114- 1056

Rev D

5

of 7

3.7. Soldering

A. Flux Selection

Solder tails must be fluxed prior to soldering. Selection of the flux will depend on the type of pc board and

other components mounted on the board. Additionally, the flux must be compatible with the wave solder

line, manufacturing, health, and safety requirements. Call the PRODUCT INFORMATION number at the

bottom of page 1 for consideration of other types of flux. Flux types that are compatible with these

switches are provided in Figure 5.

PROCESS STEP

CLEANING FLUX

PROCESS STEP

ORGANIC

RA (Active) ROSIN

RMA (Mildly Active) ROSIN

1

Heat

Heat

Extra pre--clean

2

Solder

Solder

Heat

3

Solder

4

Rinse in tap or de--ionized water

Rinse in tap or de--ionized water

5

Dry in ambient air or radiant heater

Dry in ambient or radiant heater

Rinse in tap or de--ionized water

6

—

—

Dry in ambient air or radiant heater

D

Reduces residue to soap.

Figure 5

B. Solder ing Process

Refer to Paragraph 2.5 for instructional material that is available for establishing soldering guidelines. The

switches can be soldered using wave soldering or equivalent soldering techniques. It is recommended

using SN60 or SN62 solder for these switches. The maximum solder profile temperature should be

245+10_C [473+10_F]. These switches are not recommended for reflow process.

C. Cleaning

After soldering, removal of fluxes, residues, and activators is necessary. Automatic in--line cleaning is

recommended for the sealed switch. Installation in a socket is recommended for the unsealed switch.

Consult with the supplier of the solder and flux for recommended cleaning solvents. Cleaners must be free

of dissolved flux and other contaminants. It is recommended cleaning with the pc board on its edge. If

using an aqueous cleaner, standard equipment such as a soak--tank or an automatic in--line machine

should be used. The following is a list of common cleaning solvents that will not affect the switches for the

time and temperature specified. See Figure 6.

Vapor cleaning (with the pc board on edge) is preferred over submersion in a liquid cleaner. Unsealed switches should

not be submerged due to contaminants in the cleaning bath.

Do NOT ultrasonically clean switches sealed with tape or masking material.

Consideration must be given to toxicity and other safety requirements recommended by the solvent manufacturer.

Refer to the manufacturer’s Material Safety Data Sheet (MSDS) for characteristics and handling of cleaners.

Trichloroethylene and Methylene Chloride is not recommended because of harmful occupational and environmental

effects. Both are carcinogenic (cancer--causing).

If you have a particular solvent that is not listed, contact PRODUCT INFORMATION at the number at the bottom of

page 1.

NOTE

i

CAUTION

!

DANGER

NOTE

i