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Product Detailed Parameters
- Description：DIODE ZENER 27V 500MW SQ-MELF
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：27 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：27 Ohms
- Current - Reverse Leakage @ Vr：50 nA @ 21 V
- Operating Temperature：-65°C ~ 175°C
- 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 1N6334US is a military-qualified Zener voltage regulator featuring a voidless hermetically sealed glass package. It provides a nominal Zener voltage of 27V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and dissipates up to 0.5W at an end cap temperature of 150°C. It utilizes a B-SQ MELF surface mount package.
Feature Summary
- Hermetically sealed voidless hard glass construction with tungsten slugs
- Internal metallurgical bonding for enhanced reliability
- Qualified per MIL-PRF-19500/533 standards
- Inherently radiation hard
Applications
- High-reliability applications where failure cannot be tolerated
- Voltage regulation over broad operating current and temperature ranges
- Military and aerospace electronic systems
Procurement Notes
Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these levels are available separately. Confirm RoHS compliance status if applicable, noting that compliant versions are commercial grade only. Ensure the ordering suffix matches the desired voltage tolerance and packaging configuration.
Selection Notes
Select this component when a robust, hermetically sealed surface mount Zener diode is needed for critical environments. Consider the thermal resistance values (junction-to-end cap and junction-to-ambient) for power derating calculations. Verify that the 27V breakdown voltage aligns with circuit requirements and check the dynamic impedance specifications for noise-sensitive designs.
Part Context
This part belongs to the 1N6309US through 1N6355DUS series of 0.5-watt Zener voltage regulators. The series offers extensive voltage selections from 2.4V to 200V in both surface mount MELF and axial leaded DO-35 packages. It serves as the surface mount equivalent to the JEDEC registered 1N6309 through 1N6355 series.
Replacement Considerations
Direct replacements include other parts within the 1N6309US thru 1N6355DUS series with matching voltage ratings. Cross-reference with JAN, JANTX, JANTXV, or JANS qualified variants depending on reliability needs. Commercial equivalents may lack hermetic sealing.
