PDZ4.3B-QZ Zener Diode Equivalent & Substitute Parts

Part Overview

The PDZ4.3B-QZ is a 4.3 V Zener diode rated for 400 mW maximum power dissipation in a surface mount SOD-323 package. Manufactured by Nexperia USA Inc., this component is classified as obsolete. The PDZ4.3B-QZ is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements. Due to its obsolete status, equivalent and substitute parts with active product status are available to support ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.3	V
Tolerance	±2%	—
Power - Max	400	mW
Impedance (Max)	90	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 100 mA
Operating Temperature	150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the PDZ4.3B-QZ is determined by the following critical parameters:

Zener Voltage (Vz): The nominal zener voltage must match at 4.3 V to maintain circuit regulation specifications.

Power Rating: The maximum power dissipation must equal or exceed 400 mW to support the thermal requirements of the application.

Impedance (Zzt): The maximum impedance of 90 Ohms defines the dynamic resistance characteristics during zener operation.

Reverse Leakage Current: The reverse leakage current of 3 µA @ 1 V establishes the leakage performance baseline.

Forward Voltage: The forward voltage drop of 1.1 V @ 100 mA defines the forward conduction characteristics.

Package and Mounting: The SOD-323 surface mount package is required for physical and electrical compatibility with existing PCB layouts.

Compliance and Qualification: AEC-Q101 automotive qualification and ROHS3 compliance are mandatory for applications requiring these certifications.

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts with identical electrical specifications (4.3 V zener voltage, 400 mW power rating, 90 Ohms impedance) and active product status.

Functional Alternatives: Parts with different zener voltage ratings that serve alternative circuit requirements but do not directly replace the PDZ4.3B-QZ in existing designs.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Leakage @ 1V (µA)	Vf @ 100mA (V)	Package	Status	AEC-Q101
PDZ4.3B-QZ	Nexperia USA Inc.	4.3	±2%	400	90	3	1.1	SOD-323	Obsolete	Yes
PDZ4.3B-QX	Nexperia USA Inc.	4.3	±2%	400	90	3	1.1	SOD-323	Active	Yes
PDZ4.3B,115	Nexperia USA Inc.	4.3	±2%	400	90	3	1.1	SOD-323	Active	No
PDZ4.3B,135	Nexperia USA Inc.	4.3	±2%	400	90	3	1.1	SOD-323	Active	No
PDZ2.4B-QX	Nexperia USA Inc.	2.4	±2%	400	100	50	1.1	SOD-323	Active	Yes

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

The PDZ4.3B-QX is the direct replacement for the obsolete PDZ4.3B-QZ. Both parts maintain identical electrical specifications (4.3 V zener voltage, 400 mW power rating, 90 Ohms impedance) and both carry AEC-Q101 automotive qualification. The PDZ4.3B-QX has active product status and is available in Tape & Reel packaging. This part is the primary selection for designs requiring automotive-grade zener diodes with maintained compliance certifications.

For Non-Automotive Applications:

The PDZ4.3B,115 and PDZ4.3B,135 are parametric equivalents with identical electrical performance to the PDZ4.3B-QZ. Both parts have active product status and are supplied in Tape & Reel packaging. These parts do not carry AEC-Q101 qualification and are suitable for applications where automotive certification is not required. Selection between PDZ4.3B,115 and PDZ4.3B,135 is based on packaging and supply chain considerations, as electrical specifications are identical.

For Alternative Voltage Requirements:

The PDZ2.4B-QX is a functional alternative with a 2.4 V zener voltage rating. This part is not a direct replacement for the PDZ4.3B-QZ but serves applications requiring lower voltage regulation. The PDZ2.4B-QX maintains AEC-Q101 qualification and 400 mW power rating. Selection of this part requires circuit redesign to accommodate the different zener voltage.

Frequently Asked Questions (FAQ)

Q: Can PDZ4.3B,115 or PDZ4.3B,135 be used in automotive applications requiring AEC-Q101 qualification?

A: No. The PDZ4.3B,115 and PDZ4.3B,135 do not carry AEC-Q101 qualification. For automotive applications with AEC-Q101 requirements, the PDZ4.3B-QX is the appropriate selection.

Q: What is the difference between PDZ4.3B-QX, PDZ4.3B,115, and PDZ4.3B,135?

A: All three parts have identical electrical specifications: 4.3 V zener voltage, 400 mW power rating, 90 Ohms impedance, and SOD-323 packaging. The PDZ4.3B-QX carries AEC-Q101 automotive qualification; the PDZ4.3B,115 and PDZ4.3B,135 do not. Differences relate to qualification level and internal packaging designations.

Q: Is the PDZ2.4B-QX a direct substitute for the PDZ4.3B-QZ?

A: No. The PDZ2.4B-QX has a 2.4 V zener voltage, which differs from the 4.3 V rating of the PDZ4.3B-QZ. This part is a functional alternative for applications requiring lower voltage regulation and cannot be used as a direct replacement without circuit modification.

Q: What packaging formats are available for the substitute parts?

A: All substitute parts are supplied in Tape & Reel (TR) packaging in the SOD-323 surface mount package format. This packaging is compatible with automated assembly processes and standard PCB layouts designed for SOD-323 components.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (PDZ4.3B-QX, PDZ4.3B,115, PDZ4.3B,135, and PDZ2.4B-QX) are ROHS3 compliant and REACH unaffected.

Q: What is the moisture sensitivity level (MSL) for these zener diodes?

A: All parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

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