Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395000710 Woodhead - Molex	TERM BLOCK PLUG 10POS STR 3.5MM	0
0395200009 Woodhead - Molex	TERM BLOCK PLUG 9POS STR 5MM	27
0395066010 Woodhead - Molex	TERM BLOCK HDR 10POS 90DEG 3.5MM	1343
0395340002 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 5.08MM	1052
0395045005 Woodhead - Molex	TERM BLOCK PLUG 5POS STR 3.5MM	327
0395000011 Woodhead - Molex	TERM BLOCK PLUG 11POS STR 3.5MM	216
0395311006 Woodhead - Molex	TERM BLOCK HDR 6POS VERT 5.08MM	384
0395300004 Woodhead - Molex	TERM BLOCK PLUG 4POS STR 5.08MM	0
0395316011 Woodhead - Molex	TERM BLOCK HDR 11POS VERT 5.08MM	690
0395045003 Woodhead - Molex	TERM BLOCK PLUG 3POS STR 3.5MM	3073
0395305006 Woodhead - Molex	TERM BLOCK PLUG 6POS STR 5.08MM	686
0395038006 Woodhead - Molex	TERM BLOCK PLUG 6POS 90DEG 3.5MM	234
0395277004 Woodhead - Molex	TERM BLOCK PLUG 4POS 270DEG 5MM	860
0395221004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 5MM	0
0395026012 Woodhead - Molex	TERM BLOCK HDR 12POS 90DEG 3.5MM	1368
0395066003 Woodhead - Molex	TERM BLOCK HDR 3POS 90DEG 3.5MM	2354
0395105002 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 3.81MM	3207
0395021007 Woodhead - Molex	TERM BLOCK HDR 7POS 90DEG 3.5MM	1115
0395078004 Woodhead - Molex	TERM BLOCK PLUG 4POS 90DEG 3.5MM	1077
0395225011 Woodhead - Molex	TERM BLOCK HDR 11POS 90DEG 5MM	720

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