This DS9503 is an ESD protection device for 1-Wire® interfaces. In contrast to the DS9502, the DS9503 includes two 5Ω isolation resistors on chip. Although 5Ω are negligible during communication, they represent a high impedance relative to the conducting diode during an ESD event. Thus, the diode absorbs the energy while the resistors further isolate and protect the circuit at the other side of the package. If used with circuits that already have a strong ESD-protection at their I/O port, the ESD protection level is raised to more than 27kV (IEC 801-2 Reference model). In case of abnormal ESD hits beyond its maximum ratings the DS9503 will eventually fail "short" thus preventing further damage.

During normal operation the DS9503 behaves like a Zener diode. When the voltage exceeds the trigger voltage, the I/V characteristic of the device will "snapback" allowing the same or higher amount of current to flow, but at a significantly lower voltage. As long as a minimum current or voltage is maintained, the device will stay in the "snapback mode." If the voltage or the current falls below the holding voltage or holding current, the device will abruptly change to its normal mode and conduct only a small leakage current.
DS9503:典型应用电路 DS9503:典型应用电路 放大+


  • Zener characteristic with voltage snap-back to protect against ESD hits
  • High avalanche voltage, low leakage and low capacitance avoid signal attenuation
  • Compatible to all 5V logic families
  • Space-saving, low-inductance TSOC surface-mount package
  • On-chip 5 ohm resistors for isolation at both anode and cathode terminals
  • Industrial temperature range

请查看具体的参数规格 ESD Protection Diode Arrays (13)

Part NumberProtection Method# ChannelsC
(See Notes)
DS9503 7.5V Snap-Back Zener with Two 5 Ohm Resistors1100
$0.40 @1k

Pricing Notes:
产品可靠性报告: DS9503.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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类型 编号 标题
系统板6304MAXREFDES132#: 1-Wire Shield