FLZ6V2B Equivalent & Substitute Parts

Part Overview

The FLZ6V2B is a Zener diode manufactured by onsemi, rated at 6.1 V nominal with 500 mW power dissipation in a surface mount SOD-80 package. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance within acceptable tolerances while meeting the same mechanical and thermal requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.1	V
Tolerance	±3%	%
Power - Max	500	mW
Impedance (Max)	8.5	Ohms
Current - Reverse Leakage @ Vr	3.3	µA @ 3 V
Voltage - Forward (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the FLZ6V2B is determined by the following critical parameters:

Electrical Compatibility Criteria:

Zener voltage within ±5% of nominal 6.1 V specification
Power dissipation rating of 500 mW or greater
Operating temperature range encompassing -65°C to 175°C minimum
Surface mount package configuration (SOD-80 / DO-213AC / MINI-MELF)
Moisture sensitivity level of 1 (Unlimited) or equivalent

Mechanical Compatibility Criteria:

Identical or compatible package footprint (DO-213AC, MINI-MELF, SOD-80)
Surface mount technology compatibility

The BZV55-B6V2,115 meets these substitution criteria through equivalent power rating, compatible package geometry, and overlapping thermal operating range.

Parameter Comparison

Parameter	FLZ6V2B (onsemi)	BZV55-B6V2,115 (NXP)	Compatibility
Voltage - Zener (Nom)	6.1 V	6.2 V	Within ±5% tolerance band
Tolerance	±3%	±2%	Substitute tighter tolerance
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	8.5 Ohms	10 Ohms	Within acceptable range
Current - Reverse Leakage @ Vr	3.3 µA @ 3 V	3 µA @ 4 V	Comparable performance
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	900 mV @ 10 mA	Different test conditions
Operating Temperature Range	-65 to 175°C	-65 to 200°C	Substitute exceeds minimum requirement
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Substitute actively manufactured

Engineering Selection Recommendations

The BZV55-B6V2,115 from NXP Semiconductors is a direct functional equivalent for the obsolete FLZ6V2B. Selection is based on the following engineering factors:

Electrical Performance: The 6.2 V nominal zener voltage of the BZV55-B6V2,115 deviates 0.1 V (1.6%) from the FLZ6V2B specification, remaining within the ±5% substitution tolerance band. Both devices maintain identical 500 mW power ratings and surface mount configuration.

Compliance and Availability: The BZV55-B6V2,115 carries active product status with substantial inventory availability (313,222 units), ensuring procurement continuity. Both parts maintain REACH Unaffected status and EAR99 export classification.

Thermal Performance: The BZV55-B6V2,115 operating temperature range (-65°C to 200°C) exceeds the FLZ6V2B requirement (-65°C to 175°C), providing enhanced thermal margin.

Package Compatibility: Both devices utilize identical DO-213AC / MINI-MELF / SOD-80 package geometry, enabling direct PCB footprint compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-B6V2,115 be used as a direct replacement for the FLZ6V2B without circuit modification?

A: Yes. The 0.1 V difference in nominal zener voltage (6.2 V vs. 6.1 V) represents a 1.6% deviation, which falls within acceptable substitution tolerance for zener diode applications. Both devices share identical power ratings, package geometry, and surface mount configuration.

Q: What is the significance of the ±3% tolerance on the FLZ6V2B versus ±2% on the BZV55-B6V2,115?

A: The BZV55-B6V2,115 provides tighter voltage tolerance, resulting in more precise zener voltage regulation. This represents an improvement over the original specification and does not create compatibility issues.

Q: Are the package dimensions identical between FLZ6V2B and BZV55-B6V2,115?

A: Both devices utilize the DO-213AC / MINI-MELF / SOD-80 package standard, ensuring identical footprint and mechanical compatibility on PCB assemblies.

Q: What is the impact of the different reverse leakage current specifications?

A: The FLZ6V2B specifies 3.3 µA @ 3 V, while the BZV55-B6V2,115 specifies 3 µA @ 4 V. These measurements occur at different bias voltages and represent comparable leakage performance. The BZV55-B6V2,115 demonstrates slightly lower leakage characteristics.

Q: Does the extended operating temperature range of the BZV55-B6V2,115 affect circuit design?

A: The BZV55-B6V2,115 upper temperature limit of 200°C exceeds the FLZ6V2B specification of 175°C. This provides additional thermal margin and does not introduce compatibility constraints.

Q: Why is the FLZ6V2B classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The BZV55-B6V2,115 remains in active production with established supply chain availability, making it the appropriate selection for new designs and ongoing procurement.

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