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1N5521BUR-1/TR
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Product Detailed Parameters
- Description：DIODE ZENER 4.3V 500MW DO213AA
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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/TR 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 junction temperature range of -65°C to +175°C and dissipates up to 0.5 W. The device features a maximum dynamic impedance of 18 Ohms and a reverse leakage current of 3 µA at 1.5 V. Packaged in a hermetically sealed DO-213AA MELF surface mount format, the TR suffix indicates tape and reel packaging.
Feature Summary
- Hermetically sealed glass MELF package construction
- Internal metallurgical bond for enhanced reliability
- Qualified per MIL-PRF-19500/437 standards
- Radiation hard design characteristics
Applications
- Voltage regulation over broad operating currents
- High-reliability military and aerospace circuits
- ESD protection applications
Procurement Notes
Verify that the specific ordering suffix matches the required tolerance level and packaging configuration. Confirm RoHS compliance status if applicable, as commercial versions may differ from qualified levels. Ensure the supplier provides documentation confirming the internal metallurgical bond construction and adherence to MIL-PRF-19500/437 specifications.
Selection Notes
Select this component when a stable 4.3 V reference is required in a compact surface mount form factor. The DO-213AA package suits automated assembly processes. Consider the thermal resistance values for power derating calculations at elevated ambient temperatures. Verify that the 18 Ohm impedance meets the noise and regulation requirements of the target circuit.
Part Context
This part belongs to the 1N5518BUR-1 through 1N5546BUR-1 series of 0.5 W glass surface mount Zener regulators. The series covers voltages from 3.3 V to 33 V. The 'B' suffix denotes a standard 5% voltage tolerance. The 'UR-1' designation identifies the surface mount MELF package with an internal metallurgical bond option.
Replacement Considerations
Consult the manufacturer's official substitution guide for verified equivalents. Generic replacements must match the DO-213AA footprint, 4.3 V nominal voltage, and 0.5 W power dissipation rating.
