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Technical content
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 resistors for isolation at both anode and cathode terminals Industrial temperature range DS9503 ESD Protection Diode with Resistors www.maxim-ic.com SYMBOL AND CONVENTI ONS PACKAGE OUTLINE VCA A IC C TSOC SURFACE MOUNT PACKAGE 6 1 5 2 4 3 TOP VIEW SIDE VIEW 19-4699; 7/09
ORDERING INFORMATION
DS9503P+ 6-lead TSOC package DS9503P+T&R 6-lead TSOC package +Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel.
DESCRIPTION
This DS9503 is designed as an ESD protection device for 1–Wire MicroLAN interfaces. In contrast to the DS9502, the DS9503 includes two 5 isolation resistors on chip. Although 5 are negligible during communication, they represent a high impedance relati ve 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 that 27 kV (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 re gular Zener Diode. When the voltage exceeds the trigger voltage, the I/V characteristic of the devi ce will “snapback” allowing the same or higher amount of current to flow, but at a sign ificantly lower voltage. As long as a minimum current or voltage is maintained, the device will stay in the “snapback mod e”. 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.
DC CHARACTERISTICS Figure 1 VCA/V IC/A 1 2 3 4 5 6 7 8 9 10 11 1.0 0.8 0.6 0.4 0.2 I-TRIGGER V-TRIGGER VAV SEE DETAIL DRAWING DC CHARACTERISTICS DETAIL DRAWING Figure 2 TEST PULSE WAVEFORM Figure 3 TYPICAL APPLICATION Figure 4 2 of 4
ABSOLUTE MAXIMUM RATINGS* Operating Temperature –40°C to +85°C Storage Temperature –55°C to +125°C Soldering Temperature 260°C for 10 seconds Continuous DC Current Through Package 80 mA This is a stress rating only and functional operati on of the device at these or any other conditions above those indicated in the opera tion sections of this specifica tion is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability ELECTRICAL CHARACTERISTICS (-40C to +85C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Leakage Current IL 30 100 nA 1 Avalanche Voltage VAV 7.4 11.05 V 2,3 Trigger Voltage VTRIGGER 10 11 V 2, 4 Trigger Current ITRIGGER 1000 mA 4 Holding Voltage VHOLD 5.5 V 2,4 Holding Current IHOLD 11 mA 4 Forward Voltage (-10 mA) VF -0.7 -0.8 V 5 Forward Current (-0.7V) IF -10 -100 mA 5 Maximum Peak Current IPP 2.0 A 6 Continuous Current Through Diode ICC 80 mA Isolation Resistance RI 5 CAPACITANCE (tA=25C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Junction Capacitance (5V) CJ5 40 pF 2 Junction Capacitance (0V) CJ0 70 pF 2 THERMAL RESISTANCE PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Junction To Package RJC 75 K/W Junction To Ambient RJA 200 K/W NOTES: 1. At 7.0V. 2. All voltages are referenced from Cathode to Anode. 3. At 0.3 A. 4. Not production tested, guaranteed by design. 5. Typical values at room temperature. 6. See pulse specification.
REVISION HISTORY
Added “lead-free” note to the Ordering Information table. 1 Fixed the X/Y scale in Figure 1. 2 In the Electrical Characteristics table, changed the VAV specification maximum value to 11V; the VTRIGGER specification typical value to 10V and maximum value to 11V; the ITRIGGER specification typical value to a blank; and the IHOLD specification minimum value to an 11mA. 3 072209 Added note 4 (“Not production tested, guaranteed by design”) to the VTRIGGER, ITRIGGER, VHOLD, and IHOLD specifications in the Electrical Characteristics table. 3