Equivalent & Substitute Parts for ZPY56-TAP Zener Diode

Part Overview

The ZPY56-TAP is a 56 V, 1.3 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division, packaged in DO-204AL (DO-41) axial through-hole configuration. This component is classified as Active and carries AEC-Q101 automotive qualification. The part is supplied in Tape & Box (TB) packaging with 792 units currently in stock.

Equivalent and substitute parts are identified based on matching electrical specifications: nominal Zener voltage of 56 V at ±5% tolerance, through-hole axial mounting, and automotive-grade qualification. Substitute parts may vary in maximum power dissipation, impedance characteristics, and packaging format while maintaining functional compatibility within the specified voltage and tolerance parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	56	V
Tolerance	±5	%
Power - Max	1.3	W
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature	175	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the ZPY56-TAP are qualified based on the following criteria:

Primary Matching Parameters:

Nominal Zener voltage: 56 V
Voltage tolerance: ±5%
Mounting type: Through Hole
Package type: DO-204AL / DO-41 axial configuration
Automotive grade classification
AEC-Q101 qualification status

Secondary Variation Parameters: Substitute parts may differ in the following characteristics while remaining functionally compatible:

Maximum power dissipation (1.0 W to 1.3 W range)
Impedance (Zzt) maximum values (50 Ohms to 110 Ohms)
Reverse leakage current specifications
Packaging format (Tape & Box vs. Cut Tape)
Supplier device package designation

All identified substitutes maintain the core electrical function of voltage regulation at 56 V nominal with ±5% tolerance and are suitable for through-hole PCB assembly in automotive applications.

Parameter Comparison

Parameter	ZPY56-TAP (Main)	1N4758A-TAP	1N4758A (SMC)	1N4758A-T50A (onsemi)
Manufacturer	Vishay	Vishay	SMC Diode Solutions	onsemi
Voltage - Zener (Nom)	56 V	56 V	56 V	56 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1.3 W	1.3 W	1 W	1 W
Impedance (Max)	50 Ohms	110 Ohms	110 Ohms	110 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 42 V	5 µA @ 42.6 V	5 µA @ 42.6 V	5 µA @ 42.6 V
Operating Temperature	175°C	175°C	200°C	-65°C ~ 200°C
Grade	Automotive	Automotive	—	—
Qualification	AEC-Q101	AEC-Q101	—	—
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41	DO-204AL, DO-41	DO-204AL, DO-41	DO-204AL, DO-41
Packaging Format	Tape & Box	Cut Tape	—	Cut Tape
Product Status	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: 1N4758A-TAP (Vishay)

The 1N4758A-TAP is the direct equivalent substitute for the ZPY56-TAP. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications: 56 V nominal Zener voltage, ±5% tolerance, 1.3 W maximum power dissipation, and AEC-Q101 automotive qualification. The primary difference is packaging format: 1N4758A-TAP is supplied in Cut Tape (CT) format versus Tape & Box (TB) for the ZPY56-TAP. Both maintain ROHS3 compliance and are classified as Active products. This substitute is suitable for direct replacement in automotive applications.

Secondary Substitute: 1N4758A-T50A (onsemi)

The 1N4758A-T50A from onsemi maintains the 56 V nominal Zener voltage and ±5% tolerance specification. This part is rated for 1 W maximum power dissipation (versus 1.3 W for the main part) and carries an extended operating temperature range of -65°C to 200°C. The part is Active, ROHS3 compliant, and supplied in Cut Tape format. Selection of this substitute is appropriate for applications where the 1 W power rating is sufficient and extended temperature range is beneficial.

Tertiary Substitute: 1N4758A (SMC Diode Solutions)

The 1N4758A from SMC Diode Solutions matches the 56 V nominal voltage and ±5% tolerance. This part is rated for 1 W maximum power dissipation and operates to 200°C. However, this part is classified as Obsolete and lacks documented AEC-Q101 qualification. Use of this substitute is not recommended for new automotive designs or applications requiring active product status and automotive qualification.

Selection Criteria Summary:

For applications requiring active product status and automotive qualification, select either 1N4758A-TAP (Vishay) or 1N4758A-T50A (onsemi). The Vishay 1N4758A-TAP is preferred when 1.3 W power dissipation is required. The onsemi 1N4758A-T50A is suitable when 1 W power dissipation is adequate and extended temperature range is advantageous. Avoid the SMC Diode Solutions 1N4758A due to obsolete status.

Frequently Asked Questions (FAQ)

Q: Can the 1N4758A-TAP replace the ZPY56-TAP in all applications?

A: Yes. Both parts share identical electrical specifications (56 V nominal, ±5% tolerance, 1.3 W power, AEC-Q101 qualification) and identical package type (DO-204AL / DO-41 axial). The only difference is packaging format (Cut Tape vs. Tape & Box), which does not affect electrical performance or PCB assembly compatibility.

Q: What is the difference between the 1N4758A-TAP and 1N4758A-T50A?

A: Both parts maintain 56 V nominal voltage and ±5% tolerance. The 1N4758A-TAP (Vishay) is rated for 1.3 W maximum power dissipation and 175°C operating temperature. The 1N4758A-T50A (onsemi) is rated for 1 W maximum power dissipation but offers an extended operating temperature range of -65°C to 200°C. Selection depends on power dissipation requirements and temperature operating range.

Q: Why is the SMC Diode Solutions 1N4758A not recommended?

A: The SMC Diode Solutions 1N4758A is classified as Obsolete and does not carry documented AEC-Q101 automotive qualification. For new designs and applications requiring active product status and automotive compliance, this part should not be selected.

Q: Are all substitute parts ROHS3 compliant?

A: The Vishay 1N4758A-TAP and onsemi 1N4758A-T50A are both ROHS3 compliant. The SMC Diode Solutions 1N4758A does not have documented RoHS status in the provided specifications.

Q: Does packaging format (Tape & Box vs. Cut Tape) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly logistics. Electrical performance and functional characteristics remain identical regardless of whether the part is supplied in Tape & Box or Cut Tape format.

Q: Can the 1 W rated substitutes replace the 1.3 W rated main part?

A: Substitution is possible only if the application circuit dissipates 1 W or less in the Zener diode. If the circuit design requires 1.3 W dissipation capability, the 1 W rated parts (1N4758A from SMC and 1N4758A-T50A from onsemi) are not suitable. The Vishay 1N4758A-TAP maintains the full 1.3 W rating and is the appropriate choice for such applications.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. It certifies that the component meets reliability, quality, and performance requirements for automotive applications. Parts carrying AEC-Q101 qualification are suitable for use in automotive-grade designs.

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