STMicroelectronics - Dot-sized ESD-clamping diodes guards smart objects from failures

STMicroelectronics – Dot-sized ESD-clamping diodes guards smart objects from failures

ST’s new 0.6 x 0.3-mm single-line ESD-protection diodes quickly clamp transients to a low voltage thanks to their snap-back technology with 5.8 V trigger voltage. With a respective capacitance of 7.5 pF and 6 pF, both the unidirectional ESDZL5-1F4 and the bidirectional ESDZV5-1BF4 ensure high-speed signal application compatibility for space-constrained smart objects.

KEY FEATURES
• Efficiency and robustness
• Ultra-low clamping voltage: 7 V after 30 ns (IEC 61000-4-2 ESD contact discharge)
• 0201 flexible and standard package (0.6 x 0.3 mm)
• Very low capacitance down to 6 pF
• Very low leakage current below 100 nA
• Up to 18 kV IEC 61000-4-2 ESD contact discharge
• Up to 7 A 8/20 μs peak pulse current

KEY BENEFITS
• Easy design and PCB layout
• System immunity against ESD
• Smaller form factor with more functionalities

KEY APPLICATIONS
• Smart watches
• Fitness devices
• Smart watches
• Access control devices
• Point-of-sale terminals
• Active cables and connectors
• Healthcare devices
• Industrial sensors
• Wearables
• Smartphones and portable devices
• Laptops and peripherals

ULTRA-LOW CLAMPING VOLTAGE

Snapback effect

The 0201 Z-series behaves differently from standard ESD diodes, which start to clamp from the breakdown voltage VBR value (corresponding to the avalanche voltage of the diode) following a slope linked to the dynamic resistance RD of the diode. The clamping voltage is given by VCL = VBR + RD • IPP, where IPP is the peak pulse current. The 0201 Z-series ESD diodes offer a Snapback effect that will not turn on until reaching their trigger voltage (VTRIG). Once VTRIG reached, then the voltage will suddenly decrease down the holding voltage (VH). In this case, VCL= VH + RD • IPP. This new protection technology also offers lower dynamic resistance (RD) than standard ESD diodes. The Snapback effect combined with improved dynamic resistance leads to a drastic reduction of the clamping voltage.