What are the preheating and soldering temperature conditions for automatic soldering on PCBs?

ID: FAQE10056E

update:

Answer

The conditions are different for through-hole flow and surface-mount reflow. Refer to Explanation for details.

Explanation

Through-hole mounting type

[1-1 Preheating process]
Preheating: 110°C max. / Duration: Within 40 seconds

  1. Caution
    • Be sure to preheat to improve the solderability.
    • Preheat under the above conditions.
    • Do not use a relay that has been left in high temperature for a long time due to equipment failure which may cause a change in initial characteristics.
  2. Availability of preheating
    • Closed type: Not applicable
    • Flux-resistant type: Applicable
    • Plastic-sealed type: Applicable

[1-2 Soldering]
Solder temperature: ca. 260°C / Soldering time: Within about 5 seconds

  1. Caution
    • The flow solder type is recommended for uniformity of quality.
    • Adjust the fluid level so that the solder does not overflow on the PCB.
  2. Availability of automatic soldering
    • Closed type: Not applicable
    • Flux-resistant type: Applicable
    • Plastic-sealed type: Applicable

Surface-mount type
Examples of recommended soldering conditions for the IRS (infrared reflow soldering) are shown in the following temperature profile (PCB surface).

  • Recommended soldering conditions may differ for each relay. Please check individual specifications before use (refer to the Precautions for each model).
  • Do not soak the product in cold liquid such as cleaning solution immediately after soldering. Doing so may damage the seal.
  • Do not soak the relay in the solder bath. Doing so may cause malfunction due to resin deformation.

[Solder for mounting: Lead-free solder]

Solder for mounting:   Lead-free solder

[Solder for mounting: Lead solder]

Solder for mounting:   Lead solder

For more information, see Safty Precautions for All Relays: 6-10 Automatic Mounting of Relays for PCBs.

Quick tips

  1. After automatic soldering, immediately blow air to cool the relay and other components so that they do not deteriorate due to the heat of soldering.
  2. You may clean the plastic-sealed type but do not soak it in cold liquid such as cleaning solution immediately after soldering.
    Doing so may damage the seal.

*Precautions: Cooling is required for flux-resistant and plastic-sealed relays.

Product category Relays Signal Relays Power Relays
Classification Mounting, Storage
Related keywords
  • Signal relay
  • Power relay
  • PCB relay
  • Automatic soldering
  • Preheating
  • Soldering temperature
  • Through-hole mounting type
  • Surface-mount type

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