Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395211006 Woodhead - Molex	TERM BLOCK HDR 6POS VERT 5MM	234
0395215006 Woodhead - Molex	TERM BLOCK HDR 6POS VERT 5MM	1500
0395315012 Woodhead - Molex	TERM BLOCK HDR 12POS VERT 5.08MM	720
0395265012 Woodhead - Molex	TERM BLOCK HDR 12POS 90DEG 5MM	600
0395105007 Woodhead - Molex	TERM BLOCK PLUG 7POS STR 3.81MM	887
0395045006 Woodhead - Molex	TERM BLOCK PLUG 6POS STR 3.5MM	958
0395051002 Woodhead - Molex	TERM BLOCK HDR 2POS VERT 3.5MM	2560
0395378002 Woodhead - Molex	TERM BLOCK PLUG 2POS 5.08MM	1296
0395011017 Woodhead - Molex	TERM BLOCK HDR 17POS VERT 3.5MM	0
0395237004 Woodhead - Molex	TERM BLOCK PLUG 4POS 270DEG 5MM	190
0395245010 Woodhead - Molex	TERM BLOCK PLUG 10POS STR 5MM	338
0395216009 Woodhead - Molex	TERM BLOCK HDR 9POS VERT 5MM	895
0395338008 Woodhead - Molex	TERM BLOCK PLUG 8POS 5.08MM	310
0395066011 Woodhead - Molex	TERM BLOCK HDR 11POS 90DEG 3.5MM	1404
0395255012 Woodhead - Molex	TERM BLOCK HDR 12POS VERT 5MM	600
0395037011 Woodhead - Molex	TERM BLOCK PLUG 11POS 3.5MM	755
0395077004 Woodhead - Molex	TERM BLOCK PLUG 4POS 3.5MM	1079
0395111004 Woodhead - Molex	TERM BLOCK HDR 4POS VERT 3.81MM	1228
0395200008 Woodhead - Molex	TERM BLOCK PLUG 8POS STR 5MM	282
0395221009 Woodhead - Molex	TERM BLOCK HDR 9POS 90DEG 5MM	3

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