TZX4V3A-TR Equivalent & Substitute Parts

Part Overview

The TZX4V3A-TR is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 4.3 V nominal with 500 mW power dissipation capability. The device is packaged in DO-204AH (DO-35) axial configuration and supplied on Tape & Reel (TR). This part is Active status and qualified to AEC-Q101 automotive standards, making it suitable for automotive and industrial applications requiring voltage regulation and transient protection.

Equivalent and substitute parts are identified based on matching critical electrical parameters: nominal Zener voltage (4.3 V), maximum power rating (500 mW), through-hole mounting compatibility, and DO-35 package form factor. Alternative sources provide functional equivalence while maintaining compliance with RoHS3 and REACH regulations.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.3	V
Power - Max	500	mW
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Operating Temperature Range	-65°C ~ 175°C	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on electrical and mechanical compatibility with the TZX4V3A-TR:

Primary Substitutes (Direct Equivalents): Parts matching 4.3 V nominal Zener voltage, 500 mW power rating, DO-35 package, and through-hole mounting. These parts maintain functional equivalence across voltage regulation and transient suppression applications.

Secondary Substitutes (Voltage Variant): Parts with nominal Zener voltage of 4.1 V instead of 4.3 V. These are included based on the original part's substitute list but represent a 0.2 V deviation from the primary specification. Selection of secondary substitutes requires circuit-level voltage tolerance verification.

Critical Parameters for Substitution:

Nominal Zener voltage: 4.3 V (primary) or 4.1 V (secondary)
Maximum power dissipation: 500 mW
Package form: DO-35 (DO-204AH) axial
Mounting: Through-hole
Compliance: RoHS3, REACH Unaffected

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom) [V]	Power Max [mW]	Tolerance	Zzt Max [Ohms]	Vf Max @ If [V @ mA]	Operating Temp [°C]	Package	RoHS3
TZX4V3A-TR	Vishay General Semiconductor	4.3	500	—	100	1.5 @ 200	-65 ~ 175	DO-35	Compliant
BZX79C4V3	Taiwan Semiconductor Corporation	4.3	500	±5%	90	1.5 @ 100	-65 ~ 175	DO-35	Compliant
BZX79C4V3-T50A	onsemi	4.3	500	±5%	90	1.5 @ 100	-65 ~ 200	DO-35	Compliant
1N5229B	Taiwan Semiconductor Corporation	4.3	500	±5%	22	1.1 @ 200	-65 ~ 200	DO-35	Compliant
1N5229BTR	Fairchild Semiconductor	4.3	500	—	22	—	—	DO-35	—
1N749A BK PBFREE	Central Semiconductor Corp	4.3	500	±5%	22	1.5 @ 200	-65 ~ 200	DO-35	Compliant
NZX4V3A,133	Nexperia USA Inc.	4.1	500	±2%	100	1.5 @ 200	-55 ~ 175	DO-35	Compliant

Engineering Selection Recommendations

For Direct Replacement (4.3 V Specification):

BZX79C4V3, BZX79C4V3-T50A, 1N5229B, 1N5229BTR, and 1N749A BK PBFREE all maintain the 4.3 V nominal Zener voltage specification. These parts are suitable for applications where the 4.3 V regulation point is a circuit requirement. BZX79C4V3-T50A offers extended operating temperature range to 200°C, providing additional thermal margin in high-temperature environments. 1N5229B and 1N749A BK PBFREE feature lower dynamic impedance (22 Ohms versus 100 Ohms), resulting in improved voltage regulation stability under load transients.

For Voltage-Tolerant Applications (4.1 V Alternative):

NZX4V3A,133 provides a 4.1 V nominal Zener voltage with tighter tolerance (±2% versus ±5% for most alternatives). This part is suitable only in applications where a 0.2 V deviation from 4.3 V is acceptable. The tighter tolerance specification may benefit precision voltage reference circuits. Operating temperature range is -55°C to 175°C, which is narrower than the primary part.

Compliance and Qualification:

All substitute parts listed are RoHS3 compliant and REACH unaffected. The original TZX4V3A-TR carries AEC-Q101 automotive qualification. Substitute parts do not explicitly list AEC-Q101 qualification in the provided data; applications requiring automotive qualification should verify qualification status with the respective manufacturer.

Frequently Asked Questions (FAQ)

Q: Can BZX79C4V3 replace TZX4V3A-TR in automotive applications?

A: BZX79C4V3 matches the electrical specifications (4.3 V, 500 mW, DO-35 package) and is RoHS3 compliant. However, the original TZX4V3A-TR carries AEC-Q101 automotive qualification. Substitution in automotive applications requires verification that BZX79C4V3 meets the same qualification standard or that the application does not mandate AEC-Q101 certification.

Q: What is the difference between 1N5229B and 1N749A BK PBFREE?

A: Both parts are rated 4.3 V, 500 mW, DO-35 package. Key differences are: 1N5229B has maximum operating temperature of 200°C versus 1N749A BK PBFREE at 200°C (equivalent). 1N749A BK PBFREE specifies lower reverse leakage current (2 µA @ 1 V versus 5 µA @ 1 V). Both have 22 Ohms dynamic impedance. Selection depends on leakage current and temperature requirements of the specific application.

Q: Why is NZX4V3A,133 listed as a substitute if it is 4.1 V instead of 4.3 V?

A: NZX4V3A,133 is included because it appears in the original part's substitute list. The 0.2 V difference (4.1 V versus 4.3 V) represents a 4.7% deviation from the primary specification. This part is suitable only for applications where the Zener voltage can tolerate this deviation or where 4.1 V is an acceptable operating point. Circuit-level analysis is required before substitution.

Q: Are all substitute parts available in Tape & Reel packaging?

A: No. The original TZX4V3A-TR is supplied on Tape & Reel (TR). BZX79C4V3 is supplied on Tape & Reel. BZX79C4V3-T50A is supplied on Tape & Box (TB). 1N5229B, 1N5229BTR, 1N749A BK PBFREE, and NZX4V3A,133 are supplied in Bulk or Cut Tape (CT) packaging. Packaging selection affects component handling, automated assembly compatibility, and storage requirements.

Q: What is the significance of impedance (Zzt) differences among substitutes?

A: Dynamic impedance (Zzt) affects voltage regulation quality under load changes. Lower impedance (22 Ohms for 1N5229B, 1N5229BTR, 1N749A BK PBFREE) provides better voltage stability and faster transient response compared to higher impedance (90-100 Ohms for BZX79C4V3, BZX79C4V3-T50A, NZX4V3A,133). Applications requiring tight voltage regulation under dynamic load conditions benefit from lower impedance parts.

Q: Can TZX4V3A-TR be substituted with BZX79C4V3-T50A for high-temperature applications?

A: BZX79C4V3-T50A extends the operating temperature range to 200°C compared to TZX4V3A-TR at 175°C. This provides additional thermal margin. However, BZX79C4V3-T50A does not carry explicit AEC-Q101 qualification. For automotive high-temperature applications, verify that the extended temperature capability does not compromise other automotive qualification requirements.

Q: What packaging considerations apply when substituting TZX4V3A-TR?

A: The original part is supplied on Tape & Reel (TR), standard for automated assembly. Substitute parts use Tape & Reel (BZX79C4V3), Tape & Box (BZX79C4V3-T50A), Bulk (1N5229B, 1N5229BTR, 1N749A BK PBFREE), or Cut Tape (NZX4V3A,133). Bulk and Cut Tape packaging require manual handling or reel conversion for automated pick-and-place equipment. Verify packaging compatibility with assembly processes before substitution.

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