Datasheet > B39431-B3710-U410

B39431-B3710-U410

更新时间： 2024-01-02 23:42:03

品牌	Logo	应用领域
爱普科斯 - EPCOS		LTE
页数	文件大小	规格书
8页	62K
描述
1 FUNCTIONS, 433.92MHz, SAW FILTER, ROHS COMPLIANT, SMD, DCC6C, 6 PIN

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B39431-B3710-U410 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	ROHS COMPLIANT, SMD, DCC6C, 6 PIN
Reach Compliance Code：	compliant	风险等级：	5
中心频率或截止频率 (fo/fc)：	433.92 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：	2.7 dB	JESD-609代码：	e4
长度：	3 mm	安装类型：	SURFACE MOUNT
功能数量：	1	最高工作温度：	85 °C
最低工作温度：	-40 °C	输出阻抗：	50 OHM Ω
物理尺寸：	L3.0XB3.0XH1.1 (mm)/L0.118XB0.118XH0.043 (inch)	端子面层：	GOLD OVER NICKEL
宽度：	3 mm	Base Number Matches：	1

B39431-B3710-U410 数据手册

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SAW Components

SAW filter

B3710

433.92 MHz

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 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 “Applications Notes”.

Please read cautions and warnings and

important notes at the end of this document.

December 17, 2012

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