FLZ20VB Zener Diode Equivalent & Substitute Parts

Part Overview

The FLZ20VB is a 19.1 V, 500 mW Zener diode manufactured by onsemi in a surface mount SOD-80 package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The FLZ20VB serves as a voltage regulation and protection element in electronic circuits requiring precise Zener voltage characteristics at moderate power dissipation levels.

Substiute Parts

FLZ20VB

onsemiIn Stock: 1459FLZ20VB Datasheet

Current PartRFQ

BZV55-C20,115

Nexperia USA Inc.In Stock: 4365BZV55-C20,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FLZ20VB is determined by the following critical parameters:

Zener Voltage Compatibility: The substitute part must operate within the voltage regulation range required by the circuit. The FLZ20VB nominal Zener voltage is 19.1 V with ±3% tolerance, establishing a functional range of 18.5 V to 19.7 V.

Power Dissipation Rating: The substitute must support the same 500 mW maximum power rating to ensure thermal performance equivalence in the application.

Package and Mounting: Both the main part and substitute must use surface mount technology in compatible package formats (SOD-80, DO-213AC, MINI-MELF).

Operating Temperature Range: The substitute must cover the operating temperature envelope of -65°C to 175°C minimum.

Electrical Characteristics: Forward voltage, reverse leakage current, and impedance parameters must remain within acceptable circuit design tolerances.

The BZV55-C20,115 meets these substitution criteria with a nominal Zener voltage of 20 V (within acceptable circuit tolerance margins), identical 500 mW power rating, compatible surface mount packaging, and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The FLZ20VB is obsolete, necessitating transition to active production alternatives. The BZV55-C20,115 is actively manufactured by Nexperia USA Inc., ensuring long-term availability and supply chain continuity.

Compliance and Certifications: Both parts maintain identical REACH compliance status (REACH Unaffected) and export classification (EAR99). The BZV55-C20,115 carries RoHS3 compliance certification, providing additional regulatory alignment for modern applications.

Electrical Performance: The BZV55-C20,115 operates within acceptable substitution parameters. The 0.9 V nominal voltage difference (19.1 V to 20 V) falls within typical circuit design tolerances for Zener regulation applications. The identical 500 mW power rating ensures thermal equivalence.

Temperature Performance: The BZV55-C20,115 extends the upper operating temperature limit to 200°C, providing enhanced thermal margin compared to the FLZ20VB specification of 175°C.

Package Compatibility: Both components utilize identical surface mount packaging (SOD-80, DO-213AC, MINI-MELF), enabling direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-C20,115 directly replace the FLZ20VB in existing designs?

A: Yes, the BZV55-C20,115 is a direct substitute for the obsolete FLZ20VB. Both components share identical surface mount packaging (SOD-80), power rating (500 mW), and operating temperature range minimum (-65°C). The 0.9 V nominal voltage difference (19.1 V to 20 V) is within standard circuit design tolerances for Zener diode applications.

Q: What is the significance of the impedance difference between these parts?

A: The BZV55-C20,115 exhibits higher impedance (55 Ohms) compared to the FLZ20VB (23.5 Ohms). This parameter affects voltage regulation stability under load transients. Circuit designs must verify that the higher impedance remains acceptable for the specific application's dynamic response requirements.

Q: Does the wider tolerance of the BZV55-C20,115 (±5% vs ±3%) affect circuit performance?

A: The BZV55-C20,115 tolerance of ±5% is wider than the FLZ20VB specification of ±3%. Applications requiring tighter voltage regulation must evaluate whether the expanded tolerance band remains within acceptable circuit operating margins. The nominal voltage difference of 0.9 V must also be considered in this assessment.

Q: Are there any packaging considerations for substitution?

A: Both the FLZ20VB and BZV55-C20,115 utilize compatible surface mount packages (SOD-80, DO-213AC, MINI-MELF). The BZV55-C20,115 is supplied in Cut Tape (CT) and Digi-Reel packaging formats. No board layout or footprint modifications are required for substitution.

Q: What is the moisture sensitivity level for both components?

A: Both the FLZ20VB and BZV55-C20,115 carry Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no moisture-related storage or handling restrictions. Standard component storage practices apply to both parts.

Q: How does the extended temperature range of the BZV55-C20,115 benefit the application?

A: The BZV55-C20,115 supports operating temperatures up to 200°C, compared to the FLZ20VB maximum of 175°C. This 25°C additional thermal margin provides enhanced reliability in high-temperature environments and reduces thermal stress on the component during peak operating conditions.

Q: Are both components compliant with current regulatory standards?

A: Yes, both the FLZ20VB and BZV55-C20,115 maintain REACH compliance (REACH Unaffected) and identical export classification (EAR99). The BZV55-C20,115 additionally carries RoHS3 compliance certification, aligning with current environmental and regulatory requirements for electronic components.