Equivalent & Substitute Parts for ZMY56-GS18 Zener Diode

Part Overview

The ZMY56-GS18 is an automotive-grade Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at a nominal Zener voltage of 56 V with 1 W maximum power dissipation in a DO-213AB (MELF glass) package. The device is AEC-Q101 qualified and ROHS3 compliant, making it suitable for automotive and industrial applications requiring voltage regulation and transient protection.

The ZMY56-GS18 is classified as an active product with full manufacturing support. Identifying equivalent substitute parts becomes necessary when the primary part experiences supply constraints, extended lead times, or inventory limitations while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	56	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	100	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 42 V	nA
Operating Temperature	175	°C
Package / Case	DO-213AB, MELF (Glass)	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the ZMY56-GS18 is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

Electrical Parameters (Must Match Exactly):

Zener voltage: 56 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance: 100 Ohms
Reverse leakage current: 500 nA @ 42 V
Operating temperature rating: 175°C

Mechanical & Compliance Parameters (Must Match Exactly):

Package type: DO-213AB, MELF (Glass)
Mounting type: Surface Mount
Automotive grade classification
AEC-Q101 qualification
ROHS3 compliance
Moisture Sensitivity Level: 1

Substitute parts must demonstrate identical specifications across all listed parameters. No parameter relaxation or tolerance expansion is permitted for substitution validity.

Parameter Comparison

Parameter	ZMY56-GS18	ZMY56-GS08	Match Status
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Identical
Category	Diodes, Zener	Diodes, Zener	Identical
Voltage - Zener (Nom)	56 V	56 V	Identical
Tolerance	±5%	±5%	Identical
Power - Max	1 W	1 W	Identical
Impedance (Max)	100 Ohms	100 Ohms	Identical
Current - Reverse Leakage @ Vr	500 nA @ 42 V	500 nA @ 42 V	Identical
Operating Temperature	175°C	175°C	Identical
Grade	Automotive	Automotive	Identical
Qualification	AEC-Q101	AEC-Q101	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Active	Active	Identical

Engineering Selection Recommendations

The ZMY56-GS08 is a direct parametric equivalent to the ZMY56-GS18. Both components share identical electrical specifications, mechanical packaging, and compliance certifications. Selection between these parts is based on availability and inventory status rather than technical performance differences.

Selection Criteria:

Availability: The ZMY56-GS08 maintains higher inventory levels (13,091 pcs) compared to the ZMY56-GS18 (924 pcs), making it the preferred choice for applications with extended procurement timelines or high-volume requirements.
Compliance Assurance: Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance, ensuring suitability for regulated automotive and industrial environments.
Functional Interchangeability: No circuit redesign, PCB layout modification, or application re-qualification is required when substituting between these parts. Direct replacement is valid at the component level.
Manufacturing Continuity: Both parts are manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) under the same base product number (ZMY56), ensuring consistent quality and performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can ZMY56-GS08 be used as a direct replacement for ZMY56-GS18 without circuit modification?

A: Yes. The ZMY56-GS08 is electrically and mechanically identical to the ZMY56-GS18 across all specified parameters. Direct substitution requires no circuit redesign or PCB layout changes.

Q: Are there any differences in automotive qualification between these parts?

A: No. Both the ZMY56-GS18 and ZMY56-GS08 carry identical AEC-Q101 qualification and automotive grade classification. They meet the same regulatory and performance standards for automotive applications.

Q: Do these parts require different handling or storage procedures?

A: No. Both parts share identical Moisture Sensitivity Level (MSL 1 - Unlimited), indicating no special moisture control measures are required during storage or handling.

Q: What is the significance of the different part number suffixes (GS18 vs. GS08)?

A: The suffix designates the manufacturing date code or production batch identifier. The electrical and mechanical specifications remain identical regardless of suffix variation.

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

A: Yes. The identical DO-213AB surface mount package and electrical characteristics ensure pin-for-pin and functional compatibility with existing PCB designs.

Q: Are there any lead time advantages to selecting one part over the other?

A: The ZMY56-GS08 maintains significantly higher inventory availability (13,091 pcs versus 924 pcs), potentially offering shorter procurement lead times for high-volume orders.

Q: Do both parts comply with ROHS3 requirements?

A: Yes. Both the ZMY56-GS18 and ZMY56-GS08 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

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