Terminal Blocks - Wire to Board

Part Number	Description / PDF	Quantity
691249610002 Würth Elektronik Midcom	TERM BLK 2P SIDE ENT 10.16MM PCB	0
691253610002 Würth Elektronik Midcom	10.16 MM TERMINAL BLOCK, HORIZON	400
691242610003 Würth Elektronik Midcom	10.16 MM TERMINAL BLOCK, HORIZON	200
691242600003 Würth Elektronik Midcom	10.16 MM TERMINAL BLOCK, VERTICA	200
691241710006 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	392
691104800001 Würth Elektronik Midcom	TERM BLOCK 1POS TOP ENTRY PCB	0
691417420006 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK, 45 ENTR	99
691216600002 Würth Elektronik Midcom	TERM BLK 2P TOP ENT 10.16MM PCB	0
691242700007 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, VERTICAL	94
691403900002B Würth Elektronik Midcom	2.54 MM TERMINAL BLOCK, VERTICAL	328
691136700008 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, VERTICAL	100
691218410003 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK, HORIZONT	57
691132700004 Würth Elektronik Midcom	TERM BLK 4POS TOP ENTRY 5MM PCB	0
691214310003 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK, HORIZONT	949
691412120007B Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK, 45 ENTR	166
691413720004B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, 45 ENTR	381
691252700003 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, VERTICAL	199
691210910005 Würth Elektronik Midcom	TERM BLOCK 5P HORIZON 2.54MM PCB	678
691214210101 Würth Elektronik Midcom	7.00 MM TERMINAL BLOCK, HORIZONT	981
691401710004B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	811

Terminal Blocks - Wire to Board

1. Overview

Terminal blocks - wire to board are modular, insulated connectors used to securely join wires to printed circuit boards (PCBs). They provide reliable electrical connections while enabling easy maintenance and reconfiguration. These components play a critical role in bridging wired systems with electronic control units, ensuring signal integrity and power transmission in applications ranging from industrial automation to consumer electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Screw Terminal Blocks	Use screws for mechanical clamping force, offering high reliability and vibration resistance	Industrial control panels, HVAC systems
Spring Clamp Terminal Blocks	Utilize spring pressure for quick wire insertion/removal without tools	Smart home devices, test equipment
IDC (Insulation Displacement Connectors)	Cut through wire insulation for rapid termination, eliminating pre-stripping	Telecom equipment, automotive wiring harnesses
Push-in Terminal Blocks	Accept pre-stripped wires with minimal insertion force	Lighting control systems, factory automation
PCB Terminal Blocks	Through-hole or surface-mount designs optimized for board-level integration	Medical devices, embedded systems

3. Structure and Components

A typical wire-to-board terminal block consists of: - Insulating Housing: Made from high-temperature resistant thermoplastics (e.g., PA66, PBT) for dielectric isolation - Conductive Terminals: Brass or phosphor bronze contacts with plating (Sn, Ag, Au) for corrosion resistance - Clamping Mechanism: Screw, spring, or lever-actuated systems for wire fixation - PCB Interface: Male/female contacts or solder tails for board mounting - Retention Features: Polarization keys and mechanical stops to prevent misalignment

4. Key Technical Specifications

Parameter	Importance	Typical Values
Rated Current	Determines maximum continuous operating current capacity	1-30A
Rated Voltage	Defines safe operating voltage range	50-600V
Contact Resistance	Impacts power loss and thermal performance	10m
Insulation Resistance	Ensures electrical safety and signal integrity	100M
Operating Temperature	Determines material stability in working environment	-40 C to +120 C
Wire Gauge Range	Specifies compatible conductor sizes	26-4AWG
Material Glow-Wire Rating	Measures fire resistance per IEC 60335	650-960 C

5. Application Fields

Key industries include: - Industrial Automation: PLCs, motor drives, CNC machines - Consumer Electronics: Home appliances, audio equipment - Renewable Energy: Solar inverters, wind turbine controllers - Medical Equipment: Diagnostic devices, patient monitors - Automotive: EV charging systems, battery management units

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Phoenix Contact	PTSA 1.5/2-H-PE	Spring clamp, 1.5mm wire capacity, push-in PCB interface
TE Connectivity	CXT PCB Terminal Block	Surface-mount design, 3A rating, halogen-free
Weidm ller	SAM 2.5/ 4-GN	Plug-in connectors, vibration-proof, 2.5mm pitch
Molex	PicoBlade 0.8mm	Ultra-compact IDC terminals for fine wires

7. Selection Recommendations

Key considerations: 1. Electrical Requirements: Match current/voltage ratings with system specifications 2. Mechanical Needs: Choose clamping method based on maintenance frequency 3. Environmental Factors: Select materials for temperature/humidity extremes 4. PCB Compatibility: Verify pitch, height, and footprint specifications 5. Total Cost: Balance upfront cost vs. long-term reliability in mission-critical applications

8. Industry Trends

Emerging trends include: - Miniaturization for IoT and wearable devices - High-density connectors supporting 0.4mm pitch - Smart terminal blocks with integrated diagnostics - Increased adoption of press-fit technology - RoHS-compliant materials with improved tracking resistance - Connectors for high-voltage EV systems (800V+)