Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
EDZ1200/5 On-Shore Technology, Inc.	TERM BLOCK PLUG 5POS STR 5.08MM	0
2201789 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG	60
1828540 Phoenix Contact	TERM BLOCK PLUG 7POS 3.81MM	25
1986160-3 TE Connectivity AMP Connectors	TERM BLOCK PLUG 3POS STR 5.08MM	0
1847893 Phoenix Contact	TERM BLOCK PLUG 3POS 7.62MM	50
ED1100/12 On-Shore Technology, Inc.	TERM BLOCK PLUG 12POS 90DEG 5MM	0
1927221 Phoenix Contact	TERM BLOCK PLUG 4POS 7.62MM	0
1833069 Phoenix Contact	TERM BLOCK RCPT 6POS 3.81MM	144
1235800000 Weidmuller	TERM BLOCK PLUG 6POS STR 3.81MM	100
1954951 Phoenix Contact	TERM BLOCK HDR 6POS 90DEG 5.08MM	33
691373500010B Würth Elektronik Midcom	TERM BLOCK PLUG 10POS STR 5.08MM	0
1767106 Phoenix Contact	TERM BLOCK PLUG 12POS STR 7.62MM	32
691305130007 Würth Elektronik Midcom	TERM BLOCK HDR 7POS VERT 3.5MM	95
31017107 RIA Connect / METZ CONNECT	PIN HEADER, VERTICAL, THR, PCB,	970
3043187 Phoenix Contact	TERM BLOCK PLUG 1POS STR	0
691321100002 Würth Elektronik Midcom	TERM BLOCK HDR 2POS VERT 3.5MM	0
1787111 Phoenix Contact	TERM BLOCK HDR 24POS 90DEG 3.5MM	557
691348500012 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, VER	47
1760051 Phoenix Contact	TERM BLOCK HDR 8POS VERT 5.08MM	40
1971590000 Weidmuller	TERM BLOCK PLUG 4POS STR 3.81MM	100

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