Terminal Blocks - Wire to Board

Part Number	Description / PDF	Quantity
691213500002 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK, VERTICAL	962
691135700004 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, VERTICAL	489
691411510006 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK, HORIZONT	94
691103110002 Würth Elektronik Midcom	TERM BLK 2POS SIDE ENT 3.5MM PCB	1232
691213610002 Würth Elektronik Midcom	TERM BLK 2P SIDE ENT 10.16MM PCB	177
691401710005B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	332
691241600003 Würth Elektronik Midcom	TERM BLK 3P TOP ENT 10.16MM PCB	0
691412220005M Würth Elektronik Midcom	TERM BLOCK 5POS 45DEG 7MM PCB	0
691404910002B Würth Elektronik Midcom	TERM BLK 2POS SIDE ENT 7.5MM PCB	245
691415520002 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK, 45 ENTR	542
691136700007 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, VERTICAL	200
691412120008B Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK, 45 ENTR	339
691252800002 Würth Elektronik Midcom	10.00 MM TERMINAL BLOCK, VERTICA	190
691216600001 Würth Elektronik Midcom	TERM BLOCK 1POS TOP ENTRY PCB	0
691133710007 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	200
691213510002 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK, HORIZONT	0
691411710003B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	387
691250910002 Würth Elektronik Midcom	9.52 MM TERMINAL BLOCK, HORIZONT	206
691402910008B Würth Elektronik Midcom	2.54 MM TERMINAL BLOCK, HORIZONT	478
691135710007 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	190

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+)