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Product Detailed Parameters
- Description：DIODE ZENER 39V 500MW SQ-MELF
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR),Cut Tape (CT)
- Voltage - Zener (Nom) (Vz)：39 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：55 Ohms
- Current - Reverse Leakage @ Vr：50 nA @ 30 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 1N6338US/TR is a surface-mount Zener voltage regulator diode housed in a B-SQ MELF package. It provides a nominal Zener voltage of 39V with a standard tolerance of ±5%. The device operates at a test current (IZ) of 3.2mA and exhibits a dynamic impedance (ZZ) of 55 ohms at this point. Maximum DC power dissipation is rated at 0.5W, with a maximum Zener current (IZM) of 30mA. The component supports a junction temperature range from -65°C to +175°C.
Feature Summary
- Hermetically sealed voidless glass construction utilizing internal metallurgical bonds for high reliability.
- Surface mount equivalent of the JEDEC registered 1N6309 through 1N6355 series.
- Inherently radiation hard and non-sensitive to electrostatic discharge per MIL-STD-750 method 1020.
Applications
- High-reliability applications where failure cannot be tolerated
- Voltage regulation over broad operating current and temperature ranges
- Military qualified electronic systems
Procurement Notes
Verify that the specific ordering suffix matches the required reliability level and RoHS compliance status. Confirm the package type corresponds to the B-SQ MELF form factor. Ensure the voltage tolerance aligns with design requirements, as tighter tolerances utilize different nomenclature. Check for any product change notifications or obsolescence notices prior to finalizing procurement plans.
Selection Notes
Select this component when a hermetically sealed surface-mount Zener diode is required for robust performance. The 1N6338US offers a 39V breakdown suitable for mid-range voltage regulation tasks. Consider the thermal resistance characteristics and derating curves if operating near maximum power limits. Verify compatibility with existing assembly processes for MELF packages.
Part Context
This part belongs to the 1N6309US through 1N6355DUS series of 0.5-watt Zener voltage regulators. The series is available in various reliability levels including JAN, JANTX, JANTXV, and JANS, all qualified per MIL-PRF-19500/533. The US designation indicates the surface-mount MELF package variant, distinct from the axial-leaded DO-35 versions.
Replacement Considerations
Direct replacements within the same family include other 1N63xxUS variants with different voltage ratings. Cross-reference the specific reliability level (JAN, JANTX, etc.) and RoHS compliance when substituting. Ensure the replacement maintains the B-SQ MELF package dimensions and hermetic sealing requirements.
