1N6355US

Overview

The Microchip Technology 1N6355US is a military-qualified Zener voltage regulator featuring a B-SQ MELF package. It provides a nominal Zener voltage of 200 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and dissipates up to 0.5 W at an end cap temperature of 150°C. Key electrical parameters include a maximum reverse current of 80 µA at 150°C, a dynamic impedance of 1,800 Ω at the test current of 0.65 mA, and a thermal resistance from junction to end cap of 21 °C/W.

Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability.
• Qualified per MIL-PRF-19500/533 standards for critical applications where failure cannot be tolerated.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD).
• Surface mount equivalent of the JEDEC registered 1N6309 through 1N6355 series.

Applications

• High-reliability aerospace and defense systems.
• Voltage regulation in extreme temperature environments.
• Radiation-hardened electronic circuits.

Procurement Notes

Verify that the specific order includes the correct reliability level suffix if required, as commercial versions may differ in RoHS compliance. Confirm the package type matches the design requirements, noting that axial-leaded alternatives exist for the same voltage rating. Ensure compatibility with MIL-PRF-19500/533 specifications for mission-critical deployments.

Selection Notes

Select this component when a robust surface-mount Zener diode is needed for high-voltage regulation up to 200 V. Consider the 21 °C/W thermal resistance for heat dissipation calculations relative to the end cap. Verify that the ±5% tolerance meets circuit requirements, or specify tighter tolerances via part nomenclature if necessary.

Part Context

This device belongs to the 1N6309US through 1N6355DUS series of 0.5 W glass Zener diodes. It serves as the surface-mount B-SQ MELF package equivalent to the traditional axial-leaded DO-35 packages. The series covers a wide voltage range from 2.4 V to 200 V, offering standardized options for various regulatory needs.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation.

FAQ

What is the thermal resistance from junction to end cap for the 1N6355US?

The thermal resistance from junction to end cap is 21 °C/W for DC operation.

Is the 1N6355US sensitive to electrostatic discharge?

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