SMPZ3933B-E3/85A

Single Zener Diodes Overview

The SMPZ3933B-E3/85A is a surface mount power voltage-regulating diode from Vishay General Semiconductor, housed in an SMP (DO-220AA) package. It features a nominal Zener voltage of 22 V with a range of 20.9 V to 23.1 V at a test current of 0.25 mA. The device supports a maximum DC Zener current of 68 mA and exhibits a maximum Zener impedance of 17.0 Ω at the test current. Power dissipation reaches 1500 mW at a lead temperature of 75 °C and 500 mW at an ambient temperature of 25 °C. The operating junction temperature ranges from -65 °C to +150 °C.

Single Zener Diodes Feature Summary

• Very low profile construction with a typical height of 1.0 mm
• Low Zener impedance for improved regulation performance
• Low regulation factor ensuring stable voltage output
• Meets MSL level 1 per J-STD-020 with LF maximum peak of 260 °C

Single Zener Diodes Applications

• General purpose voltage regulation
• Industrial circuit protection
• Overvoltage protection applications

Single Zener Diodes Procurement Notes

Verify the complete part number including the suffix '-E3/85A' to ensure correct packaging and material compliance. The 'M3' base part number indicates halogen-free, RoHS-compliant, and industrial grade materials. Confirm the reel size corresponds to the '/85A' designation for 10,000 units on a 13-inch diameter plastic tape. Cross-reference the datasheet revision date to ensure access to the latest thermal and electrical specifications before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a 22 V nominal regulation voltage is required in a compact surface mount form factor. The SMP package offers a low profile suitable for space-constrained designs. Ensure the application current does not exceed the maximum DC Zener current of 68 mA. Verify that the thermal management strategy can handle the specified power dissipation limits at the expected ambient or lead temperatures to maintain reliability within the -65 °C to +150 °C operating range.

Single Zener Diodes Part Context

This device belongs to the SMPZ39XB through SMPZ3940B series of surface mount power voltage-regulating diodes. The series covers a wide Zener voltage range from 5.6 V to 43 V. All variants share the same SMP (DO-220AA) mechanical outline and general feature set, differing primarily in their specific Zener voltage ratings and associated impedance characteristics. The series is designed for automated placement and general-purpose regulation tasks.

Single Zener Diodes Replacement Considerations

Direct substitutes within the same Vishay series include SMPZ3932B and SMPZ3934B, which offer adjacent voltage ratings of 20 V and 24 V respectively. When replacing, verify that the new part's Zener impedance and maximum current ratings meet the circuit requirements. Ensure the replacement maintains the same SMP package footprint and polarity marking conventions.