TZX4V3C-TAP Equivalent & Substitute Parts

Part Overview

The TZX4V3C-TAP is a 4.3 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component operates across a temperature range of -65°C to 175°C and is qualified to AEC-Q101 automotive standards. The part is actively produced and available in high inventory quantities (25,100 pieces). Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and regulatory compliance to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	4.3	V
Power - Maximum	500	mW
Impedance (Maximum)	100	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1.5 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH (DO-35)	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of the TZX4V3C-TAP is determined by the following critical parameters:

Electrical Compatibility Criteria:

Zener voltage (Vz) must equal 4.3 V nominal
Maximum power dissipation must be 500 mW or greater
Operating temperature range must encompass the application requirements
Reverse leakage current and forward voltage characteristics must be within acceptable limits for the circuit design

Mechanical Compatibility Criteria:

Package type must be DO-204AH (DO-35) axial through-hole configuration
Mounting type must be through-hole

Regulatory & Compliance Criteria:

RoHS3 compliance status
REACH compliance status
Automotive qualification (AEC-Q101) for applications requiring automotive-grade components

All substitute parts listed maintain the 4.3 V nominal Zener voltage and 500 mW power rating. Variations in impedance, tolerance, and temperature range are noted in the parameter comparison table to support application-specific selection.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS Status
TZX4V3C-TAP	Vishay	4.3 V	-	500 mW	100 Ω	5 µA @ 1.5 V	1.5 V @ 200 mA	-65 to 175°C	DO-35	ROHS3
BZX79C4V3	Taiwan Semiconductor	4.3 V	±5%	500 mW	90 Ω	5 µA @ 1 V	1.5 V @ 100 mA	-65 to 175°C	DO-35	ROHS3
BZX79C4V3-T50A	onsemi	4.3 V	±5%	500 mW	90 Ω	5 µA @ 1 V	1.5 V @ 100 mA	-65 to 200°C	DO-35	ROHS3
1N4687	Microchip Technology	4.3 V	±5%	500 mW	-	4 µA @ 2 V	1.1 V @ 200 mA	-65 to 175°C	DO-35	Non-compliant
1N5229B	Taiwan Semiconductor	4.3 V	±5%	500 mW	22 Ω	5 µA @ 1 V	1.1 V @ 200 mA	-65 to 200°C	DO-35	ROHS3
1N749A TR PBFREE	Central Semiconductor	4.3 V	±5%	500 mW	22 Ω	2 µA @ 1 V	1.5 V @ 200 mA	-65 to 200°C	DO-35	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

BZX79C4V3 and BZX79C4V3-T50A are direct electrical equivalents with identical Zener voltage, power rating, and package configuration. Both are RoHS3 compliant and maintain the -65°C to 175°C operating range (BZX79C4V3-T50A extends to 200°C). These parts are suitable for applications where the TZX4V3C-TAP is unavailable.

Secondary Substitutes (Conditional Compatibility):

1N5229B and 1N749A TR PBFREE maintain the 4.3 V Zener voltage and 500 mW power rating with RoHS3 compliance. Both extend the upper operating temperature to 200°C. The 1N5229B features lower impedance (22 Ω) and the 1N749A TR PBFREE provides lower reverse leakage current (2 µA @ 1 V). These parts are suitable for applications not requiring automotive AEC-Q101 qualification.

Non-Recommended Substitute:

1N4687 (Microchip Technology) is RoHS non-compliant and does not meet current regulatory requirements for new designs. This part is listed for reference only in legacy or existing inventory scenarios.

Automotive Applications:

For applications requiring AEC-Q101 automotive qualification, the TZX4V3C-TAP is the specified component. No substitute parts in this list carry explicit automotive qualification. Verification of automotive requirements with the component manufacturer is necessary before substitution in qualified designs.

Frequently Asked Questions (FAQ)

Q: Can BZX79C4V3 replace TZX4V3C-TAP in all applications?

A: BZX79C4V3 is electrically and mechanically compatible with identical Zener voltage (4.3 V), power rating (500 mW), and package (DO-35). Both are RoHS3 compliant and operate across -65°C to 175°C. The primary difference is packaging format (Tape & Reel versus Tape & Box). Substitution is valid for non-automotive applications. Automotive applications require verification of AEC-Q101 qualification status.

Q: What is the difference between BZX79C4V3 and BZX79C4V3-T50A?

A: Both parts are electrically identical with 4.3 V Zener voltage and 500 mW power rating. BZX79C4V3-T50A extends the maximum operating temperature to 200°C (versus 175°C for BZX79C4V3). Selection depends on application temperature requirements. Both are RoHS3 compliant.

Q: Why is 1N4687 listed if it is RoHS non-compliant?

A: 1N4687 is included as a manufacturer-recommended substitute in the source data. However, RoHS non-compliance disqualifies it from new designs and applications subject to RoHS3 regulations. This part is referenced for legacy system maintenance only.

Q: What does impedance (Zzt) variation mean for circuit performance?

A: Impedance affects the Zener diode's dynamic response and voltage regulation characteristics. The TZX4V3C-TAP specifies 100 Ω maximum impedance. Substitute parts with lower impedance (BZX79C4V3 at 90 Ω, 1N5229B and 1N749A TR PBFREE at 22 Ω) provide improved transient response and tighter voltage regulation. Lower impedance is generally beneficial for voltage reference and protection applications.

Q: Are all substitute parts available in the same packaging formats?

A: No. The TZX4V3C-TAP is supplied in Tape & Box (TB) format. BZX79C4V3 is supplied in Tape & Reel (TR), BZX79C4V3-T50A in Tape & Box (TB), 1N4687 in Bulk, 1N5229B in Tape & Reel (TR), and 1N749A TR PBFREE in Cut Tape (CT). Packaging format affects procurement, handling, and assembly processes. Verify packaging compatibility with manufacturing requirements before substitution.

Q: Can substitute parts be used in automotive-grade designs?

A: The TZX4V3C-TAP carries AEC-Q101 automotive qualification. Substitute parts in this list do not explicitly state automotive qualification. For designs requiring automotive-grade components, use the TZX4V3C-TAP or obtain written confirmation of AEC-Q101 qualification from the substitute part manufacturer.

Q: What is the significance of tolerance (±5%) on substitute parts?

A: The TZX4V3C-TAP does not specify tolerance. Substitute parts with ±5% tolerance indicate the Zener voltage will be within 4.085 V to 4.515 V. For precision voltage reference applications, verify that ±5% tolerance meets circuit design specifications. Tighter tolerance may require alternative part selection.

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