FLZ12VB Equivalent & Substitute Parts

Part Overview

The FLZ12VB is a Zener diode manufactured by onsemi, rated at 11.7 V nominal with 500 mW power dissipation in a surface mount SOD-80 package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. The obsolete status requires engineers to evaluate active alternative components that maintain functional compatibility within circuit applications.

Substiute Parts

FLZ12VB

onsemiIn Stock: 917FLZ12VB Datasheet

Current PartRFQ

TZM5242B-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 20432TZM5242B-GS08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FLZ12VB is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Zener voltage nominal rating within acceptable circuit tolerance
• Power dissipation rating equal to or greater than 500 mW
• Package type: SOD-80 (DO-213AC, MINI-MELF)
• Mounting type: Surface Mount
• Operating temperature range encompassing -65°C to 175°C

Regulatory & Availability Criteria:

• Active product status for ongoing procurement
• Compliance certifications (REACH, RoHS where applicable)
• Moisture sensitivity level 1 (Unlimited)

The TZM5242B-GS08 qualifies as a substitute based on matching power rating (500 mW), identical package type (SOD-80), surface mount configuration, and active product status. The nominal Zener voltage of 12 V represents a 0.3 V deviation from the FLZ12VB specification, which falls within typical circuit tolerance margins for voltage regulation applications.

Parameter Comparison

Engineering Selection Recommendations

The TZM5242B-GS08 serves as a direct substitute for the obsolete FLZ12VB based on the following engineering factors:

Product Status & Availability: The TZM5242B-GS08 maintains active product status with 20,400 units in stock, ensuring reliable procurement compared to the obsolete FLZ12VB with limited remaining inventory of 831 units.

Package & Mechanical Compatibility: Both components utilize identical SOD-80 (DO-213AC, MINI-MELF) surface mount packaging, enabling direct board-level substitution without PCB redesign or assembly process modification.

Electrical Performance: The 12 V nominal Zener voltage of the TZM5242B-GS08 represents a 2.6% deviation from the FLZ12VB specification. This variance is acceptable for voltage regulation and protection circuits where ±5% tolerance is standard. The identical 500 mW power rating ensures equivalent thermal performance and current handling capacity.

Regulatory Compliance: Both components carry REACH Unaffected status and moisture sensitivity level 1 (Unlimited), maintaining compliance with environmental and handling requirements. The TZM5242B-GS08 additionally carries RoHS3 compliance certification.

Parameter Trade-offs: The substitute exhibits higher impedance (30 Ohms vs. 9.5 Ohms) and reverse leakage current (1 µA vs. 133 nA), which may affect circuit performance in precision applications requiring minimal leakage or low dynamic impedance. Circuit validation is required for applications with stringent impedance or leakage specifications.

Frequently Asked Questions (FAQ)

Q: Can the TZM5242B-GS08 be used as a direct replacement for the FLZ12VB without circuit modification?

A: The TZM5242B-GS08 is mechanically and electrically compatible for most standard voltage regulation and protection applications. Both components share identical SOD-80 packaging and 500 mW power ratings. The 12 V nominal voltage represents a 0.3 V deviation from the FLZ12VB, which is within acceptable tolerance for typical circuit designs. However, applications requiring precise voltage regulation or minimal leakage current should evaluate the parameter differences before implementation.

Q: What are the key electrical differences between these components?

A: The primary electrical differences are: (1) Zener voltage tolerance widens from ±3% to ±5% in the substitute; (2) Impedance increases from 9.5 Ohms to 30 Ohms; (3) Reverse leakage current increases from 133 nA to 1 µA. These differences may impact circuit performance in precision applications or those with strict leakage specifications.

Q: Are both components available in the same packaging format?

A: Yes. Both the FLZ12VB and TZM5242B-GS08 are packaged in SOD-80 (DO-213AC, MINI-MELF) surface mount format, enabling direct PCB-level substitution without assembly process changes.

Q: What is the significance of the FLZ12VB being obsolete?

A: Obsolete status indicates that onsemi has discontinued manufacturing the FLZ12VB. Remaining inventory is limited to 831 units. For new designs or long-term production requirements, the active TZM5242B-GS08 from Vishay provides assured supply continuity and manufacturing support.

Q: How do the operating temperature ranges compare?

A: The FLZ12VB operates from -65°C to 175°C. The TZM5242B-GS08 specification provided indicates a maximum of 175°C. Both components support the upper temperature limit, though the substitute's lower temperature specification should be verified for applications requiring full -65°C to 175°C range coverage.

Q: Are there compliance or certification differences between these parts?

A: Both components are REACH Unaffected and carry moisture sensitivity level 1 (Unlimited). The TZM5242B-GS08 additionally carries RoHS3 compliance certification, providing enhanced environmental compliance for regulated markets.