36
4–6 Precautions for Assembly Using Mini Flat Coupler
1) Soldering
2) Cleaning
Avoid rise in the device temperature as much as possible by observing the following conditions.
a) Soldering lead directly (by solder header)
260˚C max, 10 second max, for once.
b) Reflow soldering
(1) Complete the reflow process for once within 30 second at a package surface temperature above 210°C.
(2) Atmospheric temperature close to mold body surface : 240˚C max, 10 second max
(3) Recommended temperature profile
c) Precautions for heating
(1) Soldering time has to be kept as short as possible.
(2) When using a halogen lamp or infrared heater, please do not irradiate the mold body surface directly.
d) Dip soldering (Flow soldering)
Reflow soldering is recommended, because thermal stress is much less than in other soldering methodes.
2–1) The following types of solvents are recommended for cleaning the flux.
Toshiba Technocare (FRW-1, FRW-17, FRW-100) Kao Cleanthru 750H
Asahi Clean AK-225AES Pine-alpha ST-100S
2–2) Cleaning Conditions
Cleaning conditions and precautions may differ depending on the product specifications.
When cleaning the flux, reactive ions such as Cl and Na must be removed.
a) General precautions on dip cleaning
Dipping time may differ depending on the solvent used.
However, as a general reference, it is recommended to limit the dip 3 minutes.
b) General precautions on ultrasonic cleaning
When ultrasonic cleaning is conducted for excessively long times, contact between product resin and
metal leads may lessen. Also, excessive ultrasonic stress may cause cracks in the pellet.
It is recommended to apply a minimum of stress.
Recommended condidtions for standard ultrasonic cleaning
Frequency : 27 to 29kHz Time : 30 seconds or less
Output : 0.25 W/ cm
2
or less Temperature : 50˚C (may differ depending on the solvent used)
Cleaning must be conducted in a condition in which the printed circuit board or device should be floating on
the solvent used in order to avoid direct contact with the ultrasonic vibrator.
2–3) Handling Precautions
During cleaning, or when cleaning liquid is being applied to a device, do not touch the device-marking
surface with hand or brush. Device markings may be erased.
It is necessary to confirm the safety of the solvent used for cleaning, as well as cleaning conditions,
so as not to harm the device package.
60 to 90 30
(°C)
times (s)
240
210
150
Contact Toshiba when you plan to use dip soldering.