Littelfuse Unveils Ultra-Low Capacitance TVS Diode Arrays with Industry’s Lowest Clamping Voltage

Littelfuse Unveils Ultra-Low Capacitance TVS Diode Arrays with Industry’s Lowest Clamping Voltage

New AQ4315-01ETG and SP4315-01WTG TVS diode arrays protect high-speed automotive and consumer interfaces from ESD without sacrificing signal integrity

Littelfuse, Inc.  (NASDAQ: LFUS), an industrial technology manufacturing company shaping solutions for the safe and efficient transfer of electrical energy, 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 1V 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 4.5V to 6.5V while suppressing ESD transients ranging from 8,000V to 20,000V down to well under 10V 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.”

Key Features and Benefits

• Ultra-low-clamping voltage: typical 4.5V to 6.5V during an ESD strike, as much as a tenfold improvement over comparable TVS diodes.
• Ultra-low capacitance: 0.25pF (AQ4315-01ETG) or 0.17pF (SP4315-01WTG) to preserve high-speed signal integrity.
• High ESD withstand: ±15kV contact and ±20kV 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: 50nA maximum to minimize power consumption in battery-powered and always-on designs.
• Broad protection margin: suppresses ESD transients of 8,000V to 20,000V to well under 10V 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

The AQ4315-01ETG and SP4315-01WTG extend the Littelfuse SPA® diode portfolio into a new class of ultra-low-voltage ESD protection as automotive and consumer interfaces adopt progressively lower data-line voltages, some running below 1V. Both devices let design teams move quickly from inferior protection schemes to a solution engineered for today’s most sensitive, highest-speed interfaces.

AQ4315-01ETG and SP4315-01 FAQs

1. What makes the AQ4315-01ETG and SP4315-01WTG different from typical TVS diodes?
   Most TVS diodes force a tradeoff between low-clamping voltage and low capacitance. The AQ4315-01ETG and SP4315-01WTG combine clamping as low as 4.5V with capacitance as low as 0.17pF, providing strong ESD protection for high-speed interfaces without signal degradation.
2. What are the clamping voltage and capacitance specifications?
   The AQ4315-01ETG has a typical clamping voltage of 6.5V during a 7A peak surge current and 0.25pF of capacitance. The SP4315-01WTG clamps at 6.5V with a 7A peak current surge and has 0.17pF of capacitance. Both withstand ESD strikes up to ±15kV contact / ±20kV air per IEC 61000-4-2.
3. What packages are the AQ4315-01ETG and SP4315-01WTG available in?
   The AQ4315-01ETG ships in an automotive-grade SOD-882/DFN1006 package (1.0 x 0.6 mm); the SP4315-01WTG ships in a space-saving 0201 WLCSP flip-chip package (0.63 x 0.33 mm) for area-constrained consumer designs.
4. What applications are the AQ4315-01ETG and SP4315-01WTG designed for?
   The AQ4315-01ETG targets automotive interfaces such as ADAS, DisplayPort, GMSL, GVIF, LVDS, and automotive Ethernet. The SP4315-01WTG targets consumer and computing interfaces, including Thunderbolt 5.0, USB 3x/USB4, DisplayPort, LVDS, and Ethernet.
5. When will the AQ4315-01ETG and SP4315-01WTG be available?
   Littelfuse plans to make both devices available for sampling and production starting October 20, 2026, through Littelfuse and its global distributor network.

Availability

The AQ4315-01ETG and SP4315-01WTG Series TVS diode arrays are available in tape-and-reel format in quantities of 10,000.

Source: Littelfuse

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