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SAW Components
SAW filter
Short range devices
Series/type: Ordering code: Date: Version:
B3780 B39431B3780Z810 July 24, 2008 2.2
(c) EPCOS AG 2008. 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 Data sheet
Application
s Low-loss RF filter for remote control receivers s Balanced and unbalanced operation possible
B3780 433.92 MHz
Features
s s s s s s s s s s
Package size 3.8 x 3.8 x 1.5 mm3 Package code QCC8B RoHS compatible Approximate weight 0.07 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)
s s s s s s
1 2 5 6 4,8 3,7
Input ground (recommended) or input Input (recommended) or input ground Output (recommended) or output ground Output ground (recommended) or output Case - ground To be grounded
1) The recommended pin configuration usually offers best suppression of electrical crosstalk. The filter characteristics refer to this configuration.
Please read cautions and warnings and important notes at the end of this document.
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SAW Components SAW filter Data sheet
Characteristics Temperature range for specification: Terminating source impedance: Terminating load impedance: T = -40 C to +105 C ZS = 50 and matching network ZL = 50 and matching network min. Center frequency Minimum insertion attenuation incl. loss in matching elements excl. loss in matching elements Pass band (relative to min) 433.645 ... 434.165MHz 433.645 ... 434.195MHz Filter bandwidth rel 3 dB Relative attenuation (relative to min) rel 10.00 ... 414.00 MHz 414.00 ... 425.00 MHz 425.00 ... 431.50 MHz 431.50 ... 433.00 MHz 434.92 ... 443.00 MHz 443.00 ... 530.00 MHz 530.00 ... 670.00 MHz 670.00 ... 830.00 MHz 830.00 ... 1000.00 MHz 1000.00 ... 2500.00 MHz Impedance for pass band matching2) Input: ZIN = RIN || CIN Output: ZOUT = ROUT || COUT
1) 2)
B3780 433.92 MHz
fC min
--
typ. @ 25 C 433.92
max. -- MHz
-- --
2.0 1.6
2.8 2.4
dB dB
-- -- 780
0.9 0.9 850
3.0 4.51) 920
dB dB kHz
48 42 28 18 14 36 55 45 60 43
53 47 33 21 18 41 60 50 65 48
-- -- -- -- -- -- -- -- -- --
dB dB dB dB dB dB dB dB dB dB
-- --
330 || 1.9 330 || 1.9
-- --
|| pF || pF
3.0dB for -40C to +85C 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 matching 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.
Maximum ratings Operable temperature range T Storage temperature range Tstg DC voltage VDC Source power PS -45/+125 C -45/+125 C 6 V 10 dBm source impedance 50
Please read cautions and warnings and important notes at the end of this document.
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July 24, 2008
SAW Components SAW filter Data sheet
Matching network to 50 (element values depend on pcb layout and equivalent circuit) Cp1 = Ls2 Ls3 = = 1.5 pF 39 nH 39 nH 1.5 pF
B3780 433.92 MHz
Cp4 =
Minimising the crosstalk For a good ultimate rejection a low crosstalk is necessary. Low crosstalk can be realised with a good 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 QCC8B package, pinning 2,5 (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.
Please read cautions and warnings and important notes at the end of this document.
4
July 24, 2008
SAW Components SAW filter Data sheet
ESD protection of SAW filters
B3780 433.92 MHz
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.
Ls3
MLC1
Ls3 to output matching to output matching
Lp2
Dp1
Lp2
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.
Ls2 to output matching
Cs1 to output matching
Lp1
Lp2
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".
Please read cautions and warnings and important notes at the end of this document.
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July 24, 2008
SAW Components SAW filter Data sheet
Transfer function
B3780 433.92 MHz
Transfer function (wideband)
Please read cautions and warnings and important notes at the end of this document.
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July 24, 2008
Important notes
Transfer function (ultimate rejection)
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July 24, 2008
SAW Components SAW filter Data sheet
B3780 433.92 MHz
References Type Ordering code Marking and package Packaging Date codes S-parameters Soldering profile RoHS compatible B3780 B39431B3780Z810 C61157-A7-A46 F61074-V8167-Z000 L_1126 B3780_SB.s2p B3780_WB.s2p S_6001 defined as compatible with the following documents: "DIRECTIVE 2002/95/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 27 January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic equipment. 2005/618/EC from April 18th, 2005, amending Directive 2002/95/EC of the European Parliament and of the Council for the purposes of establishing the maximum concentration values for certain hazardous substances in electrical and electronic equipment."
For further information please contact your local EPCOS sales office or visit our webpage at www.epcos.com . Published by EPCOS AG Surface Acoustic Wave Components Division P.O. Box 80 17 09, 81617 Munich, GERMANY (c) EPCOS AG 2008. This brochure replaces the previous edition. For questions on technology, prices and delivery please contact the Sales Offices of EPCOS AG or the international Representatives. Due to technical requirements components may contain dangerous substances. For information on the type in question please also contact one of our Sales Offices.
Please read cautions and warnings and important notes at the end of this document.
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July 24, 2008
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 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. 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. The warnings, cautions and product-specific notes must be observed. 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. 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 foregoing for customer-specific products. 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). The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CSSP, CTVS, DSSP, MiniBlue, MKK, MLSC, MotorCap, PCC, PhaseCap, PhaseMod, SIFERRIT, SIFI, SIKOREL, SilverCap, SIMDAD, 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
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July 24, 2008

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