1N4737A_T50R

Overview

The onsemi 1N4737A_T50R is a silicon unidirectional Zener diode housed in a DO-41 axial leaded glass package. It provides a nominal Zener voltage of 7.5 V with a tolerance of ±5%. The device dissipates up to 1 W at ambient temperatures up to 50°C, requiring derating above this threshold. Electrical characteristics include a maximum dynamic impedance of 4 Ω and a leakage current of 10 µA at 5 V reverse bias. It operates within a temperature range of -65°C to +200°C.

Feature Summary

• Hermetically sealed glass construction for environmental stability
• Double slug type design for high power handling
• Oxide passivated die for long-term reliability

Applications

• Voltage regulation circuits
• Overvoltage protection
• Reference voltage generation

Procurement Notes

Verify the specific T50R suffix against the manufacturer's official documentation to confirm packaging details such as tape and reel specifications. Ensure the component meets RoHS compliance requirements if applicable to your manufacturing process. Cross-reference the datasheet revision date to confirm the electrical parameters match your design specifications.

Selection Notes

Select this component when a standard 7.5 V reference is required in an axial through-hole configuration. Consider the 1 W power dissipation limit and thermal derating curve for high-temperature environments. Verify that the 4 Ω dynamic impedance meets the ripple rejection requirements of the target application circuit.

Part Context

This part belongs to the 1N47xx series of one-watt Zener diodes manufactured by onsemi. The series covers a wide voltage range from 3.3 V to 100 V using a consistent DO-41 glass package. These devices are designed for general-purpose voltage regulation and protection applications where reliable performance over a wide temperature range is necessary.

Replacement Considerations

Direct replacements include the 1N4737A (bulk) and 1N4737A,113. Verify pinout compatibility and ensure the substitute part supports the same DO-41 package and 1 W power rating.

FAQ

What is the maximum operating junction temperature?

The maximum operating and storage temperature range extends up to +200°C.

How is the cathode identified on the package?

The cathode is denoted by a color band on the glass body.