BAS70H-QX

Overview

The BAS70H-QX is a surface-mount diode array consisting of two series-connected switching diodes in a compact SOT-23 package. Designed for high-frequency applications, it offers fast switching times typically under 4ns, making it suitable for RF and signal processing circuits. As a silicon-based component, the BAS70H-QX provides reliable performance across a wide temperature range (-65°C to +150°C). Its dual-diode configuration allows for flexible circuit design while maintaining space efficiency on PCBs. The device is commonly used in telecommunications equipment, radio frequency identification (RFID) systems, and high-speed digital circuits.

Structure and Working Principle

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The BAS70H-QX contains two independent PN-junction diodes connected in series within a single package. Each diode features a silicon semiconductor structure optimized for fast charge carrier movement, enabling rapid switching between conducting and non-conducting states. When forward-biased, the diodes allow current flow with a typical voltage drop of 0.715V at 100mA. In reverse bias, they exhibit low leakage current (typically 50nA at 70V). The series connection provides higher reverse voltage capability while maintaining the fast switching characteristics essential for high-frequency applications.

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Key Features

The BAS70H-QX stands out for its exceptional switching speed, with reverse recovery time typically less than 4ns. This makes it particularly valuable in applications where signal integrity at high frequencies is critical. Additional notable features include a low forward voltage (max 1V at 100mA), which helps minimize power loss in circuits. The device also offers good thermal characteristics, with a junction-to-ambient thermal resistance of 357°C/W. Its small SOT-23 package (2.9mm × 2.4mm × 1.1mm) enables high-density PCB layouts while providing adequate heat dissipation.

Application Areas

Primary applications for the BAS70H-QX include RF switching circuits in mobile communication devices, where its fast switching speed preserves signal quality. It's also commonly used in high-speed data transmission systems, including USB and HDMI interfaces. In industrial electronics, the diode array finds use in signal conditioning circuits, voltage clamping applications, and high-frequency rectification. The automotive sector employs it in RF modules for keyless entry systems and tire pressure monitoring, benefiting from its reliability across temperature extremes.

Maintenance and Precautions

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Proper handling of the BAS70H-QX requires attention to ESD protection during installation, as the device is sensitive to electrostatic discharge. Use appropriate grounding measures when working with these components. For optimal performance and longevity, avoid exceeding the maximum ratings (70V reverse voltage, 100mA forward current). Adequate PCB thermal design is recommended for applications with continuous high-current operation. Storage should be in dry, anti-static packaging at temperatures between -65°C and +150°C.

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B2B Procurement Guide

When procuring BAS70H-QX diodes in volume, verify manufacturer certifications to ensure component authenticity. Major distributors typically offer bulk pricing tiers starting at quantities of 1,000 pieces. Consider requesting samples for testing key parameters like switching speed and forward voltage before large purchases. Lead times vary by supplier but generally range from 2-8 weeks for custom orders. For critical applications, specify industrial or automotive grade versions with enhanced quality controls and temperature ranges.