78250M Murata Power Solutions Inc, 78250M Datasheet

78250M

Manufacturer Part Number

78250M

Description

Transformers CONVERTER XFRMR SMT

Manufacturer

Murata Power Solutions Inc

Datasheet

1.78250MC.pdf (3 pages)

Specifications of 78250M

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Available stocks

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Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78250M

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C&D

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321

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78250MC

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C&D

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78250MC-R

Manufacturer:

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12 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78250MV

Manufacturer:

SANYO

Quantity:

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78250MVC

Manufacturer:

MURATA

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1 367

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FEATURES

DESCRIPTION

The 78250 series of converter transformers

are speciﬁ cally designed for use with Maxim

chipsets to provide isolated RS232 interfaces.

Carefully controlled turns ratios ensure consistent

performance whilst a toroidal construction

minimises EMI.

RoHS compliant

Maxim MAX250/MAX251 compatible

Isolation to 4kVrms

Industry-standard pinout

Surface mount option

UL 94 V-0 package materials

Low proﬁ le

Toroidal construction

Fully encapsulated

Industrial temperature range

www.murata-ps.com/rohs

For full details go to

All speciﬁ cations typical at T

ABSOLUTE MAXIMUM RATINGS

CHARACTERISTICS 78250C/78250MC

Parameter

Primary Inductance, L

Leakage Inductance, L

Interwinding Capacitance, C

Primary D.C. Resistance, R

Volt-time Product, Et

CHARACTERISTICS 78250VC/78250MVC

Parameter

Primary Inductance, L

Leakage Inductance, L

Interwinding Capacitance, C

Primary D.C. Resistance, R

Volt-time Product, Et

ORDER CODE DETAILS

Operating free air temperature range

Storage temperature range

Lead temperature 1.5mm from case for 10 seconds

Peak current, I

Isolation voltage 78250(M)C (ﬂ ash tested for 1 second)

Isolation voltage 78250V(M)C (ﬂ ash tested for 1 second)

TECHNICAL NOTES

ISOLATION

‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Volt-

age’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’

are all terms that relate to the same thing, a test voltage,

applied for a speciﬁ ed time, across a component designed

to provide electrical isolation, to verify the integrity of that

isolation.

All products in this series are 100% production tested at

their stated isolation voltage.

A question commonly asked is, “What is the continuous

voltage that can be applied across the part in normal opera-

tion?”

For a part holding no speciﬁ c agency approvals both input

and output should normally be maintained within SELV limits

i.e. less than 42.4V peak, or 60VDC. The isolation test volt-

age 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 cor-

rectly with several hundred volts offset 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-acces-

sible circuitry according to safety standard requirements.

78250MC-R / 78250MVC-R

78250MC / 78250MVC

78250C / 78250VC

Order Code

VOLTAGE

=25°C

Conditions

10kHz, 100mV

100kHz, 100mV

<0.1VDC

Pins1/2 or 2/3

Conditions

10kHz, 100mV

100kHz, 100mV

<0.1VDC

Pins1/2 or 2/3

Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232

Package Type

MAX250/MAX251 Compatible Converter Transformers

6 Pin DIL

6 Pin SM

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 materials, construction and environ-

ment. This 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 de-

pend 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 there-

fore strongly advise against repeated high voltage

isolation testing, but if it is absolutely required, that

the voltage be reduced by 20% from speciﬁ ed test

voltage.

This consideration equally applies to agency recog-

nized parts rated for better than functional isolation

where the wire enamel insulation is always supple-

mented by a further insulation system of physical

spacing or barriers.

Min.

Packaging Type

1.0

2011-04-04 KMP_78250C_C04 Page 1 of 3

Tape & Reel

Tube

78250 Series

Typ.

2.0

1.0

2.0

1.4

-40°C to 85°C

-50°C to 125°C

300°C

300mA

1.5kVrms

4.0kVrms

Max.

2.5

3.0

2.0

2.5

1.8

Quantity

500

Units

Vμs

μH

Related parts for 78250M

78250M Summary of contents

Page 1

... Pins1/2 or 2/3 ORDER CODE DETAILS Order Code Package Type 78250C / 78250VC 6 Pin DIL 78250MC / 78250MVC 6 Pin SM 78250MC-R / 78250MVC-R 6 Pin SM ABSOLUTE MAXIMUM RATINGS Operating free air temperature range Storage temperature range Lead temperature 1.5mm from case for 10 seconds Peak current Isolation voltage 78250(M)C (ﬂ ash tested for 1 second) Isolation voltage 78250V(M)C (ﬂ ...

Page 2

... MAX250/MAX251 Compatible Converter Transformers 0.5 (12.70) 0.375 (9.52) Max. Primary 1 0.354 2 78250MC (9.0) Max. XYYWW 3 0.25 (6.35) 0.035 (0.90) 0.1 (2.54) Unless otherwise stated all dimensions in inches (mm) ±0.01 (0.25). All pins on a 0.1 (2.54) pitch and within ±0.01 (0.25) of true position. ...

Page 3

... 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 ...

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