1N729 Zener Diode Equivalent & Substitute Parts Reference

Part Overview

The Microchip Technology 1N729 is a Zener diode specified for 43 V nominal Zener voltage, 250 mW maximum power dissipation, and ±10% tolerance, supplied in a DO-204AH (DO-35, Axial) package. The part is currently active and available in bulk packaging. Identifying equivalent or substitute Zener diode models is necessary for sourcing flexibility, ensuring continuous production, design interchangeability, and for RoHS compliance considerations.

Substiute Parts

1N729

Microchip TechnologyIn Stock: 8801N729 Datasheet

Current PartRFQ

BZX79-C43,133

Nexperia USA Inc.In Stock: 10909BZX79-C43,133 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute Zener diodes are grouped strictly based on the following allowed parameters: category, mounting type, package/case, nominal Zener voltage, maximum power, and tolerance. Only devices matching or exceeding these specifications in a compatible package/case and mounting type are included for substitution. Compliance statuses such as RoHS and product activity are also considered.

Key parameters for substitution:

• Category: Diodes, Zener
• Mounting Type: Through Hole
• Package / Case: DO-204AH, DO-35, Axial
• Voltage - Zener (Nom) (Vz): 43 V
• Power - Max: ≥ 250 mW
• Tolerance: ≤ ±10%

Parameter Comparison

Engineering Selection Recommendations

Select a substitute Zener diode based on matching package, mounting type, and key electrical specifications. If RoHS compliance or other environmental regulations are mandatory for the application, BZX79-C43,133 serves as a suitable alternative to 1N729, as it is ROHS3 Compliant and offered in the same package and mounting configuration.

Frequently Asked Questions (FAQ)

Q1: What are the primary parameters for selecting a Zener diode substitute?
A1: Match category, package/case, mounting type, Zener voltage, maximum power rating, and tolerance.

Q2: Is package or mounting style important for substitution?
A2: Yes, both must match to ensure mechanical and board-level compatibility.

Q3: Does a tighter tolerance substitution affect electrical performance?
A3: A tighter tolerance (such as ±5% replacing ±10%) reduces Zener voltage variation and conforms to original requirements.

Q4: What compliance factors should be considered?
A4: RoHS and REACH status must match application requirements. BZX79-C43,133 offers ROHS3 compliance, while 1N729 is RoHS non-compliant.

Q5: Can a higher power-rated Zener diode replace a lower power-rated version?
A5: Yes, provided all other parameters match, a higher power rating is acceptable within the same package type.

Q6: Is the impedance value critical for every application?
A6: Impedance should be reviewed if specified by the design, but primary substitution relies on matching Zener voltage, tolerance, power, package, and mounting type.