TZX3V3C-TAP Equivalent & Substitute Parts

Part Overview

The TZX3V3C-TAP is a 3.3 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. The part is supplied in Tape & Box packaging with 3100 pieces currently in stock.

Equivalent and substitute parts are identified when alternative manufacturers produce Zener diodes with matching or compatible electrical and mechanical specifications. Substitution becomes necessary due to supply chain considerations, manufacturer availability, or packaging format requirements while maintaining functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	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

Substitution of the TZX3V3C-TAP is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 3.3 V (exact match required)
Power - Max: 500 mW (exact match required)
Package / Case: DO-204AH, DO-35, Axial (mechanical compatibility)
Mounting Type: Through Hole (assembly compatibility)

Secondary Compatibility Parameters:

Operating Temperature Range: Minimum -65°C to maximum 175°C or higher
RoHS Status: ROHS3 Compliant
Tolerance: ±5% or tighter acceptable

All substitute parts listed maintain the core electrical specifications (3.3 V nominal Zener voltage and 500 mW power rating) and are packaged in the DO-35 through-hole format. Variations in impedance, reverse leakage current, and forward voltage are within acceptable ranges for functional equivalence in standard voltage regulation and protection applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom)	Power - Max	Tolerance	Operating Temperature	Package / Case	RoHS Status	Impedance (Max)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If
TZX3V3C-TAP	Vishay General Semiconductor - Diodes Division	3.3 V	500 mW	-	-65°C ~ 175°C	DO-204AH, DO-35, Axial	ROHS3 Compliant	100 Ohms	5 µA @ 1 V	1.5 V @ 200 mA
1N5226B TR PBFREE	Central Semiconductor Corp	3.3 V	500 mW	±5%	-65°C ~ 200°C	DO-204AH, DO-35, Axial	ROHS3 Compliant	28 Ohms	25 µA @ 1 V	1.1 V @ 200 mA
1N5226BTR	Fairchild Semiconductor	3.3 V	500 mW	±5%	-65°C ~ 200°C	DO-204AH, DO-35, Axial	Not specified	28 Ohms	25 µA @ 1 V	1.2 V @ 200 mA
1N746A BK PBFREE	Central Semiconductor Corp	3.3 V	500 mW	±5%	-65°C ~ 200°C	DO-204AH, DO-35, Axial	ROHS3 Compliant	28 Ohms	10 µA @ 1 V	1.5 V @ 200 mA
1N746A TR PBFREE	Central Semiconductor Corp	3.3 V	500 mW	±5%	-65°C ~ 200°C	DO-204AH, DO-35, Axial	ROHS3 Compliant	28 Ohms	10 µA @ 1 V	1.5 V @ 200 mA
BZX79C3V3	Taiwan Semiconductor Corporation	3.3 V	500 mW	±5%	-65°C ~ 175°C	DO-204AH, DO-35, Axial	ROHS3 Compliant	95 Ohms	25 µA @ 1 V	1.5 V @ 100 mA
BZX79C3V3-T50A	Fairchild Semiconductor	3.3 V	500 mW	±5%	-65°C ~ 200°C	DO-204AH, DO-35, Axial	Not specified	95 Ohms	25 µA @ 1 V	1.5 V @ 100 mA

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance status matching or exceeding the original TZX3V3C-TAP specification. Selection among substitutes is based on the following engineering considerations:

For applications requiring extended operating temperature range: The 1N5226B TR PBFREE, 1N5226BTR, 1N746A BK PBFREE, 1N746A TR PBFREE, and BZX79C3V3-T50A support operation to 200°C, compared to the TZX3V3C-TAP maximum of 175°C.

For applications with strict RoHS compliance documentation: Central Semiconductor Corp parts (1N5226B TR PBFREE, 1N746A BK PBFREE, 1N746A TR PBFREE) and Taiwan Semiconductor Corporation (BZX79C3V3) explicitly state ROHS3 compliance. Fairchild Semiconductor parts (1N5226BTR, BZX79C3V3-T50A) do not specify RoHS status in the provided data.

For packaging format requirements: Cut Tape (CT) packaging is available in 1N5226B TR PBFREE and 1N746A TR PBFREE. Bulk packaging is available in 1N746A BK PBFREE and BZX79C3V3-T50A. Tape & Reel (TR) packaging is available in BZX79C3V3.

For impedance characteristics: Parts with lower impedance (28 Ohms) include 1N5226B TR PBFREE, 1N5226BTR, 1N746A BK PBFREE, and 1N746A TR PBFREE. Parts with higher impedance (95-100 Ohms) include BZX79C3V3 and BZX79C3V3-T50A, which more closely match the original TZX3V3C-TAP impedance of 100 Ohms.

Frequently Asked Questions (FAQ)

Q: Can I substitute the TZX3V3C-TAP with any of the listed parts in my circuit?

A: Yes. All listed substitute parts maintain the core electrical specifications of 3.3 V nominal Zener voltage and 500 mW power rating in the DO-35 through-hole package. They are functionally equivalent for standard voltage regulation and protection applications.

Q: What is the difference between the various substitute part numbers?

A: The substitute parts differ in manufacturer, packaging format, and secondary electrical characteristics. All maintain the primary specifications (3.3 V, 500 mW, DO-35). Differences include impedance values (28 Ohms vs. 95-100 Ohms), reverse leakage current (5-25 µA), forward voltage drop (1.1-1.5 V), and maximum operating temperature (175°C or 200°C).

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Tape & Box, Cut Tape, Bulk, Tape & Reel) affects supply chain logistics and assembly processes but does not alter electrical performance. The DO-35 package itself is identical across all listed parts.

Q: Are all substitute parts automotive-grade?

A: The provided data specifies automotive-grade qualification (AEC-Q101) only for the original TZX3V3C-TAP. Automotive qualification status for substitute parts is not provided in the available specifications.

Q: What should I consider when selecting between substitute parts with different impedance values?

A: Impedance affects the dynamic resistance of the Zener diode at operating current. The original TZX3V3C-TAP has 100 Ohms impedance. BZX79C3V3 (95 Ohms) and BZX79C3V3-T50A (95 Ohms) provide closer impedance matching. Parts with 28 Ohms impedance (1N5226B and 1N746A series) have lower dynamic resistance, which may affect voltage regulation characteristics in sensitive applications.

Q: Can I use these parts interchangeably in existing PCB designs?

A: Yes. All substitute parts use the identical DO-35 through-hole package with axial leads. No PCB layout modifications are required for mechanical compatibility.

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

A: The ±5% tolerance indicates the acceptable variation in Zener voltage from the nominal 3.3 V specification. This means the actual Zener voltage can range from 3.135 V to 3.465 V. The original TZX3V3C-TAP does not specify a tolerance value in the provided data.

Q: How do I determine which substitute part is best for my application?

A: Selection depends on your specific requirements: operating temperature range, packaging format availability, impedance characteristics, and compliance certifications. Consult your circuit design specifications and supply chain requirements to identify the most suitable substitute.

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