Reliability
The Mean Time Between Failure (MTBF) of the PKB 4000 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 PKB 4000 series products is:
3 .5 million hours according to DependTool .
1 .5 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 .
Quality Statement
The PKB 4000 series DC/DC converters are designed and
manufactured in an industrial environment where quality systems
and methods like ISO 9000, 6
σ (sigma), and SPC are intensively
in use to boost the continuous improvements strategy. Infant
mortality or early failures in the products are screened out and
they are subjected to an ATE-based final test . Conservative design
rules, design reviews and product qualifications, plus the high
competence of an engaged work force, contribute to the high
quality of our products .
Limitation of Liability
Ericsson Power Modules does not make any other warranties,
expressed or implied including any warranty of merchantability or
fitness for a particular purpose (including, but not limited to, use in
life support applications, where malfunctions of product can cause
injury to a person's health or life) .
Soldering Information
Delivery Package Information
PKB 4000 series standard delivery package is a 100 pcs box .
(one box contains 5 full clamshells)
Clamshell Specification
Material:
PET
Max surface resistance:
1012 Ohm/sq
Color:
Transparent
Capacity:
20 pcs/clamshell
Weight:
135 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)
The PKB 4000 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 .
EN/LZT 146 033 R9A Ericsson Power Modules, March 2007
PKB 4000 Datasheet
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