PDZ16B/ZLX Equivalent & Substitute Parts

Part Overview

The PDZ16B/ZLX is a Zener diode manufactured by Nexperia USA Inc., rated at 16.18 V nominal with 400 mW power dissipation in a surface mount SOD-323 package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for standard industrial and commercial applications.

Substiute Parts

PDZ16B/ZLX

Nexperia USA Inc.In Stock: 1144PDZ16B/ZLX Datasheet

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MM3Z16VT1G

onsemiIn Stock: 89361MM3Z16VT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PDZ16B/ZLX is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage nominal rating within acceptable circuit tolerance
• Power dissipation capacity equal to or greater than 400 mW
• Impedance characteristics compatible with circuit regulation requirements
• SOD-323 surface mount package for PCB compatibility
• Reverse leakage current specifications suitable for application requirements

Secondary Compatibility Factors:

• Forward voltage characteristics for forward-biased operation
• Operating temperature range encompassing maximum junction temperature of 150°C
• RoHS3 compliance for regulatory alignment
• Moisture sensitivity level MSL 1 for standard handling and storage

The MM3Z16VT1G from onsemi qualifies as a functional substitute based on matching package geometry, surface mount configuration, and core zener diode specifications within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The PDZ16B/ZLX is classified as obsolete. The MM3Z16VT1G is classified as active, ensuring continued availability and manufacturing support for future production requirements.

Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications. Moisture sensitivity level MSL 1 is identical, requiring no changes to handling or storage protocols.

Electrical Performance Trade-offs: The MM3Z16VT1G substitute exhibits reduced maximum power dissipation (300 mW versus 400 mW) and increased impedance (40 Ohms versus 20 Ohms). Circuit designs operating at maximum power levels or requiring tight voltage regulation must evaluate whether these parameter differences remain within acceptable operating margins. The zener voltage nominal rating difference of 0.18 V falls within the ±2% tolerance specification of the original part.

Packaging and Assembly: Both components utilize identical SOD-323 surface mount packages, eliminating PCB redesign requirements and maintaining assembly process compatibility.

Frequently Asked Questions (FAQ)

Q: Can MM3Z16VT1G directly replace PDZ16B/ZLX in all applications?

A: Direct substitution is valid for applications where the 300 mW power rating and 40 Ohm impedance specifications remain within circuit design margins. Applications requiring the full 400 mW dissipation capacity or tighter voltage regulation (20 Ohm impedance) require circuit analysis to confirm compatibility.

Q: What is the significance of the ±2% versus ±6% tolerance difference?

A: The PDZ16B/ZLX maintains tighter voltage tolerance (±2%), while the MM3Z16VT1G allows wider tolerance (±6%). Circuits with strict voltage regulation requirements must account for this specification difference in design margin calculations.

Q: Are the packages physically identical?

A: Yes. Both parts use the SOD-323 package (SC-76 case designation). PCB footprints, land patterns, and assembly processes are identical, requiring no layout modifications.

Q: Does the impedance difference affect circuit performance?

A: Impedance affects voltage regulation characteristics and transient response. The MM3Z16VT1G impedance of 40 Ohms (versus 20 Ohms) results in reduced regulation performance. Circuits sensitive to load transients or requiring precise voltage stability require evaluation against specific application requirements.

Q: What is the impact of reduced power rating on thermal design?

A: The 100 mW reduction in maximum power dissipation (from 400 mW to 300 mW) requires verification that circuit operating conditions do not exceed the substitute part's thermal limits. Thermal analysis based on actual current and voltage conditions is necessary for high-power applications.

Q: Are there compliance or certification differences?

A: Both parts maintain identical RoHS3 compliance, REACH unaffected status, and MSL 1 moisture sensitivity ratings. No compliance-related restrictions apply to substitution.

Q: What is the operating temperature range difference?

A: The MM3Z16VT1G provides extended lower temperature operation (-65°C minimum versus unspecified minimum for PDZ16B/ZLX). Both parts support the 150°C maximum junction temperature requirement. Applications requiring sub-zero operation benefit from the extended range of the substitute part.