Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1SNK805731R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	30
1SNK806723R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	20
1SNK805720R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	20
1SNK805724R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	50
1SNK806714R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	96
1SNK806732R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	10
1SNK806712R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	138
1SNK805714R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	147
1SNK805744R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	100
1SNK806730R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	20
1SNK805728R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	30
1SNK805717R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	40
1SNK806720R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	20
1SNK806729R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	30
1SNK805748R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	100
1SNK806727R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	50
1SNK805738R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	100
1SNK805737R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	10
1SNK806735R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	15
1SNK805749R0000 TE Connectivity's Sigma Inductors	AUT SNK PLUGGABLE	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