Reliability
Soldering Information
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°Cꢀ Different methods could be
used to calculate the predicted MTBF and failure rate which may
give different resultsꢀ Ericsson Power Modules currently uses two
different methods, Ericsson failure rate data system DependTool
and Telcordia SR332ꢀ
The PKB 4000 Series DC/DC converters are intended for through
hole mounting on a PCBꢀ When wave soldering is used max
temperature on the pins is specified to 260°C for 10 secondsꢀ
Maximum preheat rate of 4°C/s and temperature of max 130°C is
suggestedꢀ 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 overheatingꢀ
Predicted MTBF for the PKB 4000 series products is:
3ꢀ5 million hours according to DependToolꢀ
1ꢀ5 million hours according to Telcordia SR332, issue 1,
Black box techiqueꢀ
No-clean flux is recommended to avoid entrapment of cleaning
fluids in cavities inside of the DC/DC power moduleꢀ The residues
may affect long time reliability and isolation voltageꢀ
The Ericsson failure rate data system is based on field tracking
dataꢀ The data corresponds to actual failure rates of components
used in Information Technology and Telecom (IT&T) equipment in
temperature controlled environments (TA = -5ꢀꢀꢀ+65°C)ꢀ Telcordia
SR332 is a commonly used standard method intended for reliability
calculations in IT&T equipmentꢀ The parts count procedure used
in this method was originally modeled on the methods from MIL-
HDBK-217F, Reliability Predictions of Electronic Equipmentꢀ It
assumes that no reliability data is available on the actual units and
devices for which the predictions are to be made, iꢀeꢀ all predictions
are based on generic reliability parametersꢀ
Delivery Package Information
PKB 4000 series standard delivery package is a 100 pcs boxꢀ
(one box contains 5 full clamshells)
Clamshell Specification
Material:
PET
Max surface resistance:
Color:
Capacity:
1012 Ohm/sq
Transparent
20 pcs/clamshell
135 g (typ)
Weight:
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, 6σ (sigma), and SPC are intensively
in use to boost the continuous improvements strategyꢀ Infant
mortality or early failures in the products are screened out and
they are subjected to an ATE-based final testꢀ Conservative design
rules, design reviews and product qualifications, plus the high
competence of an engaged work force, contribute to the high
quality of our productsꢀ
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 0ꢀ1% by weight in homogeneous
materials for lead, mercury, hexavalent chromium, PBB and PBDE
and of 0ꢀ01% by weight in homogeneous materials for cadmiumꢀ
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 (eꢀgꢀ 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)
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)ꢀ
EN/LZT 146 033 R9A ©Ericsson Power Modules, March 2007
41
PKB 4000 Datasheet
ERICSSON [ ERICSSON ]
