1N4737CP/TR8

Overview

The Microchip Technology 1N4737CP/TR8 is a silicon 1-watt Zener diode in the 1N4728AP to 1N4764AP series. It provides voltage regulation with a nominal Zener voltage of 7.5V and a tight tolerance of ±2%, indicated by the 'C' suffix. The device operates within an ambient temperature range of -65°C to +150°C and features a plastic DO-41 (DO-204AL) axial lead package. Electrical characteristics include a maximum dynamic impedance of 4.0 Ohms at a test current of 34 mA, a maximum reverse leakage current of 10 µA, and a maximum regulator current of 121 mA.

Feature Summary

• Provides precise voltage regulation with a standard ±2% tolerance on nominal Zener voltage.
• Features flexible axial-lead mounting terminals suitable for through-hole applications.
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards.
• Moisture classified as Level 1 per IPC/JEDEC J-STD-020B, requiring no dry pack.

Applications

• Voltage regulation over broad operating current and temperature ranges
• General purpose reference circuits requiring tight voltage tolerances
• Power supply protection and clamping applications

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic construction, 'C' denotes the ±2% voltage tolerance, and 'TR8' specifies the tape and reel packaging format. Confirm RoHS compliance status if applicable, as devices may require an additional 'e3' suffix for lead-free plating. Ensure the manufacturer prefix aligns with specific military screening requirements if necessary.

Selection Notes

Select this component when a 7.5V Zener reference requires tighter stability than standard 5% or 10% variants. The plastic encapsulation offers lower thermal resistance compared to glass-body options. Verify that the 1W power dissipation rating and the specific dynamic impedance meet the circuit's load regulation needs. Consider the axial lead form factor for board space constraints.

Part Context

This part belongs to the 1N4728A through 1N4764A series of silicon Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers a wide voltage selection from 3.3V to 100V. The 1N4737 variant specifically targets the 7.5V nominal breakdown region, offering a balance between low-current operation and moderate power handling capabilities within the 1-watt class.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4737A or 1N4737AP diodes. For surface mount replacements, consider SMAJ4737A or MLL4737A equivalents. Ensure replacement components match the ±2% tolerance requirement and the DO-41 package dimensions if axial leads are mandatory.