Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1933325 Phoenix Contact	TERM BLOCK HDR 16POS VERT 5MM	251050
1787357 Phoenix Contact	TERM BLOCK HDR 34POS VERT 3.5MM	40
1786213 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5.08MM	317
1804849 Phoenix Contact	TERM BLOCK HDR 7POS 90DEG 7.62MM	48
1952306 Phoenix Contact	TERM BLOCK PLUG 6POS STR 3.5MM	2552950
1861028 Phoenix Contact	TERM BLOCK HDR 3POS 90DEG 5MM	46
1826681 Phoenix Contact	TERM BLOCK PLUG 5POS STR 5MM	10
1803387 Phoenix Contact	TERM BLOCK HDR 13POS 3.81MM	157
1809335 Phoenix Contact	TERM BLOCK HDR 9POS VERT 5.08MM	0
1084020 Phoenix Contact	PCB CONNECTOR, NUMBER OF POSITIO	10030
1881422 Phoenix Contact	TERM BLOCK PLUG 12POS STR 2.5MM	811700
1909731 Phoenix Contact	TERM BLOCK PLUG 4POS STR 5MM	10050
1717138 Phoenix Contact	TERM BLOCK HEADER HYBRID 4+6POS	50
1787344 Phoenix Contact	TERM BLOCK HDR 32POS VERT 3.5MM	51
1766806 Phoenix Contact	TERM BLOCK HDR 5POS VERT 7.62MM	51
1830318 Phoenix Contact	TERM BLOCK HDR 16POS VERT 3.81MM	42
1776838 Phoenix Contact	TERM BLOCK HDR 16POS 90DEG 5MM	74
1720699 Phoenix Contact	TERM BLOCK HDR 3POS 90DEG 7.62MM	48
1900798 Phoenix Contact	TERM BLOCK PLUG 4POS STR 5.08MM	49
1845014 Phoenix Contact	TERM BLOCK HDR 32POS VERT 2.54MM	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