DATA SHEET book, halfpage M3D302 BZA408B Quadruple bidirectional ESD transient voltage suppressor Product specification Supersedes data of 1998 Jun 05 1998 Oct 15 Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor FEATURES BZA408B PINNING • ESD rating >15 kV, according to IEC1000-4-2 PIN • SOT457 surface mount package DESCRIPTION 1 • Non-clamping range: −5 V to +5 V cathode 1 2, 5 ground • Channel separation: >70 dB 3 cathode 2 • Low reverse current: <100 nA 4 cathode 3 • Low diode capacitance: <75 pF. 6 cathode 4 APPLICATIONS • Protection of equipment, connected to data and transmission lines, against voltage surges caused by electrostatic discharge e.g: handbook, halfpage 6 5 4 1 2 3 6 5 1 2 4 – Computers and peripherals – Audio and video equipment – Communication systems – Medical equipment Top view – Portable electronics. 3 MAM409 Marking code: Z8. DESCRIPTION Fig.1 Simplified outline (SOT457) and symbol. 4-bit wide monolithic bidirectional ESD transient voltage suppressor in a six lead SOT457 (SC-74) package. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT Per diode (pin 2 and / or 5 connected to ground) IZSM non-repetitive peak reverse current tp = 1 ms; square pulse; see Fig.2 − 2 A PZSM non-repetitive peak power tp = 1 ms; square pulse − 20 W Tstg storage temperature −65 +150 °C Tj junction temperature −65 +150 °C 1998 Oct 15 2 Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor BZA408B THERMAL CHARACTERISTICS SYMBOL Rth j-s PARAMETER CONDITIONS thermal resistance from junction to soldering point VALUE UNIT 340 K/W MAX. UNIT one or more diodes loaded ELECTRICAL CHARACTERISTICS Tj = 25 °C unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. Per diode (pin 2 and / or 5 connected to ground) − 5 V 5.5 − V VRWM working reverse voltage VR reverse voltage Itest = 5 mA VZSM non-repetitive peak reverse voltage tp = 1 ms; IZSM = 2 A − 10 V IR reverse current VR = VRWM − 100 nA Cd diode capacitance see Fig.3 VR = 0; f = 1 MHz − 75 pF VR = 5 V; f = 1 MHz − 55 pF 70 − dB αch (p to p) pin to pin channel separation note 1; see Fig.4 Note 1. αch (p to p) is measured as follows: a −7 dBs sinewave of 400 Hz is connected to e.g. pin 6 and a −7 dBs sinewave of 1 kHz to pin 1. The 1 kHz signal of pin 1 is measured on pin 6 by means of a spectrum analyser with an input impedance of 1 MΩ. So αch (p to p) equals the 1 kHz level on pin 1 minus the 1 kHz level on pin 6. For the 400 Hz signal the same measurement is done in the opposite way. 1998 Oct 15 3 Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor BZA408B GRAPHICAL DATA MGR557 10 MGR558 80 handbook, halfpage handbook, halfpage Cd (pF) IZSM (A) 60 1 40 10−1 10−2 10−1 20 1 tp (ms) 10 0 1 2 3 4 VR (V) 5 Tj = 25 °C; f = 1 MHz. Fig.2 Maximum non-repetitive peak reverse current as a function of pulse time. Fig.3 Diode capacitance as a function of reverse voltage; typical values. handbook, full pagewidth coaxial cable with SMB connector SPECTRUM ANALYZER 1 MΩ SIGNAL GENERATOR SIGNAL GENERATOR DUT 600 Ω 1 6 600 Ω f = 1 kHz −7 dBs 2 5 f = 400 Hz −7 dBs 3 4 Fig.4 Channel separation measurement setup. 1998 Oct 15 4 MGR556 Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor handbook, full pagewidthESD TESTER 450 Ω RZ BZA408B RG 223/U 50 Ω coax 10× ATTENUATOR DIGITIZING OSCILLOSCOPE note 1 CZ 50 Ω Note 1: attenuator is only used for open socket high voltage measurements IEC1000-4-2 network CZ = 150 pF; RZ = 330 Ω 1/4 BZA408B vertical scale = 100 V/Div horizontal scale = 50 ns/Div vertical scale = 10 V/Div horizontal scale = 50 ns/Div GND GND unclamped +1 kV ESD voltage waveform (IEC1000-4-2 network) clamped +1 kV ESD voltage waveform (IEC1000-4-2 network) GND GND vertical scale = 10 V/Div horizontal scale = 50 ns/Div vertical scale = 100 V/Div horizontal scale = 50 ns/Div unclamped −1 kV ESD voltage waveform (IEC1000-4-2 network) clamped −1 kV ESD voltage waveform (IEC1000-4-2 network) Fig.5 ESD clamping test set-up and waveforms. 1998 Oct 15 5 MGR560 Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor BZA408B APPLICATION INFORMATION Typical bidirectional application A quadruple bidirectional transient suppressor in a SOT457 package makes it possible to protect four separate lines using only one package. One simplified example is shown in Fig.6. handbook, full pagewidth audio in L audio in R audio out L audio out R TVSET/VCR SCART CONNECTOR BZA408B GND MGR559 Fig.6 Scart connector protection. Device placement and printed-circuit board layout Circuit board layout is of extreme importance in the suppression of transients. The clamping voltage of the BZA408B is determined by the peak transient current and the rate of rise of that current (di/dt). Since parasitic inductances can further add to the clamping voltage (V = L di/dt) the series conductor lengths on the printed-circuit board should be kept to a minimum. This includes the lead length of the suppression element. In addition to minimizing conductor length the following printed-circuit board layout guidelines are recommended: 1. Place the suppression element close to the input terminals or connectors. 2. Keep parallel signal paths to a minimum. 3. Avoid running protection conductors in parallel with unprotected conductors. 4. Minimize all printed-circuit board loop areas including power and ground loops. 5. Minimize the length of the transient return path to ground. 6. Avoid using shared transient return paths to a common ground point. 1998 Oct 15 6 Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor BZA408B PACKAGE OUTLINE Plastic surface mounted package; 6 leads SOT457 D E B y A HE 6 X v M A 4 5 Q pin 1 index A A1 1 2 bp e c 3 Lp w M B detail X 0 1 2 mm scale DIMENSIONS (mm are the original dimensions) UNIT A A1 bp c D E e HE Lp Q v w y mm 1.1 0.9 0.1 0.013 0.40 0.25 0.26 0.10 3.1 2.7 1.7 1.3 0.95 3.0 2.5 0.6 0.2 0.33 0.23 0.2 0.2 0.1 OUTLINE VERSION SOT457 1998 Oct 15 REFERENCES IEC JEDEC EIAJ SC-74 7 EUROPEAN PROJECTION ISSUE DATE 97-02-28 Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor BZA408B DEFINITIONS Data Sheet Status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. 1998 Oct 15 8 Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor NOTES 1998 Oct 15 9 BZA408B Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor NOTES 1998 Oct 15 10 BZA408B Philips Semiconductors Product specification Quadruple bidirectional ESD transient voltage suppressor NOTES 1998 Oct 15 11 BZA408B Philips Semiconductors – a worldwide company Argentina: see South America Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. +61 2 9805 4455, Fax. +61 2 9805 4466 Austria: Computerstr. 6, A-1101 WIEN, P.O. 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The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Printed in The Netherlands 115104/00/02/pp12 Date of release: 1998 Oct 15 Document order number: 9397 750 04313