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Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without
notice. © 2015 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
UEI30 Series
30W Isolated Wide-Range DC-DC Converters
MDC_UEI Series 30W.B02 Page 18 of 18
Mean Time Before Failure (MTBF) Table
These fi gures use a standard MTBF probability calculation as an indication of component parts stress and life derating. The calculaton is based on separate MTBF
values for all internal parts in addition to stated environmental conditions. Two MTBF values are presented. The Telcordia method is widely used in industry, partic-
ularly telecom. The United States MIL-HDBK method is for military and industrial applications. Please refer to a qualifi ed reliability engineer for more background.
Model Number MTBF (Hours) Method [1,2]
UEI30-033-Q12N-C 2,676,902 Telcordia
UEI30-033-Q12N-C 2,123,124 MIL-HDBK
UEI30-033-Q12P-C 2,733,781 Telcordia
UEI30-033-Q12P-C 2,142,206 MIL-HDBK
UEI30-033-Q48N-C 3,416,592 Telcordia
UEI30-033-Q48N-C 3,172,548 MIL-HDBK
UEI30-033-Q48P-C 3,427,027 Telcordia
UEI30-033-Q48P-C 3,193,652 MIL-HDBK
UEI30-050-Q12N-C 2,531,509 Telcordia
UEI30-050-Q12N-C 2,207,508 MIL-HDBK
UEI30-050-Q12P-C 2,554,127 Telcordia
UEI30-050-Q12P-C 2,229,031 MIL-HDBK
UEI30-120-Q48N-C 3,072,461 Telcordia
UEI30-120-Q48N-C 2,510,927 MIL-HDBK
UEI30-120-Q48P-C 2,900,319 Telcordia
UEI30-120-Q48P-C 2,495,846 MIL-HDBK
UEI30-150-Q48N-C 2,833,366 Telcordia
UEI30-150-Q48N-C 2,408,836 MIL-HDBK
UEI30-150-Q48P-C 2,776,615 Telcordia
UEI30-150-Q48P-C 2,421,938 MIL-HDBK
Notes:
[1] Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method
1, Case 3, ISSUE 2, ground fi xed controlled conditions, Tambient=+25°C, full output load,
natural air convection.
[2] Mean Time Before Failure is calculated using MIL-HDBK-217FN2, GB ground benign,
Tambient=+25°C, full output load, natural air convection.
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing these converters. These specifi cations vary depending on the solder type. Exceeding these specifi ca-
tions may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders: For Sn/Pb based solders:
Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C.
Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C.
Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds