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1N5521BUR-1
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Product Detailed Parameters
- Description：DIODE ZENER 4.3V 500MW DO213AA
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：4.3 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：18 Ohms
- Current - Reverse Leakage @ Vr：3 µA @ 1.5 V
- Operating Temperature：-65°C ~ 175°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：DO-213AA
- Voltage - Forward (Vf) (Max) @ If：1.1 V @ 200 mA
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N5521BUR-1 is a low voltage avalanche Zener diode with a nominal breakdown voltage of 4.3 V at a test current of 20 mA. It operates within a steady-state power dissipation rating of 0.5 W and features a maximum Zener impedance of 18 Ohms. The device exhibits a maximum reverse leakage current of 3.0 µA and maintains a voltage tolerance of ±5%. It is housed in a hermetically sealed DO-213AA MELF package, supporting an operating temperature range from -65°C to +175°C.
Feature Summary
- Hermetically sealed glass surface mount construction
- Internal metallurgical bond for enhanced reliability
- Qualified per MIL-PRF-19500/437 standards
- Inherently radiation hard
Applications
- Satellite communications (satcom) terminals
- Aerospace and defense systems
- Military electronic circuits requiring high reliability
Procurement Notes
Verify the specific revision level of the datasheet T4-LDS-0037 Rev 2 when sourcing components. Confirm that the B suffix corresponds to the required ±5% voltage tolerance. Ensure the UR-1 designation matches the surface mount MELF package requirement. Check for RoHS compliance status if environmental regulations apply to the final assembly.
Selection Notes
Select this component for applications requiring precise voltage regulation in harsh environments. The 0.5 W power rating supports moderate current loads. The wide temperature range ensures stability across extreme conditions. Verify thermal resistance requirements against the derating curve for high ambient temperatures.
Part Context
This part belongs to the 1N5518BUR-1 through 1N5546BUR-1 series of low voltage avalanche Zener diodes. The series offers a broad selection of voltages from 3.3 V to 33 V. All devices share the same DO-213AA MELF package and metallurgical bond construction. They are designed to meet stringent military qualification levels.
Replacement Considerations
Compatible replacements include other parts qualified under MIL-PRF-19500/437 with matching MELF packages. Verify equivalent electrical parameters such as Zener voltage, impedance, and power dissipation before substitution.
