PDZ27B/ZLX Equivalent & Substitute Parts

Part Overview

The PDZ27B/ZLX is a Zener diode manufactured by Nexperia USA Inc., rated at 26.86 V nominal with 400 mW power dissipation in a surface mount SOD-323 package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications requiring stable voltage regulation in the 26.86 V range.

Substiute Parts

PDZ27B/ZLX

Nexperia USA Inc.In Stock: 1186PDZ27B/ZLX Datasheet

Current PartRFQ

PDZ27BZ

Nexperia USA Inc.In Stock: 8148PDZ27BZ Datasheet

Parametric EquivalentRFQ

MM3Z27VT1G

onsemiIn Stock: 17478MM3Z27VT1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PDZ27B/ZLX are classified based on electrical parameter compatibility within defined tolerances and mechanical package equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

• Zener voltage nominal rating within acceptable circuit tolerance
• Power dissipation capacity meeting or exceeding application requirements
• Impedance characteristics suitable for regulation stability
• Reverse leakage current specifications
• Forward voltage characteristics
• Surface mount SOD-323 package compatibility
• Operating temperature range coverage

Parametric Equivalent Classification: The PDZ27BZ represents a parametric equivalent, sharing identical electrical specifications with the main part while differing only in packaging format (Tape & Reel versus bulk). This part maintains the same manufacturer lineage and performance characteristics.

Similar Substitute Classification: The MM3Z27VT1G from onsemi represents a similar substitute with minor electrical deviations. While the nominal Zener voltage is 27 V (compared to 26.86 V), the tolerance specification of ±5% and reduced power rating of 300 mW require circuit-level evaluation for suitability in specific applications.

Parameter Comparison

Engineering Selection Recommendations

PDZ27BZ Selection: The PDZ27BZ is the primary recommended substitute for the obsolete PDZ27B/ZLX. This part maintains identical electrical specifications including 26.86 V nominal Zener voltage, ±2% tolerance, 400 mW power rating, and 40 Ohms maximum impedance. Both parts are manufactured by Nexperia USA Inc. and share the same base product number (PDZ27). The PDZ27BZ carries active product status with 8054 units in stock, ensuring supply continuity. Packaging differs only in format (Tape & Reel versus bulk), with no impact on electrical performance or circuit compatibility. ROHS3 compliance and unlimited moisture sensitivity rating are maintained.

MM3Z27VT1G Selection: The MM3Z27VT1G from onsemi serves as an alternative substitute when PDZ27BZ availability is constrained. This part operates at 27 V nominal Zener voltage with ±5% tolerance, representing a 0.52% deviation from the original 26.86 V specification. Power dissipation is reduced to 300 mW, and impedance increases to 80 Ohms. The extended operating temperature range (-65°C to 150°C) provides broader environmental coverage compared to the main part's 150°C maximum. This substitute is suitable for applications where the voltage tolerance band and reduced power rating align with circuit requirements. ROHS3 compliance and unlimited moisture sensitivity rating are maintained.

Frequently Asked Questions (FAQ)

Q: Can PDZ27BZ be used as a direct replacement for PDZ27B/ZLX?

A: Yes. The PDZ27BZ is a parametric equivalent with identical electrical specifications. The only difference is packaging format (Tape & Reel versus bulk). Both parts share the same manufacturer, base product number, and performance characteristics. No circuit modifications are required.

Q: What are the key differences between PDZ27BZ and MM3Z27VT1G?

A: The PDZ27BZ maintains the original 26.86 V nominal voltage with ±2% tolerance and 400 mW power rating. The MM3Z27VT1G operates at 27 V with ±5% tolerance and 300 mW power rating. Additionally, the MM3Z27VT1G has higher impedance (80 Ohms versus 40 Ohms) and an extended lower temperature limit (-65°C). These differences require circuit-level evaluation for compatibility.

Q: Is the SOD-323 package identical across all three parts?

A: Yes. All three parts use the SC-76, SOD-323 surface mount package. Physical footprint and PCB layout compatibility are maintained across PDZ27B/ZLX, PDZ27BZ, and MM3Z27VT1G.

Q: What does the ±2% tolerance on PDZ27B/ZLX and PDZ27BZ mean?

A: The ±2% tolerance indicates that the actual Zener voltage will fall within the range of 26.32 V to 27.40 V (26.86 V ± 2%). This tighter tolerance compared to the MM3Z27VT1G (±5%) provides more precise voltage regulation in applications requiring strict voltage control.

Q: Can MM3Z27VT1G replace PDZ27B/ZLX in all applications?

A: Not necessarily. The MM3Z27VT1G has reduced power dissipation (300 mW versus 400 mW), higher impedance (80 Ohms versus 40 Ohms), and wider voltage tolerance (±5% versus ±2%). Applications requiring the full 400 mW power capacity or tighter voltage regulation should use PDZ27BZ instead.

Q: Are all three parts RoHS compliant?

A: Yes. PDZ27B/ZLX, PDZ27BZ, and MM3Z27VT1G are all ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), suitable for standard industrial and commercial manufacturing processes.

Q: Why is PDZ27B/ZLX marked as obsolete?

A: The PDZ27B/ZLX is classified as obsolete, indicating discontinued production by Nexperia USA Inc. The PDZ27BZ serves as the active replacement with identical specifications and continued manufacturing support.