FLZ22VB Equivalent & Substitute Parts

Part Overview

The FLZ22VB is a Zener diode manufactured by onsemi, rated at 21.2 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.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	21.2 V
Power - Max	500 mW
Tolerance	±3%
Impedance (Max)	25.6 Ohms
Current - Reverse Leakage @ Vr	133 nA @ 17 V
Voltage - Forward (Max) @ If	1.2 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80
Moisture Sensitivity Level	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the FLZ22VB is determined by alignment of the following critical parameters:

Zener Voltage Compatibility: The FLZ22VB operates at 21.2 V nominal. Substitute parts must operate within the circuit's voltage regulation requirements, accounting for tolerance specifications.

Power Dissipation Rating: Both the main part and substitute must support 500 mW maximum power dissipation to ensure thermal performance equivalence.

Package and Mounting: Surface mount configuration in SOD-80 (DO-213AC, MINI-MELF) packaging ensures mechanical and electrical compatibility with existing PCB layouts.

Temperature Operating Range: The substitute must support the required temperature envelope for the application.

Regulatory Compliance: REACH status and moisture sensitivity classification must align with application requirements.

The BZV55-C22,115 manufactured by NXP Semiconductors satisfies these substitution criteria through equivalent power rating, compatible packaging, and overlapping operational specifications.

Parameter Comparison

Parameter	FLZ22VB (onsemi)	BZV55-C22,115 (NXP)
Voltage - Zener (Nom)	21.2 V	22 V
Tolerance	±3%	±5%
Power - Max	500 mW	500 mW
Impedance (Max)	25.6 Ohms	55 Ohms
Current - Reverse Leakage @ Vr	133 nA @ 17 V	50 nA @ 15.4 V
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	900 mV @ 10 mA
Operating Temperature Range	-65°C ~ 175°C	-65°C ~ 200°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active

Engineering Selection Recommendations

The BZV55-C22,115 is an active product with current manufacturing support and established supply chain availability, addressing the obsolescence status of the FLZ22VB. Both components share identical power ratings, package configurations, and moisture sensitivity classifications, ensuring direct mechanical compatibility.

The nominal voltage difference of 0.8 V (21.2 V versus 22 V) represents a 3.8% variance. Circuit designs must accommodate this voltage differential within their regulation tolerance specifications. The substitute part exhibits wider voltage tolerance (±5% versus ±3%), which may impact precision voltage regulation applications.

The BZV55-C22,115 provides an extended operating temperature range to 200°C, exceeding the FLZ22VB specification. Both components maintain REACH compliance and unlimited moisture sensitivity classification, supporting equivalent environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-C22,115 directly replace the FLZ22VB in all applications?

A: Direct mechanical replacement is supported through identical SOD-80 packaging. Electrical compatibility depends on circuit tolerance for the 0.8 V nominal voltage difference and the wider ±5% tolerance specification of the substitute part. Circuit analysis is required to confirm voltage regulation performance.

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

A: The FLZ22VB exhibits 25.6 Ohms maximum impedance while the BZV55-C22,115 specifies 55 Ohms. Higher impedance affects dynamic response characteristics and voltage regulation under transient conditions. Applications requiring precise transient suppression or low-impedance regulation should evaluate this parameter against circuit requirements.

Q: Are there temperature range considerations for substitution?

A: The BZV55-C22,115 supports operation to 200°C, exceeding the FLZ22VB maximum of 175°C. For applications operating within the FLZ22VB range, the substitute provides equivalent or superior thermal performance. Applications requiring operation above 175°C benefit from the extended range of the substitute part.

Q: How do the reverse leakage specifications compare?

A: The BZV55-C22,115 exhibits lower reverse leakage (50 nA @ 15.4 V) compared to the FLZ22VB (133 nA @ 17 V). Lower leakage current reduces standby power consumption and improves voltage regulation stability, particularly in precision applications.

Q: What packaging options are available for both parts?

A: Both the FLZ22VB and BZV55-C22,115 are supplied in DO-213AC, MINI-MELF, and SOD-80 configurations. These surface mount packages are mechanically and electrically equivalent, supporting direct PCB layout compatibility without redesign.

Q: Is the BZV55-C22,115 available in production quantities?

A: The BZV55-C22,115 maintains active product status with established supply chain support. The FLZ22VB is classified as obsolete, making the NXP substitute the recommended choice for new designs and ongoing procurement requirements.

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