1N5237B

Single Zener Diodes Overview

The Microchip Technology 1N5237B is a 0.5 W glass axial-lead Zener diode in the DO-35 package. It provides an 8.2 V nominal voltage with ±5% tolerance (B suffix). Key electrical parameters include a maximum reverse current of 3 µA at 6.5 V, a Zener impedance of 8 Ohms at 0.25 mA, and a forward voltage of 1.5 V max at 200 mA. The device operates from -65°C to +175°C and features a temperature coefficient of +0.062 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for robust environmental protection
• Capable of regulating voltage across a broad operating current and temperature range
• Inherently radiation hard per MicroNote 050 specifications
• Minimal capacitance characteristics suitable for high-frequency applications

Single Zener Diodes Applications

• Voltage regulation circuits requiring stable reference levels
• Overvoltage protection stages in electronic systems
• Clamping applications within signal processing paths

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required JEDEC registration and tolerance suffix. Confirm RoHS compliance status if applicable, as standard versions may differ from e3 suffix variants. Ensure the ordering quantity aligns with bulk or tape-and-reel packaging options available from authorized distributors. Cross-reference thermal resistance requirements against your specific PCB copper pad layout.

Single Zener Diodes Selection Notes

Select this component when a 500 mW power dissipation rating in a DO-35 package is sufficient for the circuit design. The 8.2 V breakdown voltage suits applications needing precise mid-range regulation. Consider the +0.062 %/°C temperature coefficient for thermal stability requirements. Verify that the 8 Ohm dynamic impedance meets the noise and ripple specifications of the target application.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators. The series offers a wide selection of voltages from 2.4 V to 200 V. Standard tolerances are provided with A (±10%) and B (±5%) suffixes. Tighter tolerances are available with C (±2%) and D (±1%) suffixes. The series is JEDEC registered.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF package. Glass body axial-leaded DO-7 equivalents are also offered as alternatives for similar form-factor requirements.