Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1776980 Phoenix Contact	TERM BLOCK HDR 12POS VERT 5MM	43
OSTTS14515A On-Shore Technology, Inc.	TERM BLOCK PLUG 14POS 5.08MM	349
5444327 Phoenix Contact	TERM BLOCK HDR 8POS 90DEG 3.81MM	27
691348400006 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, VER	109
OQ0571500000G Anytek (Amphenol Anytek)	TERM BLOCK HDR 5POS VERT 5MM	1860
36.304 Altech Corporation	TERM BLOCK PLUG 4POS 3.81MM	160700
0395077008 Woodhead - Molex	TERM BLOCK PLUG 8POS 3.5MM	666
691304100007 Würth Elektronik Midcom	WR-TBL SERIES 3041_3.50 MM_SCREW	444
XW4M-04D2-H1DS Omron Electronics Components	PLUG,DOUBLE-ROW,RIGHT-ANGLE,TIN	0
1787137 Phoenix Contact	TERM BLOCK HDR 28POS 90DEG 3.5MM	26
1709453 Phoenix Contact	TERM BLOCK PLUG 5POS STR 2.5MM	551
1922640 Phoenix Contact	TERM BLOCK PLUG 3POS 10.16MM	0
1827949 Phoenix Contact	TERM BLOCK HDR 10POS 3.81MM	523100
1946270000 Weidmuller	TERM BLOCK PLUG 4POS 5.08MM	149
1792562 Phoenix Contact	TERM BLOCK PLUG 7POS STR 5.08MM	0
1853049 Phoenix Contact	TERM BLOCK PLUG 5POS STR 5.08MM	0
1984154 Phoenix Contact	TERM BLOCK PLUG 16POS 3.5MM	0
691351700005 Würth Elektronik Midcom	TERM BLOCK PLUG 5POS 5MM	88
691373500022B Würth Elektronik Midcom	TERM BLOCK PLUG 22POS STR 5.08MM	0
1-1986692-5 TE Connectivity AMP Connectors	TERM BLOCK PLUG 15POS STR 3.5MM	0

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