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1N5521B
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Product Detailed Parameters
- Description：DIODE ZENER 4.3V 500MW DO204AH
- 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
- Mounting Type：Through Hole
- Package / Case：DO-204AH, DO-35, Axial
- Voltage - Forward (Vf) (Max) @ If：1.1 V @ 200 mA
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N5521B 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 the 1N5518 through 1N5546 series, offering a maximum steady-state power dissipation of 0.5 W in a hermetically sealed axial-lead glass DO-35 package. The B suffix guarantees a voltage tolerance of plus or minus 5%. Key electrical limits include a maximum reverse leakage current of 3 µA at 1 V and a maximum dynamic impedance of 18 Ohms.
Feature Summary
- Hermetically sealed glass construction for environmental protection
- Guaranteed voltage regulation across specified operating currents
- Minimal capacitance characteristics suitable for high-frequency applications
- Inherently radiation hard design
Applications
- Voltage regulation over broad operating temperature ranges
- Reference voltage sources requiring stable breakdown characteristics
- Protection circuits utilizing avalanche breakdown properties
Procurement Notes
Verify that the specific order includes the required metallurgical bond option if military qualification levels such as JAN, JANTX, or JANTXV are necessary. Confirm RoHS compliance status, as it applies only to commercial grade versions. Ensure the selected part number matches the desired voltage tolerance and lead finish specifications before finalizing procurement.
Selection Notes
Select this component when a precise 4.3 V reference is needed with tight voltage tolerances. The DO-35 package supports flexible axial-lead mounting. Consider the internal metallurgical bond requirement if radiation hardness or specific military reliability standards must be met. Verify thermal derating requirements against the expected ambient operating conditions.
Part Context
This device belongs to the 1N5518 through 1N5546 series of low voltage avalanche Zener diodes manufactured by Microsemi (now Microchip Technology). The series provides voltage selections from 3.3 to 33 volts. The 1N5521B specifically targets the 4.3 V range with enhanced manufacturing controls indicated by the B suffix.
Replacement Considerations
Equivalent parts within the same series include 1N5520B and 1N5522B. Cross-referencing requires matching the nominal voltage, power rating, and package type.
