MEE1 Series

Isolated 1W Single Output DC/DC Converters

KDC_MEE1.C01 Page 6 of 7

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All dimensions in mm ±0.25mm (inches ±0.01). All pins on a 2.54 (0.1) pitch and within ± 0.25 (0.01) of true position.

Weight: 1.28g (SIP), 1.56g (DIP)

PACKAGE SPECIFICATIONS

MECHANICAL DIMENSIONS

PIN CONNECTIONS - 8 PIN DIP

Pin

Function

PIN CONNECTIONS - 4 PIN SIP

Pin

Function

DIP Package

SIP Package

11.48

(0.45)

6.00

(0.236)

0.30 (0.0118)

0.20 (0.0078)

1.69 (0.067)

2.41 (0.094)

7.62

(0.3)

1.25

(0.049)

10.0

(0.394)

0.55 (0.022)

0.45 (0.018)

4.60 (0.181)

3.60 (0.142)

0.55 (0.022)

0.45 (0.018)

6.80 (0.268)

4.60 (0.181)

3.60 (0.142)

0.55 (0.022)

0.45 (0.018)

11.50 (0.453)

9.80 (0.386)

0.30 (0.0118)

0.20 (0.0078)

1.09 (0.043)

1.94 (0.0764)

7.62 (0.3)

7.62 (0.3)

5.08 (0.2)

14

5

7

12

3

4

MEE1S0505DC

XYYWW

MEE1S0505SC

XYYWW

TECHNICAL NOTES

ISOLATION VOLTAGE

‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand

Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test

voltage, applied for a specified time, across a component designed to provide electrical

isolation, to verify the integrity of that isolation.

Murata Power Solutions MEE1 series of DC/DC converters are all 100% production

tested at their stated isolation voltage. This is 1kVDC for 1 second.

A question commonly asked is, “What is the continuous voltage that can be applied

across the part in normal operation?”

The MEE1 has been recognized by Underwriters Laboratory for functional insulation,

both input and output should normally be maintained within SELV limits i.e. less than

42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to

transient voltages and the part should never be used as an element of a safety isolation

system. The part could be expected to function correctly with several hundred volts off-

set applied continuously across the isolation barrier; but then the circuitry on both sides

of the barrier must be regarded as operating at an unsafe voltage and further isolation/

insulation systems must form a barrier between these circuits and any user-accessible

circuitry according to safety standard requirements.

REPEATED HIGH-VOLTAGE ISOLATION TESTING

It is well known that repeated high-voltage isolation testing of a barrier component can

actually degrade isolation capability, to a lesser or greater degree depending on materi-

als, construction and environment. The MEE1 series has toroidal isolation transformers,

with no additional insulation between primary and secondary windings of enameled

wire. While parts can be expected to withstand several times the stated test voltage,

the isolation capability does depend on the wire insulation. Any material, including this

enamel (typically polyurethane) is susceptible to eventual chemical degradation when

subject to very high applied voltages thus implying that the number of tests should be

strictly limited. We therefore strongly advise against repeated high voltage isolation test-

ing, but if it is absolutely required, that the voltage be reduced by 20% from specified

test voltage.

This consideration equally applies to agency recognized parts rated for better than func-

tional isolation where the wire enamel insulation is always supplemented by a further

insulation system of physical spacing or barriers.