Equivalent & Substitute Parts for BZX284-C43,115

Part Overview

The BZX284-C43,115 is a Zener diode rated at 43 V nominal voltage with 400 mW maximum power dissipation in SOD-110 surface mount packaging. Manufactured by NXP USA Inc., this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, identifying equivalent substitute parts is essential for ongoing design support and production continuity.

Substiute Parts

BZX284-C43,115

NXP USA Inc.In Stock: 1049BZX284-C43,115 Datasheet

Current PartRFQ

BZX384-B43,115

Nexperia USA Inc.In Stock: 25833BZX384-B43,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZX284-C43,115 is determined by the following critical parameters:

• Zener Voltage (Vz): Must remain 43 V nominal to maintain circuit voltage regulation function
• Power Dissipation (Pmax): Substitute must support minimum 400 mW; lower ratings require circuit redesign
• Voltage Tolerance: Tighter tolerance (±2%) is acceptable; wider tolerance is not
• Reverse Leakage Current: Must not exceed 50 nA @ 30.1 V
• Forward Voltage: Must not exceed 1.1 V @ 100 mA
• Operating Temperature Range: Must span -65°C to 150°C minimum
• Surface Mount Configuration: Required for PCB compatibility
• Regulatory Compliance: RoHS3 and REACH compliance required

The BZX384-B43,115 qualifies as a direct substitute based on these parameters. Although it features reduced power rating (300 mW versus 400 mW) and different packaging (SOD-323 versus SOD-110), it maintains the critical electrical specifications and regulatory compliance necessary for functional equivalence in applications where the lower power rating is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration: Product Status

The BZX284-C43,115 is classified as obsolete. The BZX384-B43,115 is an active product with significantly higher inventory availability (25,820 pieces in stock versus 977 pieces). This availability differential supports long-term supply chain stability.

Regulatory Compliance

Both components maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements for current manufacturing standards.

Power Rating Differential

The substitute part features 300 mW maximum power dissipation compared to 400 mW in the original. Selection of the BZX384-B43,115 is appropriate for applications where thermal dissipation requirements do not exceed 300 mW. Applications requiring sustained operation at or near 400 mW dissipation require thermal analysis to confirm the substitute's adequacy or necessitate circuit redesign.

Package Transition

The transition from SOD-110 to SOD-323 packaging requires PCB layout modification. SOD-323 is a smaller package; footprint redesign is mandatory. Both packages are standard surface mount configurations with established manufacturing processes.

Impedance Specification

The substitute exhibits higher maximum impedance (150 Ohms versus 80 Ohms). This parameter affects transient response characteristics in voltage regulation circuits. Circuit simulation or empirical testing is appropriate to confirm performance equivalence in applications with stringent transient requirements.

Frequently Asked Questions (FAQ)

Q: Can the BZX384-B43,115 directly replace the BZX284-C43,115 without circuit modification?

A: Direct PCB replacement is not possible due to different package types (SOD-323 versus SOD-110). Footprint redesign is required. Electrical substitution is valid provided the application does not require sustained power dissipation exceeding 300 mW and can tolerate the higher impedance specification.

Q: What is the significance of the ±2% tolerance on the substitute versus ±5% on the original?

A: The substitute's tighter tolerance (±2%) provides improved voltage regulation accuracy. This is a beneficial characteristic that does not create compatibility issues. Circuits designed for ±5% tolerance will function correctly with ±2% components.

Q: Why does the substitute have higher impedance (150 Ohms versus 80 Ohms)?

A: Impedance is a frequency-dependent parameter affecting transient response. Higher impedance may result in slower transient settling in dynamic load conditions. Applications with stringent transient specifications should evaluate this parameter through circuit simulation or testing.

Q: Is the 100 mW power reduction (from 400 mW to 300 mW) significant?

A: Significance depends on application requirements. For continuous operation near maximum power ratings, the reduction is material and requires thermal analysis. For applications operating well below maximum ratings, the difference is negligible.

Q: Are there any supply chain advantages to using the BZX384-B43,115?

A: Yes. The substitute is an active product with substantially higher inventory availability (25,820 pieces versus 977 pieces). This supports long-term procurement reliability and reduces lead time risk.

Q: Do both components meet current environmental standards?

A: Yes. Both the BZX284-C43,115 and BZX384-B43,115 are ROHS3 compliant and REACH unaffected, satisfying current regulatory requirements for electronic component manufacturing and distribution.