Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1821575 Phoenix Contact	TERM BLOCK HDR 5POS VERT 2.54MM	0
1779495 Phoenix Contact	TERM BLOCK PLUG 10POS STR 5MM	24
1840379 Phoenix Contact	TERM BLOCK PLUG 3POS STR 3.5MM	1584
1861662 Phoenix Contact	TERM BLOCK HDR 4POS 90DEG 3.81MM	55
1843664 Phoenix Contact	TERM BLOCK HDR 8POS VERT 3.5MM	21632600
1711394 Phoenix Contact	TERM BLOCK PLUG 4POS STR 10.16MM	215
1845137 Phoenix Contact	TERM BLOCK HDR 26POS 2.54MM	0
1757093 Phoenix Contact	TERM BLOCK PLUG 10POS STR 5.08MM	1928
1845390 Phoenix Contact	TERM BLOCK HDR 16POS VERT 5.08MM	12550
1861263 Phoenix Contact	CONN TERM BLOCK PLUG 5POS 5.08MM	73
1792711 Phoenix Contact	TERM BLOCK HDR 11POS 5.08MM	0
1894846 Phoenix Contact	TERM BLOCK HDR 12POS 90DEG 2.5MM	54
3040410 Phoenix Contact	TERM BLOCK PLUG 2/4POS STR	29
1830059 Phoenix Contact	TERM BLOCK HDR 24POS 3.81MM	7200
1776663 Phoenix Contact	TERM BLOCK HDR 18POS 5.08MM	16
1762486 Phoenix Contact	TERM BLOCK HDR 28POS 5.08MM	62
1756337 Phoenix Contact	TERM BLOCK PLUG 6POS STR 5MM	250
1720521 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 7.62MM	53
1808815 Phoenix Contact	TERM BLOCK PLUG 11POS STR 5.08MM	37
1969616 Phoenix Contact	TERM BLOCK HDR 2POS 10.16MM	50

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