Datasheet > B39931B3919U410

B39931B3919U410

更新时间： 2024-02-21 15:14:01

品牌	Logo	应用领域
东电化 - TDK		LTE
页数	文件大小	规格书
8页	90K
描述
SAW Filter, 1 Function(s), 925MHz, 6 Pin(s), Ceramic, ROHS COMPLIANT, SMD, DCC6C, 6 PIN

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B39931B3919U410 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
Reach Compliance Code：	compliant	风险等级：	5.6
中心频率或截止频率 (fo/fc)：	925 MHz	滤波器类型：	SAW FILTER
高度：	1.1 mm	输入阻抗：	50 OHM
最大插入损耗：	1.9 dB	长度：	3 mm
安装类型：	SURFACE MOUNT	功能数量：	1
端子数量：	6	最高工作温度：	105 °C
最低工作温度：	-40 °C	输出阻抗：	50 OHM Ω
包装材料：	CERAMIC	物理尺寸：	L3.0XB3.0XH1.1 (mm)/L0.118XB0.118XH0.043 (inch)
筛选级别：	AEC-Q200	子类别：	SAW Filters
宽度：	3 mm	Base Number Matches：	1

B39931B3919U410 数据手册

SAW Components

SAW RF filter

Data sheet

B3919

925.00 MHz

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 3^rdorder 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

to output

matching

to output

matching

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.

Cs1

Cs3

to output

matching

Lp2

Fig. 3 3^rdorder 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 “Application Notes”.

Please read cautions and warnings and

important notes at the end of this document.

May 15, 2013

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