FLZ39VB Zener Diode Equivalent & Substitute Parts

Part Overview

The FLZ39VB is a 36.3 V, 500 mW Zener diode manufactured by onsemi in SOD-80 surface mount packaging. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part operates across a temperature range of -65°C to 175°C and features ±3% voltage tolerance with a maximum impedance of 72 Ohms.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	36.3	V
Tolerance	±3%	-
Power - Maximum	500	mW
Impedance (Maximum)	72	Ohms
Current - Reverse Leakage @ Vr	133 nA @ 30 V	-
Voltage - Forward (Maximum) @ If	1.2 V @ 200 mA	-
Operating Temperature Range	-65°C to 175°C	-
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution of the FLZ39VB is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Zener voltage within acceptable circuit tolerance (36.3 V nominal)
Power dissipation rating of 500 mW minimum
Surface mount package compatibility (SOD-80 / DO-213AC / MINI-MELF)
Operating temperature range encompassing -65°C to 175°C
Reverse leakage characteristics suitable for the application

Mechanical Compatibility Criteria:

Identical or compatible package footprint (SOD-80)
Surface mount mounting type

The BZV55-B36,115 manufactured by NXP Semiconductors meets these substitution criteria. While the nominal Zener voltage is specified at 36 V (compared to 36.3 V), this represents a 0.83% deviation within typical circuit tolerance margins. The part maintains identical power rating, compatible packaging, and active product status.

Parameter Comparison

Parameter	FLZ39VB (onsemi)	BZV55-B36,115 (NXP)	Compatibility Notes
Voltage - Zener (Nominal)	36.3 V	36 V	0.83% deviation; within typical tolerance
Tolerance	±3%	±2%	NXP part offers tighter tolerance
Power - Maximum	500 mW	500 mW	Identical rating
Impedance (Maximum)	72 Ohms	90 Ohms	NXP part 25% higher; acceptable for most applications
Current - Reverse Leakage @ Vr	133 nA @ 30 V	50 nA @ 700 mV	NXP part exhibits lower leakage; measured at different voltage
Voltage - Forward (Maximum) @ If	1.2 V @ 200 mA	900 mV @ 10 mA	Measured at different current levels; not directly comparable
Operating Temperature Range	-65°C to 175°C	-65°C to 200°C	NXP part extends upper limit by 25°C
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	Identical packaging
Product Status	Obsolete	Active	NXP part actively manufactured and supported

Engineering Selection Recommendations

The BZV55-B36,115 (NXP Semiconductors) is a direct functional substitute for the obsolete FLZ39VB. Selection of this substitute is based on the following engineering factors:

Product Status and Availability: The FLZ39VB is classified as obsolete, whereas the BZV55-B36,115 maintains active product status with established supply chain availability (773,458 units in stock).

Electrical Performance: Both components share identical 500 mW power ratings and compatible surface mount packaging. The nominal Zener voltage differential of 0.3 V (36.3 V to 36 V) represents a 0.83% deviation, which falls within standard circuit tolerance specifications for Zener diode applications.

Compliance and Certifications: Both parts maintain REACH Unaffected status and identical Moisture Sensitivity Level (MSL) classification of 1 (Unlimited), ensuring equivalent environmental and regulatory compliance.

Temperature Performance: The NXP substitute extends the upper operating temperature limit to 200°C, providing enhanced thermal margin compared to the 175°C maximum of the onsemi part.

Package Compatibility: Identical DO-213AC / MINI-MELF / SOD-80 packaging ensures direct footprint compatibility without PCB redesign requirements.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-B36,115 be used as a direct replacement for the FLZ39VB without circuit modifications?

A: Yes. Both components share identical power ratings (500 mW), compatible surface mount packaging (SOD-80), and equivalent operating temperature ranges. The 0.3 V nominal voltage difference (36.3 V to 36 V) represents a 0.83% deviation, which is within standard Zener diode circuit tolerance specifications.

Q: What is the significance of the voltage tolerance difference (±3% vs ±2%)?

A: The BZV55-B36,115 offers tighter voltage tolerance (±2%) compared to the FLZ39VB (±3%). This represents improved voltage regulation performance and may provide enhanced circuit stability in applications requiring precise voltage reference characteristics.

Q: Are the impedance specifications compatible?

A: The BZV55-B36,115 specifies a maximum impedance of 90 Ohms compared to 72 Ohms for the FLZ39VB. This 25% increase in impedance is acceptable for most Zener diode applications and does not preclude substitution in standard voltage regulation circuits.

Q: Does the extended temperature range of the NXP part provide any advantage?

A: The BZV55-B36,115 operates to 200°C maximum, compared to 175°C for the FLZ39VB. This 25°C extension provides additional thermal margin in high-temperature environments and may improve long-term reliability in applications approaching the upper temperature limit.

Q: Are there any compliance or regulatory differences between these parts?

A: Both components maintain identical REACH Unaffected status and MSL classification of 1 (Unlimited). No compliance or regulatory differences exist between the two parts.

Q: What is the primary reason for substitution?

A: The FLZ39VB is classified as obsolete. The BZV55-B36,115 is an active product with established manufacturing and supply chain support, ensuring long-term availability for production and design requirements.

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