1N4733A-T

Overview

The Diodes Incorporated 1N4733A-T is a discontinued 1.0W silicon planar Zener diode housed in a DO-41 glass package. It provides a nominal Zener voltage of 5.1V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and features a maximum reverse leakage current of 10µA at 1V. Key electrical parameters include a test current of 49mA, a maximum Zener impedance of 7Ω at the test current, and a thermal resistance of 175°C/W.

Feature Summary

• Utilizes a hermetically sealed glass DO-41 case for robust environmental protection
• Designed for high power dissipation up to 1.0 Watt with derating capabilities above 50°C
• Features low inductance construction suitable for general voltage regulation applications

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection stages in electronic systems
• Clipping and clamping circuits for signal conditioning

Procurement Notes

This specific part number is officially marked as obsolete and discontinued by the manufacturer. No alternate replacement part is currently available from Diodes Incorporated for this exact component. Procurement efforts should focus on identifying equivalent specifications from other manufacturers or utilizing alternative series components that meet the required voltage and power ratings.

Selection Notes

When selecting a replacement, verify that the substitute component matches the 5.1V nominal Zener voltage and maintains a ±5% tolerance. Ensure the new device supports a minimum 1.0W power dissipation rating and fits within the DO-41 through-hole form factor. Confirm that the operating temperature range meets the application's requirement of -65°C to +175°C.

Part Context

The 1N4733A belongs to the broader 1N4728A through 1N4761A series of 1.0W Zener diodes produced by Diodes Incorporated. This series covers a wide voltage range from 3.3V to 75V. The 'T' suffix specifically denotes the Tape & Reel packaging format, intended for automated assembly processes, distinguishing it from the Ammo Pack variant.

Replacement Considerations

Diodes Incorporated states there is no direct alternate part for this obsolete component. Engineers must source cross-manufacturers equivalents such as Vishay or onsemi variants that adhere to the same JEDEC DO-41 outline and electrical characteristics.

FAQ

Is the 1N4733A-T still in production?

No, the datasheet explicitly marks the 1N4728A-1N4761A series, including the 1N4733A-T, as obsolete with no alternate part provided by Diodes Incorporated.

What is the maximum Zener impedance for this device?

According to the electrical characteristics table, the maximum Zener impedance (ZZT) is 7Ω when measured at the test current of 49mA.