1N4737A

Overview

The Lumimax Optoelectronic Technology 1N4737A is a silicon unidirectional Zener diode housed in a DO-41 glass package. It provides a nominal Zener voltage of 7.5 V with a tolerance of ±5%. The device supports a maximum power dissipation of 1 W and features a low maximum dynamic impedance of 4 Ω. Electrical characteristics are defined at an ambient temperature of 25°C, including a forward voltage of 1.2 V at 200 mA and a reverse leakage current of 10 µA at 5 V.

Feature Summary

• Glass passivated junction construction for enhanced stability
• Low Zener impedance and regulation factor for precise voltage control
• High temperature soldering capability guaranteed under specified conditions

Applications

• Voltage regulation circuits
• Reference voltage sources
• Overvoltage protection applications

Procurement Notes

Verify the manufacturer designation as Lumimax Optoelectronic Technology against the specific datasheet provided. Confirm that the component utilizes the standard JEDEC DO-41 glass molded body package. Ensure compliance with the specified electrical parameters, particularly the 7.5 V nominal voltage and 4 Ω maximum impedance values documented in the official specifications.

Selection Notes

Select this component when a stable 7.5 V reference is required within a through-hole axial lead configuration. The DO-41 glass package offers robust thermal performance suitable for high-temperature environments. Consider the ±5% tolerance and 1 W power rating to ensure adequate margin for the intended circuit load and operating conditions.

Part Context

This part belongs to the 1N47xxA series of general-purpose Zener diodes manufactured by Lumimax Optoelectronic Technology. The series covers a wide voltage range from 3.3 V to 75 V, all sharing the same DO-41 glass package and 1 W power dissipation rating. This specific model represents the 7.5 V variant within that standardized lineup.

Replacement Considerations

Standard industry equivalents include the 1N4737A from other manufacturers such as Microchip or onsemi. Verify that substitute parts maintain the identical DO-41 package dimensions and meet the 7.5 V ±5% voltage specification to ensure direct compatibility.

FAQ

What is the maximum junction temperature for the 1N4737A?

The maximum junction temperature (Tj) for this component is 200°C.

How is polarity indicated on the device?

Polarity is marked by a color band on the glass body, which denotes the cathode end.