SMPZ3921B-M3/85A

Single Zener Diodes Overview

The SMPZ3921B-M3/85A is a surface mount power voltage-regulating diode from Vishay's eSMP series, housed in an SMP (DO-220AA) package. It provides a nominal Zener voltage of 6.8 V with a tolerance range of 6.46 V to 7.14 V at a test current of 55.1 mA. The device features a maximum Zener impedance of 2.5 Ω and a reverse leakage current of 400 μA at 5.2 V. It supports a maximum DC Zener current of 221 mA and operates within a junction temperature range of -65 °C to +150 °C.

Single Zener Diodes Feature Summary

• Very low profile construction typical of 1.0 mm height for automated placement
• Low Zener impedance and low regulation factor for stable performance
• Halogen-free, RoHS-compliant base part number with industrial grade classification
• Matte tin plated leads solderable per J-STD-002 and JESD 22-B102 standards

Single Zener Diodes Applications

• General purpose voltage regulation circuits
• Industrial equipment protection applications
• Surge protection designs

Single Zener Diodes Procurement Notes

Verify the specific suffix /85A indicates a 13-inch diameter plastic tape and reel delivery mode with a base quantity of 10,000 units. Confirm compliance requirements including RoHS, REACH SVHC status, and MSL level 1 classification against J-STD-020 specifications before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a 6.8 V reference or clamp is required in a compact surface mount footprint. Ensure thermal management accounts for derating curves above 75 °C lead temperature. Verify that the 2.5 Ω dynamic impedance meets circuit sensitivity requirements compared to higher voltage variants in the same series.

Single Zener Diodes Part Context

This device belongs to the SMPZ39XB through SMPZ3940B family of surface mount power voltage-regulating diodes. All members share the SMP (DO-220AA) package and similar thermal characteristics, differing primarily in their specified Zener voltage ranges and corresponding test currents defined in the electrical characteristics table.

Single Zener Diodes Replacement Considerations

Direct substitutes include other SMPZ3921B variants with different packaging codes such as SMPZ3921B-M3/84A for 7-inch reels. Cross-referencing requires matching the 6.8 V nominal voltage, DO-220AA package dimensions, and equivalent thermal resistance values.

Single Zener Diodes FAQ

What does the color band on the SMPZ3921B-M3/85A indicate?

The color band denotes the cathode end of the diode.

Is the SMPZ3921B-M3/85A suitable for high-temperature environments?

Yes, it supports an operating junction and storage temperature range from -65 °C to +150 °C.