PDZ3.9B-QZ Zener Diode Equivalent & Substitute Parts

Part Overview

The PDZ3.9B-QZ is a 3.9 V Zener diode manufactured by Nexperia USA Inc., rated for 400 mW power dissipation in a surface mount SOD-323 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant, making it suitable for automotive and industrial applications requiring reliable voltage regulation.

Substiute Parts

PDZ3.9B-QZ

Nexperia USA Inc.In Stock: 734PDZ3.9B-QZ Datasheet

Current PartRFQ

PDZ4.3B-QX

Nexperia USA Inc.In Stock: 901PDZ4.3B-QX Datasheet

MFR RecommendedRFQ

PDZ3.9B,115

Nexperia USA Inc.In Stock: 2235PDZ3.9B,115 Datasheet

Parametric EquivalentRFQ

PDZ3.9B-QX

Nexperia USA Inc.In Stock: 1012PDZ3.9B-QX Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PDZ3.9B-QZ is determined by the following critical parameters:

Zener Voltage (Vz): The nominal Zener voltage must match the circuit requirement. The PDZ3.9B-QZ operates at 3.9 V with ±2% tolerance.

Power Rating: All substitute parts must support the same 400 mW maximum power dissipation to ensure thermal compatibility and reliability.

Package and Mounting: All substitutes use the SOD-323 surface mount package (SC-76), ensuring mechanical and electrical compatibility with existing PCB layouts.

Electrical Characteristics: Impedance, reverse leakage current, and forward voltage specifications must remain consistent across substitutes to maintain circuit performance.

Compliance and Qualification: Automotive-grade classification and AEC-Q101 qualification are preserved across all active substitutes, maintaining suitability for regulated applications.

Substitute parts are grouped into two categories:

Parametric Equivalents (Same Zener Voltage): PDZ3.9B,115 and PDZ3.9B-QX maintain identical 3.9 V Zener voltage, differing only in packaging format and product status.

Functional Substitute (Different Zener Voltage): PDZ4.3B-QX operates at 4.3 V and is suitable only when circuit design permits a higher Zener voltage reference.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

PDZ3.9B-QX is the primary recommended substitute. This part maintains all electrical specifications of the PDZ3.9B-QZ, including 3.9 V Zener voltage, 400 mW power rating, and automotive-grade AEC-Q101 qualification. The part is active and available in Tape & Reel packaging, suitable for production environments. The PDZ3.9B-QX is functionally identical to the obsolete PDZ3.9B-QZ.

PDZ3.9B,115 is an alternative parametric equivalent offering identical electrical characteristics. This part is supplied in Cut Tape and Digi-Reel packaging formats and carries active product status. Selection between PDZ3.9B-QX and PDZ3.9B,115 depends on packaging requirements and procurement logistics.

For Circuit Design Flexibility:

PDZ4.3B-QX operates at 4.3 V Zener voltage and is suitable only when circuit design permits a 0.4 V increase in the reference voltage. This part maintains all other electrical specifications and carries automotive-grade AEC-Q101 qualification. Use of PDZ4.3B-QX requires circuit validation to confirm compatibility with the higher Zener voltage.

All recommended substitutes maintain ROHS3 compliance and automotive-grade qualification, ensuring regulatory and reliability requirements are met.

Frequently Asked Questions (FAQ)

Q: Can PDZ3.9B,115 be used as a direct replacement for PDZ3.9B-QZ?

A: Yes. PDZ3.9B,115 is a parametric equivalent with identical Zener voltage (3.9 V), power rating (400 mW), impedance (90 Ohms), and all other electrical specifications. The primary difference is packaging format (Cut Tape & Digi-Reel versus the original format) and active product status. Both parts are ROHS3 compliant and suitable for the same applications.

Q: What is the difference between PDZ3.9B-QX and PDZ3.9B,115?

A: Both parts are parametric equivalents with identical electrical specifications. The differences are packaging format and supplier device package designation. PDZ3.9B-QX is supplied in Tape & Reel format, while PDZ3.9B,115 is supplied in Cut Tape and Digi-Reel format. Selection depends on procurement volume and assembly process requirements.

Q: Can PDZ4.3B-QX replace PDZ3.9B-QZ in any application?

A: PDZ4.3B-QX has a higher Zener voltage (4.3 V versus 3.9 V). This part is a functional substitute only when circuit design permits a 0.4 V increase in the reference voltage. All other electrical parameters (power rating, impedance, leakage current, forward voltage) are identical. Circuit validation is required before substitution.

Q: Are all substitute parts automotive-grade?

A: PDZ3.9B-QX and PDZ4.3B-QX are automotive-grade with AEC-Q101 qualification. PDZ3.9B,115 does not list automotive grade or AEC-Q101 qualification in the provided specifications. For applications requiring automotive qualification, PDZ3.9B-QX is the recommended substitute.

Q: Do all substitute parts use the same SOD-323 package?

A: Yes. All substitute parts (PDZ3.9B,115, PDZ3.9B-QX, and PDZ4.3B-QX) use the SC-76 SOD-323 surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts designed for PDZ3.9B-QZ.

Q: What is the difference between the main part PDZ3.9B-QZ and the substitute PDZ3.9B-QX?

A: The PDZ3.9B-QZ is obsolete, while PDZ3.9B-QX is active. All electrical specifications are identical. The primary difference is product status and availability. PDZ3.9B-QX is the recommended substitute for ongoing procurement and new designs.

Q: Are all parts ROHS3 compliant?

A: Yes. All parts listed (PDZ3.9B-QZ, PDZ3.9B,115, PDZ3.9B-QX, and PDZ4.3B-QX) are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements.