TZX3V3A-TAP Equivalent & Substitute Parts

Part Overview

The TZX3V3A-TAP is a 3.3 V Zener diode rated at 500 mW, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component operates across a temperature range of -65°C to 175°C and meets AEC-Q101 automotive qualification standards. The device is packaged in DO-204AH (DO-35) axial configuration and is ROHS3 compliant.

Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity. Substitute components maintain electrical and mechanical compatibility within the specified parameter tolerances for this Zener diode category.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Power - Max	500	mW
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-

Substitute Part Grouping Explanation

Substitution eligibility for the TZX3V3A-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 3.3 V nominal
Power dissipation: 500 mW maximum
Package type: DO-204AH (DO-35) through-hole axial configuration
Operating temperature range: minimum -65°C to 175°C

Secondary Compatibility Factors:

Impedance (Zzt): Maximum 100 Ohms
Reverse leakage current: Maximum 5 µA @ 1 V
Forward voltage: Maximum 1.5 V @ 200 mA
Voltage tolerance: ±5% or tighter

All identified substitute parts meet the primary matching criteria. Variations in secondary parameters are noted in the comparison table and reflect manufacturer-specific design characteristics that remain within acceptable operational limits for this component category.

Parameter Comparison

Parameter	TZX3V3A-TAP (Vishay)	1N5226B (Microchip)	1N5226B TR PBFREE (Central Semi)	1N5226BTR (Fairchild)	1N746A BK PBFREE (Central Semi)	BZX79C3V3-T50A (Fairchild)
Voltage - Zener (Nom)	3.3 V	3.3 V	3.3 V	3.3 V	3.3 V	3.3 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	28 Ohms	28 Ohms	28 Ohms	28 Ohms	95 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 1 V	25 µA @ 1 V	25 µA @ 1 V	25 µA @ 1 V	10 µA @ 1 V	25 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 100 mA
Operating Temperature	-65 to 175°C	-65 to 175°C (TJ)	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility):

The 1N5226B TR PBFREE (Central Semiconductor Corp) is the preferred substitute. This part maintains full electrical equivalence with the TZX3V3A-TAP while offering ROHS3 compliance, extended operating temperature range (-65°C to 200°C), and superior forward voltage characteristics (1.1 V @ 200 mA). The cut tape packaging provides flexibility for both automated and manual assembly processes.

Secondary Substitutes (Full Electrical Equivalence):

The 1N5226BTR (Fairchild Semiconductor) and 1N5226B (Microchip Technology) are direct electrical equivalents with identical zener voltage, power rating, and package configuration. Both support the full operating temperature range. The 1N5226BTR offers the highest inventory availability (55,759 pcs). The 1N5226B provides bulk packaging options.

Alternative Substitute (Extended Temperature Range):

The 1N746A BK PBFREE (Central Semiconductor Corp) operates across -65°C to 200°C and provides ROHS3 compliance. Reverse leakage current is reduced to 10 µA @ 1 V, representing improved performance characteristics. This part is suitable for applications requiring extended thermal operating margins.

Compatibility Note for BZX79C3V3-T50A:

The BZX79C3V3-T50A (Fairchild Semiconductor) maintains electrical equivalence with impedance of 95 Ohms, closely matching the TZX3V3A-TAP specification of 100 Ohms. Forward voltage is specified at 100 mA rather than 200 mA. This part is suitable for applications where impedance characteristics are critical.

Compliance Considerations:

For applications requiring ROHS3 compliance, select from: 1N5226B TR PBFREE, 1N746A BK PBFREE, or TZX3V3A-TAP (original part). The 1N5226B (Microchip) is RoHS non-compliant and should be avoided in regulated environments.

Frequently Asked Questions (FAQ)

Q: Can I use 1N5226B as a direct replacement for TZX3V3A-TAP?

A: Yes. The 1N5226B maintains identical zener voltage (3.3 V), power rating (500 mW), and package configuration (DO-35). Both operate across -65°C to 175°C. Impedance is lower (28 Ohms vs. 100 Ohms) and reverse leakage is higher (25 µA vs. 5 µA), but these variations remain within acceptable operational limits for standard zener diode applications.

Q: What is the difference between 1N5226B and 1N5226B TR PBFREE?

A: Both parts are electrically identical 3.3 V, 500 mW zener diodes in DO-35 packaging. The primary differences are: 1N5226B TR PBFREE is ROHS3 compliant and lead-free, operates to 200°C (vs. 175°C), and features lower forward voltage (1.1 V @ 200 mA vs. 1.5 V @ 200 mA). The "TR" designation indicates tape reel packaging; "PBFREE" indicates lead-free construction.

Q: Is the TZX3V3A-TAP automotive-qualified?

A: Yes. The TZX3V3A-TAP carries AEC-Q101 automotive qualification. Among the substitutes, only the TZX3V3A-TAP explicitly lists automotive grade. Applications requiring automotive qualification should retain the original part or verify substitute qualification status with the manufacturer.

Q: Why does BZX79C3V3-T50A have different forward voltage specifications?

A: The BZX79C3V3-T50A specifies forward voltage at 100 mA (1.5 V @ 100 mA) rather than 200 mA. This reflects manufacturer test conditions and does not indicate incompatibility. The part remains suitable for applications where forward voltage characteristics at lower current levels are acceptable.

Q: Can I substitute parts with different impedance values?

A: Yes, within limits. The TZX3V3A-TAP specifies 100 Ohms maximum impedance. Substitutes with lower impedance (28 Ohms) provide improved voltage regulation characteristics. The BZX79C3V3-T50A at 95 Ohms closely matches the original specification. Lower impedance values are generally favorable for voltage regulation applications.

Q: What packaging options are available for these substitutes?

A: All substitutes are available in DO-35 (DO-204AH) through-hole axial configuration. Packaging variants include: Bulk (loose components), Tape & Box (TB), and Cut Tape (CT). Selection depends on assembly process requirements and procurement volume.

Q: Are all substitutes RoHS compliant?

A: No. The 1N5226B (Microchip) is RoHS non-compliant. ROHS3-compliant options include: TZX3V3A-TAP (original), 1N5226B TR PBFREE, and 1N746A BK PBFREE. Verify compliance requirements for your application before part selection.

Q: What is the maximum operating temperature for each substitute?

A: TZX3V3A-TAP and 1N5226B (Microchip) operate to 175°C. All other substitutes (1N5226B TR PBFREE, 1N5226BTR, 1N746A BK PBFREE, BZX79C3V3-T50A) operate to 200°C. Extended temperature range substitutes provide additional thermal margin for high-temperature applications.

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