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Product Detailed Parameters
- Description：DIODE ZENER 68V 500MW SQ-MELF
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：68 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：155 Ohms
- Current - Reverse Leakage @ Vr：50 nA @ 52 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 1N6344US is a surface-mount Zener voltage regulator housed in a B-SQ MELF package. It provides a nominal Zener voltage of 68 V with a standard tolerance of ±5%. The device operates at a test current of 1.8 mA and features a maximum dynamic impedance of 155 ohms. Rated for a steady-state power dissipation of 0.5 W, it supports an operating temperature range from -65°C to +175°C.
Feature Summary
- Hermetically sealed voidless glass construction with internal metallurgical bonds
- Military qualification per MIL-PRF-19500/533 standards
- Inherently radiation hard design
- Non-sensitive to electrostatic discharge
Applications
- High-reliability applications where failure cannot be tolerated
- Voltage regulation over broad operating current and temperature ranges
- Small surface mount Melf implementations
Procurement Notes
Verify the specific reliability level required, as commercial versions lack military qualification. Confirm RoHS compliance status if applicable, noting that compliant finishes are available on commercial grade only. Ensure the ordering suffix matches the desired voltage tolerance and packaging configuration before finalizing procurement.
Selection Notes
Select this component when a robust, hermetically sealed surface-mount Zener diode is required for high-reliability environments. The 1N6344US offers a 68 V breakdown suitable for precise regulation needs. Consider the thermal resistance characteristics and derating curves for proper heat management in dense PCB layouts.
Part Context
This part belongs to the 1N6309US through 1N6355DUS series of industry-recognized 0.5 watt Zener voltage regulators. The series includes selections from 2.4 to 200 volts with various tolerance options. It serves as the surface-mount equivalent to the JEDEC registered axial-leaded 1N6309 through 1N6355 series.
Replacement Considerations
Direct replacements include JAN1N6344US, JANTX1N6344US, and JANTXV1N6344US for higher reliability levels. Commercial equivalents may vary in qualification but share identical electrical specifications.
