Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395350004 Woodhead - Molex	TERM BLOCK HDR 4POS VERT 5.08MM	1315
0395005007 Woodhead - Molex	TERM BLOCK PLUG 7POS STR 3.5MM	0
0395321008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 5.08MM	1039
0395011011 Woodhead - Molex	TERM BLOCK HDR 11POS VERT 3.5MM	0
0395326004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 5.08MM	1658
0395021002 Woodhead - Molex	TERM BLOCK HDR 2POS 90DEG 3.5MM	0
0395116005 Woodhead - Molex	TERM BLOCK HDR 5POS VERT 3.81MM	3218
0395320010 Woodhead - Molex	TERM BLOCK HDR 10POS 5.08MM	647
0395038010 Woodhead - Molex	TERM BLOCK PLUG 10POS 3.5MM	979
0395138010 Woodhead - Molex	TERM BLOCK PLUG 10POS 3.81MM	672
0395245002 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 5MM	2121
0395040003 Woodhead - Molex	TERM BLOCK PLUG 3POS STR 3.5MM	1159
0395345006 Woodhead - Molex	TERM BLOCK PLUG 6POS STR 5.08MM	494
0395237011 Woodhead - Molex	TERM BLOCK PLUG 11POS 270DEG 5MM	429
0395121010 Woodhead - Molex	TERM BLOCK HDR 10POS 3.81MM	504
0395300102 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 5.08MM	0
0395316009 Woodhead - Molex	TERM BLOCK HDR 9POS VERT 5.08MM	900
0395037003 Woodhead - Molex	TERM BLOCK PLUG 3POS 3.5MM	1111
0395215002 Woodhead - Molex	TERM BLOCK HDR 2POS VERT 5MM	3000
0395238011 Woodhead - Molex	TERM BLOCK PLUG 11POS 90DEG 5MM	220

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