PDZ33B/ZLX Zener Diode Equivalent & Substitute Parts

Part Overview

The PDZ33B/ZLX is a 32.97 V, 400 mW Zener diode manufactured by Nexperia USA Inc. in SOD-323 surface mount packaging. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. The PDZ33B/ZLX remains functionally available through parametric equivalents and similar alternatives that maintain electrical and mechanical compatibility within specified tolerances.

Substiute Parts

PDZ33B/ZLX

Nexperia USA Inc.In Stock: 713PDZ33B/ZLX Datasheet

Current PartRFQ

PDZ33BF

Nexperia USA Inc.In Stock: 11028PDZ33BF Datasheet

Parametric EquivalentRFQ

PDZ33BZ

Nexperia USA Inc.In Stock: 31051PDZ33BZ Datasheet

Parametric EquivalentRFQ

MM3Z33VST1G

onsemiIn Stock: 2182MM3Z33VST1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PDZ33B/ZLX is determined by alignment of the following critical electrical and mechanical parameters:

Parametric Equivalents (PDZ33BF, PDZ33BZ) maintain identical specifications across all electrical characteristics: 32.97 V nominal Zener voltage, ±2% tolerance, 400 mW maximum power dissipation, 40 Ohms maximum impedance, 50 nA reverse leakage current, and 1.1 V maximum forward voltage. Both parts are manufactured by Nexperia USA Inc., share the SOD-323 package, and are classified as active products. These parts differ only in packaging format (Tape & Reel) and product status (Active vs. Obsolete).

Similar Substitute (MM3Z33VST1G) manufactured by onsemi provides functional substitution with the following parameter deviations: nominal Zener voltage of 33 V (0.03 V variance from 32.97 V specification), reduced maximum power dissipation of 300 mW (100 mW reduction), increased impedance of 80 Ohms (40 Ohms increase), and forward voltage of 900 mV at 10 mA (different test condition). This part maintains SOD-323 packaging and ±2% tolerance. The MM3Z33VST1G is suitable for applications where the reduced power rating and increased impedance are acceptable within circuit design margins.

Parameter Comparison

Engineering Selection Recommendations

PDZ33BF and PDZ33BZ are direct parametric equivalents to the PDZ33B/ZLX and are the primary substitution choice. Both parts are manufactured by Nexperia USA Inc., maintain identical electrical specifications, and are classified as active products with full availability. Selection between PDZ33BF and PDZ33BZ depends on packaging requirements: PDZ33BF is supplied in Tape & Reel format with 11,004 units in stock, while PDZ33BZ is also supplied in Tape & Reel format with 30,993 units in stock. Both parts satisfy ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original PDZ33B/ZLX specification.

MM3Z33VST1G serves as a functional alternative for applications where the parameter deviations are acceptable. This onsemi part introduces three key differences: 33 V nominal Zener voltage (within ±2% tolerance band), 300 mW maximum power dissipation (25% reduction), and 80 Ohms impedance (100% increase). The MM3Z33VST1G is suitable for circuits with lower power dissipation requirements and where the increased impedance does not compromise voltage regulation performance. This part is active and ROHS3 compliant with 2,139 units in stock.

Frequently Asked Questions (FAQ)

Q: Can PDZ33BF or PDZ33BZ be used as direct replacements for PDZ33B/ZLX?

A: Yes. PDZ33BF and PDZ33BZ are parametric equivalents with identical electrical specifications: 32.97 V nominal Zener voltage, ±2% tolerance, 400 mW power rating, 40 Ohms impedance, and matching forward voltage characteristics. Both are manufactured by Nexperia USA Inc., use SOD-323 packaging, and are active products. The only differences are packaging format (Tape & Reel) and inventory availability.

Q: What are the limitations of using MM3Z33VST1G as a substitute?

A: The MM3Z33VST1G introduces three parameter deviations: nominal Zener voltage of 33 V (0.03 V higher), maximum power dissipation of 300 mW (100 mW lower), and impedance of 80 Ohms (40 Ohms higher). These differences are acceptable in applications where circuit design margins accommodate reduced power handling and increased dynamic impedance. Verification of circuit performance under these conditions is necessary before implementation.

Q: Are all substitute parts compatible with the original SOD-323 footprint?

A: Yes. PDZ33BF, PDZ33BZ, and MM3Z33VST1G all use SC-76, SOD-323 packaging, ensuring mechanical and footprint compatibility with designs specified for PDZ33B/ZLX.

Q: Do the substitute parts meet the same compliance standards as PDZ33B/ZLX?

A: Yes. PDZ33BF, PDZ33BZ, and MM3Z33VST1G are all ROHS3 compliant and REACH unaffected, matching the regulatory status of PDZ33B/ZLX. All parts carry Moisture Sensitivity Level 1 (Unlimited).

Q: Which substitute part should be selected for new designs?

A: PDZ33BF or PDZ33BZ are recommended for new designs due to identical electrical specifications and active product status. Selection between these two depends on packaging and inventory requirements. MM3Z33VST1G is suitable only when the reduced power rating and increased impedance align with circuit design specifications.

Q: What is the difference between PDZ33BF and PDZ33BZ?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The primary difference is inventory availability: PDZ33BZ has 30,993 units in stock compared to PDZ33BF with 11,004 units. Both are supplied in Tape & Reel packaging.