Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395000006 Woodhead - Molex	TERM BLOCK PLUG 6POS STR 3.5MM	0
0395038005 Woodhead - Molex	TERM BLOCK PLUG 5POS 90DEG 3.5MM	1438
0395238009 Woodhead - Molex	TERM BLOCK PLUG 9POS 90DEG 5MM	270
0395300116 Woodhead - Molex	TERM BLOCK PLUG 16POS STR 5.08MM	1288
0395021005 Woodhead - Molex	TERM BLOCK HDR 5POS 90DEG 3.5MM	2329
0395321009 Woodhead - Molex	TERM BLOCK HDR 9POS 90DEG 5.08MM	329
0395365009 Woodhead - Molex	TERM BLOCK HDR 9POS 90DEG 5.08MM	720
0395021013 Woodhead - Molex	TERM BLOCK HDR 13POS 90DEG 3.5MM	291
0395305002 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 5.08MM	1150
0395300114 Woodhead - Molex	TERM BLOCK PLUG 14POS STR 5.08MM	0
0395178003 Woodhead - Molex	TERM BLOCK PLUG 3POS 3.81MM	2160
0395037012 Woodhead - Molex	TERM BLOCK PLUG 12POS 3.5MM	706
0395316012 Woodhead - Molex	TERM BLOCK HDR 12POS VERT 5.08MM	720
0395326009 Woodhead - Molex	TERM BLOCK HDR 9POS 90DEG 5.08MM	814
0395365012 Woodhead - Molex	TERM BLOCK HDR 12POS 5.08MM	600
0395138009 Woodhead - Molex	TERM BLOCK PLUG 9POS 3.81MM	124
0395205010 Woodhead - Molex	TERM BLOCK PLUG 10POS STR 5MM	393
0395221007 Woodhead - Molex	TERM BLOCK HDR 7POS 90DEG 5MM	0
0395225007 Woodhead - Molex	TERM BLOCK HDR 7POS 90DEG 5MM	1200
0395033010 Woodhead - Molex	TERM BLOCK PLUG 10POS 3.5MM	439

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