Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1778612 Phoenix Contact	TERM BLOCK HDR 8POS VERT 2.5MM	417
0395311007 Woodhead - Molex	TERM BLOCK HDR 7POS VERT 5.08MM	1726
691313510005 Würth Elektronik Midcom	TERM BLOCK HDR 5POS 90DEG 5.08MM	0
1946260000 Weidmuller	TERM BLOCK PLUG 3POS 5.08MM	120
0395265009 Woodhead - Molex	TERM BLOCK HDR 9POS 90DEG 5MM	720
1-796640-0 TE Connectivity AMP Connectors	TERM BLOCK PLUG 10POS STR 5MM	227
2350398-5 TE Connectivity AMP Connectors	5 POS SPRING TB PLUG PITCH 3.50	3434
1065130000 Weidmuller	TERM BLOCK PLUG 2POS STR 5.08MM	200
0395166004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 3.81MM	2858
1546019-5 TE Connectivity AMP Connectors	TERM BLOCK HDR 5POS VERT 5MM	0
1581360000 Weidmuller	TERM BLOCK HDR 6POS VERT 5MM	284
1621350000 Weidmuller	TERM BLOCK PLUG 24POS STR 3.5MM	16160
1720819 Phoenix Contact	TERM BLOCK HDR 4POS 90DEG 7.62MM	142
1731811 Phoenix Contact	TERM BLOCK HDR 16POS 90DEG 3.5MM	50
1757572 Phoenix Contact	TERM BLOCK HDR 13POS 90DEG 5MM	0
110-M-211/03 WECO Electrical Connectors	TERM BLK PCB; HEADER 90DEG ANGL	500
1830240 Phoenix Contact	TERM BLOCK HDR 32POS 3.81MM	0
ASP0450822 RIA Connect / METZ CONNECT	SPRING CLAMP TERMINAL BLOCK, PLU	149
1847945 Phoenix Contact	TERM BLOCK PLUG 8POS 7.62MM	16
EBPA-05-D Adam Tech	EURO BLOCK 5P	796

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