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参数资料
| 型号： | B39242B3912U410 |
| 厂商： | EPCOS Inc |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | FILTER SAW 2448.5MHZ SMD |
| 标准包装： | 9,000 |
| 频率： | 2.45GHz Center |
| 带宽： | 97MHz |
| 滤波器类型： | 带通 |
| 插入损耗： | 1.7dB |
| 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 filter
B3912
2448.50 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.
7
January 30, 2013
相关PDF资料 |
PDF描述 |
|---|---|
| B39242B7841C710 | FILTER SAW 2.44175GHZ SMD |
| B39242B9410K610 | FILTER SAW 2.44175GHZ SMD |
| B39242B9413K610 | FILTER SAW 2.44175GHZ SMD |
| B39252B4041U410 | FILTER SAW 2.4485 GHZ MOBILE SMD |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| B39242B3918U410 | 功能描述:CERAMIC WIDEBAND FRONTENDFILTER 制造商:epcos (tdk) 系列:* 零件状态:有效 标准包装:9,000 |
| B39242B4346P810 | 功能描述:WLAN BAW-AEC 制造商:qualcomm (rf360 - a qualcomm & tdk joint venture) 系列:B4346 零件状态:在售 频率 - 中心:2.442GHz 带宽:79MHz 插入损耗:1.9dB 等级:AEC-Q200 应用:WLAN 安装类型:表面贴装 封装/外壳:5-SMD，无引线 高度（最大值）:0.018"（0.46mm） 大小/尺寸:0.055" 长 x 0.043" 宽（1.40mm x 1.09mm） 标准包装:1 |
| B39242B4360P810 | 功能描述:WLAN SAW 制造商:qualcomm (rf360 - a qualcomm & tdk joint venture) 系列:B4360 零件状态:在售 频率 - 中心:2.44175GHz 带宽:83.5MHz 插入损耗:2.1dB 等级:AEC-Q200 应用:蓝牙 安装类型:表面贴装 封装/外壳:5-SMD，无引线 高度（最大值）:0.018"（0.46mm） 大小/尺寸:0.043" 长 x 0.035" 宽（1.09mm x 0.89mm） 标准包装:1 |
| B39242B5133U410 | 制造商:TDK 功能描述:SAW FILTER |
| B39242B7766C911 | 功能描述:信号调节 CSSPLUS 2441.75 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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