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

Part Overview

The PDZ4.3B-QF 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 part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. The PDZ4.3B-QF meets automotive-grade specifications with AEC-Q101 qualification and ROHS3 compliance.

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)
Package / Case	SC-76, SOD-323	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

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

Parametric Equivalents (Identical Zener Voltage): Parts maintaining the 4.3 V nominal Zener voltage with ±2% tolerance, 400 mW power rating, 90 Ohms maximum impedance, and SOD-323 surface mount packaging are classified as parametric equivalents. These parts satisfy direct functional replacement requirements.

Voltage-Variant Substitutes (Different Zener Voltage): Parts with alternative Zener voltage ratings (such as 2.7 V) are classified as voltage-variant substitutes. These parts share identical power dissipation, package form factor, and mounting technology but operate at different voltage regulation points.

Compliance Basis: All substitute parts maintain automotive-grade classification, AEC-Q101 qualification, ROHS3 compliance, and SOD-323 packaging to ensure mechanical and electrical compatibility within the same application context.

Parameter Comparison

Parameter	PDZ4.3B-QF (Main)	PDZ4.3B-QX	PDZ4.3B,115	PDZ4.3B,135	PDZ2.7B-QX
Voltage - Zener (Nom)	4.3 V	4.3 V	4.3 V	4.3 V	2.7 V
Tolerance	±2%	±2%	±2%	±2%	±2%
Power - Max	400 mW	400 mW	400 mW	400 mW	400 mW
Impedance (Max)	90 Ohms	90 Ohms	90 Ohms	90 Ohms	100 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 1 V	3 µA @ 1 V	3 µA @ 1 V	3 µA @ 1 V	20 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	1.1 V @ 100 mA	1.1 V @ 100 mA	1.1 V @ 100 mA	1.1 V @ 100 mA
Operating Temperature	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)
Package / Case	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323
Grade	Automotive	Automotive	—	—	Automotive
Qualification	AEC-Q101	AEC-Q101	—	—	AEC-Q101
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalent Selection: The PDZ4.3B-QX, PDZ4.3B,115, and PDZ4.3B,135 are direct parametric equivalents to the PDZ4.3B-QF. All three maintain identical Zener voltage (4.3 V), power rating (400 mW), impedance (90 Ohms), and SOD-323 packaging. The PDZ4.3B-QX and PDZ4.3B,115 retain active product status with full automotive-grade and AEC-Q101 qualification. The PDZ4.3B,135 is also active with identical electrical specifications. These parts are suitable for direct replacement in applications requiring 4.3 V regulation.

Automotive-Grade Compliance: For applications requiring automotive-grade components with AEC-Q101 qualification, the PDZ4.3B-QX is the recommended parametric equivalent, as it maintains both certifications and active product status. The PDZ4.3B,115 and PDZ4.3B,135 are active alternatives with identical electrical performance but without explicitly stated automotive-grade designation in the provided data.

Voltage-Variant Consideration: The PDZ2.7B-QX operates at 2.7 V nominal Zener voltage and is suitable only for applications requiring lower voltage regulation. This part shares identical power dissipation (400 mW), SOD-323 packaging, automotive-grade classification, and AEC-Q101 qualification. The PDZ2.7B-QX exhibits higher reverse leakage current (20 µA @ 1 V versus 3 µA @ 1 V) and marginally higher impedance (100 Ohms versus 90 Ohms), which may affect circuit performance in precision voltage regulation applications.

Frequently Asked Questions (FAQ)

Q: Can the PDZ4.3B-QX directly replace the PDZ4.3B-QF?

A: Yes. The PDZ4.3B-QX is a parametric equivalent with identical Zener voltage (4.3 V), power rating (400 mW), impedance (90 Ohms), and SOD-323 package. Both parts maintain automotive-grade classification and AEC-Q101 qualification. The PDZ4.3B-QX is active, whereas the PDZ4.3B-QF is obsolete.

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

A: Both parts are parametric equivalents with identical electrical specifications: 4.3 V Zener voltage, 400 mW power rating, 90 Ohms impedance, and SOD-323 packaging. The designations ,115 and ,135 indicate different packaging configurations (Tape & Reel). Both are active products suitable for direct replacement.

Q: Can the PDZ2.7B-QX replace the PDZ4.3B-QF?

A: The PDZ2.7B-QX is not a direct replacement. It operates at 2.7 V nominal Zener voltage instead of 4.3 V. This part is suitable only for applications requiring 2.7 V voltage regulation. The PDZ2.7B-QX exhibits higher reverse leakage current (20 µA @ 1 V) compared to the main part (3 µA @ 1 V).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (PDZ4.3B-QX, PDZ4.3B,115, PDZ4.3B,135, and PDZ2.7B-QX) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: Which substitute part has the highest inventory availability?

A: The PDZ4.3B,115 has the highest inventory with 15,385 pieces in stock, followed by PDZ4.3B,135 with 10,982 pieces. The PDZ4.3B-QX has 801 pieces available.

Q: Do all substitute parts maintain the same operating temperature range?

A: Yes. All substitute parts operate at a maximum junction temperature (TJ) of 150°C, identical to the PDZ4.3B-QF.

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