FLZ39VC Equivalent & Substitute Parts

Part Overview

The FLZ39VC is a Zener diode manufactured by onsemi, rated at 36.9 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 part operates across a temperature range of -65°C to 175°C and features ±3% voltage tolerance with REACH compliance.

Substiute Parts

FLZ39VC

onsemiIn Stock: 1032FLZ39VC Datasheet

Current PartRFQ

BZV55-C39,115

NXP SemiconductorsIn Stock: 838039BZV55-C39,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FLZ39VC is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage rating within acceptable circuit tolerance
• Power dissipation capacity of 500 mW minimum
• Surface mount package compatibility (SOD-80 / MINI-MELF / DO-213AC)
• Operating temperature range encompassing -65°C to 175°C
• Reverse leakage current characteristics suitable for application requirements
• Forward voltage characteristics compatible with circuit operation

The BZV55-C39,115 from NXP Semiconductors meets these substitution criteria through equivalent power rating, compatible package geometry, and overlapping operational specifications. Both components are surface mount Zener diodes in MINI-MELF packaging with 500 mW power ratings and operate within overlapping temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

The BZV55-C39,115 serves as a functional substitute for the obsolete FLZ39VC based on the following factors:

Product Status: The FLZ39VC is classified as obsolete, while the BZV55-C39,115 maintains active product status with established supply chain availability (837,966 units in stock versus 950 units for the original part).

Compliance and Certifications: Both components carry REACH Unaffected status, ensuring regulatory compliance across applicable markets. Both maintain MSL 1 (Unlimited) moisture sensitivity ratings.

Electrical Compatibility: The zener voltage differential of 2.1 V (36.9 V to 39 V) represents a 5.7% variance. The BZV55-C39,115 exhibits tighter tolerance control at ±5% compared to the FLZ39VC at ±3%, resulting in comparable voltage regulation performance within typical circuit applications.

Thermal Performance: The BZV55-C39,115 extends the upper operating temperature limit to 200°C, exceeding the FLZ39VC specification of 175°C, providing enhanced thermal margin.

Package Compatibility: Both components utilize identical surface mount packaging (DO-213AC, MINI-MELF, SOD-80), ensuring direct mechanical and electrical compatibility on existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-C39,115 directly replace the FLZ39VC in existing designs?

A: Direct replacement is possible when the 2.1 V zener voltage difference (36.9 V to 39 V) falls within circuit tolerance specifications. Verify that the application can accommodate the ±5% tolerance of the substitute versus the ±3% of the original part. Both components share identical package geometry and power ratings.

Q: What are the key differences between these two Zener diodes?

A: Primary differences include nominal zener voltage (36.9 V versus 39 V), voltage tolerance (±3% versus ±5%), impedance (72 Ohms versus 130 Ohms), and maximum operating temperature (175°C versus 200°C). Both maintain 500 mW power dissipation and surface mount SOD-80 packaging.

Q: Are there any thermal considerations when substituting these parts?

A: The BZV55-C39,115 supports operation to 200°C, providing 25°C additional thermal headroom compared to the FLZ39VC. This extended range does not introduce thermal incompatibility; however, circuit design should account for the impedance difference of 58 Ohms when calculating voltage regulation characteristics.

Q: How does the impedance difference affect circuit performance?

A: The BZV55-C39,115 exhibits 130 Ohms maximum impedance versus 72 Ohms for the FLZ39VC. This 58 Ohm difference affects dynamic impedance characteristics and voltage regulation under load transients. Applications requiring precise voltage regulation should evaluate this parameter against specific circuit requirements.

Q: Is the reverse leakage current difference significant?

A: The BZV55-C39,115 demonstrates lower reverse leakage (50 nA @ 27.3 V) compared to the FLZ39VC (133 nA @ 30 V). This represents improved leakage performance and may provide benefits in low-power or high-impedance circuit applications.

Q: What is the impact of the forward voltage difference?

A: The BZV55-C39,115 specifies 900 mV @ 10 mA forward voltage, while the FLZ39VC specifies 1.2 V @ 200 mA. These measurements occur at different current levels, making direct comparison inappropriate. Forward voltage characteristics apply to forward-biased operation, which is not the primary operating mode for Zener diodes in voltage regulation applications.

Q: Are both parts REACH compliant?

A: Both the FLZ39VC and BZV55-C39,115 carry REACH Unaffected status, confirming compliance with EU chemical regulations. Both maintain MSL 1 (Unlimited) moisture sensitivity ratings, requiring no special handling or storage conditions.