Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395300002 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 5.08MM	0
0395132005 Woodhead - Molex	TERM BLOCK PLUG 5POS 3.81MM	1505
0395216006 Woodhead - Molex	TERM BLOCK HDR 6POS VERT 5MM	1184
0395026011 Woodhead - Molex	TERM BLOCK HDR 11POS 90DEG 3.5MM	1566
0395200003 Woodhead - Molex	TERM BLOCK PLUG 3POS STR 5MM	2581
0395000019 Woodhead - Molex	TERM BLOCK PLUG 19POS STR 3.5MM	0
0395200005 Woodhead - Molex	TERM BLOCK PLUG 5POS STR 5MM	0
0395265008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 5MM	1310
0395138008 Woodhead - Molex	TERM BLOCK PLUG 8POS 3.81MM	550
0394210002 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 12MM	53
0395338012 Woodhead - Molex	TERM BLOCK PLUG 12POS 5.08MM	407
0395278007 Woodhead - Molex	TERM BLOCK PLUG 7POS 90DEG 5MM	540
0395278006 Woodhead - Molex	TERM BLOCK PLUG 6POS 90DEG 5MM	864
0395077009 Woodhead - Molex	TERM BLOCK PLUG 9POS 3.5MM	1296
0395126005 Woodhead - Molex	TERM BLOCK HDR 5POS 90DEG 3.81MM	1928
0395011014 Woodhead - Molex	TERM BLOCK HDR 14POS VERT 3.5MM	629
0395355004 Woodhead - Molex	TERM BLOCK HDR 4POS VERT 5.08MM	1500
0395111007 Woodhead - Molex	TERM BLOCK HDR 7POS VERT 3.81MM	1925
0395026010 Woodhead - Molex	TERM BLOCK HDR 10POS 90DEG 3.5MM	1384
0395215008 Woodhead - Molex	TERM BLOCK HDR 8POS VERT 5MM	799

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