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Product Detailed Parameters
- Description：DIODE ZENER 18V 500MW SQ-MELF
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Voltage - Zener (Nom) (Vz)：18 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：14 Ohms
- Current - Reverse Leakage @ Vr：50 nA @ 14 V
- Operating Temperature：-65°C ~ 175°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：SQ-MELF, B
- Voltage - Forward (Vf) (Max) @ If：1.4 V @ 1 A
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Overview
The Microchip Technology 1N6330US/TR is a surface-mount Zener diode with an 18 V nominal voltage and ±5% tolerance. It operates in the B-SQ-MELF-2 package, dissipating up to 500 mW. Key electrical parameters include a maximum reverse leakage current of 50 nA, a Zener impedance of 14 Ohms at a test current of 7 mA, and a forward voltage of 1.4 V at 1 A. The device supports a wide operating temperature range from -65°C to +175°C.
Feature Summary
- Hermetically sealed voidless-glass construction for high reliability
- Internal metallurgical bond for enhanced structural integrity
- Surface-mount equivalent of the JEDEC registered 1N6309 series
Applications
- Military and aerospace circuits requiring high-reliability voltage regulation
- High-temperature electronic systems operating up to 175°C
- Critical applications where component failure cannot be tolerated
Procurement Notes
Verify that the specific suffix matches the required qualification level, as military-grade variants may differ from commercial equivalents. Confirm RoHS status, as this part is typically non-compliant. Ensure the B-SQ-MELF-2 package dimensions align with your PCB footprint requirements before finalizing procurement.
Selection Notes
Select this component when a hermetically sealed, surface-mount Zener diode is required for extreme environments. It serves as a direct surface-mount replacement for the axial 1N6330. Consider the 14 Ohm impedance and 500 mW power rating to ensure compatibility with your circuit's thermal and voltage regulation needs.
Part Context
This component belongs to the 1N6309 through 1N6355 series of 0.5 W glass Zener diodes. Manufactured by Microchip (formerly Microsemi), these devices are qualified per MIL-PRF-19500/533. The series provides industry-standard voltage selections in a compact, voidless hermetically sealed glass package suitable for demanding applications.
Replacement Considerations
The axial leaded 1N6330 is the primary JEDEC equivalent. For surface-mount replacements, verify that alternative B-SQ Melf packages maintain identical voltage tolerances and hermetic sealing standards.
