B78476A8253A003 datasheet, PDF

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B78476A8253A003: DescriptionDATACOM TRANSFORMER FOR 1000 BASE-T; LAN APPLICATION(S), ROHS COMPLIANT; CategoryPower management transformer; File Size266KB，6 Pages; ManufacturerEPCOS (TDK); Environmental Compliance

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B78476A8253A003 Overview

DATACOM TRANSFORMER FOR 1000 BASE-T; LAN APPLICATION(S), ROHS COMPLIANT

B78476A8253A003 Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
package instruction	ROHS COMPLIANT
Reach Compliance Code	compliant
ECCN code	EAR99
application	1000 BASE-T; LAN
high	5.8 mm
Insulation voltage	1500 V
length	17.6 mm
Installation features	SURFACE MOUNT
Number of functions	4
Maximum operating temperature	70 °C
Minimum operating temperature
method of packing	TAPE & REEL, BLISTER
physical size	L17.6XB12.1XH5.8 (mm)
Primary inductance	350 µH
surface mount	YES
Transformer type	DATACOM TRANSFORMER
Turns ratio (Np:Ns)	1CT:1CT
width	12.1 mm
Base Number Matches	1

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Magnetics modules for LAN applications

1000 Base-T magnetics module

Series/Type:

Date:

B78476A8253A003

March 2015

information contained therein without EPCOS' prior express consent is prohibited.

EPCOS AG is a TDK Group Company.

1000 Base-T magnetics module

Single port, power over ethernet

B78476A8253A003

Cautions and warnings

For soldering conditions of SMD components please refer to JEDEC J-STD-020D.

If the components are to be washed varnished it is necessary to check whether the washing

varnish agent that is used has a negative effect on the wire insulation, any plastics that are

used, or on glued joints. In particular, it is possible for washing varnish agent residues to have a

negative effect in the long-term on wire insulation.

Washing processesmay damage the product due to the possible static or cyclic mechanical

loads (e.g. ultrasonic cleaning). They may cause cracks to developon the product and its parts,

which might lead to reduced reliability or lifetime.

The following points must be observed if the components are potted in customer applications:

– Many potting materials shrink as they harden. They therefore exert a pressure on the plastic

housing or core. This pressure can have a deleterious effect on electrical properties, and in

extreme cases can damage the core or plastic housing mechanically.

– It is necessary to check whether the potting material used attacks or destroys the wire

insulation, plastics or glue.

– The effect of the potting material can change the high-frequency behaviour of the

components.

Ferrites are sensitive to direct impact. This can cause the core material to flake, or lead to

breakage of the core.

Even for customer-specific products, conclusive validation of the component in the circuit can

only be carried out by the customer.

Display of ordering codes for EPCOS products

The ordering code for one and the same product can be represented differently in data sheets,

data books, other publications and the website of EPCOS, or in order-related documents such as

shipping notes, order confirmations and product labels. The varying representations of the

ordering codes are due to different processes employed and do not affect the specifications of the

respective products. Detailed information can be found on the Internet under

www.epcos.com/orderingcodes.

Please read

Cautions and warnings

and

Important notes

at the end of this document.

Page 4 of 6

Important notes

The following applies to all products named in this publication:

1. Some parts of this publication contain

statements about the suitability of our products for

certain areas of application.

These statements are based on our knowledge of typical re-

quirements that are often placed on our products in the areas of application concerned. We

nevertheless expressly point out

that such statements cannot be regarded as binding

statements about the suitability of our products for a particular customer application.

As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar

with them than the customers themselves. For these reasons, it is always ultimately incum-

bent on the customer to check and decide whether an EPCOS product with the properties de-

scribed in the product specification is suitable for use in a particular customer application.

2. We also point out that

in individual cases, a malfunction of electronic components or

failure before the end of their usual service life cannot be completely ruled out in the

current state of the art, even if they are operated as specified.

In customer applications

requiring a very high level of operational safety and especially in customer applications in

which the malfunction or failure of an electronic component could endanger human life or

health (e.g. in accident prevention or lifesaving systems), it must therefore be ensured by

means of suitable design of the customer application or other action taken by the customer

(e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by

third parties in the event of malfunction or failure of an electronic component.

The warnings, cautions and product-specific notes must be observed.

4. In order to satisfy certain technical requirements,

some of the products described in this

publication may contain substances subject to restrictions in certain jurisdictions (e.g.

because they are classed as hazardous).

Useful information on this will be found in our Ma-

terial Data Sheets on the Internet (www.epcos.com/material). Should you have any more de-

tailed questions, please contact our sales offices.

5. We constantly strive to improve our products. Consequently,

the products described in this

publication may change from time to time.

The same is true of the corresponding product

specifications. Please check therefore to what extent product descriptions and specifications

contained in this publication are still applicable before or when you place an order. We also

reserve the right to discontinue production and delivery of products.

Consequently, we

cannot guarantee that all products named in this publication will always be available. The

aforementioned does not apply in the case of individual agreements deviating from the fore-

going for customer-specific products.

6. Unless otherwise agreed in individual contracts,

all orders are subject to the current ver-

sion of the "General Terms of Delivery for Products and Services in the Electrical In-

dustry" published by the German Electrical and Electronics Industry Association

(ZVEI).

Page 5 of 6

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