1N5257B/TR

Single Zener Diodes Overview

The Microchip Technology 1N5257B/TR is a 0.5 W glass axial-lead Zener diode with a nominal voltage of 33 V and a ±5% tolerance. It operates within a temperature range of -65°C to +175°C, featuring a maximum reverse current of 100 µA at 24 V and a dynamic impedance of 58 Ω at 3.8 mA test current. The device utilizes a DO-35 package and includes a tape-and-reel option indicated by the TR suffix.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features minimal capacitance for high-frequency applications
• Inherently radiation hard per MicroNote 050
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage reference circuits
• Overvoltage protection
• Clamping applications

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required electrical parameters, including the 33 V nominal voltage and 5% tolerance. Confirm the presence of the TR suffix indicates tape-and-reel packaging rather than bulk. Ensure compatibility with the specified operating temperature range and power dissipation limits before finalizing procurement.

Single Zener Diodes Selection Notes

Select this component when a precise 33 V reference is needed in a standard axial-lead package. The B suffix guarantees tighter 5% tolerance compared to the A suffix. Consider the TR suffix if automated assembly equipment requiring reel packaging is utilized. Verify thermal derating requirements against the application's ambient temperature conditions.

Single Zener Diodes Part Context

This component belongs to the 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators. These devices are JEDEC registered and offer a wide selection of voltages from 2.4 to 200 volts. The series is characterized by its glass axial-lead construction and availability in various tolerance levels and screening options.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N5257A (10% tolerance) or other manufacturers' 1N5257 variants. Ensure replacement components match the DO-35 package dimensions and 500 mW power rating.