1N721 Zener Diode Equivalent & Substitute Parts Reference

Part Overview

The Microchip Technology 1N721 is a Zener diode characterized by a nominal Zener voltage of 20 V, 250 mW power rating, and ±10% tolerance, housed in a DO-35 (DO-204AH) axial package for through-hole mounting. The part’s RoHS status is non-compliant, and product status is active, but sourcing alternatives is sometimes necessary due to compliance demands, inventory management, or varying power requirements. Identifying substitute models is essential for maintaining operational compatibility when direct replacement or compliance mandates arise.

Substiute Parts

1N721

Microchip TechnologyIn Stock: 8821N721 Datasheet

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1N4747A,133

NXP USA Inc.In Stock: 502281N4747A,133 Datasheet

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BZX79-B20,113

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Key Parameters

Substitute Part Grouping Explanation

Substitute Zener diodes are selected strictly by matching primary electrical and mechanical parameters within the Diodes, Zener category. These include nominal Zener voltage, tolerance, power rating, impedance, mounting type, and package standards. Only parts preserving the through-hole configuration and axial package are considered. Additional regulatory and inventory data must align with specific application requirements as provided.

Key substitution parameters:

• Voltage - Zener (Nom) (Vz)
• Tolerance
• Power - Max
• Impedance (Max) (Zzt)
• Mounting Type
• Package / Case

Parameter Comparison

Engineering Selection Recommendations

For direct substitution of the Microchip Technology 1N721 Zener diode, only devices marked as active and available for through-hole mounting with similar or compatible package/case types are eligible. Product, RoHS, and REACH compliance must be matched with project requirements. Selection between substitutes may be guided by conformance to tolerance levels, power rating, and electrical parameters strictly as documented. All considered substitutes are listed as active components in the inventory.

Frequently Asked Questions (FAQ)

Q1: What is the primary electrical substitution criterion for the 1N721 Zener diode?
A1: Nominal Zener voltage (20 V) is the primary substitution criterion. Tolerance, power rating, and maximum impedance are also considered.

Q2: Are package and mounting types critical in substitution?
A2: Yes. Only axial, through-hole packages (DO-35 or DO-41) match the mechanical requirements for direct replacement in most applications.

Q3: How does tolerance affect substitute compatibility?
A3: Substitute Zener diodes must have a tolerance equal to or tighter than the original part’s ±10% for functional equivalency.

Q4: Must substitute diodes match the exact power rating?
A4: Substitute parts may have equal or greater power ratings. All listed substitutes meet or exceed the original 250 mW rating.

Q5: Is RoHS compliance relevant when selecting substitute Zener diodes?
A5: Yes. If application requirements mandate RoHS compliance, only substitute parts with matching compliance status should be considered.

Q6: Does the supplier device package need to match exactly?
A6: Compatibility depends on the form factor and mounting requirements. DO-35 and DO-41 are both industry-standard axial, through-hole packages suitable for direct replacement where mechanical fit aligns.

Q7: Is product status significant in choosing a substitute?
A7: Only parts marked as active are valid substitutes for continuity and future sourcing.