Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
0395237003 Woodhead - Molex	TERM BLOCK PLUG 3POS 270DEG 5MM	790
XW4M-24D2-V1DS Omron Electronics Components	PLUG,DOUBLE-ROW,STRAIGHT,TIN REF	0
XW4N-16D1-A Omron Electronics Components	SOCKET,SINGLE-ROW,,GOLD,	0
1911965 Phoenix Contact	TERM BLOCK PLUG 2POS STR 5.08MM	1190
3045855 Phoenix Contact	TERM BLOCK PLUG 6POS 90DEG	0
1792605 Phoenix Contact	TERM BLOCK PLUG 10POS 270DEG 5MM	32
1827619 Phoenix Contact	TERM BLOCK HDR 2POS 90DEG 3.81MM	0
0395037007 Woodhead - Molex	TERM BLOCK PLUG 7POS 3.5MM	915
691322110004 Würth Elektronik Midcom	TERM BLOCK HDR 4POS 90DEG 3.5MM	3098
TS04715C0000G Anytek (Amphenol Anytek)	TERM BLOCK PLUG 4POS 90DEG 5MM	1205
TBP01P1W-508-08BE CUI Devices	TERMINAL BLOCK, PLUGGABLE, W SCR	249
1899480000 Weidmuller	TERM BLOCK PLUG 14POS STR 3.81MM	9850
1792702 Phoenix Contact	TERM BLOCK PLUG 20POS 270DEG 5MM	45
1728400000 Weidmuller	TERM BLOCK HDR 24POS 90DEG 3.5MM	0
1969890000 Weidmuller	TERM BLOCK PLUG 2POS STR 3.81MM	0
1740314 Phoenix Contact	TERM BLOCK HDR 10POS VERT 5MM	994
1745904 Phoenix Contact	TERM BLOCK PLUG 3POS STR 3.81MM	225250
1971830000 Weidmuller	TERM BLOCK PLUG 8POS STR 3.81MM	70
1840434 Phoenix Contact	TERM BLOCK PLUG 9POS STR 3.5MM	1229
1013480000 Weidmuller	TERM BLOCK PLUG 7POS STR 5.08MM	95

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