Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1795006 Phoenix Contact	TERM BLOCK HDR 7POS VERT 5MM	14
691309310012 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, V	166
691305530004 Würth Elektronik Midcom	WR-TBL SERIES 3055_5.08 MM_PCB H	0
2-1986722-1 TE Connectivity AMP Connectors	TERM BLOCK PLUG 21POS STR 3.81MM	0
1792546 Phoenix Contact	TERM BLOCK PLUG 5POS STR 5.08MM	0
1716400000 Weidmuller	TERM BLOCK PLUG 10POS STR 5.08MM	16150
1786950 Phoenix Contact	TERM BLOCK HDR 28POS 90DEG 3.5MM	50
TJ1071570000G Anytek (Amphenol Anytek)	TERM BLOCK PLUG 10POS STR 5MM	0
OSTOQ045551 On-Shore Technology, Inc.	TERM BLOCK HDR 4POS 90DEG 5.08MM	21
691385700015 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK PLUG, HOR	24
XW4M-09D1-V1DS Omron Electronics Components	PLUG,SINGLE-ROW,STRAIGHT,TIN REF	0
691322310009 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	674
TS04515A0000G Anytek (Amphenol Anytek)	TERM BLOCK PLUG 4POS 5.08MM	2402
691307300005 Würth Elektronik Midcom	TERM BLOCK HDR 5POS VERT 3.81MM	280
1852189 Phoenix Contact	TERM BLOCK PLUG 3POS STR 3.81MM	16
1-1986723-5 TE Connectivity AMP Connectors	TERM BLOCK PLUG 15POS STR 3.5MM	0
1727700000 Weidmuller	TERM BLOCK PLUG 18POS STR 3.5MM	4454
OSTOQ103251 On-Shore Technology, Inc.	TERM BLOCK HDR 10POS 3.81MM	6329
1962037 Phoenix Contact	TERM BLOCK HDR 2POS 90DEG 5.08MM	465
1862881 Phoenix Contact	TERM BLOCK PLUG 5POS 3.5MM	2064400

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