FLZ4V3B Zener Diode Equivalent & Substitute Parts

Part Overview

The FLZ4V3B is a 4.3 V Zener diode rated at 500 mW in a surface mount SOD-80 (DO-213AC, MINI-MELF) package manufactured by onsemi. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical performance within the specified voltage, power, and thermal operating parameters while accommodating the surface mount package configuration.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	4.3	V
Power - Maximum	500	mW
Tolerance	±3%	-
Impedance (Maximum)	32	Ohms
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-

Substitute Part Grouping Explanation

Substitution of the FLZ4V3B is determined by the following critical parameters:

Electrical Compatibility Requirements:

Zener voltage nominal value of 4.3 V
Maximum power dissipation of 500 mW
Surface mount mounting type
Package compatibility with DO-213AC, MINI-MELF, or SOD-80 designations

Acceptable Parameter Variations:

Voltage tolerance may differ from the original ±3% specification
Impedance values may vary within the range of substitute parts
Reverse leakage current specifications may differ
Forward voltage characteristics may vary
Operating temperature range may extend beyond the original -65°C to 175°C specification

All identified substitute parts meet the core electrical requirements of 4.3 V nominal zener voltage and 500 mW power rating in compatible surface mount packages.

Parameter Comparison

Parameter	FLZ4V3B (onsemi)	BZV55-B4V3,115 (NXP)	TLZ4V3A-GS08 (Vishay)	TLZ4V3A-GS18 (Vishay)
Voltage - Zener (Nom)	4.3 V	4.3 V	4.3 V	4.3 V
Tolerance	±3%	±2%	-	-
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	32 Ohms	90 Ohms	40 Ohms	40 Ohms
Current - Reverse Leakage @ Vr	470 nA @ 1 V	3 µA @ 1 V	3 µA @ 1 V	3 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	900 mV @ 10 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C to 175°C	-65°C to 200°C	-65°C to 175°C	-65°C to 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

BZV55-B4V3,115 (NXP USA Inc.): This part is an active product with improved voltage tolerance (±2% versus ±3%) and extended operating temperature range to 200°C. The higher impedance specification (90 Ohms) may affect circuit performance in applications sensitive to dynamic impedance characteristics. This substitute is suitable for designs where tighter voltage tolerance and extended temperature operation are beneficial.

TLZ4V3A-GS08 (Vishay General Semiconductor - Diodes Division): This part is an active product supplied in Tape & Reel packaging. It maintains the original operating temperature range and provides impedance specification (40 Ohms) closer to the original part. RoHS3 compliance is confirmed. This substitute is suitable for high-volume production environments utilizing automated assembly processes.

TLZ4V3A-GS18 (Vishay General Semiconductor - Diodes Division): This part is an active product with identical electrical specifications to TLZ4V3A-GS08, also supplied in Tape & Reel packaging with RoHS3 compliance. Lower inventory availability (1052 Pcs) compared to TLZ4V3A-GS08 (17900 Pcs) may affect procurement lead times. This substitute is functionally equivalent to TLZ4V3A-GS08.

All substitute parts are classified as EAR99 and maintain REACH Unaffected status consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-B4V3,115 be used as a direct replacement for the FLZ4V3B?

A: Yes. Both parts share the same 4.3 V nominal zener voltage, 500 mW power rating, and surface mount SOD-80 package. The BZV55-B4V3,115 features improved voltage tolerance (±2%) and extended operating temperature to 200°C. The impedance specification differs (90 Ohms versus 32 Ohms), which may affect circuit behavior in applications with specific impedance requirements.

Q: What is the difference between TLZ4V3A-GS08 and TLZ4V3A-GS18?

A: Both parts are electrically identical with 4.3 V nominal voltage, 500 mW power rating, and SOD-80 package configuration. The primary difference is inventory availability, with TLZ4V3A-GS08 having significantly higher stock levels (17900 Pcs versus 1052 Pcs). Both are supplied in Tape & Reel packaging and carry RoHS3 compliance.

Q: Are all substitute parts compatible with the original SOD-80 package footprint?

A: Yes. All substitute parts utilize the DO-213AC, MINI-MELF, SOD-80 package designation, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the FLZ4V3B.

Q: Does the impedance difference between substitute parts affect circuit performance?

A: Impedance specifications vary among substitutes: FLZ4V3B (32 Ohms), TLZ4V3A-GS08/GS18 (40 Ohms), and BZV55-B4V3,115 (90 Ohms). Applications with dynamic impedance sensitivity or high-frequency operation may require circuit validation when substituting parts with significantly different impedance values.

Q: Are all substitute parts RoHS compliant?

A: The Vishay parts (TLZ4V3A-GS08 and TLZ4V3A-GS18) carry explicit RoHS3 compliance certification. The NXP part (BZV55-B4V3,115) does not list RoHS status in the provided specifications. Verify RoHS compliance requirements with the NXP supplier if mandated by your application or regulatory framework.

Q: What is the impact of the extended temperature range in the BZV55-B4V3,115?

A: The BZV55-B4V3,115 operates to 200°C compared to 175°C for the original FLZ4V3B and Vishay substitutes. This extended range provides additional thermal margin for applications operating at elevated temperatures but does not affect performance in standard temperature environments.

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