Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395277007 Woodhead - Molex	TERM BLOCK PLUG 7POS 270DEG 5MM	540
0395300113 Woodhead - Molex	TERM BLOCK PLUG 13POS STR 5.08MM	288
0395137008 Woodhead - Molex	TERM BLOCK PLUG 8POS 3.81MM	824
0395225010 Woodhead - Molex	TERM BLOCK HDR 10POS 90DEG 5MM	721
0395000017 Woodhead - Molex	TERM BLOCK PLUG 17POS STR 3.5MM	0
0395265003 Woodhead - Molex	TERM BLOCK HDR 3POS 90DEG 5MM	960
0395237008 Woodhead - Molex	TERM BLOCK PLUG 8POS 270DEG 5MM	428
0395377012 Woodhead - Molex	TERM BLOCK PLUG 12POS 5.08MM	360
0395116008 Woodhead - Molex	TERM BLOCK HDR 8POS VERT 3.81MM	1962
0395300003 Woodhead - Molex	TERM BLOCK PLUG 3POS STR 5.08MM	339
0395305008 Woodhead - Molex	TERM BLOCK PLUG 8POS STR 5.08MM	898
0395277005 Woodhead - Molex	TERM BLOCK PLUG 5POS 270DEG 5MM	642
0395355007 Woodhead - Molex	TERM BLOCK HDR 7POS VERT 5.08MM	900
0395215010 Woodhead - Molex	TERM BLOCK HDR 10POS VERT 5MM	810
0395156004 Woodhead - Molex	TERM BLOCK HDR 4POS VERT 3.81MM	2868
0395172002 Woodhead - Molex	TERM BLOCK PLUG 2POS 3.81MM	3448
0395021019 Woodhead - Molex	TERM BLOCK HDR 19POS 90DEG 3.5MM	26
0395016002 Woodhead - Molex	TERM BLOCK HDR 2POS VERT 3.5MM	3846
0393710004 Woodhead - Molex	TERM BLOCK PLUG 4POS STR 7.5MM	622
0395078008 Woodhead - Molex	TERM BLOCK PLUG 8POS 90DEG 3.5MM	672

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