1N4737A

Overview

The SMC Diode Solutions 1N4737A is a silicon unidirectional Zener voltage regulator diode housed in the DO-41 axial leaded glass package. It provides a nominal reference voltage of 7.5 V with a maximum tolerance of 5%. The device is rated for a maximum power dissipation of 1 W and operates within a temperature range of -55°C to +150°C. Key electrical characteristics include a maximum dynamic impedance of 4 Ω at a test current of 34 mA, a maximum reverse leakage current of 10 µA at 5 V, and a forward voltage drop of 1.2 V at 200 mA.

Feature Summary

• Hermetically sealed double slug type construction for high reliability
• Oxide passivated die design
• Metallurgically bonded internal structure

Applications

• Voltage regulation circuits
• Voltage reference applications
• Overvoltage protection

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the 1N4737A is a standardized JEDEC part number produced by multiple vendors including SMC Diode Solutions, onsemi, Vishay, and others. Confirm that the component meets the required RoHS compliance status and packaging format (such as tape and reel or cut tape) for your assembly process. Ensure the supplier documentation explicitly lists SMC Diode Solutions as the manufacturer if brand-specific traceability is required.

Selection Notes

Select this component for through-hole designs requiring a stable 7.5 V reference point. The DO-41 glass package offers robust thermal performance suitable for general-purpose regulation. Consider the 4 Ω dynamic impedance when designing for low-noise requirements. Verify that the 1 W power rating accommodates the expected operating current and ambient temperature conditions without exceeding the junction temperature limits.

Part Context

The 1N4737A belongs to the widely recognized 1N47xx series of one-watt Zener diodes. This series is standardized across the semiconductor industry, ensuring functional interchangeability between different manufacturers. The 7.5 V variant is commonly used in mid-range voltage regulation tasks where standard axial packages are preferred for manual or automated insertion.

Replacement Considerations

Direct substitutes include the 1N4737A from other manufacturers such as onsemi, Vishay, Nexperia, Littelfuse, and Microsemi. These parts share identical electrical specifications and mechanical dimensions, allowing for pin-for-pin replacement in existing designs.