CIRCUIT PROTECTION Littelfuse launches ultra-low-capacitance tvs diode arrays

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Littelfuse, Inc has announced AQ4315-01ETG and SP4315-01WTG, two new bidirectional TVS diode arrays (SPA diodes) that combine industry-leading low-clamping voltage with ultra-low capacitance to protect today’s fastest automotive and consumer data interfaces from electrostatic discharge (ESD) without compromising signal integrity.

High-speed interfaces such as automotive ADAS, DisplayPort, and USB4 are increasingly vulnerable to ESD damage as data-line voltages drop below 1 V to save energy and reduce EMI. Conventional TVS diodes force a tradeoff between low-clamping voltage and low capacitance, and many competing devices advertise a lower breakdown voltage while still clamping at levels that leave protected chips exposed to damage. The AQ4315-01ETG and SP4315-01WTG close that gap, holding clamping voltage to a typical 4.5 V to 6.5 V while suppressing ESD transients ranging from 8,000 V to 20,000 V down to well under 10 V at the protected device, an 800- to 2,000-times reduction in the voltage and current reaching the IC and keeping it safely within its safe operating area (SOA).

“The industry is moving toward lower-voltage, higher-speed interfaces faster than traditional ESD protection can keep up,” said Sophia Hu, Assistant Product Marketing Manager, Diode Arrays, Littelfuse Protection Business Unit. “The AQ4315-01ETG and SP4315-01WTG give designers an extremely low-clamping voltage without the capacitance penalty, so they gain stronger ESD and surge protection while preserving the signal integrity and board space their next-generation automotive and consumer designs demand.”

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Key features and benefits

• Ultra-low-clamping voltage: typical 4.5 V to 6.5 V during an ESD strike, as much as a tenfold improvement over comparable TVS diodes

• Ultra-low capacitance: 0.25 pF (AQ4315-01ETG) or 0.17 pF (SP4315-01WTG) to preserve high-speed signal integrity

• High ESD withstand: ±15 kV contact and ±20 kV air per IEC 61000-4-2; the AQ4315-01ETG also qualifies to ISO10605

• Automotive-grade reliability: AQ4315-01ETG is AEC-Q101 qualified and PPAP capable, rated -40°C to 150°C

• Industry-standard packaging: SOD-882/DFN1006 (AQ4315-01ETG) and 0201 WLCSP flip-chip (SP4315-01WTG) for fast, easy design-in

• Low leakage current: 50 nA maximum to minimize power consumption in battery-powered and always-on designs

• Broad protection margin: suppresses ESD transients of 8,000 V to 20,000 V to well under 10 V at the protected device

Target markets and applications

• Automotive ADAS, DisplayPort, and Gigabit Multimedia Serial Link (GMSL) interfaces

• Gigabit Video Interface (GVIF) and low voltage differential signaling (LVDS) links

• 2.5G/5G/10G automotive and consumer Ethernet

• Thunderbolt 5.0, USB 3x, and USB4 consumer computing interfaces

• Consumer DisplayPort and other high-speed data line interfaces

• Industrial machine-to-machine communication protocols and legacy USB interfaces

• Space-constrained wearable and portable consumer electronics

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