Select the optimal terminal type for 19mm SPDT micro switch

Select the optimal terminal type for 19mm SPDT micro switch PCB integration by evaluating mechanical stability, electrical performance, and manufacturing scalability.

Solder Terminals: Core Attributes & Suitability

• Mechanical Interface: Utilizes tinned copper or brass pins (typically 0.5–0.8mm diameter) designed for insertion into PCB through-holes (matching the 19mm switch’s compact footprint, ~5–8mm terminal spacing). Post-soldering, the joint forms a rigid bond that resists vibration (critical for industrial PCBs subject to 10–50Hz oscillations).

• Electrical Performance: Provides <5mΩ contact resistance (lower than quick-connect tabs) and eliminates "contact creep" (a risk with crimped connections under thermal cycling). Ideal for low-current (≤1A) or high-frequency (≥1MHz) circuits common in 19mm switch applications (e.g., sensor modules).

• Manufacturing Compatibility: Compatible with automated SMT (Surface Mount Technology) or THT (Through-Hole Technology) assembly lines. However, rework requires desoldering tools (e.g., solder suckers) and risks PCB pad damage—unsuitable for high-mix, low-volume production.

Quick-Connect Tabs: Core Attributes & Suitability

• Mechanical Interface: Features U-shaped or flag-style tabs (0.25–0.5mm thickness) that crimp onto PCB-mounted terminals (e.g., 6.3mm or 4.8mm blade connectors). The 19mm switch’s small housing limits tab length to 3–5mm, requiring precise PCB layout to avoid interference with adjacent components.

• Electrical Performance: Contact resistance ranges from 10–20mΩ (higher than solder) but is sufficient for medium-current (1–5A) applications (e.g., industrial control PCBs). Vulnerable to oxidation if exposed to humidity (>60% RH), so requires conformal coating in harsh environments.

• Manufacturing Compatibility: Enables tool-free installation (no soldering) and 30-second rework cycles—ideal for prototyping or field repairs. Not compatible with automated assembly, making it cost-prohibitive for high-volume (≥10,000 units) production.

A Quick Tip for 19mm Switches:

Since the switch is small (19mm), make sure your PCB has enough space:

• Solder terminals need tiny holes (about the size of a pinhead) for the pins.

• Quick-connect tabs need small posts—don’t put other components too close, or the tabs won’t snap on right.