FLZ24VC Equivalent & Substitute Parts

Part Overview

The FLZ24VC is a Zener diode manufactured by onsemi, rated at 23.8 V nominal with 500 mW power dissipation in a surface mount SOD-80 package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified voltage, power, and thermal operating ranges while accommodating packaging and tolerance variations.

Substiute Parts

FLZ24VC

onsemiIn Stock: 1077FLZ24VC Datasheet

Current PartRFQ

BZV55-B24,115

Nexperia USA Inc.In Stock: 28007BZV55-B24,115 Datasheet

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BZV55-C24,135

NXP SemiconductorsIn Stock: 220948BZV55-C24,135 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FLZ24VC is determined by the following critical parameters:

Voltage Compatibility: Nominal Zener voltage must fall within the application tolerance band. The FLZ24VC operates at 23.8 V ±3%, establishing an acceptable range of 23.066 V to 24.534 V. Substitute parts rated at 24 V with stated tolerances of ±2% to ±5% remain within acceptable deviation limits for most circuit applications.

Power Dissipation: Maximum power rating must equal or exceed 500 mW to ensure thermal stability under worst-case operating conditions.

Package Compatibility: All substitute parts must utilize the same surface mount package family (DO-213AC, MINI-MELF, SOD-80) to ensure mechanical and electrical compatibility with existing PCB layouts.

Operating Temperature Range: Substitute parts must support the minimum operating temperature of -65°C. Extended upper temperature ratings (200°C vs. 175°C) provide additional design margin without creating incompatibility.

Electrical Characteristics: Impedance, reverse leakage current, and forward voltage parameters must be evaluated within the context of circuit design requirements, though these parameters exhibit acceptable variation across the substitute parts listed.

Parameter Comparison

Engineering Selection Recommendations

BZV55-B24,115 (Nexperia USA Inc.): This part is classified as active with ROHS3 compliance. The ±2% tolerance provides tighter voltage regulation compared to the FLZ24VC. The extended operating temperature range to 200°C offers improved thermal margin. Higher impedance (70 Ohms vs. 29 Ohms) and lower reverse leakage current (50 nA vs. 133 nA) represent measurable differences that may influence circuit performance in precision applications. Inventory availability is substantial at 27,900 units.

BZV55-C24,135 (NXP Semiconductors): This part is classified as active with the widest tolerance specification at ±5%. The extended operating temperature range to 200°C matches the Nexperia offering. Impedance and reverse leakage characteristics are identical to the BZV55-B24,115. Inventory availability is significantly higher at 220,894 units, supporting high-volume production requirements. The broader tolerance may be acceptable for applications with less stringent voltage regulation requirements.

Both substitute parts satisfy the mandatory substitution criteria: equivalent 500 mW power rating, compatible surface mount package, and operating temperature range extending to or beyond -65°C. Selection between these options depends on tolerance requirements and inventory availability for the specific application.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-B24,115 or BZV55-C24,135 be used as direct replacements for the FLZ24VC without circuit modification?

A: Both substitute parts are electrically compatible within the constraints of circuit design. The nominal voltage difference (23.8 V to 24 V) and tolerance variations fall within acceptable operating margins for most applications. No circuit modification is required from a package or thermal perspective, as all parts utilize identical surface mount packaging.

Q: What is the significance of the impedance difference between the FLZ24VC (29 Ohms) and the substitute parts (70 Ohms)?

A: Impedance affects voltage regulation under transient load conditions. The FLZ24VC exhibits lower impedance, providing superior transient response. Applications requiring precise voltage regulation under dynamic load conditions should evaluate this parameter against circuit specifications. Static voltage regulation applications typically tolerate the higher impedance of the substitute parts.

Q: How do the tolerance specifications affect part selection?

A: The FLZ24VC operates at ±3% tolerance. The BZV55-B24,115 provides ±2% tolerance, offering tighter voltage control. The BZV55-C24,135 operates at ±5% tolerance, providing broader acceptable voltage range. Circuit design specifications determine whether tighter or broader tolerance is acceptable. Precision voltage reference applications favor the ±2% option.

Q: Are there packaging considerations when substituting these parts?

A: All three parts utilize the same package family (DO-213AC, MINI-MELF, SOD-80). PCB footprints and assembly processes remain unchanged. Tape & Reel packaging for the BZV55-B24,115 and Bulk packaging for the BZV55-C24,135 represent supply format differences only and do not affect electrical or mechanical compatibility.

Q: What is the impact of the extended operating temperature range on the substitute parts?

A: Both substitute parts support operation to 200°C, compared to 175°C for the FLZ24VC. This extended range provides additional thermal margin and may improve reliability in high-temperature environments. Applications operating within the FLZ24VC temperature range experience no adverse effects from the extended capability.

Q: How do reverse leakage current specifications compare?

A: The FLZ24VC exhibits 133 nA reverse leakage at 19 V, while both substitute parts specify 50 nA at their respective measurement conditions. Lower reverse leakage reduces standby power consumption and improves circuit efficiency. This represents an improvement over the original part specification.

Q: Which substitute part should be selected for new designs?

A: Selection depends on specific application requirements. The BZV55-B24,115 is recommended for applications requiring tighter voltage tolerance (±2%) and lower impedance performance. The BZV55-C24,135 is suitable for applications with broader tolerance acceptance and offers superior inventory availability for high-volume production. Both parts are active products with established supply chains.