Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395325007 Woodhead - Molex	TERM BLOCK HDR 7POS 90DEG 5.08MM	1181
0395000009 Woodhead - Molex	TERM BLOCK PLUG 9POS STR 3.5MM	0
0395145005 Woodhead - Molex	TERM BLOCK PLUG 5POS STR 3.81MM	559
0395032004 Woodhead - Molex	TERM BLOCK PLUG 4POS 3.5MM	2908
0395365004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 5.08MM	870
0395278008 Woodhead - Molex	TERM BLOCK PLUG 8POS 90DEG 5MM	270
0395077008 Woodhead - Molex	TERM BLOCK PLUG 8POS 3.5MM	666
0395338011 Woodhead - Molex	TERM BLOCK PLUG 11POS 5.08MM	427
0395221002 Woodhead - Molex	TERM BLOCK HDR 2POS 90DEG 5MM	672
0395300006 Woodhead - Molex	TERM BLOCK PLUG 6POS STR 5.08MM	1329
0393730002 Woodhead - Molex	TERM BLOCK HDR 2POS 90DEG 7.5MM	568
0395126004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 3.81MM	3882
0395066008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 3.5MM	1770
0395320008 Woodhead - Molex	TERM BLOCK HDR 8POS 90DEG 5.08MM	0
0395156005 Woodhead - Molex	TERM BLOCK HDR 5POS VERT 3.81MM	2300
0395337009 Woodhead - Molex	TERM BLOCK PLUG 9POS 5.08MM	425
0395237003 Woodhead - Molex	TERM BLOCK PLUG 3POS 270DEG 5MM	790
0395037007 Woodhead - Molex	TERM BLOCK PLUG 7POS 3.5MM	915
0395100002 Woodhead - Molex	TERM BLOCK PLUG 2POS STR 3.81MM	3898
0395172004 Woodhead - Molex	TERM BLOCK PLUG 4POS 3.81MM	1908

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