782485/55C Murata Power Solutions Inc, 782485/55C Datasheet

782485/55C

Manufacturer Part Number

782485/55C

Description

XFRMR 1:1.5 T/H ADM2485 ANLG DEV

Manufacturer

Murata Power Solutions Inc

Series

782485r

Datasheet

1.78248535C.pdf (2 pages)

Specifications of 782485/55C

Inductance

513µH

Dc Resistance

600mohm

Et Constant

19V/Âµs

Isolation Voltage

2500Vrms

Turns Ratio

1CT

Transformer Mounting

PC Board

Supply Voltage

Output Voltage

Transformer Type

Pulse

Mounting Style

SMD/SMT

Dimensions

9.77 mm L x 9.14 mm W x 6.35 mm H

Product

Isolation Transformers

Height

6.35 mm

Length

9.77 mm

Termination Style

Solder

Width

9.14 mm

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

For Use With/related Products

ADM2485

Lead Free Status / Rohs Status

Compliant

Other names

811-1204-5

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FEATURES

DESCRIPTION

The 782485 series of converter transformers are

speciﬁcally designed for use with Analog Devices

chipsets to provide isolated RS-485 and RS-422

interfaces. Carefully controlled turns ratios

ensure consistent performance whilst a toroidal

construction minimises EMI.

www.murata-ps.com

RoHS compliant

Analog Devices ADM2485 compatible

2.5kVrms isolation

Industry-standard pinout

UL 94 V-0 package materials

Low proﬁle

Toroidal construction

Fully encapsulated

Industrial temperature range

Surface mount versions available soon

Recommended by Analog Devices, Inc.

Backward compatible with

Sn/Pb soldering systems

www.murata-ps.com/rohs

For full details go to

Speciﬁcations typical at T

1 Where pulse applied across pins 1 and 2.

2 For further information, please visit www.murata-ps.com/rohs

ABSOLUTE MAXIMUM RATINGS

SOLDERING INFORMATION

SELECTION GUIDE

CHARACTERISTICS 782485/35C

Parameter

Primary Inductance, L

Leakage Inductance, L

Interwinding Capacitance, C

Primary DC Resistance, R

Volt-time Product, Et

Operating free air temperature range

Storage temperature range

Isolation voltage (ﬂash tested for 1 second)

Peak wave solder temperature

Pin ﬁnish

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 speciﬁed 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 speciﬁc 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.

782485/35C

782485/55C

Order Code

VOLTAGE

= 25°C

Nominal Input

Voltage

3.3

5.0

Output Voltage

Conditions

100kHz, 10mV

<0.1VDC

5kHz, 5V

Nominal

6.0

Technical enquiries - email: mk@murata-ps.com, tel:

ADM2485 Compatible Converter Transformers

Max. Output

Current

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 speciﬁed 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.

200

Typ.

234

168

273

782485/35C

Max.

782485 Series

500

Isolation

Voltage

2500

RMS

KMP_782485C_A03 Page 1 of 2

-40°C to 85°C

-50°C to 125°C

2.5kVrms

300˚C for 10 seconds

Matte tin

Typ.

513

192

383

782485/55C

1CT:2.2CT

1CT:1.5CT

Turns

Ratio

+44 (0)1908 615232

Max.

600

Package

Units

Style

mΩ

Vμs

DIL

μH

Related parts for 782485/55C

782485/55C Summary of contents

Page 1

... Technical enquiries - email: mk@murata-ps.com, tel: 782485 Series ADM2485 Compatible Converter Transformers Max. Output Isolation Turns Current Voltage Ratio mA V RMS 200 2500 1CT:2.2CT 200 2500 1CT:1.5CT 782485/35C 782485/55C Typ. Max. Typ. Max. 234 513 168 192 273 500 383 600 12 19 -40° ...

Page 2

... China: Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com © 2008 Murata Power Solutions, Inc. 782485 Series ADM2485 Compatible Converter Transformers 2.54 (0.10) 2.54 (0.10) Ø1.20 (0.05) +0.15 (0.006) Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 KMP_782485C_A03 Page ...

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