Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691365110004 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, HOR	284
1908127 Phoenix Contact	TERM BLOCK PLUG 6POS STR 7.62MM	0
1805546 Phoenix Contact	TERM BLOCK PLUG 5POS 90DEG 5MM	206
1614200000 Weidmuller	TERM BLOCK HDR 8POS 90DEG 3.5MM	28
1615700000 Weidmuller	TERM BLOCK PLUG 8POS STR 3.5MM	485
1717025 Phoenix Contact	TERM BLOCK HEADER 7.62MM 2POS	44
EDSTL950/20 On-Shore Technology, Inc.	TERM BLOCK HDR 20POS 90DEG 5MM	34
1798750000 Weidmuller	TERM BLOCK PLUG 10POS 3.81MM	0
1787564 Phoenix Contact	TERM BLOCK HDR 38POS VERT 3.5MM	49
1759075 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 5.08MM	6072500
31049102 RIA Connect / METZ CONNECT	SCREW TYPE TERMINAL BLOCK, PLUG,	466
OSTOQ047051 On-Shore Technology, Inc.	TERM BLOCK HDR 4POS 90DEG 5MM	5768
691323300002 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	803
OQ0375500000G Anytek (Amphenol Anytek)	TERM BLOCK HDR 3POS VERT 5MM	0
1766262 Phoenix Contact	TERM BLOCK HDR 5POS 90DEG 7.62MM	165
EBJA-03-C-BK Adam Tech	EURO BLOCK, 3 POSITION	514
1986692-2 TE Connectivity AMP Connectors	TERM BLOCK PLUG 2POS STR 3.5MM	0
1844278 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 3.5MM	8513900
1757349 Phoenix Contact	TERM BLOCK HDR 12POS 5.08MM	17132850
25-E1300-02 NTE Electronics, Inc.	TERMINAL BLOCK EUROSTYLE	64

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