TZX4V3D-TR Equivalent & Substitute Parts

Part Overview

The TZX4V3D-TR is an active-status Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates at a nominal Zener voltage of 4.3 V with a maximum power dissipation of 500 mW in a through-hole DO-35 package. The device is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH regulations. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or design flexibility needs.

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
Mounting Type	Through Hole	-
Package / Case	DO-204AH (DO-35)	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the TZX4V3D-TR is determined by the following critical parameters:

Primary Substitution Criteria:

Nominal Zener voltage of 4.3 V (±5% tolerance acceptable)
Maximum power dissipation of 500 mW
Through-hole mounting configuration
DO-35 package compatibility
ROHS3 compliance and REACH unaffected status

Secondary Compatibility Factors:

Operating temperature range (minimum -65°C required)
Impedance characteristics (maximum 100 Ohms)
Reverse leakage current specifications
Forward voltage characteristics

Parts listed as substitutes meet the primary criteria. Variations in impedance, reverse leakage, and forward voltage characteristics remain within acceptable operational limits for Zener diode applications at the specified voltage and power ratings.

Parameter Comparison

Parameter	TZX4V3D-TR (Vishay)	BZX79C4V3-T50A (onsemi)	1N5229B (TSC)	1N749A TR PBFREE (Central Semi)	NZX4V3D,133 (Nexperia)
Voltage - Zener (Nom)	4.3 V	4.3 V	4.3 V	4.3 V	4.4 V
Tolerance	-	±5%	±5%	±5%	±2%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	100 Ohms	90 Ohms	22 Ohms	22 Ohms	100 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 1.5 V	5 µA @ 1 V	5 µA @ 1 V	2 µA @ 1 V	3 µA @ 1 V
Voltage - Forward (Max) @ If	1.5 V @ 200 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 200°C	Up to 200°C (TJ)	-65 to 200°C	-55 to 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Substitutes (4.3 V Nominal):

The BZX79C4V3-T50A (onsemi), 1N5229B (Taiwan Semiconductor Corporation), and 1N749A TR PBFREE (Central Semiconductor Corp) are direct electrical equivalents to the TZX4V3D-TR. All three maintain the 4.3 V nominal Zener voltage, 500 mW power rating, and DO-35 package configuration. All substitute parts are ROHS3 compliant and REACH unaffected. The 1N5229B and 1N749A TR PBFREE offer extended upper operating temperature limits to 200°C compared to the TZX4V3D-TR specification of 175°C. The BZX79C4V3-T50A provides comparable performance with a 90 Ohm maximum impedance specification.

Near-Equivalent Substitute (4.4 V Nominal):

The NZX4V3D,133 (Nexperia USA Inc.) operates at a nominal Zener voltage of 4.4 V with ±2% tolerance, representing a 0.1 V deviation from the primary specification. This part is suitable for applications where the 4.4 V operating point is acceptable within circuit design margins. The NZX4V3D,133 maintains 500 mW power dissipation, through-hole mounting, and DO-35 package compatibility. ROHS3 compliance and REACH unaffected status are confirmed.

Compliance and Regulatory Status:

All listed substitute parts maintain active product status and full regulatory compliance. The TZX4V3D-TR carries AEC-Q101 automotive qualification; substitute parts should be evaluated for automotive-grade requirements in specific applications.

Frequently Asked Questions (FAQ)

Q: Can the BZX79C4V3-T50A replace the TZX4V3D-TR in all applications?

A: The BZX79C4V3-T50A is electrically and mechanically compatible with the TZX4V3D-TR. Both devices operate at 4.3 V nominal Zener voltage, 500 mW maximum power, and use the DO-35 package. The BZX79C4V3-T50A offers an extended upper operating temperature of 200°C versus 175°C for the TZX4V3D-TR. Packaging differs (Tape & Box versus Tape & Reel), which may affect procurement and assembly processes.

Q: What is the significance of the impedance differences between substitute parts?

A: Impedance (Zzt) affects the dynamic resistance of the Zener diode at the specified operating point. The TZX4V3D-TR specifies 100 Ohms maximum impedance. The 1N5229B and 1N749A TR PBFREE specify 22 Ohms, providing lower dynamic resistance. Lower impedance results in better voltage regulation and reduced output impedance in voltage regulation circuits. The BZX79C4V3-T50A at 90 Ohms and NZX4V3D,133 at 100 Ohms remain within comparable performance ranges.

Q: Is the NZX4V3D,133 with 4.4 V nominal voltage suitable as a substitute?

A: The NZX4V3D,133 operates at 4.4 V nominal Zener voltage, representing a 0.1 V (2.3%) increase from the TZX4V3D-TR specification of 4.3 V. Substitution is application-dependent. Circuits designed with 4.3 V regulation requirements may experience voltage regulation shifts. The NZX4V3D,133 is suitable for applications where the 4.4 V operating point falls within acceptable design tolerances.

Q: What packaging differences exist between substitute parts?

A: The TZX4V3D-TR is supplied in Tape & Reel (TR) packaging. The BZX79C4V3-T50A uses Tape & Box (TB) packaging. The 1N749A TR PBFREE and NZX4V3D,133 use Cut Tape (CT) packaging. The 1N5229B is supplied in Tape & Reel (TR). All parts use identical DO-35 package geometry for through-hole mounting. Packaging format affects component handling, storage, and automated assembly compatibility.

Q: Are all substitute parts rated for automotive applications?

A: The TZX4V3D-TR carries AEC-Q101 automotive qualification. The substitute parts listed do not explicitly reference AEC-Q101 qualification in the provided specifications. Applications requiring automotive-grade components should verify AEC-Q101 compliance with manufacturers before substitution.

Q: How do reverse leakage current specifications compare?

A: The TZX4V3D-TR specifies 5 µA reverse leakage at 1.5 V. The BZX79C4V3-T50A, 1N5229B, and NZX4V3D,133 specify 5 µA, 5 µA, and 3 µA respectively at 1 V. The 1N749A TR PBFREE specifies 2 µA at 1 V. Lower reverse leakage current indicates reduced off-state current and improved circuit performance in high-impedance applications. Differences in measurement voltage (1.5 V versus 1 V) affect direct comparison.

Q: What is the impact of forward voltage differences?

A: Forward voltage (Vf) specifications vary across substitute parts. The TZX4V3D-TR specifies 1.5 V maximum at 200 mA forward current. The 1N5229B specifies 1.1 V at 200 mA, representing lower forward voltage drop. Lower forward voltage reduces power dissipation during forward conduction. The BZX79C4V3-T50A specifies 1.5 V at 100 mA (lower current reference), affecting direct comparison. Forward voltage characteristics are secondary considerations in Zener diode voltage regulation applications.

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