B39401B3742H110 EPCOS Inc, B39401B3742H110 Datasheet - Page 6

• Manufacturer Part Number: B39401B3742H110
• Description: FILTER SAW 400MHZ SMD
• Manufacturer: EPCOS Inc
• Series: B3742r

Specifications of B39401B3742H110

• Frequency: 400MHz Center
• Package / Case: 0.118" L x 0.118" W x 0.039" H (3.00mm x 3.00mm x 1.00mm)
• Insertion Loss: 2.3dB
• Bandwidth: 250kHz
• Filter Type: Bandpass
• Applications: Remote Control
• Mounting Type: Surface Mount
• Product: RF SAW Filters
• Frequency Range: 399.875 MHz to 400.125 MHz
• Impedance: 50 Ohms
• Operating Temperature Range: - 40 C to + 105 C
• Voltage Rating: 6 Volts
• Termination Style: SMD/SMT
• Frequency Max: 400.125MHz
• Bandpass Insertion Loss Max: 3dB
• Impedance Typ: 50ohm
• Filter Case: SMD
• No. Of Pins: 6
• Reel Quantity: 9000
• Frequency Min: 399.875MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 495-3923-2

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
In cases where minor ESD occur, following simplified “ESD matching” topologies can be used
alternatively.
Fig. 3 shunt L – series 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.
SAW Components
SAW filter
Lp1
Ls2
Lp2
Ls3
to output
matching
to output
matching
6
Fig. 2 Suppressor diode plus ESD matching
Fig. 4 series C – shunt L matching
September 28, 2007
Dp1
Cs1
Lp2
Ls3
Lp2
400.00 MHz
B3742
to output
matching
to output
matching