Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395077011 Woodhead - Molex	TERM BLOCK PLUG 11POS 3.5MM	504
0395377009 Woodhead - Molex	TERM BLOCK PLUG 9POS 5.08MM	432
0395037004 Woodhead - Molex	TERM BLOCK PLUG 4POS 3.5MM	651
0395311012 Woodhead - Molex	TERM BLOCK HDR 12POS VERT 5.08MM	0
0395265005 Woodhead - Molex	TERM BLOCK HDR 5POS 90DEG 5MM	1200
0395364003 Woodhead - Molex	TERM BLOCK HDR 3POS 90DEG 5.08MM	0
0395032002 Woodhead - Molex	TERM BLOCK PLUG 2POS 3.5MM	0
0395320005 Woodhead - Molex	TERM BLOCK HDR 5POS 90DEG 5.08MM	1758
0395255006 Woodhead - Molex	TERM BLOCK HDR 6POS VERT 5MM	1080
0395078005 Woodhead - Molex	TERM BLOCK PLUG 5POS 90DEG 3.5MM	1725
0395111003 Woodhead - Molex	TERM BLOCK HDR 3POS VERT 3.81MM	3049
0395038003 Woodhead - Molex	TERM BLOCK PLUG 3POS 90DEG 3.5MM	14261500
0395032007 Woodhead - Molex	TERM BLOCK PLUG 7POS 3.5MM	1205
0395178002 Woodhead - Molex	TERM BLOCK PLUG 2POS 3.81MM	3564
0395200002 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 5MM	0
0395177007 Woodhead - Molex	TERM BLOCK PLUG 7POS 3.81MM	1295
0395000010 Woodhead - Molex	TERM BLOCK PLUG 10POS STR 3.5MM	966
0395116009 Woodhead - Molex	TERM BLOCK HDR 9POS VERT 3.81MM	1741
0395300010 Woodhead - Molex	TERM BLOCK PLUG 10POS STR 5.08MM	682
0395140006 Woodhead - Molex	TERM BLOCK PLUG 6POS STR 3.81MM	497

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