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EN/LZT 146 201 R3A Ericsson Power Modules, February 2007
PKM 4000D Datasheet
Reliability
The PKM4000D Series DC/DC converters are intended for
through hole mounting on a PCB. When wave soldering
is used max temperature on the pins is specified to
260°C for 10 seconds. Maximum preheat rate of 4°C/s
and temperature of max 130°C is suggested. When hand
soldering, care should be taken to avoid direct contact
between the hot soldering iron tip and the pins for more
than a few seconds in order to prevent overheating.
No-clean flux is recommended to avoid entrapment of
cleaning fluids in cavities inside of the DC/DC power
module. The residues may affect long time reliability and
isolation voltage.
Soldering Information
The Mean Time Between Failure (MTBF) of the PKM 4000D
series DC/DC converter is calculated at full output power
and an operating ambient temperature (TA) of +40°C.
Different methods could be used to calculate the predicted
MTBF and failure rate which may give different results.
Ericsson Power Modules currently uses two different
methods, Ericsson failure rate data system DependTool and
Telcordia SR332.
Predicted MTBF for the PKM 4000D series products is:
3.15 million hours according to DependTool.
1.67 million hours according to Telcordia SR332, issue
1, Black box techique.
The Ericsson failure rate data system is based on field
tracking data. The data corresponds to actual failure
rates of components used in Information Technology
and Telecom (IT&T) equipment in temperature controlled
environments
(TA = -5...+65°C). Telcordia SR332 is a commonly used
standard method intended for reliability calculations in IT&T
equipment. The parts count procedure used in this method
was originally modeled on the methods from MIL-HDBK-
217F, Reliability Predictions of Electronic Equipment. It
assumes that no reliability data is available on the actual
units and devices for which the predictions are to be
made, i.e. all predictions are based on generic reliability
parameters.
Delivery Package Information
PKM 4000D series standard delivery package is a 20 pcs box.
(one box contains 1 full tray and 1 hold down tray)
Clamshell Specification
Material:
Polystyrene (PS)
Max surface resistance:
10 MOhm/sq
Color:
black
Capacity:
20 pcs/tray
Loaded tray stack pitch:
38 mm (1.50 In)
Weight:
138 g (typ)
Compatibility with RoHS requirements
The products are compatible with the relevant clauses
and requirements of the RoHS directive 2002/95/EC and
have a maximum concentration value of 0.1% by weight
in homogeneous materials for lead, mercury, hexavalent
chromium, PBB and PBDE and of 0.01% by weight in
homogeneous materials for cadmium.
Exemptions in the RoHS directive utilized in Ericsson Power
Modules products include:
Lead in high melting temperature type solder (used to solder
the die in semiconductor packages)
Lead in glass of electronics components and in electronic
ceramic parts (e.g. fill material in chip resistors)
Lead as an alloying element in copper alloy containing up to
4% lead by weight (used in connection pins made of Brass)