LZ52C15WS Equivalent & Substitute Parts

Part Overview

The LZ52C15WS is a Zener diode manufactured by Diodes Incorporated, rated at 15 V nominal with 500 mW maximum power dissipation in a 1206 surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -65°C to 175°C and maintains ±2% voltage tolerance with ROHS3 compliance.

Substiute Parts

LZ52C15WS

Diodes IncorporatedIn Stock: 1142LZ52C15WS Datasheet

Current PartRFQ

BZT52C15S-7-F

Diodes IncorporatedIn Stock: 155371BZT52C15S-7-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LZ52C15WS is determined by the following critical parameters:

Primary Matching Criteria:

• Zener voltage: 15 V nominal
• Mounting type: Surface mount
• RoHS3 compliance
• Operating temperature range compatibility

Secondary Considerations:

• Power dissipation capacity
• Voltage tolerance
• Package form factor
• Product status (active vs. obsolete)

The BZT52C15S-7-F qualifies as a functional substitute based on matching the 15 V zener voltage specification and surface mount configuration. However, this substitute operates at reduced maximum power (200 mW versus 500 mW) and exhibits wider voltage tolerance (±6% versus ±2%), with a lower maximum operating temperature (150°C versus 175°C). The package form differs from the original 1206, utilizing SOD-323 instead.

Parameter Comparison

Engineering Selection Recommendations

The BZT52C15S-7-F is an active product with established supply availability (155,300 pcs in stock), providing procurement continuity for the obsolete LZ52C15WS. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements.

Selection of the BZT52C15S-7-F requires circuit-level evaluation of the following deviations:

Power Dissipation: The substitute operates at 200 mW maximum versus 500 mW for the original. Applications requiring sustained power dissipation above 200 mW cannot use this substitute without thermal management modifications.

Voltage Tolerance: The ±6% tolerance of the substitute is wider than the ±2% specification of the original. Circuits with tight voltage regulation requirements may experience performance degradation.

Operating Temperature: The maximum junction temperature of 150°C for the substitute is 25°C lower than the original specification. High-temperature applications operating above 150°C require alternative solutions.

Package Transition: The SOD-323 package of the substitute differs from the 1206 form factor, necessitating PCB layout modifications and potential assembly process changes.

Frequently Asked Questions (FAQ)

Q: Can the BZT52C15S-7-F directly replace the LZ52C15WS without circuit modifications?

A: Direct replacement is not recommended without circuit evaluation. The substitute exhibits reduced power capacity (200 mW vs. 500 mW), wider tolerance (±6% vs. ±2%), and lower maximum temperature rating (150°C vs. 175°C). PCB layout changes are required due to package differences (SOD-323 vs. 1206).

Q: What is the primary limitation of using BZT52C15S-7-F as a substitute?

A: The maximum power dissipation of 200 mW is the primary constraint. Applications dissipating more than 200 mW in the zener diode require alternative components or circuit redesign to reduce power requirements.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the LZ52C15WS and BZT52C15S-7-F are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: How does the voltage tolerance difference affect circuit performance?

A: The BZT52C15S-7-F tolerance of ±6% produces a zener voltage range of 14.1 V to 15.9 V, compared to 14.7 V to 15.3 V for the original ±2% specification. Circuits sensitive to voltage regulation precision may require additional filtering or regulation stages.

Q: What package considerations apply to this substitution?

A: The original LZ52C15WS uses a 1206 package (3216 metric), while the BZT52C15S-7-F uses SOD-323. These packages have different footprints, requiring PCB redesign and potential changes to assembly processes and handling equipment.

Q: Is the BZT52C15S-7-F suitable for high-temperature applications?

A: The BZT52C15S-7-F operates to a maximum junction temperature of 150°C, which is 25°C lower than the original LZ52C15WS specification of 175°C. Applications requiring operation above 150°C require alternative components.