Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1781072 Phoenix Contact	TERM BLOCK PLUG 11POS STR 5.08MM	38
1779437 Phoenix Contact	TERM BLOCK PLUG 4POS STR 5MM	49
1873074 Phoenix Contact	TERM BLOCK PLUG 4POS STR 5.08MM	1701
2202232 Phoenix Contact	TERM BLOCK HDR 18POS 90DEG	0
1754766 Phoenix Contact	TERM BLOCK PLUG 18POS STR 5MM	88
3043200 Phoenix Contact	TERM BLOCK PLUG 1/2POS STR	139
1827033 Phoenix Contact	TERM BLOCK PLUG 8POS 3.81MM	2971400
1803691 Phoenix Contact	TERM BLOCK PLUG 14POS STR 3.81MM	49200
1776537 Phoenix Contact	TERM BLOCK HDR 5POS 90DEG 5.08MM	368
1755635 Phoenix Contact	TERM BLOCK PLUG 7POS 90DEG 5MM	101
1731620 Phoenix Contact	TERM BLOCK HDR 16POS VERT 3.5MM	50
1720851 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 7.62MM	0
1084034 Phoenix Contact	PCB CONNECTOR, NUMBER OF POSITIO	86
1847327 Phoenix Contact	TERM BLOCK HDR 12POS VERT 3.81MM	13
1944602 Phoenix Contact	TERM BLOCK HDR 3POS VERT 5MM	0
3240165 Phoenix Contact	TERM BLOCK PLUG 5POS STR	451
1788534 Phoenix Contact	TERM BLOCK HDR 3POS 90DEG 3.5MM	0
1718025 Phoenix Contact	TERM BLOCK PLUG 8POS STR 5MM	0
1755613 Phoenix Contact	TERM BLOCK HDR 13POS VERT 5MM	11
1736506 Phoenix Contact	TERM BLOCK PLUG 6POS 5.08MM	16

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