1N4728A

Overview

The onsemi 1N4728A is a silicon unidirectional voltage regulator diode designed for general-purpose applications. It features a nominal Zener voltage of 3.3 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 1 W and operates within a temperature range from -65 °C to +200 °C. Packaged in the DO-41 axial leaded format, it utilizes metallurgically bonded construction with an oxide passivated die. The component requires a test current of 76 mA for specification verification.

Feature Summary

• Hermetically sealed glass package with double slug type construction
• Oxide passivated die for enhanced stability
• Metallurgically bonded construction for reliability

Applications

• Voltage regulation circuits
• Input voltage protection for microcontrollers
• Overvoltage protection circuits

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the 1N4728A part number is utilized by multiple semiconductor producers including Vishay, Motorola, and Panjit. Confirm that the selected unit matches the required 1 W power rating and DO-41 package style. Ensure compliance with RoHS directives if applicable to the assembly process. Cross-reference datasheets to confirm exact electrical tolerances and thermal characteristics before integration.

Selection Notes

Select this component for low-voltage reference applications requiring high thermal stability due to its extended operating temperature range up to 200 °C. The DO-41 through-hole package facilitates manual assembly and prototyping. Verify that the circuit design accommodates the 76 mA test current requirement to ensure accurate voltage regulation performance under expected load conditions.

Part Context

This component belongs to the standard 1N47xx series of one-watt Zener diodes. These devices are widely used in discrete electronics for basic voltage clamping and regulation tasks. The 1N4728A specifically targets the 3.3 V segment of the series, providing a stable reference point for digital logic families and analog signal conditioning stages.

Replacement Considerations

Compatible substitutes include Vishay 1N4728A, Motorola 1N4728A, and Panjit 1N4728A. Ensure replacement units maintain the same DO-41 package dimensions and 1 W power dissipation rating.