Ultra-low capacitance single-line ESD protection portfolio overview ‘Ultra Low’ (ULC) and ‘eXtra Low’ (XLC) capacitance ESD protection Is this presentation suited for you? Where do you stand with with high-speed port protection? Beginner? Intermediate? Advanced? I am not familiar with this subject. I am in the discovery phase and would like an overview and a basic understanding of the technology. I have a basic understanding of this subject. I would like to go deeper in details and tackle more aspects of this subject. I am very familiar with this subject. I would like to deepen my knowledge and become an expert. Click here to continue to next slide Click here to open new presentation Click here to open new presentation Overview Basic In depth 2 ESD protection is needed for Advanced technology with very thin lithography and gate oxide highly vulnerable to ESD Integrated electronics systems with PCBs having a high component density facilitate ESD coupling and propagation Core ICs such as microcontrollers, micro-processors, transceivers, etc. IC manufacturers reluctant to make robust embedded ESD protection diodes that would require a significant active area of their advanced and expensive technology. When the application uses RF (Wi-Fi or Bluetooth), a common-mode filter is required, in addition to ESD protection, to avoid RF performance decrease due to the EMI generated by the high-speed link. 3 Why ultra-low capacitance ? • The parasitic capacitance of ESD protection devices must be low enough to allow highspeed signals to be transmitted without degradation. • A high parasitic capacitance of ESD protection devices would increase too much the signal rise/fall time and prevent the communications. Example of the impact of parasitic capacitance on an HDMI signal simulated with discrete capacitance Time domain Fall time too HIGH Rise time too HIGH Frequency domain Bandwidth is too narrow 4 Single line for flexibility Example of PCB density • Single-line ESD protection provides flexibility on the PCB layout • ST offers industry-standard micro-packages such as the 0402 and 0201 to release designers from space constraints PCB area < 0.5 cm² 0402 0201 0.3 mm More than 3 x SMALLER AREA 0.5 mm 0.6 mm 1.0 mm 0.6 mm 0.6 mm² 0.18 mm² Thickness: 0.5 mm Thickness: 0.3 mm 5 Clamping voltage ESD response to IEC 61000-4-2 (+8 kV contact discharge) Example of ESDARF02-1BU2CK • The quality of protection lies in the clamping voltage of the ESD diodes • It is measured after 30 ns (the first peak voltage is in the nanosecond range; too fast to be significant) • 0.2 pF single-line ESD protection devices can clamp 8000 V ESD strikes down to 19 V ! IC to protect Clamping voltage 19 V after 30 ns 8000 V ESD IEC 61000-4-2 ESD protection diode 6 Main selection criteria • VBR Breakdown voltage higher than operating signal Above this voltage, the ESD protection devices will enter Clamping mode • CLINE Low parasitic capacitance (a consequence of high bandwidth) minimizing the impact on transmission line impedance • fc Cut-off frequency higher than high-speed signal bandwidth defined by the rise time value • Rd Dynamic resistance & VCL Clamping voltage to keep the protected IC safe Example of ESDARF02-1BU2CK fc @ -3 dB >> 10 GHz 7 Single-line portfolio 8 CLINE 0402 package 0201 package 1.0 x 0.6 x 0.5 mm 0.6 x 0.3 x 0.3 mm Line capacitance < 2 pF 1.5 pF (typical) 13.5 V @ 30 ns Ultra Low Capa ULC ESDAULC5-1BF4 Low clamping ESDAULC6-1U2 0.8 pF (typical) ESDARF01-1BF4 Low clamping 0.6 pF (typical) 6.8 V @ 30 ns, VBR = 0.6 V eXtra Low Capa XLC < 0.5 pF ESDAXLC6-1BT2 0.5 pF (maximum) ESDAXLC6-1BU2 0.4 pF (typical) 20 kV ESD ESDARF02-1BU2 ESDAXLC6-1MY2 0.24 pF (typical) 36 V @ 30 ns 0.35 pF (maximum) ESDARF02-1BU2CK 0.2 pF (typical) 30 V @ 30 ns Low clamping Let’s go further Basic presentation Intermediate product presentation soon available: ‘Understanding ST’s ESD ultra-low capacitance (XLC and ULC) series specification’ Application Notes: In-depth information Selection TVS short-pulse dynamic resistance measurement ... (AN4022) IEC 61000-4-2 standard testing (AN3353) Selection guide [pdf] www.st.com/esda-ultralowcapa 9 10 Thank you