Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395237002 Woodhead - Molex	TERM BLOCK PLUG 2POS 270DEG 5MM	1268
0395305111 Woodhead - Molex	TERM BLOCK PLUG 11POS STR 5.08MM	508
0395100005 Woodhead - Molex	TERM BLOCK PLUG 5POS STR 3.81MM	1340
0395105005 Woodhead - Molex	TERM BLOCK PLUG 5POS STR 3.81MM	851
0395078003 Woodhead - Molex	TERM BLOCK PLUG 3POS 90DEG 3.5MM	1363
0395326003 Woodhead - Molex	TERM BLOCK HDR 3POS 90DEG 5.08MM	116
0395221005 Woodhead - Molex	TERM BLOCK HDR 5POS 90DEG 5MM	0
0395011013 Woodhead - Molex	TERM BLOCK HDR 13POS VERT 3.5MM	1834
0395021010 Woodhead - Molex	TERM BLOCK HDR 10POS 90DEG 3.5MM	2135
0395111002 Woodhead - Molex	TERM BLOCK HDR 2POS VERT 3.81MM	2017
0395305003 Woodhead - Molex	TERM BLOCK PLUG 3POS STR 5.08MM	614
0395278002 Woodhead - Molex	TERM BLOCK PLUG 2POS 90DEG 5MM	1248
0395326002 Woodhead - Molex	TERM BLOCK HDR 2POS 90DEG 5.08MM	444
0395225004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 5MM	2146
0395121016 Woodhead - Molex	TERM BLOCK HDR 16POS 3.81MM	117
0394250004 Woodhead - Molex	TERM BLOCK HDR 4POS 90DEG 12MM	222
0395032005 Woodhead - Molex	TERM BLOCK PLUG 5POS 3.5MM	961
0395011004 Woodhead - Molex	TERM BLOCK HDR 4POS VERT 3.5MM	0
0395325006 Woodhead - Molex	TERM BLOCK HDR 6POS 90DEG 5.08MM	1481
0395333004 Woodhead - Molex	TERM BLOCK PLUG 4POS 5.08MM	266

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