Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395321002 Woodhead - Molex	TERM BLOCK HDR 2POS 90DEG 5.08MM	1065
0395321006 Woodhead - Molex	TERM BLOCK HDR 6POS 90DEG 5.08MM	663
0395225005 Woodhead - Molex	TERM BLOCK HDR 5POS 90DEG 5MM	1699
0395333003 Woodhead - Molex	TERM BLOCK PLUG 3POS 5.08MM	694
0395011006 Woodhead - Molex	TERM BLOCK HDR 6POS VERT 3.5MM	12140
0395237012 Woodhead - Molex	TERM BLOCK PLUG 12POS 270DEG 5MM	416
0395338010 Woodhead - Molex	TERM BLOCK PLUG 10POS 5.08MM	538
0395105010 Woodhead - Molex	TERM BLOCK PLUG 10POS STR 3.81MM	704
0395066006 Woodhead - Molex	TERM BLOCK HDR 6POS 90DEG 3.5MM	2260
0395365002 Woodhead - Molex	TERM BLOCK HDR 2POS 90DEG 5.08MM	2145
0395210004 Woodhead - Molex	TERM BLOCK HDR 4POS VERT 5MM	4169
0395255007 Woodhead - Molex	TERM BLOCK HDR 7POS VERT 5MM	900
0395178011 Woodhead - Molex	TERM BLOCK PLUG 11POS 3.81MM	540
0395245004 Woodhead - Molex	TERM BLOCK PLUG 4POS STR 5MM	709
0395373008 Woodhead - Molex	TERM BLOCK PLUG 8POS 5.08MM	0
0395333006 Woodhead - Molex	TERM BLOCK PLUG 6POS 5.08MM	538
0395021003 Woodhead - Molex	TERM BLOCK HDR 3POS 90DEG 3.5MM	4801
0399400404 Woodhead - Molex	TERM BLOCK PLUG 4POS 5.08MM	224
0395215004 Woodhead - Molex	TERM BLOCK HDR 4POS VERT 5MM	2150
0395126009 Woodhead - Molex	TERM BLOCK HDR 9POS 90DEG 3.81MM	1701

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