TZX2V7A-TAP Equivalent & Substitute Parts

Part Overview

The TZX2V7A-TAP is a 2.7 V Zener diode rated for 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component operates across a temperature range of -65°C to 175°C and carries AEC-Q101 automotive qualification. The device is actively produced and available in high inventory quantities. Equivalent and substitute parts are identified for applications requiring alternative sourcing, inventory management, or specific compliance requirements while maintaining functional compatibility within the 2.7 V Zener voltage class and 500 mW power rating.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.7	V
Power - Max	500	mW
Impedance (Max)	100	Ohms
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
Operating Temperature Range	-65°C to 175°C	°C
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of the TZX2V7A-TAP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Zener voltage: 2.7 V nominal
Power rating: 500 mW maximum
Package type: DO-35 (DO-204AH) through-hole axial configuration
Mounting: Through-hole technology

Acceptable Variation Parameters:

Zener voltage tolerance: ±5% is acceptable
Impedance (Zzt): Values up to 100 Ohms maximum
Reverse leakage current: Specified at different voltage conditions
Forward voltage: Variation acceptable within specified test conditions
Operating temperature: Extended ranges are acceptable

Both identified substitute parts meet these criteria and maintain functional compatibility with the original TZX2V7A-TAP specification.

Parameter Comparison

Parameter	TZX2V7A-TAP (Vishay)	BZX79C2V7-T50A (Fairchild)	1N5223B (Taiwan Semiconductor)
Voltage - Zener (Nom)	2.7 V	2.7 V	2.7 V
Tolerance	-	±5%	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	100 Ohms	100 Ohms	30 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 500 mV	75 µA @ 1 V	75 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 100 mA	1.1 V @ 200 mA
Operating Temperature	-65°C to 175°C	-65°C to 200°C	100°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant	Not applicable	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

TZX2V7A-TAP (Primary Part - Vishay General Semiconductor)

Select this part for applications requiring AEC-Q101 automotive qualification and ROHS3 compliance. The Vishay TZX2V7A-TAP carries explicit automotive grade designation and is suitable for regulated automotive environments. This part is actively produced with substantial inventory availability.

BZX79C2V7-T50A (Upgrade Substitute - Fairchild Semiconductor)

This part provides functional equivalence with extended operating temperature range (-65°C to 200°C) compared to the primary part. The BZX79C2V7-T50A maintains identical power rating and impedance specifications. RoHS status is not applicable for this part. Select when extended temperature performance is required and automotive qualification is not mandatory.

1N5223B (Manufacturer Recommended Substitute - Taiwan Semiconductor Corporation)

This part is recommended by the original manufacturer as a direct substitute. The 1N5223B provides superior impedance performance (30 Ohms maximum versus 100 Ohms) and lower forward voltage characteristics. ROHS3 compliance is maintained. Select when improved impedance characteristics benefit circuit performance or when sourcing from Taiwan Semiconductor is preferred. Operating temperature specification differs from primary part.

All three parts share identical 2.7 V Zener voltage, 500 mW power rating, and DO-35 through-hole package configuration, ensuring mechanical and electrical interchangeability within these core parameters.

Frequently Asked Questions (FAQ)

Q: Can the BZX79C2V7-T50A replace the TZX2V7A-TAP in automotive applications?

A: The BZX79C2V7-T50A provides electrical equivalence but does not carry AEC-Q101 automotive qualification. Use only in non-automotive applications or where automotive qualification is not a design requirement.

Q: What is the significance of the impedance difference between the 1N5223B (30 Ohms) and TZX2V7A-TAP (100 Ohms)?

A: Lower impedance in the 1N5223B results in improved voltage regulation and reduced dynamic resistance. This characteristic may provide superior performance in applications sensitive to load transients or requiring tighter voltage regulation.

Q: Are all three parts physically identical in package configuration?

A: Yes. All three parts use the DO-35 (DO-204AH) through-hole axial package. Physical dimensions and PCB mounting are identical, allowing direct board-level substitution.

Q: Which substitute part should be selected for maximum temperature range operation?

A: The BZX79C2V7-T50A operates to 200°C, providing the widest temperature range. The TZX2V7A-TAP operates to 175°C, and the 1N5223B specifies 100°C junction temperature.

Q: Do all parts meet RoHS compliance requirements?

A: The TZX2V7A-TAP and 1N5223B are ROHS3 compliant. The BZX79C2V7-T50A has RoHS status listed as not applicable. Verify RoHS requirements for your specific application before selection.

Q: What is the basis for substitution compatibility between these three parts?

A: Substitution is based on matching Zener voltage (2.7 V nominal), power rating (500 mW), and through-hole DO-35 package configuration. All three parts meet these core electrical and mechanical requirements.

Q: Can the 1N5223B be used as a direct replacement in all applications where the TZX2V7A-TAP is specified?

A: The 1N5223B provides electrical equivalence and is manufacturer-recommended. However, verify operating temperature requirements and any specific compliance certifications required by your application before substitution.

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