1SMB5940 R5G

Single Zener Diodes Overview

The 1SMB5940 R5G is a surface mount Zener diode manufactured by Taiwan Semiconductor Corporation. It belongs to the 1SMB5926–1SMB5956 series, offering a nominal Zener voltage of 43V with a 5% tolerance. The device operates within a junction temperature range of -55°C to +150°C and features a DO-214AA (SMB) package. Key electrical parameters include a maximum DC power dissipation of 3W at 75°C lead temperature, a test current of 36mA, and a maximum Zener impedance of 8.7Ω.

Single Zener Diodes Feature Summary

• Glass passivated chip junction for enhanced reliability
• Low inductance design suitable for high-speed switching
• Moisture sensitivity level 1 compliant with J-STD-020
• Halogen-free construction meeting IEC 61249-2-21 standards

Single Zener Diodes Applications

• Switching mode power supplies (SMPS)
• On-board DC/DC converters
• Power adapters
• Lighting applications

Single Zener Diodes Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm RoHS compliance and halogen-free status against current regulatory requirements. Ensure storage conditions maintain moisture sensitivity level 1 integrity prior to soldering. Validate part marking codes against datasheet specifications to prevent counterfeit substitution.

Single Zener Diodes Selection Notes

Select this component when a 43V regulation point is required in space-constrained surface mount designs. The DO-214AA package optimizes board area compared to axial leads. Consider the 3W power rating and thermal resistance values for heat dissipation planning. Verify that the 5% voltage tolerance aligns with circuit precision requirements.

Single Zener Diodes Part Context

This device is part of the 1SMB5926–1SMB5956 series from Taiwan Semiconductor. The series covers Zener voltages from 11V to 200V in the SMB package. The 'R5G' suffix indicates specific packaging and environmental compliance attributes defined by the manufacturer for automated placement compatibility.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 43V nominal voltage, 5% tolerance, and DO-214AA footprint. Verify equivalent power dissipation ratings and thermal characteristics. Cross-reference dynamic impedance and leakage current specifications to ensure circuit performance parity.