Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395100007 Woodhead - Molex	TERM BLOCK PLUG 7POS STR 3.81MM	794
0395100003 Woodhead - Molex	TERM BLOCK PLUG 3POS STR 3.81MM	4544
0395005011 Woodhead - Molex	TERM BLOCK PLUG 11POS STR 3.5MM	0
0395011008 Woodhead - Molex	TERM BLOCK HDR 8POS VERT 3.5MM	1497
0395205002 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 5MM	2072
0395211010 Woodhead - Molex	TERM BLOCK HDR 10POS VERT 5MM	256
0395245005 Woodhead - Molex	TERM BLOCK PLUG 5POS STR 5MM	539
0395000018 Woodhead - Molex	TERM BLOCK PLUG 18POS STR 3.5MM	22
0395277006 Woodhead - Molex	TERM BLOCK PLUG 6POS 270DEG 5MM	648
0395350002 Woodhead - Molex	TERM BLOCK HDR 2POS VERT 5.08MM	4187
0395061002 Woodhead - Molex	TERM BLOCK HDR 2POS 90DEG 3.5MM	2392
0395045011 Woodhead - Molex	TERM BLOCK PLUG 11POS STR 3.5MM	594
0395200012 Woodhead - Molex	TERM BLOCK PLUG 12POS STR 5MM	74
0395205012 Woodhead - Molex	TERM BLOCK PLUG 12POS STR 5MM	76
0395326008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 5.08MM	836
0395237007 Woodhead - Molex	TERM BLOCK PLUG 7POS 270DEG 5MM	448
0395337006 Woodhead - Molex	TERM BLOCK PLUG 6POS 5.08MM	329
0395337007 Woodhead - Molex	TERM BLOCK PLUG 7POS 5.08MM	439
0395325008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 5.08MM	2090
0395278003 Woodhead - Molex	TERM BLOCK PLUG 3POS 90DEG 5MM	1080

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