Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1967443 Phoenix Contact	TERM BLOCK PLUG 9POS STR 10.16MM	0
1766770 Phoenix Contact	TERM BLOCK HDR 2POS VERT 7.62MM	1486
1857964 Phoenix Contact	TERM BLOCK PLUG 10POS STR 3.81MM	0
1808983 Phoenix Contact	TERM BLOCK PLUG 12POS STR 5.08MM	0
1844811 Phoenix Contact	TERM BLOCK HDR 22POS 2.54MM	0
1853036 Phoenix Contact	TERM BLOCK PLUG 4POS STR 5.08MM	41
1863084 Phoenix Contact	TERM BLOCK PLUG 10POS 3.5MM	38
1952348 Phoenix Contact	TERM BLOCK PLUG 10POS STR 3.5MM	212900
1755888 Phoenix Contact	TERM BLOCK HDR 17POS VERT 5.08MM	5
1790412 Phoenix Contact	TERM BLOCK PLUG 28POS STR 3.5MM	24
1861250 Phoenix Contact	CONN TERM BLOCK PLUG 4POS 5.08MM	80
1976010 Phoenix Contact	TERM BLOCK PLUG 3POS STR 5.08MM	4
1858882 Phoenix Contact	TERM BLOCK PLUG 3POS STR 7.62MM	9
1788444 Phoenix Contact	TERM BLOCK RCPT 12POS 5.08MM	3
1851038 Phoenix Contact	TERM BLOCK PLUG 20POS STR 3.81MM	16
1953790 Phoenix Contact	TERM BLOCK HDR 20POS 90DEG 3.5MM	294
1792294 Phoenix Contact	TERM BLOCK PLUG 7POS 5.08MM	831450
5430506 Phoenix Contact	TERM BLOCK HDR 10POS 90DEG 3.5MM	300
1808832 Phoenix Contact	TERM BLOCK PLUG 4POS STR 5.08MM	150515700
1827761 Phoenix Contact	TERM BLOCK PLUG 8POS STR 3.81MM	10112200

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