1N4749E3/TR13

Overview

The Microchip Technology 1N4749E3/TR13 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (DO-204AL) axial-lead package. It provides voltage regulation with a nominal Zener voltage of 24 V and a standard tolerance of ±10%. The device operates within a temperature range of -65°C to +150°C and features a maximum dynamic impedance of 25 ohms at a test current of 10.5 mA. It includes RoHS compliance via the 'e3' suffix and tape-and-reel packaging indicated by the 'TR13' suffix.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for through-hole applications
• Constructed with void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection in power supply inputs
• Clamping applications for transient voltage suppression

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'e3' indicates RoHS compliance, while 'TR13' specifies tape-and-reel packaging. Confirm the manufacturer origin, as Microsemi products are now managed under Microchip Technology. Ensure the component meets the specific JEDEC registration requirements for the 1N4749A type before integration into production designs.

Selection Notes

Select this component when a 24 V regulation point is needed with a 1 W power dissipation capability. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the ±10% tolerance if tighter precision is not required, or look for C/D suffix variants for 2%/1% tolerances. Ensure the operating environment stays within the specified -65°C to +150°C range for reliable performance.

Part Context

This part belongs to the popular 1N4728AP through 1N4764AP series of 1.0 watt Zener diodes. The series covers a voltage selection from 3.3 to 100 volts. The 'P' suffix denotes plastic construction, which provides lower thermal resistance than the glass-body 'G' suffix option. These devices are moisture classified as Level 1 and do not require dry packing.

Replacement Considerations

Direct substitutes include other 1N4749A variants with different suffixes for tolerance or packaging, such as 1N4749A (no suffix for 10% tolerance, loose pack) or 1N4749AP (plastic, loose pack). Surface mount equivalents like SMAJ4749A are available but require layout changes.