ZPY3V9-TR Equivalent & Substitute Parts

Part Overview

The ZPY3V9-TR is an automotive-grade Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates at a nominal Zener voltage of 3.9 V with a maximum power dissipation of 1.3 W in a DO-204AL (DO-41) axial through-hole package. The device is AEC-Q101 qualified and ROHS3 compliant, making it suitable for automotive applications requiring voltage regulation and transient protection.

The ZPY3V9-TR is currently in active production status with 791 pieces available in inventory. Substitute parts are necessary when specific packaging formats (tape & reel versus cut tape) are required, when inventory constraints exist, or when alternative sourcing is needed while maintaining electrical and mechanical compatibility.

Substiute Parts

ZPY3V9-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 859ZPY3V9-TR Datasheet

Current PartRFQ

1N4730A-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 215371N4730A-TR Datasheet

DirectRFQ

ZPY3V9-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 25838ZPY3V9-TAP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZPY3V9-TR is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Equivalence Parameters:

• Voltage - Zener (Nominal): 3.9 V
• Tolerance: ±5%
• Power - Maximum: 1.3 W
• Package / Case: DO-204AL (DO-41) Axial
• Mounting Type: Through Hole
• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant

Allowable Variation:

• Impedance (Maximum): Zener diodes with impedance values at or below 4 Ohms are functionally equivalent. The 1N4730A-TR exhibits 9 Ohms impedance, which represents a measurable difference but remains within acceptable substitution parameters for this device category.
• Packaging Format: Tape & Reel (TR) and Cut Tape (CT) are interchangeable packaging configurations of the same component, differing only in presentation method for automated assembly or manual handling.

All substitute parts listed maintain identical electrical specifications for Zener voltage, tolerance, power rating, and thermal operating range. Automotive qualification and RoHS compliance are preserved across all equivalents.

Parameter Comparison

Engineering Selection Recommendations

ZPY3V9-TR (Primary Part): The ZPY3V9-TR is the specified component with Tape & Reel packaging. This format is optimized for high-volume automated assembly processes. The part maintains active production status with AEC-Q101 automotive qualification and ROHS3 compliance. Current inventory of 791 pieces supports immediate procurement for standard applications.

1N4730A-TR (Direct Substitute): The 1N4730A-TR is a direct electrical equivalent with identical Zener voltage, tolerance, power rating, and thermal specifications. This part is manufactured by the same supplier and carries identical automotive qualification. The primary distinction is the impedance specification of 9 Ohms compared to 4 Ohms in the primary part. Both parts are supplied in Tape & Reel format. Inventory availability of 21,441 pieces provides extended supply security. This substitute is suitable for applications where impedance variation within the specified range does not impact circuit performance.

ZPY3V9-TAP (Parametric Equivalent): The ZPY3V9-TAP is a parametric equivalent of the primary part, sharing identical electrical specifications including impedance (4 Ohms), Zener voltage, tolerance, and power rating. The distinction is packaging format: Cut Tape (CT) instead of Tape & Reel (TR). This part is suitable for manual assembly operations or applications requiring individual component handling. Inventory of 25,815 pieces indicates strong availability. Selection of this part is appropriate when Cut Tape packaging is required by assembly processes or when Tape & Reel format is unavailable.

All three parts maintain identical automotive grade classification, AEC-Q101 qualification, and ROHS3 compliance status, ensuring regulatory and quality requirements are met across substitution scenarios.

Frequently Asked Questions (FAQ)

Q: Can the 1N4730A-TR be used as a direct replacement for the ZPY3V9-TR?

A: The 1N4730A-TR is electrically equivalent in Zener voltage (3.9 V), tolerance (±5%), power rating (1.3 W), and thermal operating range (175°C). Both parts are AEC-Q101 qualified and ROHS3 compliant. The impedance specification differs (9 Ohms versus 4 Ohms), which represents a measurable parameter variation. Substitution is valid when circuit design tolerates this impedance difference. Both parts use identical DO-204AL (DO-41) axial through-hole packaging.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel (TR) packaging presents components on a continuous reel suitable for automated pick-and-place assembly equipment. Cut Tape (CT) packaging provides components on tape segments, typically used for manual assembly or lower-volume production. The electrical and mechanical specifications of the component remain identical; only the presentation format differs. Selection depends on assembly process requirements.

Q: Are all three parts suitable for automotive applications?

A: All three parts—ZPY3V9-TR, 1N4730A-TR, and ZPY3V9-TAP—carry automotive grade classification and AEC-Q101 qualification. Each part is ROHS3 compliant and suitable for automotive circuit applications requiring voltage regulation and transient protection at 3.9 V nominal Zener voltage.

Q: What does the impedance specification mean, and why does it differ between parts?

A: Impedance (Zzt) represents the dynamic resistance of the Zener diode at specified operating conditions. The ZPY3V9-TR and ZPY3V9-TAP specify 4 Ohms maximum impedance, while the 1N4730A-TR specifies 9 Ohms maximum impedance. Lower impedance generally indicates better voltage regulation characteristics. The difference is a measurable parameter variation that may affect circuit performance in applications with stringent voltage regulation requirements. Circuit design analysis determines whether the 9 Ohms impedance of the 1N4730A-TR is acceptable for the intended application.

Q: Can these parts be used interchangeably in existing designs?

A: The ZPY3V9-TR and ZPY3V9-TAP are parametrically identical and differ only in packaging format (Tape & Reel versus Cut Tape). These parts are directly interchangeable from an electrical and mechanical standpoint. The 1N4730A-TR is electrically equivalent with the noted impedance difference. Interchangeability depends on whether the circuit design accommodates the impedance variation and whether the packaging format is compatible with assembly processes.

Q: What is the operating temperature range for these Zener diodes?

A: All three parts operate at a maximum junction temperature (TJ) of 175°C. This specification defines the thermal limit for continuous operation. Circuit design must ensure that actual operating temperature remains below this maximum through appropriate thermal management and current limiting.

Q: Are these parts RoHS compliant?

A: All three parts are ROHS3 compliant, meeting the Restriction of Hazardous Substances directive requirements. This compliance status applies to all substitute parts listed.