1N5221B

Single Zener Diodes Overview

The SMC Diode Solutions 1N5221B is a single silicon Zener diode housed in a DO-35 glass axial package. It provides a nominal Zener voltage of 2.4 V with a tolerance of ±5%. The device supports a maximum power dissipation of 0.5 W and operates within a junction temperature range of -65°C to +200°C. Key electrical characteristics include a maximum dynamic impedance of 30 Ω and a reverse leakage current of 5 µA at 2 V.

Single Zener Diodes Feature Summary

• Low reverse leakage current for stable voltage regulation
• Low Zener impedance ensuring high stability
• Glass encapsulation suitable for automatic mounting

Single Zener Diodes Applications

• Voltage reference circuits
• Overvoltage protection
• General-purpose voltage regulation

Single Zener Diodes Procurement Notes

Verify the manufacturer designation on the component marking, as the 1N5221B specification is an industry standard distributed by multiple vendors. Confirm that the specific batch meets RoHS compliance requirements if lead-free assembly is mandated. Ensure the DO-35 package dimensions match the target PCB footprint before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a low-voltage reference near 2.4 V is required in a through-hole configuration. The DO-35 package offers robust mechanical stability compared to smaller surface-mount alternatives. Consider the thermal derating curves if operation exceeds ambient temperatures significantly above 25°C to maintain the 0.5 W power rating safely.

Single Zener Diodes Part Context

This part belongs to the 1N52-series of epitaxial Zener diodes manufactured by SMC Diode Solutions. The series covers a wide voltage range from 2.4 V to 75 V, all sharing the same DO-35 glass case form factor. These devices are designed for general-purpose applications requiring reliable voltage regulation with high stability and low impedance characteristics.

Single Zener Diodes Replacement Considerations

Cross-reference with other manufacturers' 1N5221B parts, such as those from Central Semiconductor or Taychipst, which share identical electrical specifications and DO-35 packaging. Verify pinout polarity, where the cathode is typically denoted by a color band.