TZX4V3A-TAP Equivalent & Substitute Parts

Part Overview

The TZX4V3A-TAP is a 4.3 V Zener diode rated at 500 mW in a DO-35 through-hole package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as an active product with automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. Substitute parts are identified when inventory constraints, packaging format requirements, or manufacturer availability necessitate alternative sourcing while maintaining electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.3	V
Power - Max	500	mW
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1.5 V
Voltage - Forward (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-204AH (DO-35)	Axial
Mounting Type	Through Hole	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the TZX4V3A-TAP is determined by the following critical parameters:

Electrical Compatibility Criteria:

Zener voltage (Nom): 4.3 V
Maximum power dissipation: 500 mW
Package type: DO-35 (DO-204AH) through-hole axial configuration
Operating temperature range: minimum -65°C to 175°C

Compliance & Certification:

RoHS3 compliance required
REACH unaffected status
Active product status

All substitute parts listed maintain the 4.3 V nominal zener voltage and 500 mW power rating. Variations in impedance, forward voltage, reverse leakage current, and tolerance specifications are within acceptable ranges for zener diode substitution. Packaging format differences (Tape & Reel, Tape & Box, Bulk, Cut Tape) do not affect electrical performance and are selected based on procurement and assembly requirements.

Parameter Comparison

Parameter	TZX4V3A-TAP (Main)	BZX79C4V3	BZX79C4V3-T50A	1N5229B	1N749A BK PBFREE	1N749A TR PBFREE
Manufacturer	Vishay	Taiwan Semiconductor	onsemi	Taiwan Semiconductor	Central Semiconductor	Central Semiconductor
Voltage - Zener (Nom)	4.3 V	4.3 V	4.3 V	4.3 V	4.3 V	4.3 V
Tolerance	-	±5%	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	100 Ohms	90 Ohms	90 Ohms	22 Ohms	22 Ohms	22 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 1.5 V	5 µA @ 1 V	5 µA @ 1 V	5 µA @ 1 V	2 µA @ 1 V	2 µA @ 1 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 100 mA	1.5 V @ 100 mA	1.1 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature Range	-65 to 175°C	-65 to 175°C	-65 to 200°C	200°C (TJ)	-65 to 200°C	-65 to 200°C
Package / Case	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and RoHS3 compliance, ensuring regulatory and supply chain continuity. Selection among substitutes is determined by packaging format availability and procurement requirements:

BZX79C4V3 (Taiwan Semiconductor Corporation) and BZX79C4V3-T50A (onsemi) provide direct electrical equivalence with impedance values of 90 Ohms, closely matching the main part specification. The onsemi variant extends the operating temperature range to 200°C, providing additional thermal margin for applications requiring extended temperature operation.

1N5229B (Taiwan Semiconductor Corporation), 1N749A BK PBFREE, and 1N749A TR PBFREE (Central Semiconductor Corp) feature lower impedance values of 22 Ohms and reduced reverse leakage current (2 µA), resulting in improved voltage regulation characteristics. These parts are suitable for applications where tighter voltage regulation is required. The 1N749A variants are available in bulk and cut tape packaging formats, while 1N5229B is supplied in tape and reel format.

All substitute parts are qualified for through-hole assembly in DO-35 packages and maintain compatibility with existing PCB designs. Selection should be based on packaging format requirements, inventory availability, and thermal performance needs of the specific application.

Frequently Asked Questions (FAQ)

Q: Can BZX79C4V3 directly replace TZX4V3A-TAP in all applications?

A: Yes. Both parts share identical nominal zener voltage (4.3 V) and power rating (500 mW) in the same DO-35 package. The impedance difference (90 Ohms vs. 100 Ohms) and operating temperature range (-65 to 175°C for both) are compatible. Packaging format differs (Tape & Reel vs. Tape & Box), which affects procurement and assembly handling but not electrical performance.

Q: What is the difference between 1N749A BK PBFREE and 1N749A TR PBFREE?

A: Both parts are electrically identical 4.3 V, 500 mW zener diodes from Central Semiconductor Corp with identical electrical specifications. The difference is packaging format: BK PBFREE is supplied in bulk packaging, while TR PBFREE is supplied in cut tape format. Selection depends on assembly process requirements and inventory management practices.

Q: Why do some substitute parts have lower impedance values?

A: Impedance variation (22 Ohms vs. 100 Ohms) reflects different internal device designs while maintaining the same nominal zener voltage and power rating. Lower impedance values (1N5229B and 1N749A series) provide improved voltage regulation and lower dynamic resistance, making them suitable for applications requiring tighter voltage stability. Both impedance ranges are acceptable for standard zener diode applications.

Q: Are all substitute parts suitable for automotive applications?

A: The main part TZX4V3A-TAP carries automotive-grade qualification (AEC-Q101). Substitute parts do not explicitly list AEC-Q101 qualification in the provided specifications. For automotive applications requiring AEC-Q101 certification, verify qualification status with the respective manufacturer before substitution.

Q: What is the significance of the extended temperature range in BZX79C4V3-T50A?

A: BZX79C4V3-T50A (onsemi) operates from -65°C to 200°C, compared to -65°C to 175°C for the main part. This extended upper temperature limit provides additional thermal margin for applications operating in high-temperature environments. All other electrical parameters remain equivalent.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. All substitute parts use the DO-35 through-hole axial package with identical pin configuration and footprint. No PCB layout modifications are required. Packaging format differences (Tape & Reel, Tape & Box, Bulk, Cut Tape) affect only the supply format and assembly equipment compatibility, not the component installation.

Q: What does ROHS3 compliance indicate?

A: ROHS3 compliance confirms that all substitute parts meet Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed parts maintain ROHS3 compliance, ensuring regulatory compliance for both new designs and legacy system replacements.

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