ZPY8V2-TAP Zener Diode Equivalent & Substitute Parts

Part Overview

The ZPY8V2-TAP is an 8.2 V, 1.3 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-204AL (DO-41) axial through-hole package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same voltage rating, tolerance, package type, and mounting configuration. Alternative models may be required due to inventory availability, packaging format preferences, or supply chain optimization.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	8.2	V
Tolerance	±5%	%
Power - Max	1.3	W
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Operating Temperature	175	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the ZPY8V2-TAP is based on the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 8.2 V (fixed requirement)
Tolerance: ±5% (fixed requirement)
Package / Case: DO-204AL, DO-41, Axial (mechanical compatibility requirement)
Mounting Type: Through Hole (assembly compatibility requirement)

Compliance & Qualification Criteria:

Grade: Automotive
Qualification: AEC-Q101
RoHS Status: ROHS3 Compliant

Power Rating Consideration: The ZPY8V2-TAP specifies 1.3 W maximum power dissipation. Substitute parts with 1.0 W or 1.3 W ratings are functionally equivalent in applications where the circuit design accommodates the specified power rating. The 1N4738A series (1.3 W variants) provides direct electrical equivalence. The 1N4738A-T50A, 1N4738A-T50R, and 1N4738ATR (1.0 W variants) are acceptable substitutes where power dissipation requirements do not exceed 1.0 W.

Packaging Format Variations: Substitute parts are grouped by packaging format: Tape & Box (TB), Cut Tape (CT), and Bulk. These represent different supply and delivery configurations of the same electrical component and do not affect functional performance.

Parameter Comparison

Parameter	ZPY8V2-TAP (Vishay)	1N4738A-TAP (Vishay)	1N4738A-TR (Vishay)	1N4738A-T50A (onsemi)	1N4738A-T50R (Fairchild)	1N4738ATR (Fairchild)
Voltage - Zener (Nom)	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V
Tolerance	±5%	±5%	±5%	±5%	±5%	±5%
Power - Max	1.3 W	1.3 W	1.3 W	1.0 W	1.0 W	1.0 W
Impedance (Max)	1 Ohm	4.5 Ohms	4.5 Ohms	4.5 Ohms	4.5 Ohms	4.5 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 6 V	10 µA @ 6 V	10 µA @ 6 V	10 µA @ 6 V	10 µA @ 6 V	10 µA @ 6 V
Operating Temperature	175°C	175°C (TJ)	175°C (TJ)	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Grade	Automotive	Automotive	Automotive	Automotive	—	—
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101	—	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	—
Packaging Format	Tape & Box (TB)	Cut Tape (CT)	Cut Tape (CT)	Tape & Box (TB)	Bulk	Bulk

Engineering Selection Recommendations

Primary Substitutes (Vishay 1N4738A Series): The 1N4738A-TAP and 1N4738A-TR are direct electrical equivalents to the ZPY8V2-TAP. Both maintain 8.2 V nominal voltage, ±5% tolerance, 1.3 W power rating, DO-41 package, through-hole mounting, and AEC-Q101 automotive qualification with ROHS3 compliance. Selection between these variants depends on packaging format requirement: 1N4738A-TAP is supplied in Cut Tape format, while 1N4738A-TR is also supplied in Cut Tape format. Both are Active product status.

Secondary Substitutes (onsemi and Fairchild 1N4738A Series): The 1N4738A-T50A (onsemi), 1N4738A-T50R (Fairchild), and 1N4738ATR (Fairchild) are functionally equivalent with the following considerations:

All three maintain 8.2 V nominal voltage and ±5% tolerance
Power rating is 1.0 W (versus 1.3 W for primary substitutes)
All maintain DO-41 axial through-hole package configuration
Operating temperature range extends to -65°C ~ 200°C (versus 175°C maximum for Vishay variants)
1N4738A-T50A and 1N4738A-T50R do not list automotive grade or AEC-Q101 qualification in provided specifications
1N4738ATR does not list automotive grade or AEC-Q101 qualification in provided specifications

Selection of secondary substitutes is appropriate where circuit design accommodates 1.0 W maximum power dissipation and automotive qualification is not a design requirement.

Frequently Asked Questions (FAQ)

Q: Can 1N4738A-TAP directly replace ZPY8V2-TAP in automotive applications?

A: Yes. Both components share identical 8.2 V nominal voltage, ±5% tolerance, 1.3 W power rating, DO-41 axial through-hole package, and AEC-Q101 automotive qualification. The primary difference is packaging format (Cut Tape versus Tape & Box), which does not affect electrical performance or circuit compatibility.

Q: What is the difference between 1.3 W and 1.0 W power-rated variants?

A: Power rating indicates maximum continuous power dissipation capability. The ZPY8V2-TAP and 1N4738A-TAP/1N4738A-TR are rated for 1.3 W. The 1N4738A-T50A, 1N4738A-T50R, and 1N4738ATR are rated for 1.0 W. Substitution with 1.0 W variants is acceptable only when circuit design ensures power dissipation does not exceed 1.0 W. Exceeding the rated power dissipation may result in component failure or degraded performance.

Q: Are Fairchild 1N4738A-T50R and 1N4738ATR suitable for automotive applications?

A: The provided specifications for Fairchild variants do not include automotive grade designation or AEC-Q101 qualification. Use of these components in automotive applications requires verification against specific design requirements and qualification standards. Vishay and onsemi variants explicitly list automotive grade and AEC-Q101 qualification.

Q: What does the packaging format designation mean (TB, CT, Bulk)?

A: Packaging format indicates the supply and delivery configuration: Tape & Box (TB) is supplied on tape in a box; Cut Tape (CT) is supplied on cut tape segments; Bulk is supplied loose. These formats do not affect electrical performance or component functionality. Selection depends on assembly process requirements and inventory management preferences.

Q: Can I substitute a 1.0 W variant for a 1.3 W component in an existing design?

A: Substitution is permissible only if circuit analysis confirms that actual power dissipation in the application does not exceed 1.0 W. If the original design relies on 1.3 W capability, substitution with 1.0 W variants is not appropriate without circuit redesign or thermal management modifications.

Q: Are all listed substitutes ROHS3 compliant?

A: Vishay 1N4738A-TAP, 1N4738A-TR, and onsemi 1N4738A-T50A are explicitly listed as ROHS3 compliant. Fairchild 1N4738A-T50R and 1N4738ATR do not include RoHS status in the provided specifications. Verification of RoHS compliance status is required for these variants if regulatory compliance is a design requirement.

Q: What is the significance of impedance (Zzt) variation between parts?

A: Impedance (Zzt) is a dynamic parameter affecting zener diode response characteristics. The ZPY8V2-TAP specifies 1 Ohm maximum impedance, while all 1N4738A variants specify 4.5 Ohms maximum impedance. This difference may affect circuit performance in applications with stringent impedance requirements. Substitution with higher impedance variants requires circuit analysis to confirm acceptable performance.

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