PDZ3.3B-QZ Zener Diode Equivalent & Substitute Parts

Part Overview

The PDZ3.3B-QZ is a 3.3 V Zener diode manufactured by Nexperia USA Inc., rated for 400 mW maximum power dissipation in a surface mount SOD-323 package. This part carries an Obsolete product status, necessitating identification of active equivalent and substitute components for ongoing design support and procurement continuity. The PDZ3.3B-QZ is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±2%	—
Power - Max	400	mW
Impedance (Max)	95	Ohms
Current - Reverse Leakage @ Vr	5	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 obsolete PDZ3.3B-QZ is determined by the following critical parameters:

Parametric Equivalents maintain identical electrical specifications: Zener voltage of 3.3 V at ±2% tolerance, maximum power rating of 400 mW, impedance of 95 Ohms, reverse leakage current of 5 µA @ 1 V, and forward voltage of 1.1 V @ 100 mA. These parts are functionally interchangeable within the same circuit application.

Functional Substitutes operate at different Zener voltage ratings (2.7 V) while maintaining the same power rating, impedance characteristics, and package form factor. These substitutes are applicable only when circuit design permits voltage variation or when the lower voltage rating is acceptable for the intended application.

All substitute parts maintain:

Surface mount SOD-323 package compatibility
Automotive grade qualification (AEC-Q101)
ROHS3 compliance and REACH unaffected status
Moisture sensitivity level 1 (unlimited shelf life)

Parameter Comparison

Parameter	PDZ3.3B-QZ (Main)	PDZ3.3B,115 (Parametric Equivalent)	PDZ3.3B-QX (Parametric Equivalent)	PDZ2.7B-QX (Functional Substitute)
Voltage - Zener (Nom)	3.3 V	3.3 V	3.3 V	2.7 V
Tolerance	±2%	±2%	±2%	±2%
Power - Max	400 mW	400 mW	400 mW	400 mW
Impedance (Max)	95 Ohms	95 Ohms	95 Ohms	100 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 1 V	5 µA @ 1 V	5 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
Operating Temperature	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
Product Status	Obsolete	Active	Active	Active
Grade	Automotive	—	Automotive	Automotive
Qualification	AEC-Q101	—	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

PDZ3.3B,115 and PDZ3.3B-QX are parametric equivalents of the obsolete PDZ3.3B-QZ. Both maintain identical Zener voltage, power rating, impedance, and leakage characteristics. Selection between these two equivalents depends on packaging requirements: PDZ3.3B,115 is supplied in Cut Tape and Digi-Reel format, while PDZ3.3B-QX is supplied in Tape & Reel format. Both are active products with full AEC-Q101 automotive qualification and ROHS3 compliance.

For Functional Substitution (Voltage Variant):

PDZ2.7B-QX operates at 2.7 V nominal Zener voltage and is applicable only when circuit design accommodates the lower voltage rating. This part maintains the same 400 mW power rating, SOD-323 package form factor, and automotive qualification. The reverse leakage current is higher at 20 µA @ 1 V compared to 5 µA @ 1 V for the 3.3 V variants, and impedance is 100 Ohms versus 95 Ohms. Use this substitute only when voltage specification permits deviation from the original 3.3 V requirement.

All substitute parts are active products with current manufacturing status and established supply chains.

Frequently Asked Questions (FAQ)

Q: Can PDZ3.3B,115 be used as a direct replacement for PDZ3.3B-QZ?

A: Yes. PDZ3.3B,115 is a parametric equivalent with identical electrical specifications: 3.3 V Zener voltage, 400 mW power rating, 95 Ohms impedance, and 5 µA reverse leakage current. Both are housed in SOD-323 packages and maintain AEC-Q101 automotive qualification. The primary difference is packaging format: PDZ3.3B,115 is supplied in Cut Tape and Digi-Reel, while PDZ3.3B-QZ was supplied in standard packaging.

Q: What is the difference between PDZ3.3B-QX and PDZ3.3B,115?

A: Both are parametric equivalents with identical electrical performance. The distinction is packaging: PDZ3.3B-QX is supplied in Tape & Reel format, while PDZ3.3B,115 is supplied in Cut Tape and Digi-Reel format. Selection depends on procurement and assembly requirements. Both are active products with full automotive qualification.

Q: Can PDZ2.7B-QX replace PDZ3.3B-QZ in all applications?

A: PDZ2.7B-QX is a functional substitute only when circuit design permits operation at 2.7 V instead of 3.3 V. The lower Zener voltage will result in different voltage regulation characteristics. Additionally, reverse leakage current is higher (20 µA @ 1 V versus 5 µA @ 1 V) and impedance is slightly higher (100 Ohms versus 95 Ohms). Use this substitute only when voltage specification allows deviation from the original 3.3 V requirement.

Q: Are all substitute parts automotive qualified?

A: PDZ3.3B-QX and PDZ2.7B-QX carry AEC-Q101 automotive qualification. PDZ3.3B,115 does not list automotive grade or AEC-Q101 qualification in the provided specifications. For automotive applications requiring AEC-Q101 compliance, use PDZ3.3B-QX or PDZ2.7B-QX.

Q: What is the inventory status of these substitute parts?

A: PDZ3.3B,115 has 55,797 pieces in stock. PDZ3.3B-QX has 656 pieces in stock. PDZ2.7B-QX has 944 pieces in stock. All are active products with established supply availability.

Q: Are all parts ROHS3 compliant?

A: Yes. PDZ3.3B-QZ, PDZ3.3B,115, PDZ3.3B-QX, and PDZ2.7B-QX are all ROHS3 compliant with moisture sensitivity level 1 (unlimited shelf life) and REACH unaffected status.

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