1N748A

Single Zener Diodes Overview

The onsemi 1N748A is a single silicon Zener diode housed in a DO-35 glass axial package. It provides a nominal Zener voltage of 3.9 V with a tolerance of ±5%. The device dissipates up to 500 mW at lead temperatures below 75°C and operates within a temperature range of -65°C to +200°C. Key electrical parameters include a maximum Zener impedance of 23 Ohms, a reverse leakage current of 10 µA at 1V, and a forward voltage of 1.5V maximum at 200mA.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation through Zener breakdown characteristics
• Features a hermetically sealed glass case for environmental protection
• Supports high thermal stability across an extended operating temperature range

Single Zener Diodes Applications

• Voltage reference circuits
• Overvoltage protection stages
• Clipping and clamping applications

Single Zener Diodes Procurement Notes

Verify the manufacturer origin as specifications vary between Fairchild Semiconductor and onsemi following corporate acquisition. Confirm the specific datasheet revision matches the required performance criteria. Ensure the component meets RoHS compliance requirements if applicable to the target assembly process.

Single Zener Diodes Selection Notes

Select this component when a precise 3.9 V reference is needed in a standard through-hole configuration. Consider the 23 Ohm impedance value for dynamic load requirements. Verify that the 500 mW power dissipation rating accommodates the expected current levels without exceeding thermal limits.

Single Zener Diodes Part Context

This part belongs to the 1N746A through 1N759A series of low-power Zener diodes. These components share the same DO-35 package and general construction but differ in their specific regulated voltage outputs. The series covers a wide range of voltages from approximately 2.4 V to 12 V.

Single Zener Diodes Replacement Considerations

JANTX1N748A-1 (Microchip) offers similar electrical characteristics with military qualification standards.