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ESD Protection Diode with Resistors

Product Details

Key Features

Parametric specs for ESD Protection Diode Arrays
Protection Method 7.5V Snap-Back Zener with Two 5 Ohm Resistors
# Channels 1
C (pF) 100
Package/Pins TSOC/6
Budgetary
Price (See Notes)
0.42
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Simplified Block Diagram

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Parameters

Parametric specs for ESD Protection Diode Arrays
Protection Method 7.5V Snap-Back Zener with Two 5 Ohm Resistors
# Channels 1
C (pF) 100
Package/Pins TSOC/6
Budgetary
Price (See Notes)
0.42

Key Features

  • 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

Applications/Uses

Description

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.

Simplified Block Diagram

DS9503: Typical Application Circuit DS9503: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .