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Product Detailed Parameters
- Description：DIODE ZENER 3.3V 1.5W SQ-MELF
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Voltage - Zener (Nom) (Vz)：3.3 V
- Tolerance：±5%
- Power - Max：1.5 W
- Impedance (Max) (Zzt)：10 Ohms
- Current - Reverse Leakage @ Vr：50 µA @ 1 V
- Operating Temperature：-65°C ~ 175°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：SQ-MELF, A
- Voltage - Forward (Vf) (Max) @ If：1.5 V @ 1 A
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N6485US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 3.3 V and a maximum power dissipation of 1.5 W at 25°C ambient temperature. It operates within a junction and storage temperature range of -65°C to +175°C. The device features a test current (IZT) of 76.0 mA, a maximum dynamic impedance (ZZT) of 10 Ohms, and a maximum reverse leakage current of 50 µA at the specified voltage. It utilizes a voidless hermetically sealed glass MELF package.
Feature Summary
- Military qualified to MIL-PRF-19500/406 standards for high-reliability applications.
- Hermetically sealed void-less glass construction with internal metallurgical bonds.
- Triple-layer passivation provides robust protection against environmental stressors.
Applications
- Voltage regulation in aerospace systems requiring extreme reliability.
- Circuit protection in military-grade electronic equipment.
- Power supply reference stages in harsh environment instrumentation.
Procurement Notes
Verify the specific qualification level required for your application, as this series offers JAN, JANTX, JANTXV, and JANS options. Confirm that the RoHS compliance status aligns with your manufacturing constraints, noting that compliant versions are available only on commercial grades. Ensure the ordering suffix matches the desired tolerance and packaging configuration before finalizing procurement.
Selection Notes
Select this component when a 3.3 V reference is needed in a surface mount form factor with high thermal stability. Consider the 1.5 W power rating and the wide operating temperature range up to 175°C for demanding environments. Verify that the 10 Ohm dynamic impedance meets the noise and regulation requirements of the target circuit design.
Part Context
This part belongs to the 1N6485US–1N6491US series of voidless hermetically sealed surface mount 1.5 Watt glass Zener diodes. These devices serve as the surface mount equivalent of popular JEDEC registered axial-lead series, providing a direct replacement option for legacy designs while offering improved mechanical robustness and space efficiency.
Replacement Considerations
Direct replacements include other parts from the 1N6485US–1N6491US series or the 1N4460US–1N4496US series if pinout compatibility is maintained. Verify that substitute components meet the same MIL-PRF-19500/406 qualification levels and possess identical package dimensions for proper board integration.
FAQ
What is the maximum continuous Zener current for the 1N6485US?
The maximum continuous regulator current (IZM) for the 1N6485US is 433 mA.
Is the 1N6485US radiation hard?
Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050.
