1N4689TA

Overview

The 1N4689TA is a 5.1V, 0.5W unidirectional voltage regulator diode manufactured by onsemi. It utilizes silicon technology and is housed in a DO-204AH (DO-35) hermetically sealed glass package with two pins. The device features a double slug type construction and metallurgically bonded design. It operates within a temperature range of -65°C to 175°C. Key electrical parameters include a nominal Zener voltage of 5.1V, power dissipation of 500mW, reverse leakage current of 10µA at 3V, and forward voltage of 1.1V at 200mA.

Feature Summary

• Hermetically sealed glass construction for environmental protection
• Double slug type design for mechanical stability
• Metallurgically bonded internal structure

Applications

• Voltage regulation circuits
• Overvoltage protection systems
• Reference voltage generation

Procurement Notes

Verify the manufacturer marking matches onsemi specifications. Confirm the package code corresponds to DO-204AH/DO-35. Ensure the Zener voltage tolerance aligns with system requirements. Check for lead-free compliance if required by project standards. Validate the operating temperature range against environmental conditions.

Selection Notes

Select this component when a precise 5.1V reference is needed in a compact axial package. Consider the 500mW power rating for thermal management. The hermetic seal is suitable for harsh environments. Verify that the through-hole mounting style fits the PCB layout constraints.

Part Context

This part belongs to the 1N4678 series of 500mW DO-35 glass Zener diodes. It shares mechanical characteristics with other devices in the group, such as corrosion-resistant leads and specific soldering limits. The series covers a wide voltage range from 1.8 to 200 volts.

Replacement Considerations

Cross-reference with other manufacturers offering 1N4689 equivalents in DO-35 packages. Ensure pinout and electrical tolerances match exactly. Verify hermetic sealing requirements are met by alternative sources.