78250JC-R Murata Power Solutions Inc, 78250JC-R Datasheet

78250JC-R

Manufacturer Part Number

78250JC-R

Description

Tfmr 1:1 SM MAX250 Maxim

Manufacturer

Murata Power Solutions Inc

Datasheet

1.78250JC.pdf (3 pages)

Specifications of 78250JC-R

Mounting Style

SMD/SMT

Dimensions

12.7 mm L x 9 mm W x 6.35 mm H

Product

Toroidal Power Transformers

Current Rating

300 mA

Height

6.35 mm

Inductance

2 mH

Length

12.7 mm

Turns Ratio

1:1

Width

9 mm

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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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.

For through hole versions see 78250 datasheet.

J-STD-020D reﬂ ow

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

Industrial temperature range

www.murata-ps.com/rohs

For full details go to

All speciﬁ cations typical at T

ABSOLUTE MAXIMUM RATINGS

CHARACTERISTICS 78250JC

Parameter

Primary Inductance, L

Leakage Inductance, L

Interwinding Capacitance, C

Primary D.C. Resistance, R

Volt-time Product, Et

Turns Ratio

CHARACTERISTICS 78250JVC

Parameter

Primary Inductance, L

Leakage Inductance, L

Interwinding Capacitance, C

Primary D.C. Resistance, R

Volt-time Product, Et

Turns Ratio

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 Voltage’,

‘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 electri-

cal 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 volt-

age that can be applied across the part in normal operation?”

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-accessi-

ble circuitry according to safety standard requirements.

78250JC-R / 78250JVC-R

78250JC / 78250JVC

Order Code

VOLTAGE

=25°C

MAX250/MAX251 Compatible Converter SM Transformers

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

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 depend on

the wire insulation. Any material, including this enamel

(typically polyurethane) is susceptible to eventual

chemical degradation when subject to very high ap-

plied voltages thus implying that the number of tests

should be strictly limited. We therefore 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.

2010-11-09 KMP_78250JC_A01 Page 1 of 3

Min.

Packaging Type

1.0

Tape & Reel

Tube

78250J Series

Typ.

2.0

0.6

0.7

1:1

2.0

0.9

1:1

-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 78250JC-R

78250JC-R Summary of contents

Page 1

... Volt-time Product, Et Pins1/2 or 2/3 Turns Ratio ORDER CODE DETAILS Order Code Package Type 78250JC / 78250JVC 6 Pin SM 78250JC-R / 78250JVC-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

... All pins on a 0.1 (2.54) pitch and within ±0.01 (0.25) of true position. * Pin 5 is connected to secondary center tap. Package Weight 1.0g TYP. 0.10 (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. 1 Matte tin 245° 100s 2010-11-09 KMP_78250JC_A01 Page ...

Page 3

... Min. Goods enclosure section 0.96 (24.4) 1.04 (26.4) Trailer section 6.3 (160) Min. +0.004 +0.10 0.059 (1.50 ) -0.000 -0.00 0.024 (0.60) Max. Direction of unreeling Unless otherwise stated all dimensions in inches (mm) ±0.01(0.25). © 2010 Murata Power Solutions, Inc. 2010-11-09 KMP_78250JC_A01 Page ...

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