PCE84C486 datasheet(32/36 Pages) PHILIPS

32 / 36 page

1996 Feb 21

Philips Semiconductors

Objective speciﬁcation

Microcontrollers for digital auto-sync and

VST TV controller applications

PCE84C486; PCE84C487

18 SOLDERING

18.1

Introduction

There is no soldering method that is ideal for all IC

packages. Wave soldering is often preferred when

through-hole and surface mounted components are mixed

on one printed-circuit board. However, wave soldering is

not always suitable for surface mounted ICs, or for

printed-circuits with high population densities. In these

situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.

A more in-depth account of soldering ICs can be found in

our

“IC Package Databook” (order code 9398 652 90011).

18.2

SDIP

18.2.1

SOLDERING BY DIPPING OR BY WAVE

The maximum permissible temperature of the solder is

260

°C; solder at this temperature must not be in contact

with the joint for more than 5 seconds. The total contact

time of successive solder waves must not exceed

5 seconds.

The device may be mounted up to the seating plane, but

the temperature of the plastic body must not exceed the

specified maximum storage temperature (Tstg max). If the

printed-circuit board has been pre-heated, forced cooling

may be necessary immediately after soldering to keep the

temperature within the permissible limit.

18.2.2

REPAIRING SOLDERED JOINTS

Apply a low voltage soldering iron (less than 24 V) to the

lead(s) of the package, below the seating plane or not

more than 2 mm above it. If the temperature of the

soldering iron bit is less than 300

°C it may remain in

contact for up to 10 seconds. If the bit temperature is

between 300 and 400

°C, contact may be up to 5 seconds.

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