BZX284-C33,115 Equivalent & Substitute Parts

Part Overview

The BZX284-C33,115 is a Zener diode rated at 33 V nominal voltage with 400 mW maximum power dissipation in a SOD-110 surface mount package. 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 necessary for ongoing design support and production continuity.

Substiute Parts

BZX284-C33,115

NXP USA Inc.In Stock: 786BZX284-C33,115 Datasheet

Current PartRFQ

BZX384-B33,115

Nexperia USA Inc.In Stock: 54291BZX384-B33,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZX284-C33,115 is determined by the following critical parameters:

Electrical Compatibility:

• Zener voltage must be 33 V nominal
• Operating temperature range must encompass -65°C ~ 150°C
• Reverse leakage current specification must be 50 nA @ 23.1 V or lower
• Forward voltage drop must not exceed 1.1 V @ 100 mA

Mechanical & Packaging Compatibility:

• Surface mount mounting type required
• Package footprint must be compatible with circuit board layout

Regulatory & Compliance:

• RoHS3 compliance required
• MSL rating of 1 (Unlimited) required

The BZX384-B33,115 meets all electrical and regulatory requirements for substitution. However, the package transition from SOD-110 to SOD-323 and the reduction in maximum power rating from 400 mW to 300 mW represent design considerations that must be evaluated within the specific application context.

Parameter Comparison

Engineering Selection Recommendations

The BZX384-B33,115 is an active product manufactured by Nexperia USA Inc., providing long-term availability and supply chain stability compared to the obsolete BZX284-C33,115. Both components maintain identical zener voltage, operating temperature range, reverse leakage current, and forward voltage characteristics, ensuring functional equivalence in regulation performance.

The BZX384-B33,115 offers improved voltage tolerance (±2% versus ±5%), which provides tighter regulation accuracy. Both components are ROHS3 compliant and carry MSL rating 1 (Unlimited), meeting regulatory and moisture handling requirements.

The transition from SOD-110 to SOD-323 packaging and the reduction in maximum power dissipation from 400 mW to 300 mW require circuit-level evaluation. Applications operating at or near the 400 mW power limit of the original part must confirm that the 300 mW rating of the substitute is adequate for the intended duty cycle and thermal environment.

Frequently Asked Questions (FAQ)

Q: Can the BZX384-B33,115 directly replace the BZX284-C33,115 in all applications?

A: Electrical substitution is valid for applications where the maximum power dissipation does not exceed 300 mW. The SOD-323 package is physically smaller than SOD-110, requiring PCB layout modification. Footprint compatibility must be confirmed before implementation.

Q: What is the significance of the tolerance change from ±5% to ±2%?

A: The BZX384-B33,115 provides tighter zener voltage tolerance, resulting in more precise regulation around the 33 V nominal value. This is a functional improvement that does not prevent substitution but may enhance circuit performance.

Q: Are there any compliance or regulatory differences between these parts?

A: Both components are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings. No regulatory barriers to substitution exist.

Q: What is the impact of the impedance difference (40 Ohms versus 80 Ohms)?

A: The higher impedance of the BZX384-B33,115 affects transient response characteristics. Applications requiring specific impedance performance must evaluate this parameter within their circuit design.

Q: How does the package change from SOD-110 to SOD-323 affect implementation?

A: SOD-323 is a smaller package requiring different PCB footprint and land pattern design. Component placement and thermal management may differ. PCB redesign is necessary for physical substitution.

Q: Is the 300 mW power rating of the substitute sufficient for my application?

A: This determination requires analysis of the actual power dissipation in your circuit. If the original design operated below 300 mW, the substitute is adequate. If operation approached or exceeded 300 mW, thermal and power budget reassessment is required.