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EPCOS AG 2012. Reproduction, publication and dissemination of this data sheet, enclosures

hereto and the information contained therein without EPCOS’ prior express consent is prohibited.

SAW Components

SAW filter

Short range devices

Series/type:

Ordering code: B3748

B39431B3748H110

Date:

Version: December 14, 2012

2.1

2December 14, 2012

B3748

434.42 MHz

Please read

cautions and warnings and

important notes

at the end of this document.

SAW Components

SAW filter

Data sheet

Application

■Low-loss RF filter for remote control receivers

■Balanced and unbalanced operation possible

Features

■Package size 3.0 x 3.0 x 1.0 mm3

■Package code DCC6E

■RoHS compatible

■Approximate weight 0.037 g

■Package for Surface Mount Technology

(SMT)

■Ni, gold-plated terminals

■Lead free soldering compatible with J - STD20C

■Passivation layer Elpas

■AEC-Q200 qualified component family

■Electrostatic Sensitive Device (ESD)

Pin configuration1)

■1 Input (recommended) or input ground

■2 Input ground (recommended) or input

■4 Output (recommended) or output ground

■5 Output ground (recommended) or output

■3,6 to be grounded

1) The recommended pin configuration usually offers best

suppression of electrical crosstalk. The filter characteris-

tics refer to this configuration.

3December 14, 2012

B3748

434.42 MHz

SAW Components

SAW filter

Data sheet

Please read

cautions and warnings and

important notes

at the end of this document.

Characteristics

Temperature range for specification: T = –45 ˚C to +95 ˚C

Terminating source impedance: ZS=50Ωand matching network

Terminating load impedance: ZL=50Ωand matching network

min. typ.

@ 25 ˚C max.

Center frequency fC— 434.42 — MHz

Minimum insertion attenuation αmin

incl. loss in matching elements (QL= 47) — 1.9 2.6 dB

excl. loss in matching elements — 1.5 2.2 dB

Pass band (relative to αmin)

434.27 ... 434.57 MHz — 0.6 2.0 dB

434.24 ... 434.60 MHz — 0.8 3.0 dB

Relative attenuation (relative to αmin)αrel

10.00 ... 380.00 MHz 55 60 — dB

380.00 ... 414.00 MHz 50 56 — dB

414.00 ... 422.00 MHz 46 52 — dB

422.00 ... 427.00 MHz 40 48 — dB

427.00 ... 432.92 MHz 24 29 — dB

432.92 ... 433.60 MHz 13 20 — dB

435.60 ... 445.00 MHz 25 29 — dB

445.00 ... 450.00 MHz 40 46 — dB

450.00 ... 810.00 MHz 45 54 — dB

810.00 ... 1500.00 MHz 60 65 — dB

1500.00 ... 2500.00 MHz 50 58 — dB

Impedance for pass band matching1)

1) Impedance for passband matching bases on an ideal, perfect matching of the SAW filter to source- and to load

impedance (here 50 Ohm). After removal of the SAW filter the input impedance of the input and output match-

ing network is calculated. The conjugate complex value of these characteristic impedances are the input and

output impedances for flat passband. For more details we refer to EPCOS application note #4.

Input: ZIN =R

IN || CIN — 350 || 2.2 — Ω || pF

Output: ZOUT =R

OUT || COUT —350 || 2.2 —Ω || pF

4December 14, 2012

B3748

434.42 MHz

Please read

cautions and warnings and

important notes

at the end of this document.

SAW Components

SAW filter

Data sheet

Maximum ratings

Operable temperature range T –45/+125 ˚C

Storage temperature range Tstg –45/+125 ˚C

DC voltage VDC 6 V

Source power PS10 dBm source impedance 50 Ω

5December 14, 2012

B3748

434.42 MHz

SAW Components

SAW filter

Data sheet

Please read

cautions and warnings and

important notes

at the end of this document.

Matching network to 50 Ω(element values depend on pcb layout and equivalent circuit)

Minimising the crosstalk

Foragoodultimaterejectionalowcrosstalkisnecessary.Lowcrosstalkcanberealisedwithagood

RF layout. The major crosstalk mechanism is caused by the “ground-loop” problem.

Grounding loops are created if input-and output transducer GND are connected on the top-side of

the PCB and fed to the system grounding plane by a common via hole. To avoid the common

ground path, the ground pin of the input- and output transducer are fed to the system ground plane

(bottom PCB plane) by their own via hole. The transducers’ grounding pins should be isolated from

the upper grounding plane.

A common GND inductivity of 0.5nH degrades the ultimate rejection (crosstalk) by 20dB.

The optimised PCB layout, including matching network for transformation to 50 Ohm, is shown

here. In this PCB layout the grounding loops are minimised to realise good ultimate rejection

Optimised PCB layout for SAW filters in DCC6E package, pinning 1,4 (top side, scale 1:1)

The bottom side is a copper plane (system ground area). The input and output grounding pins are

isolated and connected to the common ground by separated via holes.

For good contact of the upper grounding area with the lower side it is necessary to place enough

via holes.

Ls1 = 39 nH

Ls2 = 39 nH

6December 14, 2012

B3748

434.42 MHz

Please read

cautions and warnings and

important notes

at the end of this document.

SAW Components

SAW filter

Data sheet

ESD protection of SAW filters

SAW filters are Electro Static Discharge sensitive devices. To reduce the probability of damages

caused by ESD, special matching topologies have to be applied.

In general, “ESD matching” has to be ensured at that filter port, where electrostatic discharge is

expected.

Electrostatic discharges predominantly appear at the antenna input of RF receivers. Therefore

only the input matching of the SAW filter has to be designed to short circuit or to block the ESD

pulse.

Below two figures show recommended “ESD matching” topologies.

Depending on the input impedance of the SAW filter and the source impedance, the needed

component values have to be determined from case to case.

Fig. 1 MLC varistor plus ESD matching Fig. 2 Suppressor diode plus ESD matching

In cases where minor ESD occur, following simplified “ESD matching” topologies can be used

alternatively.

Fig. 3 shunt L – series L matching Fig. 4 series C – shunt L matching

Effectiveness of the applied ESD protection has to be checked according to relevant industry

standards or customer specific requirements.

For further information, please refer to EPCOS Application report:

“ESD protection for SAW filters”. This report can be found under www.epcos.com/rke. Click on

“data sheets” and then “Applications” under category “Further information”.

Lp2

Ls3

MLC1

to output

matching Lp2

Ls3

Dp1 matchin

to output

Lp1

Ls2

matching

to output

Lp2

Cs1

matching

to output

7December 14, 2012

B3748

434.42 MHz

SAW Components

SAW filter

Data sheet

Please read

cautions and warnings and

important notes

at the end of this document.

Transfer function

Transfer function (wideband)

8December 14, 2012

B3748

434.42 MHz

Please read

cautions and warnings and

important notes

at the end of this document.

SAW Components

SAW filter

Data sheet

Transfer function (ultimate rejection)

9December 14, 2012

B3748

434.42 MHz

SAW Components

SAW filter

Data sheet

Please read

cautions and warnings and

important notes

at the end of this document.

References

Type B3748

Ordering code B39431B3748H110

Marking and package C61157-A7-A143

Packaging F61074-V8228-Z000

Date codes L_1126

S-parameters B3748_NB.s2p

B3748_WB.s2p

See file header for port/pin assignment table.B3748_NB.s2p

Soldering profile S_6001

RoHS compatible RoHS-compatible means that products are compatible with the

requirements according to Art. 4 (substance restrictions) of Di-

rective 2011/65/EU of the European Parliament and of the

CouncilofJune8th, 2011, onthe restrictionof theuse ofcertain

hazardous substances in electrical and electronic equipment

("Directive")withdueregardto theapplication ofexemptions as

per Annex III of the Directive in certain cases.

Matching coils See Inductor pdf-catalog

http://

www

.tdk.co.jp/tefe02/coil.htm#aname1

and Data Library for circuit simulation

http://www.tdk.co.jp/etvcl/index.htm

For further information please contact your local EPCOS sales office or visit our webpage at

ww.epcos.com .

Published by EPCOS AG

Systems, Acoustics, Waves Business Group

P.O. Box 80 17 09, 81617 Munich, GERMANY

EPCOS AG 2012. This brochure replaces the previous edition.

For questions on technology, prices and delivery please contact the Sales Offices of EPCOS AG or

he international Representatives.

Due to technical requirements components may contain dangerous substances. For information on

he type in question please also contact one of our Sales Offices.

10 December 14, 2012

Important notes

he 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

requirements 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

incumbent on the customer to check and decide whether an EPCOS product with the

properties described 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 life-saving 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.

3. 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

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

detailed 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. Conse-

quently, 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 foregoing for customer-speciﬁc products.

6. Unless otherwise agreed in individual contracts, all orders are subject to the current

version of the “General Terms of Delivery for Products and Services in the Electrical

Industry” published by the German Electrical and Electronics Industry Association

(ZVEI).

7. The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CeraLink, CSMP, CSSP, CTVS,

DeltaCap, DigiSiMic, DSSP, FilterCap, FormFit, MiniBlue, MiniCell, MKD, MKK, MLSC,

MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, SIFERRIT, SIFI, SIKOREL,

SilverCap, SIMDAD, SiMic, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse, WindCap

are trademarks registered or pending in Europe and in other countries. Further information

will be found on the Internet at www.epcos.com/trademarks.