TZX9V1A-TAP Equivalent & Substitute Parts

Part Overview

The TZX9V1A-TAP is a 9.1 V, 500 mW Zener diode 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 actively produced and maintains ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances. Alternative sources provide equivalent zener voltage regulation, power dissipation capability, and package form factors suitable for direct circuit replacement.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	9.1	V
Power - Maximum	500	mW
Impedance (Maximum)	20	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 6.8 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH (DO-35)	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution eligibility for the TZX9V1A-TAP is determined by the following critical parameters:

Primary Electrical Criteria:

Zener voltage nominal value: 9.1 V
Maximum power dissipation: 500 mW minimum
Operating temperature range: -65°C minimum to 175°C minimum
Mounting configuration: Through-hole axial package (DO-35 / DO-204AH)

Secondary Compatibility Factors:

Impedance characteristics (Zzt)
Reverse leakage current specifications
Forward voltage drop characteristics
RoHS and REACH compliance status

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (Identical Zener Voltage & Power Rating): Parts maintaining 9.1 V nominal zener voltage with 500 mW power rating and through-hole DO-35 packaging. These components provide pin-for-pin and functional equivalence.

Category B - Functional Alternatives (Voltage Tolerance Consideration): Parts with zener voltage specifications within acceptable circuit tolerance bands. The 1N4102 operates at 8.7 V nominal, representing a 4.4% deviation from the 9.1 V specification. This part is included based on manufacturer cross-reference data but requires circuit-level voltage tolerance verification.

Parameter Comparison

Parameter	TZX9V1A-TAP (Vishay)	BZX79C9V1 (Taiwan Semiconductor)	BZX79C9V1-T50A (onsemi)	1N4102 (Microchip)
Voltage - Zener (Nom)	9.1 V	9.1 V	9.1 V	8.7 V
Tolerance	—	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	400 mW
Impedance (Max)	20 Ohms	15 Ohms	15 Ohms	200 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 6.8 V	500 nA @ 6 V	500 nA @ 6 V	1 µA @ 6.61 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 100 mA	1.5 V @ 100 mA	1 V @ 200 mA
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 200°C	-65 to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Surface Mount
Package / Case	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-213AA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

BZX79C9V1 (Taiwan Semiconductor Corporation) and BZX79C9V1-T50A (onsemi)

These components provide direct electrical and mechanical equivalence to the TZX9V1A-TAP. Both maintain the 9.1 V nominal zener voltage, 500 mW power rating, and through-hole DO-35 package configuration. The BZX79C9V1-T50A extends the upper operating temperature to 200°C, providing enhanced thermal margin compared to the 175°C specification of the original part. Both substitute parts maintain ROHS3 compliance and REACH unaffected status. The BZX79C9V1 is available in tape and reel packaging with 25,300 units in stock, while the BZX79C9V1-T50A is supplied in cut tape format with 15,771 units in stock.

1N4102 (Microchip Technology)

This component operates at 8.7 V nominal zener voltage, representing a 4.4% deviation from the 9.1 V specification. The 1N4102 is supplied in surface-mount DO-213AA packaging, which is mechanically incompatible with through-hole circuit board layouts. The maximum power rating is 400 mW, below the 500 mW requirement. This part is listed as a manufacturer cross-reference but does not satisfy the mounting type or power dissipation requirements for direct substitution in through-hole applications.

Recommendation Summary

For direct replacement in through-hole circuits requiring 9.1 V, 500 mW zener regulation, select either BZX79C9V1 or BZX79C9V1-T50A. Both parts satisfy all electrical and mechanical compatibility criteria. The BZX79C9V1-T50A provides extended temperature operation to 200°C. The 1N4102 is not suitable for this application due to package incompatibility and reduced power rating.

Frequently Asked Questions (FAQ)

Q: Can the 1N4102 be used as a substitute for the TZX9V1A-TAP?

A: No. The 1N4102 is supplied in surface-mount DO-213AA packaging, which is mechanically incompatible with through-hole circuit board designs. Additionally, the 1N4102 maximum power rating of 400 mW is below the 500 mW specification. The zener voltage of 8.7 V also deviates 4.4% from the required 9.1 V specification.

Q: What is the difference between BZX79C9V1 and BZX79C9V1-T50A?

A: Both parts maintain identical electrical specifications: 9.1 V nominal zener voltage, 500 mW power rating, and DO-35 through-hole packaging. The BZX79C9V1-T50A extends the maximum operating temperature to 200°C, compared to 175°C for the BZX79C9V1. The BZX79C9V1-T50A is supplied in cut tape packaging, while the BZX79C9V1 is available in tape and reel format.

Q: Are the substitute parts automotive qualified?

A: The TZX9V1A-TAP carries AEC-Q101 automotive qualification. The BZX79C9V1 and BZX79C9V1-T50A do not list automotive qualification in their specifications. Both substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory compliance of the original part.

Q: What is the impedance difference between the main part and substitutes?

A: The TZX9V1A-TAP specifies a maximum impedance of 20 Ohms. The BZX79C9V1 and BZX79C9V1-T50A both specify 15 Ohms maximum impedance, representing lower dynamic impedance. The 1N4102 specifies 200 Ohms maximum impedance, significantly higher than the original specification.

Q: Can these parts be used interchangeably in existing circuit boards?

A: The BZX79C9V1 and BZX79C9V1-T50A are pin-compatible with the TZX9V1A-TAP in through-hole applications. Both maintain identical lead spacing and axial package geometry. The 1N4102 cannot be used in existing through-hole designs due to its surface-mount package configuration.

Q: What is the reverse leakage current specification?

A: The TZX9V1A-TAP specifies 1 µA maximum reverse leakage at 6.8 V. The BZX79C9V1 and BZX79C9V1-T50A specify 500 nA maximum reverse leakage at 6 V, representing lower leakage characteristics. The 1N4102 specifies 1 µA maximum reverse leakage at 6.61 V, matching the original specification.

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