BAS521BX

Single Diodes Overview

The BAS521BX is a high-voltage switching diode manufactured by Nexperia USA Inc., housed in an ultra-small SOD-523 (SC-79) leadless surface-mount package. It supports a repetitive peak reverse voltage of 250 V and a maximum average forward current of 250 mA. The device features a low reverse recovery time of 50 ns, ensuring rapid switching capabilities. Electrical characteristics include a maximum forward voltage of 1.25 V at 200 mA and a leakage current of 100 nA at 200 V reverse bias. Capacitance is limited to 2 pF at 0 V. The component operates within a junction temperature range up to 150 °C and meets AEC-Q101 automotive qualification standards.

Single Diodes Feature Summary

• High-speed switching performance with a reverse recovery time of 50 ns
• Ultra-small leadless SMD plastic package for space-constrained designs
• Automotive-grade reliability through AEC-Q101 qualification

Single Diodes Applications

• High-speed switching circuits
• General-purpose switching applications
• Voltage clamping functions
• Reverse polarity protection

Single Diodes Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging details such as reel size or tape-and-reel specifications. Confirm that the requested variant matches the required automotive qualification status and package dimensions. Ensure compatibility with standard reflow soldering profiles for the SOD-523 footprint. Cross-reference the part number with the latest datasheet revision to validate all electrical parameters before finalizing procurement orders.

Single Diodes Selection Notes

Select this component when designing circuits requiring high-voltage blocking capability combined with minimal physical footprint. The low capacitance and fast recovery time make it suitable for high-frequency signal processing. Verify that the thermal resistance characteristics align with the system's heat dissipation requirements. Ensure the operating voltage does not exceed the specified repetitive peak reverse voltage limits under all transient conditions.

Single Diodes Part Context

This device belongs to the BAS521B series of high-voltage switching diodes produced by Nexperia. It utilizes the SC-79 (SOD523) package, which is designed for automated surface-mount assembly. The product line emphasizes miniaturization while maintaining robust electrical performance for automotive and industrial environments. The marking code for this specific type is designated as 'S2'.

Single Diodes Replacement Considerations

BAS21XV2T5G is a confirmed direct substitute part number available from onsemi.