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参数资料
| 型号： | B39921B3726U410 |
| 厂商： | EPCOS Inc |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | FILTER SAW 915MHZ REMOTE SMD |
| 标准包装： | 9,000 |
| 频率： | 915MHz 中心 |
| 带宽： | 10MHz |
| 滤波器类型： | 带通 |
| 插入损耗： | 2.6dB |
| 应用： | 远程控制 |
| 封装/外壳： | 6-SMD，无引线 |
| 安装类型： | 表面贴装 |
| 包装： | 带卷 (TR) |
| 高度（最大）： | 0.043"（1.10mm） |
| 尺寸/尺寸： | 0.118" L x 0.118" W（3.00mm x 3.00mm） |
SAW Components
SAW RF filter
B3726
915.00 MHz
Data sheet
ESD protection of SAW filters
SAW filters are E lectro S tatic D ischarge 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 3 rd 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.
Cs1
Cs3
Cs1
Cs3
Lp2
to output
matching
Lp2
to output
matching
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.
Cs1
Cs3
Lp2
to output
matching
Fig. 3 3 rd 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”.
Please read cautions and warnings and
important notes at the end of this document.
6
May 16, 2013
相关PDF资料 |
PDF描述 |
|---|---|
| B39921B3728U410 | FILTER SAW 915MHZ REMOTE SMD |
| B39921B4301F210 | FILTER SAW 915.00MHZ SMD |
| B39941B3514H910 | FILTER SAW 881.5/942.5MHZ SMD |
| B39941B4121U510 | FILTER SAW 942.5MHZ LOWLOSS SMD |
| B39941B7721C910 | FILTER SAW 942.5MHZ LOWLOSS SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| B39921-B3726-U410 | 制造商:EPCOS 制造商全称:EPCOS 功能描述:SAW RF filter Short range devices |
| B39921B3728U410 | 功能描述:信号调节 915MHz 50ohms B3728 2.2dB 5V RoHS:否 制造商:EPCOS 产品:Duplexers 频率:782 MHz, 751 MHz 频率范围: 电压额定值: 带宽: 阻抗:50 Ohms 端接类型:SMD/SMT 封装 / 箱体:2.5 mm x 2 mm 工作温度范围:- 30 C to + 85 C 封装:Reel |
| B39921B3857U410 | 功能描述:信号调节 RF 919.5MHZ RoHS:否 制造商:EPCOS 产品:Duplexers 频率:782 MHz, 751 MHz 频率范围: 电压额定值: 带宽: 阻抗:50 Ohms 端接类型:SMD/SMT 封装 / 箱体:2.5 mm x 2 mm 工作温度范围:- 30 C to + 85 C 封装:Reel |
| B39921-B3857-U410 | 制造商:EPCOS 制造商全称:EPCOS 功能描述:SAW Components Low-Loss Filter 919,5 MHz |
| B39921B3858U410 | 功能描述:信号调节 924.50MHZ RoHS:否 制造商:EPCOS 产品:Duplexers 频率:782 MHz, 751 MHz 频率范围: 电压额定值: 带宽: 阻抗:50 Ohms 端接类型:SMD/SMT 封装 / 箱体:2.5 mm x 2 mm 工作温度范围:- 30 C to + 85 C 封装:Reel |
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