1N4678/TR

Single Zener Diodes Overview

The Microchip Technology 1N4678/TR is a Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 1.8 V with a standard tolerance of 5%. The device operates in the DO-7 (DO-204AA) axial-leaded glass package, suitable for through-hole mounting. It supports a maximum power dissipation of 500 mW and maintains an operating temperature range from -65 °C to +175 °C. Key electrical characteristics include a maximum reverse leakage current of 4 µA and a forward voltage of 1.1 V at a forward current of 200 mA.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features internal metallurgical bond construction similar to military requirements
• Offers flexible axial-lead mounting terminals for easy integration

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources requiring low capacitance
• Protection circuits against electrostatic discharge (ESD)

Single Zener Diodes Procurement Notes

Verify the specific suffix designation to confirm the package type and screening level. Confirm that the required voltage tolerance aligns with the standard 5% specification unless tighter tolerances are explicitly ordered. Ensure the thermal management design accommodates the specified power dissipation limits within the operational temperature range.

Single Zener Diodes Selection Notes

Select this component when a low-voltage reference near 1.8 V is required in an axial-leaded package. Consider the high maximum junction temperature capability for demanding environments. Evaluate the low leakage current specifications if precision in the off-state is critical for the circuit design.

Single Zener Diodes Part Context

This part belongs to the 1N4678 through 1N4717 series of 0.5 W Zener voltage regulators. The series covers a voltage selection from 1.8 V to 43 V. Variants with tighter tolerances or military screening options are available through specific prefixes and suffixes added to the base part number.

Single Zener Diodes Replacement Considerations

• 1N4678
• MSP1N4678-1

Single Zener Diodes FAQ

Does the 1N4678/TR have a hermetic seal?

Yes, the datasheet indicates the device is hermetically sealed in a glass DO-7 package.

Is the 1N4678 sensitive to electrostatic discharge?

No, the device is non-sensitive to ESD per MIL-STD-750 method 1020.