1SMB5946BT3G

Single Zener Diodes Overview

The 1SMB5946BT3G is a 3 W Zener voltage regulator diode from the 1SMB59xxBT3G series manufactured by onsemi. It features a nominal reverse Zener voltage of 75 V with a tolerance of ±5%, ranging from 71.25 V to 78.75 V. The device operates within a temperature range of −65°C to +150°C and utilizes an SMB (DO-214AA) surface-mount package. Key electrical parameters include a maximum dynamic impedance of 140 Ω at the test current of 5 mA, a maximum leakage current of 1 µA at 56 V, and a forward voltage of 1.5 V maximum at 200 mA.

Single Zener Diodes Feature Summary

• ESD rating of Class 3 (> 16 kV) per Human Body Model
• Flat handling surface for accurate placement
• Package design supports top side or bottom circuit board mounting

Single Zener Diodes Applications

• Voltage regulation in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage generation in analog signal processing

Single Zener Diodes Procurement Notes

Verify that the ordering suffix BT3G corresponds to the specific ±5% tolerance and tape-and-reel packaging configuration required for the application. Confirm compliance with RoHS directives and lead-free status as indicated by the G suffix. Ensure the SZ prefix is not required if automotive site control or unique part numbering is necessary, as the standard 1SMB59xxBT3G lacks AEC-Q101 qualification.

Single Zener Diodes Selection Notes

Select this component when a 75 V nominal regulation level is needed with moderate precision. The SMB package offers a balance between power dissipation capability and board space efficiency compared to axial leads. Consider the thermal derating characteristics above 75°C for steady-state operation and verify that the peak surge power ratings accommodate transient events in the target circuit environment.

Single Zener Diodes Part Context

This device belongs to the 1SMB59xxBT3G series of 3 W plastic surface mount Zener diodes. The series provides a wide selection of Zener voltages from 3.3 V to 200 V. The 1SMB5946BT3G specifically addresses applications requiring stable voltage reference or clamping at approximately 75 V, utilizing silicon junction technology housed in a void-free, transfer-molded plastic case.

Single Zener Diodes Replacement Considerations

Cross-reference with other manufacturers' SMB packaged 3 W Zener diodes rated at 75 V ±5%. Verify equivalent dynamic impedance, leakage current limits, and thermal resistance values to ensure functional compatibility without redesigning the PCB footprint.