1N4737CP/TR12

Overview

The Microchip Technology 1N4737CP/TR12 is a silicon 1-watt Zener diode in the 1N4728AP through 1N4764AP series. It provides voltage regulation with a nominal Zener voltage of 6.8 V and a tight tolerance of ±2%, indicated by the 'C' suffix. The device operates within a 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 3.5 Ohms at a test current of 37 mA, a maximum reverse current of 10 µA, and a steady-state power dissipation of 1.0 watts.

Feature Summary

• Provides precise voltage regulation with ±2% tolerance for stable reference applications
• Utilizes void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Offers flexible axial-lead mounting terminals suitable for standard PCB layouts
• Ensures reliability with moisture classification Level 1 requiring no dry pack

Applications

• Voltage regulation circuits requiring high precision
• Reference voltage sources in electronic systems
• Overvoltage protection components

Procurement Notes

Verify the specific manufacturer origin, as the datasheet references Microsemi Scottsdale Division while the brand is listed as Microchip Technology. Confirm that the TR12 suffix corresponds to the tape and reel packaging option described in the mechanical section. Ensure compliance requirements match the tin-lead or RoHS compliant annealed matte-tin plating options available for this series.

Selection Notes

Select this component when a 6.8 V regulation point with ±2% accuracy is required. The 1-watt power rating supports higher current loads compared to lower-power variants. The plastic construction offers lower thermal resistance than glass-body options. Verify that the operating environment stays within the specified -65°C to +150°C range for optimal performance.

Part Context

This part belongs to the JEDEC registered 1N4728A to 1N4764A series of silicon Zener diodes. The series covers a wide voltage selection from 3.3 to 100 volts. The 'P' suffix denotes plastic encapsulation, while the 'C' suffix specifies the tighter 2% voltage tolerance. These devices are designed for general-purpose voltage regulation tasks.

Replacement Considerations

Equivalent parts include other 1N4737 variants with matching 6.8 V ratings and ±2% tolerance. Surface mount equivalents such as MLL4737A are available for space-constrained designs. Verify that any substitute maintains the same 1-watt power dissipation and axial lead compatibility if direct replacement is needed.