UEI30 Series

30W Isolated Wide-Range DC/DC Converters

www.murata-ps.com

email: sales@murata-ps.com

03 Feb 2011

MDC_UEI Series 30W.A14 Page 10 of 16

Mean Time Before Failure (MTBF) Table

These figures 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 qualified 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 fixed 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.