SC16C2550 datasheet(42/46 Pages) PHILIPS

Part #	SC16C2550

Description	Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder

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Manufacturer	PHILIPS [NXP Semiconductors]

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42 / 46 page

Philips Semiconductors

SC16C2550

Dual UART with 16 bytes of transmit and receive FIFOs and IrDA

encoder/decoder

Product data

Rev. 03 — 19 June 2003

42 of 46

9397 750 11621

12. Soldering

12.1 Introduction

This text gives a very brief insight to a complex technology. A more in-depth account

of soldering ICs can be found in our

Data Handbook IC26; Integrated Circuit

Packages (document order number 9398 652 90011).

There is no soldering method that is ideal for all IC packages. Wave soldering is often

preferred when through-hole and surface mount components are mixed on one

printed-circuit board. Wave soldering can still be used for certain surface mount ICs,

but it is not suitable for ﬁne pitch SMDs. In these situations reﬂow soldering is

recommended. Driven by legislation and environmental forces the worldwide use of

lead-free solder pastes is increasing.

12.2 Through-hole mount packages

12.2.1

Soldering by dipping or by solder wave

Typical dwell time of the leads in the wave ranges from 3 to 4 seconds at 250

°C or

265

°C, depending on solder material applied, SnPb or Pb-free respectively.

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.

12.2.2

Manual soldering

Apply the soldering iron (24 V or less) to the lead(s) of the package, either 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.

12.3 Surface mount packages

12.3.1

Reﬂow soldering

Reﬂow soldering requires solder paste (a suspension of ﬁne solder particles, ﬂux and

binding agent) to be applied to the printed-circuit board by screen printing, stencilling

or pressure-syringe dispensing before package placement.

Several methods exist for reﬂowing; for example, convection or convection/infrared

heating in a conveyor type oven. Throughput times (preheating, soldering and

cooling) vary between 100 and 200 seconds depending on heating method.

Typical reﬂow peak temperatures range from 215 to 270

°C depending on solder

paste material. The top-surface temperature of the packages should preferably be

kept:

• below 220

°C (SnPb process) or below 245 °C (Pb-free process)

– for all the BGA and SSOP-T packages

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Manufacturer	Part #	Datasheet	Description
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