TZX2V7B-TAP Equivalent & Substitute Parts

Part Overview

The TZX2V7B-TAP is a 2.7 V Zener diode rated for 500 mW power dissipation in a through-hole DO-35 package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as Active and carries AEC-Q101 automotive qualification. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.7	V
Power - Max	500	mW
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 500 mV
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)	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the TZX2V7B-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 2.7 V nominal
Package type: DO-35 through-hole axial configuration
Mounting: Through-hole compatible
Regulatory compliance: RoHS3 compliant

Secondary Compatibility Factors:

Power rating: 500 mW or higher
Operating temperature range: Must support application requirements
Impedance characteristics: Maximum 100 Ohms acceptable
Reverse leakage current: Application-dependent tolerance

Substitute parts are grouped into two categories based on power rating:

Category A (500 mW Rating): 1N5223B - Direct power rating match with identical 2.7 V specification and DO-35 package.

Category B (400 mW Rating): BZX79-B2V7,113 | BZX79-B2V7,133 | BZX79-B2V7,143 | BZX79-C2V7,143 - Reduced power rating with extended temperature range and improved impedance characteristics. Suitable for applications where 400 mW dissipation capacity is sufficient.

Parameter Comparison

Parameter	TZX2V7B-TAP	1N5223B	BZX79-B2V7,113	BZX79-B2V7,133	BZX79-B2V7,143	BZX79-C2V7,143
Manufacturer	Vishay	Taiwan Semiconductor	NXP USA Inc.	Nexperia USA Inc.	NXP Semiconductors	Nexperia USA Inc.
Voltage - Zener (Nom)	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V
Tolerance	-	±5%	±2%	±2%	±2%	±5%
Power - Max	500 mW	500 mW	400 mW	400 mW	400 mW	400 mW
Impedance (Max)	100 Ohms	30 Ohms	100 Ohms	100 Ohms	100 Ohms	100 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 500 mV	75 µA @ 1 V	20 µA @ 1 V	20 µA @ 1 V	20 µA @ 1 V	20 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.1 V @ 200 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65 to 175°C	100°C (TJ)	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 200°C
Package / Case	DO-204AH (DO-35)	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	Not specified	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (500 mW Requirement):

The 1N5223B from Taiwan Semiconductor Corporation is the only substitute maintaining the 500 mW power rating. This part is Active status and RoHS3 compliant. The 1N5223B exhibits lower impedance (30 Ohms versus 100 Ohms) and improved forward voltage characteristics. However, the operating temperature specification is limited to 100°C junction temperature, which differs from the TZX2V7B-TAP's -65 to 175°C range. Selection of 1N5223B is appropriate for applications where the 100°C thermal limit is acceptable.

For Reduced Power Applications (400 mW Acceptable):

The BZX79 series (B2V7 and C2V7 variants) from NXP and Nexperia provide 400 mW rated alternatives with extended operating temperature ranges (-65 to 200°C). All BZX79 variants maintain the 2.7 V nominal zener voltage and DO-35 package compatibility. The B-series variants carry ±2% tolerance, while the C-series carries ±5% tolerance. These parts are Active status and RoHS3 compliant where specified. Selection from this group is appropriate for applications where power dissipation does not exceed 400 mW and extended temperature operation is beneficial.

Compliance Considerations:

All identified substitutes maintain RoHS3 compliance and Active product status. The TZX2V7B-TAP carries AEC-Q101 automotive qualification; substitute parts do not explicitly list this qualification in provided specifications. Applications requiring automotive qualification should confirm AEC-Q101 status with manufacturers before implementation.

Frequently Asked Questions (FAQ)

Q: Can the 1N5223B directly replace the TZX2V7B-TAP in all applications?

A: The 1N5223B is electrically compatible at the 2.7 V zener voltage and 500 mW power rating. However, the operating temperature specification differs. The 1N5223B is rated to 100°C junction temperature, while the TZX2V7B-TAP operates from -65 to 175°C. Substitution is valid only when the application's thermal environment remains within the 1N5223B's limits.

Q: What is the difference between BZX79-B2V7 and BZX79-C2V7 variants?

A: Both series maintain identical 2.7 V zener voltage, 400 mW power rating, and DO-35 package configuration. The primary difference is tolerance specification: B-series carries ±2% tolerance, while C-series carries ±5% tolerance. Both operate across -65 to 200°C temperature range. Selection depends on circuit tolerance requirements.

Q: Why do the BZX79 series parts have lower power ratings (400 mW) than the TZX2V7B-TAP (500 mW)?

A: The BZX79 series represents a different product line with different thermal and electrical characteristics. The 400 mW rating is a design specification for these parts. Substitution with 400 mW parts is valid only when circuit power dissipation requirements do not exceed 400 mW.

Q: Are all substitute parts RoHS3 compliant?

A: The 1N5223B, BZX79-B2V7,133, BZX79-C2V7,143, and TZX2V7B-TAP are explicitly specified as RoHS3 compliant. BZX79-B2V7,113 and BZX79-B2V7,143 do not have RoHS status specified in provided data. Confirmation of RoHS compliance should be obtained from manufacturers for these parts if regulatory compliance is required.

Q: Can BZX79 series parts be used in automotive applications requiring AEC-Q101 qualification?

A: The TZX2V7B-TAP carries AEC-Q101 automotive qualification. The BZX79 series parts do not list AEC-Q101 qualification in provided specifications. Applications requiring automotive qualification must verify qualification status with manufacturers before implementation.

Q: What is the significance of the different impedance values (30 Ohms for 1N5223B versus 100 Ohms for others)?

A: Impedance affects the zener diode's dynamic response and voltage regulation characteristics. The 1N5223B's lower impedance (30 Ohms) provides better voltage regulation under load changes. The higher impedance (100 Ohms) of other substitutes may result in slightly different transient response. Circuit performance should be evaluated if impedance differences are critical to application function.

Q: What packaging options are available for these substitute parts?

A: All identified substitutes are available in DO-35 through-hole axial package configuration, matching the TZX2V7B-TAP. Packaging variants (Tape & Box, Bulk, Cut Tape) affect supply and handling but do not alter electrical or mechanical compatibility for circuit implementation.

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