BZX79C43 Equivalent & Substitute Parts

Part Overview

The BZX79C43 is a through-hole zener diode rated at 43 V nominal with 500 mW maximum power dissipation, manufactured by onsemi in the DO-35 axial package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage regulation, power handling, and thermal operating ranges while accommodating available packaging and supplier configurations.

Substiute Parts

BZX79C43

onsemiIn Stock: 25260BZX79C43 Datasheet

Current PartRFQ

BZX79-C43,113

NXP SemiconductorsIn Stock: 215950BZX79-C43,113 Datasheet

DirectRFQ

BZX79-C43,133

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

DirectRFQ

BZX79-C43,143

Nexperia USA Inc.In Stock: 740BZX79-C43,143 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZX79C43 is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Zener voltage (Nom): 43 V ±5% tolerance
• Package / Case: DO-204AH, DO-35, Axial (through-hole axial configuration)
• Operating temperature range: -65°C to 200°C minimum
• Impedance (Max): 150 Ohms
• Mounting type: Through Hole

Secondary Compatibility Factors:

• Power dissipation rating (substitute parts rated at 400 mW are acceptable for applications not requiring the full 500 mW specification)
• Reverse leakage current specifications within acceptable operational limits
• Forward voltage characteristics compatible with circuit design parameters

All identified substitute parts maintain the 43 V zener voltage specification and ±5% tolerance, operate across the full -65°C to 200°C temperature range, and are packaged in DO-35 axial through-hole configuration. Substitute parts are manufactured by NXP Semiconductors and Nexperia USA Inc., with active product status and full compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

BZX79-C43,113 (NXP Semiconductors)

This substitute is suitable for applications where the 400 mW power rating is sufficient. The part maintains full electrical equivalence at the 43 V zener voltage specification and operates across the complete -65°C to 200°C temperature range. Product status is active with unrestricted availability. Supplied in bulk packaging.

BZX79-C43,133 (Nexperia USA Inc.)

This substitute provides 43 V zener regulation with 400 mW power dissipation in cut tape packaging. The part is RoHS3 compliant and maintains active product status. Suitable for production environments requiring tape-and-reel component handling. Reverse leakage specification is 55 µA @ 700 mV.

BZX79-C43,143 (Nexperia USA Inc.)

This substitute is packaged in tape and box configuration and is RoHS3 compliant. The part delivers 43 V zener voltage with 400 mW power rating and maintains active product status. Reverse leakage specification is 50 nA @ 700 mV, matching the original BZX79C43 leakage characteristic. Lowest inventory availability among active substitutes.

All three substitute parts are manufactured by established semiconductor suppliers with active product status, ensuring long-term availability and supply chain continuity. Selection between substitutes is determined by packaging requirements (bulk, cut tape, or tape and box) and application power dissipation limits.

Frequently Asked Questions (FAQ)

Q: Can BZX79-C43,113, BZX79-C43,133, and BZX79-C43,143 be used interchangeably with BZX79C43?

A: Yes, all three substitute parts maintain the 43 V zener voltage specification, ±5% tolerance, and DO-35 axial through-hole package configuration. Electrical substitution is valid across the full -65°C to 200°C operating temperature range. Selection between substitutes depends on packaging format (bulk, cut tape, or tape and box) and application power dissipation requirements.

Q: What is the impact of the reduced power rating (400 mW vs. 500 mW) on substitution?

A: The substitute parts are rated at 400 mW maximum power dissipation compared to the original 500 mW specification. Applications requiring continuous power dissipation below 400 mW are fully compatible. Applications designed for the full 500 mW capability require thermal analysis to confirm the 400 mW rating is adequate for the specific circuit implementation.

Q: Are the substitute parts RoHS compliant?

A: BZX79-C43,133 and BZX79-C43,143 are RoHS3 compliant. BZX79-C43,113 compliance status is not specified in the provided data. All parts maintain REACH unaffected status and are classified under ECCN EAR99.

Q: What are the packaging differences between the three substitute options?

A: BZX79-C43,113 is supplied in bulk packaging. BZX79-C43,133 is supplied in cut tape (CT) format. BZX79-C43,143 is supplied in tape and box (TB) format. All three maintain identical electrical specifications and DO-35 axial package configuration.

Q: How do the reverse leakage characteristics compare?

A: BZX79C43 specifies 50 nA @ 30.1 V. BZX79-C43,113 and BZX79-C43,143 specify 50 nA @ 700 mV. BZX79-C43,133 specifies 55 µA @ 700 mV, representing a higher leakage specification. Applications sensitive to reverse leakage current should prioritize BZX79-C43,113 or BZX79-C43,143.

Q: What is the moisture sensitivity level for all parts?

A: All parts, including the original BZX79C43 and all three substitutes, are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.