1SMB5918BT3

Single Zener Diodes Overview

The onsemi 1SMB5918BT3G is a single-channel surface-mount Zener voltage regulator diode in the SMB (DO-214AA) package. It provides a nominal reverse Zener voltage of 5.1 V with a ±5% tolerance, operating within a range of 4.84 V to 5.36 V at a test current of 73.5 mA. The device supports a maximum steady-state power dissipation of 3.0 W at 75°C lead temperature and features a low thermal resistance from junction-to-lead of 25 °C/W. It exhibits a maximum dynamic impedance of 4 Ω at the test current and maintains a reverse leakage current of no more than 2 mA at 294 V. The component operates across an extended temperature range from -65°C to +150°C.

Single Zener Diodes Feature Summary

• Flat handling surface designed for accurate automated placement during manufacturing.
• ESD protection capability rated at Class 3 (>16 kV) per the Human Body Model.
• Modified L-bend leads provide increased contact area for robust circuit board bonding.

Single Zener Diodes Applications

• Voltage regulation in general-purpose electronic circuits.
• Protection against electrostatic discharge (ESD) events.
• Overvoltage clamping applications requiring high surge power handling.

Single Zener Diodes Procurement Notes

Verify that the ordering suffix matches 'BT3G' to ensure compliance with RoHS standards and correct packaging specifications. Confirm the presence of the SZ prefix if automotive qualification and PPAP capabilities are required for the specific application environment.

Single Zener Diodes Selection Notes

Select this component when a precise 5.1 V reference or clamp is needed in a compact surface-mount footprint. Ensure the design accommodates the 3.0 W power rating by managing thermal dissipation effectively above 75°C ambient conditions.

Single Zener Diodes Part Context

This part belongs to the 1SMB59xxBT3G series, which covers a wide voltage spectrum from 3.3 V to 200 V. All devices in this family share identical mechanical dimensions and thermal characteristics, differing only in their specific Zener voltage ratings and corresponding test currents.

Single Zener Diodes Replacement Considerations

Equivalent parts include the Microsemi SMBJ5918BTRE3 and generic SMBG5918A variants. Verify that substitute components match the 5.1 V nominal voltage, 3 W power rating, and DO-214AA package outline before integration.

Single Zener Diodes FAQ

What is the maximum surge power rating for non-repetitive pulses?

The datasheet provides a peak surge power curve indicating the device can withstand transient pulses significantly higher than its steady-state rating, defined by a 10/1000 µs waveform.

How does the device polarity appear physically?

The cathode terminal is indicated by a visible polarity band printed on the external plastic surface of the component.