SAW Components
SAW filter
Automotive telematics
Series/type:
Ordering code: B3912
B39242B3912U410
Date:
Version: January 30, 2013
2.2
EPCOS AG 2015. Reproduction, publication and dissemination of this publicatio n, enclosures hereto and the information
contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
2January 30, 2013
B3912
2448.50 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 automotive telematics
Features
■Package size 3.0 x 3.0 x 1.1 mm3
■Package code DCC6C
■RoHS compatible
■Approximate weight 0.037 g
■Package for Surface Mount Technology
(SMT)
■Ni, gold-plated terminals
■Lead free soldering compatible with J - STD20C
■AEC-Q200 qualified component family
■Electrostatic Sensitive Device (ESD)
Pin configuration
■2 Input
■5 Output
■1,3,4,6 Case ground
3January 30, 2013
B3912
2448.50 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 = –40 ˚C to +85 ˚C
Terminating source impedance: ZS=50Ωand matching network
Terminating load impedance: ZL=50Ωand matching network
min. typ.
@ 25 ˚C max.
Center frequency fC— 2448.50 — MHz
Maximum insertion attenuation αmax
2400.00 ... 2497.00 MHz — 1.7 3.0 dB
Amplitude ripple (p-p) ∆α
2400.00 ... 2497.00 MHz — 0.7 2.0 dB
VSWR
Input 2400.00 ... 2497.00 MHz — 1.5 2.0
Output 2400.00 ... 2497.00 MHz — 1.5 2.0
Attenuation α
50.00 ... 2300.00 MHz 20 24 — dB
2600.00 ... 3500.00 MHz 22 26 — dB
3500.00 ... 5000.00 MHz 25 33 — dB
4January 30, 2013
B3912
2448.50 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 PS20 dBm source impedance 50 Ω
5January 30, 2013
B3912
2448.50 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)
Cp1 = 1.0 pF
Ls2 = 2.7 nH
Ls3 = 2.7 nH
Cp4 = 1.0 pF
6January 30, 2013
B3912
2448.50 MHz
Please read
cautions and warnings and
important notes
at the end of this document.
SAW Components
SAW filter
Data sheet
Transfer function
Transfer function (wideband)
7January 30, 2013
B3912
2448.50 MHz
SAW Components
SAW filter
Data sheet
Please read
cautions and warnings and
important notes
at the end of this document.
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 three figures show recommended “ESD matching” topologies.
For wideband filters the high-pass ESD matching structure needs to be at least of 3rd order to
ensure a proper matching for any impedance value of antenna and SAW filter input. The required
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 3rd order high-pass structure for basic ESD protection
In all three figures the shunt inductor Lp2 could be replaced by a shorted microstrip with proper
length and width. If this configuration is possible depends on the operating frequency and
available pcb space.
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 “Applications Notes”.
MLC1
Cs1
Lp2
Cs3
to output
matching
Dp1
Lp2
Cs3
Cs1
to output
matching
Lp2
Cs3
Cs1
to output
matching
8January 30, 2013
B3912
2448.50 MHz
Please read
cautions and warnings and
important notes
at the end of this document.
SAW Components
SAW filter
Data sheet
References
Type B3912
Ordering code B39242B3912U410
Marking and package C61157-A7-A67
Packaging F61074-V8228-Z000
Date codes L_1126
S-parameters B3912_NB.s2p, B3912_WB.s2p
see file header for port/pin assignment table
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,ontherestrictionoftheuseofcertain
hazardous substances in electrical and electronic equipment
("Directive")withdueregardtotheapplicationofexemptionsas
per Annex III of the Directive in certain cases.
Moldability Before using in overmolding environment, please contact your
EPCOS sales office.
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
w
ww.epcos.com .
Published by EPCOS AG
Systems, Acoustics, Waves Business Group
P.O. Box 80 17 09, 81617 Munich, GERMANY
EPCOS AG 2013. This brochure replaces the previous edition.
For questions on technology, prices and delivery please contact the Sales Offices of EPCOS AG or
t
he international Representatives.
Due to technical requirements components may contain dangerous substances. For information on
t
he type in question please also contact one of our Sales Offices.
9January 30, 2013
Important notes
T
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.
