ZMY33-GS18 Equivalent & Substitute Parts

Part Overview

The ZMY33-GS18 is a 33 V, 1 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-213AB (MELF) surface mount packaging. This component is supplied in Cut Tape (CT) format and is classified as an active product with AEC-Q101 automotive qualification. The ZMY33-GS18 serves voltage regulation and transient protection applications requiring precise 33 V reference characteristics. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set.

Substiute Parts

ZMY33-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 4048ZMY33-GS18 Datasheet

Current PartRFQ

ZM4752A-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 28403ZM4752A-GS18 Datasheet

DirectRFQ

ZMY33-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 2863ZMY33-GS08 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ZMY33-GS18 are qualified based on the following criteria:

Electrical Equivalence Requirements:

• Voltage - Zener (Nominal): 33 V
• Tolerance: ±5%
• Power - Maximum: 1 W
• Operating Temperature: 175°C
• Package / Case: DO-213AB, MELF (Glass)
• Mounting Type: Surface Mount
• Grade: Automotive
• Qualification: AEC-Q101

Allowable Parameter Variations:

• Impedance (Maximum): Zener diodes in this category exhibit impedance values that may vary within the DO-213AB package specification. Values of 20 Ohms and 45 Ohms are both acceptable for this application class.
• Current - Reverse Leakage @ Vr: Leakage current values of 500 nA @ 25 V and 5 µA @ 25.1 V are both within acceptable limits for automotive-grade Zener diodes.
• Packaging Format: Cut Tape (CT) and Tape & Reel (TR) are both surface mount delivery formats and do not affect electrical performance.

Identified Substitutes:

1. ZM4752A-GS18 (Direct manufacturer equivalent, Tape & Reel format)
2. ZMY33-GS08 (Parametric equivalent, Cut Tape format)

Parameter Comparison

Engineering Selection Recommendations

ZM4752A-GS18 Substitution: The ZM4752A-GS18 is a direct manufacturer equivalent with identical electrical specifications (33 V, 1 W, ±5% tolerance) and full AEC-Q101 automotive qualification. The primary difference is packaging format (Tape & Reel vs. Cut Tape) and impedance specification (45 Ohms vs. 20 Ohms). Both impedance values are within acceptable limits for automotive Zener diode applications. This part is suitable for direct substitution in production environments where Tape & Reel format is preferred for automated assembly. Inventory availability is significantly higher (28,300 pcs vs. 4,018 pcs).

ZMY33-GS08 Substitution: The ZMY33-GS08 is a parametric equivalent with identical electrical performance (33 V, 1 W, ±5% tolerance, 20 Ohms impedance, 500 nA leakage) and matching AEC-Q101 automotive qualification. Both parts share the same base product number (ZMY33) and Cut Tape packaging format. This part is suitable for direct substitution where Cut Tape format is required. Inventory availability is lower (2,800 pcs).

Compliance Status: All three parts maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status. Selection between substitutes should be based on packaging format requirements and inventory availability rather than electrical performance.

Frequently Asked Questions (FAQ)

Q: Can ZM4752A-GS18 replace ZMY33-GS18 in automotive applications? A: Yes. Both parts are AEC-Q101 qualified automotive-grade Zener diodes with identical 33 V nominal voltage, 1 W power rating, and ±5% tolerance. The difference in impedance (45 Ohms vs. 20 Ohms) and packaging format (Tape & Reel vs. Cut Tape) does not affect electrical compatibility for voltage regulation and transient protection functions.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Cut Tape (CT) is supplied in individual segments suitable for manual or semi-automated assembly. Tape & Reel (TR) is supplied on continuous reels optimized for high-speed automated pick-and-place equipment. Both formats contain the same component in DO-213AB surface mount package. Selection depends on assembly process requirements.

Q: Are there differences in reverse leakage current between the substitutes? A: Yes. ZMY33-GS18 and ZMY33-GS08 specify 500 nA @ 25 V, while ZM4752A-GS18 specifies 5 µA @ 25.1 V. Both values are within acceptable limits for automotive-grade Zener diodes. The higher leakage in ZM4752A-GS18 does not compromise performance in standard voltage regulation applications.

Q: Do all three parts have the same moisture sensitivity rating? A: Yes. All three parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage or handling.

Q: Can these parts be used interchangeably on the same PCB assembly? A: Yes, provided the assembly process accommodates the selected packaging format. ZMY33-GS18 and ZMY33-GS08 (both Cut Tape) are directly interchangeable. ZM4752A-GS18 (Tape & Reel) requires compatible automated assembly equipment but is electrically equivalent.