ROSEMONT, Ill — Littelfuse, Inc., an industrial technology manufacturing company shaping solutions for the safe and efficient transfer of electrical energy, today 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.”
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
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 1 V. Both devices let design teams move quickly from inferior protection schemes to a solution engineered for today’s most sensitive, highest-speed interfaces.
Frequently Asked Questions
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 4.5 V with capacitance as low as 0.17 pF, providing strong ESD protection for high-speed interfaces without signal degradation.
What are the clamping voltage and capacitance specifications? The AQ4315-01ETG has a typical clamping voltage of 6.5 V during a 7 A peak surge current and 0.25 pF of capacitance. The SP4315-01WTG clamps at 6.5 V with a 7 A peak current surge and has 0.17 pF of capacitance. Both withstand ESD strikes up to ±15 kV contact / ±20 kV air per IEC 61000-4-2.
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.
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.
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. Sample requests are accepted through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit Littelfuse.com.
For More Information
Additional information is available on the AQ4315–01ETG and SP4315–01WTG Series product pages. To contact Sophia Hu for technical support, please visit the Littelfuse website.
