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Product Detailed Parameters
- Description：DIODE ZENER 20V 500MW SQ-MELF
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：20 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：18 Ohms
- Current - Reverse Leakage @ Vr：50 nA @ 15 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
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N6331US is a surface-mount Zener voltage regulator with a nominal breakdown voltage of 20.0 V and a maximum dynamic impedance of 18 ohms at the test current of 6.2 mA. It operates within a junction temperature range of -65 °C to +175 °C and dissipates up to 0.5 W. The device features a voidless hermetically sealed glass package with internal metallurgical bonds, ensuring robust construction for high-reliability applications.
Feature Summary
- Hermetically sealed voidless hard glass package with tungsten slugs
- Internal Category III metallurgical bond for enhanced reliability
- Qualified per MIL-PRF-19500/533 for JAN, JANTX, JANTXV, and JANS levels
- Non-sensitive to electrostatic discharge (ESD) per MIL-STD-750 method 1020
Applications
- High-reliability military and aerospace circuits
- Voltage regulation in harsh environments
- Radiation-hardened electronic systems
Procurement Notes
Verify the specific reliability level required, as the base part number covers commercial through JANS grades. Confirm RoHS compliance status if applicable, noting that compliant versions are available only on commercial grade. Ensure the ordering suffix matches the desired tolerance and packaging configuration before finalizing procurement.
Selection Notes
Select this component when a 20 V reference is needed in a surface-mount Melf package. Consider the thermal resistance values for derating calculations based on end-cap or ambient conditions. Verify that the operating current falls within the specified range to maintain the required voltage regulation performance.
Part Context
This device belongs to the 1N6309US through 1N6355DUS series of 0.5 W glass Zener diodes. The series provides a wide selection of voltages from 2.4 V to 200 V with standard 5% tolerances and tighter options. It serves as the surface-mount equivalent to the JEDEC registered axial-leaded 1N63xx series.
Replacement Considerations
Direct replacements include other manufacturers' 1N6331 variants meeting MIL-PRF-19500/533 specifications. Surface-mount equivalents must match the B-SQ Melf package dimensions and electrical characteristics.
