM BLOCK PLUG 3POS STR 5.08MM	102
1766246 Phoenix Contact	TERM BLOCK HDR 3POS 90DEG 7.62MM	152000
3211965 Phoenix Contact	TERM BLOCK PLUG 1POS 90DEG	41
1967375 Phoenix Contact	TERM BLOCK PLUG 2POS STR 10.16MM	294900
1787014 Phoenix Contact	TERM BLOCK HDR 4POS 90DEG 3.5MM	0
1875140 Phoenix Contact	TERM BLOCK PLUG 6POS STR 7.62MM	0
1911897 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5MM	0
1757271 Phoenix Contact	TERM BLOCK HDR 5POS 90DEG 5.08MM	28701750
1779932 Phoenix Contact	TERM BLOCK PLUG 12POS STR 5MM	23
1753738 Phoenix Contact	TERM BLOCK HDR 17POS VERT 5MM	34
1830101 Phoenix Contact	TERM BLOCK HDR 4POS 90DEG 3.81MM	35

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